ZMS Cable & Accessories

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Difference Between Wire, Cable, Conductor, and Other Terminologies Basics

Wire, cable, conductor, and related terminologies are often used interchangeably in everyday language, leading to confusion among individuals who are not well-versed in electrical engineering or related fields. However, understanding the differences between these terms is essential for anyone dealing with electrical systems, whether in a professional capacity or for personal use.

What is a Wire?

A wire can be defined as a single, flexible metallic strand or rod that is used to transmit electrical current or signals. Wires are typically composed of conductive materials such as copper or aluminum due to their excellent electrical conductivity properties. They come in various gauges, with thinner wires suitable for low-current applications and thicker wires capable of handling higher currents. The primary purpose of a wire is to establish an electrical connection between two or more points in an electrical circuit.

Different types of wires are available to cater to specific applications. For instance, solid wires consist of a single, solid conductor and are commonly used for in-wall electrical wiring. Stranded wires, on the other hand, are made up of multiple smaller strands twisted or braided together, providing flexibility and resistance to fatigue. They are often used for applications that require frequent bending or movement, such as cables for portable devices or automotive wiring.

What is a Cable?

In contrast to wires, cables are composed of multiple wires or conductors bundled together within a protective outer covering. The primary function of a cable is to transmit electrical signals or power from one point to another. Cables offer better protection against external factors like moisture, abrasion, and electromagnetic interference due to their outer sheath or jacket.

Difference between Wire and Cable

The main difference between wires and cables lies in their structure, functionality, and applications. Wires, as mentioned earlier, are single, flexible metallic strands used to transmit electrical current or signals. They are primarily used for establishing electrical connections in circuits. On the other hand, cables are composed of multiple wires or conductors bundled together within a protective outer covering.

The bundled configuration of cables offers several advantages over individual wires. Cables provide better organization and management of multiple wires, reducing the risk of tangling and making installation and maintenance easier. Additionally, the outer sheath or jacket of a cable provides protection against environmental factors, ensuring durability and longevity.

Cables are commonly used for longer-distance electrical transmission, where the bundled conductors help in reducing signal interference and loss. They are extensively employed in industries such as telecommunications, data networking, power distribution, and audio-visual systems. In contrast, individual wires are typically utilized for shorter distances and localized electrical connections.

Furthermore, cables can be specialized to serve specific purposes. For instance, coaxial cables consist of a central conductor surrounded by insulating layers and a metallic shield, designed to transmit high-frequency signals with minimal interference. Ethernet cables, commonly known as network cables, are used for data transmission in computer networks. These cables have multiple twisted pairs of conductors, allowing for reliable and high-speed data communication.

Other Related Terminologies

In addition to wires and cables, it's crucial to understand other related terminologies that contribute to the overall structure and functionality of electrical systems. Here are a few essential terms:

Insulator: An insulator is a non-conductive material used to prevent the flow of electrical current between conductors. Insulators are crucial for maintaining proper insulation and reducing the risk of electrical shock or short circuits.

Sheath or Jacket: The sheath or jacket of a cable is the protective outer covering that surrounds the bundled conductors. It provides mechanical protection, resistance to abrasion, and insulation against external elements.

Core: The core refers to the central part of a cable that contains the bundled conductors. It acts as the foundation and provides structural integrity to the cable.

Understanding these additional terminologies helps in comprehending the overall composition and function of wires and cables.

Factors to Consider in Wire and Cable Selection

When selecting wires or cables for specific applications, several factors need to be considered to ensure optimal performance and safety. These factors include:

Voltage: The voltage level of the electrical system determines the type of wire or cable suitable for the application. Higher voltage systems require cables with appropriate insulation and conductor properties to handle the increased electrical stress.

Current Capacity: The current-carrying capacity of wires and cables is determined by their gauge or thickness. Adequate sizing is crucial to prevent overheating and potential damage to the conductors.

Insulation: The insulation material used in wires and cables plays a vital role in maintaining electrical separation and preventing short circuits. Different insulation materials have varying resistance to heat, moisture, and chemicals.

Environmental Factors: The operating environment, including temperature, moisture, chemicals, and mechanical stress, must be considered when selecting wires or cables. Specialized cables designed for harsh environments may be necessary to ensure reliable performance.

By carefully evaluating these factors, one can choose the appropriate wire or cable that meets the requirements of the specific application.

Importance of Proper Wiring and Cabling

Proper installation and maintenance of wiring and cabling are of utmost importance in any electrical system. Faulty or incorrect wiring practices can result in various issues, including electrical hazards, malfunctions, and system failures.

Using the right wires and cables, following industry standards and regulations, and employing proper installation techniques ensure the safe and efficient operation of electrical systems. Proper wiring and cabling reduce the risk of electrical shocks, fire hazards, and equipment damage.

Additionally, well-designed and installed wiring and cabling systems minimize signal interference, ensuring reliable transmission of electrical signals or data. This is particularly crucial in applications such as telecommunications, where signal quality and integrity are paramount.

Regular inspection, maintenance, and periodic testing of wiring and cables are essential to identify potential issues, such as insulation degradation or conductor damage, before they escalate into larger problems. By adhering to best practices and investing in quality materials and installation, the longevity and performance of electrical systems can be significantly improved.

Wire and Cable Testing

Testing wires and cables is a critical aspect of quality assurance and compliance with industry standards. Various tests are performed to ensure the integrity and reliability of the electrical connections. Some common tests include:

Continuity Testing: This test verifies if a wire or cable is conducting electrical current from end to end without any breaks or interruptions.

Insulation Resistance Testing: It measures the resistance of the insulation material surrounding the conductor. Higher resistance values indicate better insulation integrity.

Voltage Withstand Testing: This test assesses the ability of the wire or cable to withstand specified voltage levels without breakdown or failure.

Electromagnetic Interference (EMI) Testing: EMI tests evaluate the susceptibility of cables to electromagnetic interference, ensuring their ability to maintain signal integrity in the presence of external electromagnetic fields.

By conducting these tests during the manufacturing process and periodically throughout the lifespan of the wires and cables, manufacturers and end-users can ensure that the products meet the required standards and specifications.

