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Transformer Insulation for Oil cooled Transformers

Oil cooled transformers form the basis and backbone of any transmission and distribution system of power in a country. Oil cooled transformers are the most preferred choice due to their relatively better efficiency and life compared to other types of transformers.Transformer insulation used in such oil-cooled equipment is cellulosic material made from pure unbleached kraft wood pulp. These can be in different forms namely, Transformer Insulating Pressboard and Insulation paper.Given below are different types of

Transformer Insulation

which are being generally used:

Pre-Compressed Press Board components

like spacers, ducts, trapezoidal strips, T- strips, blocks, washers or circles, yoke insulation, phase barrier insulation, cylinders, ladders, etc. These are manufactured by machining of transformers insulating pre-compressed pressboards by process of shearing, punching, moulding, rolling, etc. These components are used in coils and inside of the transformer to insulate various active parts from each other and also to facilitate sufficient oil flow between components for cooling.

Transformer insulating kraft paper

comes in thickness from 1.5 mil to 5 mil. It is used for various interlayer applications and also for the covering of aluminum and copper conductors in transformers. They are also made from