Conclusion

Understanding the difference between wire, cable, conductor, and related terminologies is crucial for anyone working with electrical systems. Wires, cables, and conductors each have unique characteristics and applications, and selecting the right one is essential for optimal performance and safety.

By considering factors such as voltage, current capacity, insulation, and environmental conditions, individuals can make informed decisions when choosing wires or cables for specific applications. Proper installation, regular maintenance, and adherence to industry standards ensure the reliable and efficient operation of electrical systems while minimizing risks.

Remember to prioritize safety, consult experts when needed, and stay informed about advancements in wire and cable technologies to make the best choices for your electrical projects.

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Features and Advantages of Flame Retardant Cables

Advantages of Flame Retardant Cables

Flame retardant cables are a crucial component in the construction and safety of many buildings and infrastructure projects. These specialized cables are designed to prevent the spread of fire and to minimize the damage caused by flames in the event of a fire.

Flame retardant cables are made using a variety of materials and techniques that make them resistant to the spread of flames. The most common materials used in the construction of flame retardant cables are polyvinyl chloride (PVC Cable) and polyolefin. PVC is a highly durable plastic that is resistant to flames and is often used in the insulation of electrical cables. Polyolefin, on the other hand, is a type of plastic that is derived from polyethylene and is known for its excellent flame resistance and flexibility.

In addition to the use of flame-resistant materials, flame retardant cables are also treated with chemicals that further enhance their fire resistance. These chemicals, known as flame retardants, are added to the insulation of the cable and help to prevent the spread of flames along the length of the cable.

Features Of Flame Retardant Cables

One of the most important characteristics of flame retardant cables is their ability to maintain their structural integrity in the face of a fire. This is particularly important in buildings and other structures where the cables are used to carry electrical power. If a cable were to fail during a fire, it could cause the fire to spread or cause a dangerous electrical malfunction. Flame retardant cables are designed to continue functioning even in the event of a fire, allowing people to evacuate the building safely and preventing further damage to the structure.

In addition to their use in buildings, flame retardant cables are also commonly used in a variety of other applications. For example, they are often used in transportation infrastructure, such as in the wiring of trains and buses. They are also used in the oil and gas industry, where they are used to power offshore drilling rigs and other equipment.

Despite their many benefits, there are also some potential drawbacks to the use of flame retardant cables. One of the main concerns is the environmental impact of the chemicals used in their production. Many of the chemicals used in flame retardant cables are toxic and can have negative effects on the environment and human health if they are not properly disposed of.

Another potential issue with flame retardant cables is their cost. These specialized cables are often more expensive than non-flame retardant cables, which can make them less attractive to cost-conscious consumers. However, the added safety and protection provided by flame retardant cables often makes them a worthwhile investment.

Overall, flame retardant cables are an important component in the safety and construction of many buildings and infrastructure projects. Their ability to prevent the spread of flames and to maintain their structural integrity in the face of a fire make them a valuable tool in protecting people and property. While there are some potential drawbacks to their use, the benefits of flame retardant cables often outweigh any potential drawbacks.

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The Types and Applications of High-Voltage Cables

High-voltage cables are a type of electrical cable that is designed to carry high-voltage electricity from one point to another. These cables are typically used in the transmission and distribution of electricity in power grids, as well as in industrial and commercial settings.

Some Of The Most Common Types Of High-Voltage Cables Include:

There are several different types of high-voltage cables, each of which is designed to meet specific requirements and applications.

Extruded cables - These are the most common type of high-voltage cables. They are made by extruding a mixture of polyethylene or ethylene-propylene rubber (EPR) over a copper or aluminum conductor. Extruded cables are typically used in overhead transmission lines, as well as in underground and submarine power cables.

Crosslinked polyethylene (XLPE) cables - XLPE cables are similar to extruded cables, but they are made using a crosslinking process that creates a more durable and flexible cable. XLPE cables are often used in underground and submarine power cables and high-voltage direct current (HVDC) transmission systems.

Paper-insulated cables - Paper-insulated cables are made by wrapping layers of paper around a conductor, typically used in overhead transmission lines. These cables are relatively inexpensive and easy to install, but they are less durable and less efficient than other types of high-voltage cables.

Oil-filled cables - Oil-filled cables are made by filling a steel or aluminum conduit with oil, and they are often used in underground power cables. These cables are highly durable and efficient, but they can be difficult to install and require regular maintenance.

Some Of The Most Common Applications Include:

In addition to these types of high-voltage cables, there are also several different applications for high-voltage cables.

Transmission lines - High-voltage cables are typically used in transmission lines, which are long-distance power lines that carry electricity from power plants to substations. These lines can be overhead or underground, and they are typically rated for voltages ranging from 115 kV to 765 kV.

Distribution lines - Distribution lines are shorter power lines that carry electricity from substations to individual homes and businesses. These lines are typically rated for voltages ranging from 4 kV to 35 kV, and they can be overhead or underground.

Industrial and commercial applications - High-voltage cables are also used in industrial and commercial settings, such as factories, hospitals, and office buildings. These cables are typically rated for voltages ranging from 480 V to 15 kV, and they are used to power machinery, lighting, and other equipment.

Summarize

Overall, high-voltage cables are an essential component of the electrical power grid, and they are used in a wide variety of applications. These cables are designed to carry high-voltage electricity safely and efficiently, and they play a crucial role in the transmission and distribution of electricity.

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HTLS Conductor Cable: Types and Characteristics for High-Temperature Power Transmission

HTLS conductor cable, or high-temperature low-sag conductor cable, is a type of electrical conductor that is used in high-voltage power transmission lines. It is designed to operate at high temperatures without losing its mechanical strength or electrical conductivity. This allows the cable to carry high currents over long distances without sag, which can reduce the overall efficiency of the transmission line.

There are several types of HTLS conductor cables, each with its unique characteristics and applications.

Some of the most common types include:

AC HTLS conductor cable This type of cable is designed for use in alternating current (AC) power transmission systems. It consists of multiple strands of aluminum or aluminum alloy, which are twisted together to form a single conductor. The strands are coated with a layer of insulation, such as polyethylene or cross-linked polyethylene, to prevent electrical leakage and provide mechanical support. AC HTLS conductor cables are typically used in high-voltage power transmission lines, where they can operate at temperatures up to 200 degrees Celsius without losing their strength or conductivity.

DC HTLS conductor cable This type of cable is designed for use in direct current (DC) power transmission systems. It consists of a single strand of copper or copper alloy, which is coated with a layer of insulation to prevent electrical leakage and provide mechanical support. DC HTLS conductor cables are typically used in high-voltage DC transmission lines, where they can operate at temperatures up to 250 degrees Celsius without losing their strength or conductivity.

Composite HTLS conductor cable This type of cable is a combination of AC HTLS and DC HTLS conductor cables. It consists of multiple strands of aluminum or aluminum alloy, which are twisted together to form a single conductor. The strands are coated with a layer of insulation, such as polyethylene or cross-linked polyethylene, to prevent electrical leakage and provide mechanical support. The composite HTLS conductor cable also contains a single strand of copper or copper alloy, which is coated with a layer of insulation to provide additional conductivity and mechanical support. Composite HTLS conductor cables are typically used in high-voltage transmission lines, where they can operate at temperatures up to 250 degrees Celsius without losing their strength or conductivity.

Concentric HTLS conductor cable This type of cable is a variation of composite HTLS conductor cable. It consists of multiple strands of aluminum or aluminum alloy, which are twisted together to form a single conductor. The strands are coated with a layer of insulation, such as polyethylene or cross-linked polyethylene, to prevent electrical leakage and provide mechanical support. The concentric HTLS conductor cable also contains a single strand of copper or copper alloy, which is coated with a layer of insulation to provide additional conductivity and mechanical support. The copper strand is arranged concentrically around the aluminum conductor, forming a "core-shell" structure. Concentric HTLS conductor cables are typically used in high-voltage transmission lines, where they can operate at temperatures up to 250 degrees Celsius without losing their strength or conductivity.

Summary

Overall, HTLS conductor cables are an important component of high-voltage power transmission systems. They are designed to operate at high temperatures without losing their mechanical strength or electrical conductivity, which allows them to carry high currents over long distances without sag. Different types of HTLS conductor cables are suitable for different applications, depending on the type of power transmission system and the operating conditions of the transmission line.

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OPGW vs. ADSS: Understanding the Differences Between Fiber Optic Cable Types for Power Transmission Lines

Difference Between OPGW Fiber Optic Cable and ADSS Fiber Optic Cable

OPGW and ADSS fiber optic cables are both types of outdoor fiber optic cables, which are used to transmit data over long distances. These cables are made up of extremely thin strands of glass or plastic, known as optical fibers, which are encased in the protective sheathing. The fibers are arranged in a bundle, called a cable core, which is then surrounded by additional layers of protective material to create the final cable.

While OPGW and ADSS fiber optic cables may appear similar at first glance. There are some key differences between the two that make them suitable for different applications and environments. Understanding these differences is important for choosing the right type of cable for a specific application.

Installation Method One of the main differences between OPGW and ADSS fiber optic cables is the way they are installed. OPGW fiber optic cable is installed on overhead transmission lines, while ADSS fiber optic cable is installed on the side of transmission towers. This means that OPGW fiber optic cable is subject to different environmental factors and physical stresses than ADSS fiber optic cable.

Type of Protective Sheath Another key difference between OPGW and ADSS fiber optic cables is the type of protective sheathing they use. OPGW fiber optic cable is encased in a layer of metal, typically aluminum or steel, which provides additional strength and protection. This metal sheathing also serves as a conductor, allowing the cable to function as a ground wire for the transmission line. ADSS fiber optic cable, on the other hand, is typically encased in a layer of aramid yarn, which provides strength and protection without conducting electricity.

Difference of Design The design of OPGW and ADSS fiber optic cables is also different. OPGW fiber optic cable is typically designed with a central tube, called the loose tube, which is filled with optical fibers. The loose tube is surrounded by a layer of water-blocking gel, which helps to protect the fibers from moisture. The cable is then surrounded by additional layers of protective material, such as aramid yarn, to provide additional strength and protection. ADSS fiber optic cable, on the other hand, typically uses a tight buffer design, where each fiber is encased in a layer of protective material, called a buffer coating. This provides additional protection for the fibers, making them more resistant to damage from bending or crushing.

Temperature Rating Another key difference between OPGW and ADSS fiber optic cables is their temperature rating. OPGW fiber optic cable is typically designed to operate at temperatures ranging from -40°C to 85°C, while ADSS fiber optic cable is typically designed to operate at temperatures ranging from -40°C to 70°C. This means that OPGW fiber optic cable is better suited for use in extreme temperature environments, while ADSS fiber optic cable is more suitable for use in milder temperature conditions.

Transmission Performance In terms of transmission performance, OPGW and ADSS fiber optic cables are generally similar. Both types of cables can transmit data at high speeds over long distances, without the need for signal amplification. They are also immune to electromagnetic interference, making them ideal for use in environments with high levels of electromagnetic interference.

One of the main advantages of OPGW fiber optic cable is its ability to function as a ground wire for the transmission line. This means that it can provide both data transmission and grounding capabilities, which can simplify the design of the transmission line and reduce the amount of cable required. ADSS fiber optic cable, on the other hand, does not conduct electricity, so it cannot be used as a ground wire.

About ZMS Cable

ZMS Cable Company is a renowned manufacturer of both ADSS and OPGW fiber optic cables, and our products offer several advantages. ZMS' ADSS cables are made of high-quality materials, such as aramid yarn and aluminum-clad steel, which provide excellent strength and durability. These cables are suitable for use in areas with high wind loads and harsh environmental conditions. ZMS' OPGW cables, on the other hand, offer high electrical conductivity and lightning protection, which is essential for power transmission lines. These cables also have low attenuation and excellent bandwidth, making them ideal for high-speed data transmission. Additionally, both ZMS' ADSS and OPGW cables have been rigorously tested to ensure they meet industry standards and customer requirements.

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Nautilus Acquires 54 MW Solar Project in New York

54 MW Solar Project in New York

Nautilus, a New Jersey-based independent solar energy producer, on behalf of its affiliate Nautilus U.S. Power Holdco, announced the acquisition of 54 megawatts of solar projects from Seaboard, a developer of utility-scale solar projects. The portfolio includes nine community solar projects in New York and is expected to reach commercial operation in the fourth quarter of 2023.

Sonnedix, a global independent solar power producer, has acquired a 26 MW portfolio of operational solar projects in Spain. The portfolio includes three projects with a total of 11 solar PV sub-projects located in different regions of Spain, including Aragon, Castilla, León, Castilla la Macha, and Murcia.

Revolve Renewable Power Corporation, a developer of utility-scale solar, wind, and battery storage projects, announced the sale of its 1,250 MW of solar plus storage projects to ENGIE IR Holdings, a wholly owned subsidiary of ENGIE, following the signing of a share purchase agreement. The sale includes the Parker Solar and Storage Project with a capacity of 250 MW and the Bouse Solar and Storage Project with a capacity of 1,000 MW.

Renewable energy company Enfinity Global acquired a 400 MW operating utility-scale solar portfolio to expand the company's presence in the United States.

Norwegian sovereign wealth fund Norges Bank Investment Management has signed an agreement to acquire a 49 percent stake in Iberdrola's upcoming renewable energy portfolio, which includes nearly 1.3 GW of solar and onshore wind projects in Spain. The Norwegian bank will pay 600 million euros ($649 million) for the stake, which values the portfolio at about 1.2 billion euros ($1.3 billion). The transaction is expected to close in the first quarter of 2023.

Renewable energy developer Econergy Renewable Energy has entered into a €150 million (about $157.7 million) loan agreement with Phoenix Insurance to support its solar photovoltaic projects in Romania and Poland. The loan, which was initially agreed upon between the two parties in February 2022, will be disbursed primarily in the form of a convertible loan (approximately €110 million (approximately $119 million), with an additional €40 million (approximately $4,327), as a fixed loan, two-thirds of which, or €100 million (approximately $108 million), is for its Romanian pipeline.

Solar power system components and the factors that influence them

1. What is a solar power system?

A solar power system consists of a solar cell bank, a solar controller, and a battery (bank). If you want the solar power system to output power to 220V AC or 110V, you also need to configure an inverter.

2. Solar power system classification.

Solar power generation system is divided into off-grid power generation system, grid-connected power generation system, and distributed power generation system.

2.1 Off-grid power generation system mainly consists of a solar cell module, controller, and battery, if the output power is 220V AC or 110V, an inverter is also required.

2.2. Grid-connected power generation system is the direct current generated by solar modules converted by grid-connected inverters into alternating current that meets the requirements of the utility grid and then directly connected to the public grid. Grid-connected power generation systems are centralized large-scale grid-connected power stations that are generally national, the main feature of which is that the generated energy is directly transmitted to the grid, and the grid is deployed to supply power to users. However, this kind of power station has a large investment, a long construction period, and large floor space, and has not been too much development. The decentralized small grid-connected power generation system, especially the integrated photovoltaic building power generation system, is the mainstream of grid-connected power generation due to the advantages of small investment, fast construction, small footprint, and strong policy support.

2.3. Distributed power generation system, also known as decentralized power generation or distributed energy supply, refers to the configuration of a smaller PV power supply system at or near the user site to meet the needs of specific users, support the economic operation of the existing distribution network, or meet the requirements of both.

The basic equipment of distributed photovoltaic power generation system includes photovoltaic modules, photovoltaic square brackets, DC sink boxes, DC distribution cabinets, grid-connected inverters, AC distribution cabinets, and other equipment, in addition to power supply system monitoring devices and environmental monitoring devices. Its operation mode is that under the condition of solar radiation, the solar cell array of the PV power generation system converts the solar energy output into electrical energy. Through the DC sink box, it is centrally sent to the DC distribution cabinet, and the grid-connected inverter is inverted into AC power to supply the building's load, and the excess or insufficient power is regulated by connecting to the grid.

3. Solar power system components

3.1.PV panels (solar panels, photovoltaic panels, solar photovoltaic modules), absorb light energy and convert light energy into electricity. Among them, the monocrystalline silicon conversion efficiency of 14 ~ 20%, the polycrystalline frog conversion efficiency of about 13%, and the amorphous frog is 8 ~ 10%.

3.2. Electricity storage equipment, the current off-grid power generation system's electricity storage equipment is mainly maintenance-free batteries, which can reserve the electricity generated by PV panels.

3.3. Charge and output control controller: The role of the controller is to control the whole system to work stably and safely.

3.4. Solar PV cables: Most of the DC cables in solar power plants are arranged outdoors, and the environment in which the scenes are used is very harsh, and the cable materials are selected according to the degree of UV, ozone, drastic temperature changes and chemical corrosion such as acid and alkali in the environment. 

If ordinary cables are used, working for a long time in a harsh environment will lead to the breakage of the cable sheath and even to the decomposition of the cable insulation layer, resulting in a short circuit and a fire accident. 

Therefore, the use of photovoltaic cables in solar power stations is necessary, photovoltaic cables and ordinary cables are different after the steps of radiation, radiation significantly improved the thermal properties, mechanical properties, and chemical properties of the cable insulation material, can withstand more ultraviolet radiation, severe temperature differences, and chemical corrosion.

3.5. Other mechanical equipment

4. Solar power system main cost components and factors affecting

4.1. PV board: The solar industry is currently in full swing, and one of the main reasons is the high price of the PV board, affecting the price of the PV board for the entire system. In addition, to control the PV board unit price, it is more important to control the number of PV panels used, the following factors affect.

A. Power generation. B. The weather condition of the PV board location. C. The different latitude of PV board location produces different power. D. The influence of PV board using environment.

4.2. Energy storage equipment: a power generation system to the user how much electricity a day, which determines the capacity of energy storage equipment, power generation system supply users with more electricity every day, the larger the capacity of energy storage equipment requirements, the higher the cost.

5. Solar customers need to provide information

Class A, (1) system output more power. (2) The user's daily electricity consumption, the power of power-using equipment, and the length of use of each power-using equipment. (3) The user's local weather and climate conditions (country, region). Class B, (1) All the user's power equipment and the length of time each power equipment is used. (2) User's local weather and climate conditions. Note: The system is generally designed to generate electricity for one day under sufficient sunlight, without considering rainy days, so the system will only be able to withstand the use of electrical equipment for one day, and the customer has other requirements to be considered separately.

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5 Minutes To Know The Difference And Application Of DC Cable And AC Cable

DC and AC cables are an essential part of any electrical system, providing the means for transmitting electrical energy from one point to another. In this article, we will explore the differences between DC and AC cables, their properties, and their applications.

Difference between DC cable and AC cable

DC, or direct current, is a type of electrical current that flows in one direction only. It is the type of current commonly used in batteries and solar panels. DC cables are designed to transmit DC electrical energy from one point to another, typically from a power source to a load.

AC, or alternating current, is a type of electrical current that periodically changes direction. It is the type of current commonly used in the electrical grid and in most household and industrial electrical systems. AC cables are designed to transmit AC electrical energy from one point to another, typically from a power source to a load.

One of the key differences between DC and AC cables is their conductivity. DC cables are generally more conductive than AC cables, due to the fact that DC electrical energy is transmitted more efficiently through a conductor than AC electrical energy. This means that DC cables are typically smaller and lighter than AC cables of the same wattage rating.

Another difference between DC and AC cables is their flexibility. DC cables are generally more flexible than AC cables, due to their smaller size and lighter weight. This makes them easier to work with and install in tight spaces. In contrast, AC cables are typically stiffer and less flexible, which can make them more difficult to install in certain applications.

DC cables are also generally more resistant to voltage drop than AC cables. Voltage drop is the loss of electrical energy that occurs as electrical energy is transmitted through a conductor. DC cables are less susceptible to voltage drop because DC electrical energy is transmitted more efficiently through a conductor than AC electrical energy.

In terms of applications, DC cables are commonly used in renewable energy systems, such as solar photovoltaic panels and wind turbines. They are also used in electric vehicles, portable electronics, and other applications where DC electrical energy is generated or used.

AC cables, on the other hand, are commonly used in the electrical grid, in household and industrial electrical systems, and in other applications where AC electrical energy is generated or used. They are also used in some renewable energy systems, such as hydroelectric power plants and certain types of wind turbines.

Summary

Overall, DC and AC cables are both essential components of any electrical system, providing the means for transmitting electrical energy from one point to another. While they have some differences, such as their conductivity, flexibility, and resistance to voltage drop, they are both designed to serve the same basic purpose.

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About The Characteristics Of Mineral Insulated Cables

Mineral insulated cables, also known as MI cables, are a type of electrical wiring that are used in a variety of applications due to their durability and performance in high temperature environments. These cables are made by enclosing conductive wires in a metal sheath, which is then filled with a highly stable insulating material such as magnesium oxide.

One of the key benefits of mineral insulated cables is their ability to withstand extreme temperatures. Because the insulating material used in these cables is highly stable, MI cables are able to maintain their integrity and performance even in environments with temperatures as high as 1,000 degrees Celsius. This makes them ideal for use in a wide range of applications, including industrial processes, power plants, and even in the aerospace industry.

Another advantage of mineral insulated cables is their durability. The metal sheath and insulating material used in these cables provide excellent protection against external factors such as moisture, corrosion, and mechanical damage. This makes them much more reliable and long-lasting than traditional electrical wiring, which can deteriorate over time and become a potential safety hazard.

In addition to their durability and high temperature performance, mineral insulated cables are also known for their low electrical resistance. Because the conductive wires are enclosed in a metal sheath, the electrical current flows through the cable more efficiently, reducing energy losses and improving the overall performance of the electrical system.

While mineral insulated cables do have some limitations, such as their increased weight and stiffness compared to traditional wiring, their unique properties make them a valuable option for a variety of applications. Overall, mineral insulated cables are an excellent choice for high temperature environments and situations where durability and reliability are critical.

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Brief Description Of The Characteristics And Advantages Of Overhead Power Lines

Overhead power lines are a type of electrical transmission system that is used to transmit electrical power over long distances. Unlike underground cables, which are buried beneath the ground, overhead power lines are supported by poles or towers and are visible above the ground.

Overhead power lines are an essential component of the electrical grid, providing a safe and efficient way to transmit electricity from power plants to substations and other distribution points. They are typically used for transmitting electricity at high voltages, typically between 66 kV and 765 kV, in order to reduce energy losses over long distances.

One of the key advantages of overhead power lines is their low cost. Compared to underground cables, overhead power lines are relatively inexpensive to install and maintain, making them a cost-effective option for transmitting electricity over long distances. Additionally, overhead power lines are relatively easy to repair and replace, which helps to ensure the reliability of the electrical grid.

Another advantage of overhead power lines is their flexibility. Because they are not buried underground, overhead power lines can be easily adjusted or relocated if necessary, allowing them to be used in a wide range of applications and environments. This flexibility makes overhead power lines a versatile option for transmitting electricity.

However, overhead power lines also have some disadvantages. One of the main challenges with overhead power lines is the potential for accidents and electrical shock. Because overhead power lines are visible above the ground, they can be accidentally damaged by vehicles, trees, or other objects. Additionally, overhead power lines can pose a risk of electrical shock to people or animals who come into contact with them.

Another disadvantage of overhead power lines is their potential impact on the environment. Overhead power lines can be visually obtrusive, causing aesthetic concerns for people living in areas where they are installed. Additionally, overhead power lines can interfere with the flight patterns of birds and other animals, potentially causing harm to wildlife.

Despite these challenges, overhead power lines are an essential component of the electrical grid, providing a safe and efficient way to transmit electricity over long distances. With careful planning and maintenance, overhead power lines can be used to reliably and cost-effectively transmit electricity to homes, businesses, and other locations.

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Wire And Cable General Knowledge Q & A

1. Single-Core Cable Sheath End Grounding Method, Why Must Be Installed Along The Cable Laid In Parallel With The Return Line?

In the metal sheath end of the grounded cable line, ensure that the induced voltage in the sheath does not exceed the allowable standard.

Must be installed along the cable line parallel laying of a conductor, and the two ends of the conductor grounded, this conductor is called the return line.

When a single-phase ground fault occurs, the grounding short-circuits current can flow back to the center of the system through the return line.

As the grounding current through the return line generated by the magnetic flux offset a portion of the magnetic flux generated by the cable conductor grounding current, thus reducing the induced voltage of the sheath when the short-circuit fault.

2. Cable Works Can Be Divided Into Several Projects?

(1) Site transportation: including the loading and unloading of engineering materials from the warehouse to the construction site, transportation, and empty backhaul.

(2) Local works: including road excavation, tunnel and trench construction, etc.

(3)Laying works: including laying, intermediate head making, lifting the cover, buried pipe, school tide, traction head making, etc.

(4) Both ends of the project: support, suspension bridge, and its foundation production and installation, terminal head production, oil pressure, and signal device installation, the name species electrical performance testing, etc.

(5) Plugging engineering: including the production of an oil-filled cable plugging head, the installation of an oil supply tank, automatic drainage and signaling device, etc.

(6) grounding engineering: including insulation joints, transposition boxes, protectors, grounding box installation, etc.

3. What Checks Should Be Carried Out For The Acceptance Of Cable Lines?

(1) Cable specifications should be by the provisions, the arrangement should be neat, with no damage, and complete, correct, and clear labeling.

(2) The fixed bending radius of the cable, the distance concerned and the wiring of the metal sheath of the single-core power cable should meet the requirements.

(3) cable termination, the intermediate head does not leak oil, firmly installed, oil-filled cable oil pressure and meter calibration value should meet the requirements.

(4) Good grounding.

(5) The cable terminal phase color is correct, and the metal parts of the bracket are painted intact.

(6) cable trench and tunnel, the bridge should be free of debris, and the cover plate is complete.

4. What Are The Requirements Of The Cable Line Positive Sequence Impedance Measurement Process?

The AC resistance of the cable conductor and the phase sum of the three identical inductances of the cable is called positive sequence impedance.

The positive sequence impedance of the cable line can generally be measured directly on the cable tray, and a lower voltage is generally used for the measurement.

Therefore, a step-down transformer is required to step down the voltage, the step-down transformer uses star wiring, and the capacity is generally 10kVA or more.

There is a wide range of voltage regulations, measurement of the AC power supply should be relatively stable to ensure that the measurement of the current meets the specified requirements.

The actual voltage meter reading value must be the voltage at the end of the cable, the test current is good close to the long-term allowable cable current, measuring and reading the value of each meter, close the current while reading the value of the three tables.

5. According To The "Electrical Production Safety Regulations", The Electrical Staff Must Have The Conditions Of What?

Must have the following conditions.

(1) identified by a doctor's physical health, no medical conditions that prevent work.

(2) have the necessary electrical knowledge, according to the nature of their duties, and work to master the relevant regulations, professional techniques, and safety operation techniques, and passed the examination.

(3) skilled in first aid methods for electrocution.

6. What Should Be Noted In The Process Of Transport Loading And Unloading Of Cables?

(1) in the transport loading and unloading process, should not make the cable and cable tray damaged, it is strictly prohibited to push the cable tray directly from the car, the cable like should not be flat transport or flat storage.

(2) before transporting or rolling the cable tray, must ensure that the cable tray is solid, cable winding tight, oil-filled cable to the pressure tank between the oil pipe should be fixed, shall not be damaged, the pressure tank should be solid, the pressure indication should meet the requirements. 

7. What Are The Measures For Cable Fire Prevention?

(1) The use of fire-retardant cables.

(2)Adopt a fireproof cable bracket.

(3) The use of fire-resistant coatings.

(4) cable tunnel, mezzanine exit, etc. set fire partition wall, fire baffle.

(5) overhead cables should avoid oil pipelines, and explosion-proof doors, otherwise there should be to take localized piping or insulation fire prevention measures.

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2022 Future Trends in the Cable Industry: High Capacity, Underground and Energy Efficiency

The wire and cable industry underpins the functioning of modern economies and societies. This report focuses on the 10kV and above cable industry and highlights high capacity, underground, and energy efficiency as future trends in the cable industry.

Cables of 10kV and above are mainly used in power generation, transmission, and distribution, as well as in some large industrial and commercial buildings. In terms of technical form, 10kV and above cables are currently available as overhead lines, underground cables, and GIL (gas insulated transmission lines).

Each of these three technical solutions has its advantages and disadvantages. The main advantage of overhead lines is that they are cheap and the disadvantage is that the support facilities take up a lot of space. Underground cables have the advantage of not taking up much space, but the disadvantages are that points of failure are difficult to detect and the insulation is susceptible to deterioration, while the advantages of GIL are that it performs well and does not take up much space.

It is expected that these three transmission methods will continue to be the primary means of building the power grid and supporting the construction of large-scale power systems.

1. New Conductors Increase Transmission Capacity of Overhead Lines

Because the overhead transmission system relies primarily on air insulation, it is the most common solution for high-voltage transmission away from cities because of its low cost, large area, and high capacity. Lines of 750 kV and above will be used almost exclusively for very high voltage transmission projects over long distances. With the acceleration of new power system construction, the overall demand for grid transmission capacity is expected to accelerate.

Recently, MarketsandResearch.biz published the "Global Aerial Bundled Cable Market 2022 by Manufacturers, Regions, Type, and Application, Forecast to 2028." The report forecasts steady growth for aerial cables by 2028 for the leading companies in the cable industry (Nexans France, ZMS Cable Group, EMTA Conductors and Cables, etc.).

The future trend for overhead lines will be to increase capacity. New construction projects can be more energy-efficient conductors, and already built projects can be upgraded with additional capacity.

(1) Energy-saving wire for new projects, saving transmission losses.

Traditional wire for aluminum strands with a steel core. To improve the overall conductivity of the conductor and reduce losses, the usual idea is to improve the conductivity of the outer section of the aluminum strand or use a higher conductivity of the carrier core.

The outer stranded section can be made of a hard aluminum alloy with high conductivity (61.5%-63% IACS) or soft aluminum (63% IACS). However, due to the low tensile strength of soft aluminum, a stronger carrier core, such as a carbon fiber composite core, is required. Since soft aluminum also has excellent high-temperature resistance, it is more suitable for capacity-building projects.

For the load-bearing part, a high-strength aluminum alloy core (52%-55% IACS) can be used instead of a steel core. This results in a higher conductivity of the aluminum alloy core strand, which also has excellent tensile strength. Therefore, new projects mainly use energy-saving conductors with high-conductivity aluminum, aluminum alloy, or all-aluminum alloy cores.

(2) Capacity-added conductors are suitable for existing projects and are extremely cost-effective.

Theoretically, there are two main methods to increase the capacity of constructed lines.

(1) By replacing the conductor with an overhead conductor of the larger cross-section. However, increasing the cross-sectional area of the cable greatly increases the total weight of the overhead conductors, making them unviable for electrical towers. Therefore, a new electrical tower would have to be rebuilt. This method involves high investment, a long construction period for reconstruction, and a very low overall cost.

(2) Replace the conductor only with a capacitor conductor. The increase in capacity can be achieved without increasing the total weight of the conductor too much. It has the advantages of no tower replacement, low total investment, and a short construction period. With a capacity increase of 30-150%, it is usually possible to meet the capacity requirements of medium-term developments and is a very cost-effective option.

Overhead lines must be able to operate at a normal temperature of 100 to 150 degrees. In this regard, there are two technical ideas for improving the wire's resistance to high temperatures. One is the use of a flexible aluminum wire with a very strong core that can withstand high temperatures. The other is the use of heat-resistant aluminum alloy wire with the addition of rare earth elements such as zirconium and yttrium. With proper design and selection, capacity can be increased by simply changing the conductor.

In summary, aluminum, aluminum alloy core, or full aluminum alloy as the representative of energy-saving wire, and heat-resistant aluminum alloy, soft aluminum wire, and carbon fiber composite core type as the representative of the capacity of the new wire is an important development direction of the future.

2. Urban development and offshore wind power to promote the rapid development of the cable industry

Underground cables. Despite the excellent cost-effectiveness of overhead lines, new urban transmission and distribution lines are increasingly built using underground cables due to space, environmental protection, and operational safety constraints. In addition, existing urban overhead lines will increasingly be converted to underground cables. There is a clear trend toward burying urban power networks.

Submarine cables. Offshore wind power, which represents a significant portion of the future of new energy generation, is one of the fastest growing sectors of the future. Submarine cables benefit not only from the growth in installed capacity of offshore wind power but also from the growth in the distance of offshore wind power. In the context of the global energy revolution, submarine cables are expected to experience an exceptional period of development as the preferred solution for networking power between land and islands.

3. Very high capacity transmission: GIL corridors

GIL transmission systems consist primarily of a grounded aluminum alloy shell and integrated aluminum tubular conductors insulated with gases such as SF6.

GIL transmission technology is expected to be used more often in high-power applications. With the gradual increase in urban electrical loads, there are already situations in some medium and large cities or industrial parks where cables cannot meet the power requirements.

GIL lines have lower transmission losses, lower capacity effects, and higher capacity than cables, and their high transmission capacity (up to 3000 MVA in a single circuit at 550 kV) allows them to be directly connected to overhead lines in suburban areas.

Although the initial cost ratio of GIL is currently very high, it has a long service life. GIL systems, over 300 km in length, have been in service for over 35 years worldwide and no system failures have been reported to date.

For large capacity transmission systems that do not cover long distances, GIL is a more suitable technology than large cross-section cables that require air-, water- or parallel-cooled structures.

Summary Through analysis of overhead lines, underground cables, submarine cables, and GIL transmission systems, ZMS believes that the future direction of cable development will be high capacity, underground, and energy efficient. The evolution of technology has led to several new changes in the cable industry, which will result in numerous investment opportunities.

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2022 Submarine Cable Industry Outlook Market Size Analysis

2022 submarine cable market share, submarine cable market space how?

Today ZMS cable small summary of some of the following.

Current domestic and international submarine cables exist in a broad market and application prospects, mainly reflected in the following markets: coastal cities and islands market, offshore oil platforms with submarine cable market, rivers, lakes, and another underwater cable market, offshore wind power and power transmission with submarine cable market, Southeast Asia and other international markets.

Submarine cable industry development prospects and market size analysis in 2022. Submarine cables are cables wrapped with insulating materials and laid on the seabed for telecommunication transmission.

Submarine cables are divided into submarine communication cables and submarine power cables. Modern submarine cables are using optical fiber as the material to transmit telephone and Internet signals.

Submarine cables are classified by product and can be divided into five types. 1 Impregnated paper-covered cables 2 Self-capacitating oil-filled cables 3 Extruded insulated cables 4 Oil-compressed tubular cables 5 Gas-filled cable

Offshore wind power cost components and submarine cable account for about 8-10%. Offshore wind farm costs are mainly composed of the following components: equipment acquisition costs, construction and security costs, other costs, and interest. Equipment costs of wind turbines and towers account for about 85% of the cost of equipment, and about 5% of the delivery of submarine cable. Construction and safety costs include offshore construction, ship class costs, etc. Other costs include project land use fees, project construction, and management fees, production preparation fees, etc.

In subdivision configuration, the submarine cable accounts for about 8-10% of the total cost, including the array cable (about 3%) as well as sending out the cable (about 5-10%). According to the China Research Institute of Industry published "2021-2026 China submarine cable industry development prospects and investment risk forecast analysis report" shows. China's submarine cable market continues to expand, with the attention of various cable manufacturers and is seen as a new profit growth point. But in the submarine cable market is a need to invest heavily in research and development funds, long-term technology accumulation, and the process of protracted war.

Domestic companies want to stand firm in the international submarine cable market, the first step is to improve the level of technology. In addition to improving the level of technology, through many product certifications, submarine cable manufacturers to win the market, must also rely on the long-term formation of the brand effect.

The rapid development of the offshore wind power industry synchronously pulls the growth in demand for submarine cables. Submarine cable is an important part of the development of offshore wind power projects, but also the main difference between offshore wind power and onshore wind power, accounting for about 8% of the investment in offshore wind power. In 2020, the global wind power submarine cable industry market size of 11.9 billion yuan, and last year's market size is similar to the average annual compound growth rate of 22.35%, the growth rate accelerated.

It is expected that by 2025, the global market size to 57.8 billion yuan. In 2021, in the wind power industry, China pays more attention to offshore wind power than onshore wind power. Therefore 2021 offshore cable market size is expected to be explosive growth. ZMS cable editorial data collection shows that in 2020, China's wind power submarine cable industry market size of 6 billion yuan, up 53.85% year-on-year, with an average annual compound growth rate of 79.48%. The average annual rate is 3.5 times the global growth rate and is expected to reach a market size of 25.4 billion yuan by 2025. Offshore wind power generation exceeds the UK in 2021, becoming the world's number one.

According to the data, the global cumulative installed capacity of offshore wind power exceeds 35 million kilowatts in 2020, compared to 6 million kilowatts in 2019, of which more than 3 million kilowatts of offshore wind power will be added. In 2020 and 2021 the offshore wind power rush to install the wave. According to the Polaris power network summary, it is expected that the "14th Five-Year Plan" during the new offshore wind power scale of more than 32 million kilowatts, the average annual new offshore wind power installation of more than 6 million kilowatts.

2021-2025 global submarine cable market compound annual growth rate will reach 11.04%, during which the scale of growth is expected to exceed $ 3.8 billion. Growing demand for fast and reliable data and increased investments due to IoT and cloud-based technology development will contribute to the rapid growth of the submarine fiber optic cable market in the coming years.

Meanwhile, the increasing penetration of smartphones and growing demand for bandwidth-expanding applications for high-speed internet will significantly drive the growth of the global submarine fiber optic cable market. The construction of submarine fiber optic cable has a dominant role in international communication.

The level of international communication of a country is directly linked to the level of interconnection of international fiber optic cables. 99% of global communications and data are transmitted through submarine cables. And currently, in the field of submarine fiber optic cable, is the world of Europe, America, and Japan. At present, there are about 400 submarine fiber optic cables around the world, with a total length of more than 1.2 million kilometers, which can rotate around the earth 30 times. And in the construction of these cables, mainly by Japan Electric NEC, the United States SubCom LLC, and France Alcatel submarine network companies. These companies hold the world's leading technology, which allows them to earn huge profits.

Of the more than 200 countries and regions in the world, only 44 do not have coastlines and do not need to build international submarine cable communications. Those remaining countries and regions, on the other hand, all need to build submarine fiber optic cables. With China's offshore wind power project cable bidding to "manufacturing + laying" the whole package mode change, with the whole package capacity of the submarine cable companies in the process of winning the project will be more competitive. With the "double carbon" goal and the country vigorously supporting the development of a green low-carbon energy industry, the development of China's wind power industry is widely seen.

Compared to onshore wind power, offshore wind power potential is greater. The submarine cable industry research report aims to start from the national economic and industrial development strategy.

Analyze the future policy direction of submarine cable and the development trend of the regulatory system, and explore the market potential of the submarine cable industry. Based on in-depth research in key market segments, it provides a vivid depiction of market changes from multiple perspectives such as industrial scale, industry structure, regional structure, market competition, and industry profitability levels, and a clear development direction.

This is the analysis of the development prospects and market size of the submarine cable industry. ZMS cable company always insists on providing high-quality cables, good quality and low price, considerate service, and products after strict manual qualification audit, which is trustworthy.

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What are The Advantages and Functions of Overhead Cables?

Overhead cable is often in sight, and if you are on a highway you will no doubt have seen it. It is a cable line that is erected on top of a tower or other method. This type of cable line is usually found in big cities, as the majority of the countryside does not take into account certain standards. So what exactly is called overhead cable? Overhead cable is composed of two or two groups of transmission lines together, and transmission lines are alias overhead lines, then you should now understand what is called overhead cable!

The Role Of Overhead Cables

The overhead cable transmits everyone's electricity to each territory and then is sent to each subsequent residential community, into household electricity, so the overhead cable for everyone is very important.

The Advantages Of Overhead Cables

1. High credibility of the power supply system, the choice of overhead cable can significantly reduce a variety of short-circuit fault common failures (especially the common short-circuit fault common failures of bare transmission lines in the airframe), compared with bare transmission lines in the airframe, the equipment failure rate is 4-6 times lower.

2. Good safety factor of the power supply system, is the choice of overhead cable so that personal safety and electrocution accident safety accidents significantly reduced. When the overhead cable in connection with the power supply, when the body or other small animals accidentally touches the surface of the cable line insulation layer if the cable line is not penetrated. It is not easy to cause adverse effects on both people and animals.

3. Convenient to build and overhaul, the overhead cable can be built on all types of towers, but also along the wall, in special cases can also be shuttled in the woods, immediately fixed immovably in the main pole with gold fittings.

4. Reasonable and effective, although the choice of overhead cable than the choice of bare transmission lines in the airframe should be more expensive, but cheaper than the general underground installation of cable lines. Therefore, its comprehensive engineering cost is lower, has more economic development, and is more effective.

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EV Charging Cable - ZMS kV Cable

Electric Vehicle Charging Cable (EV Charging Cable) With the maturity and application of electric vehicle technology, the construction of basic charging facilities for electric vehicles has become the focus of development. The electric vehicle charging cable is a basic component of electric vehicle charging facilities, and its performance has an important impact on the whole charging process. ZMS is a professional

Electric Vehicle Charging Cable (EV Charging Cable) With the maturity and application of electric vehicle technology, the construction of basic charging facilities for electric vehicles has become the focus of development.

Email:[email protected]

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Types of Thermocouple Extension Cable and Wire—ZMS Industrial Supply

ZMS Cable can provide 2 wire 3 wire thermocouple compensating cables, and the best thermocouple wire prices.

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Selection Of Cable Lines And Cable Cross-Section—ZMS Cable

Quickly teach you how to choose the right cable line and the corresponding cable cross-sectional area.

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Some Characteristics of Composite Insulator DC Electric Field—ZMS

The main hazard of composite insulator ice cover is the line tripping brought by ice cover flashover, avoiding this hazard is a subject.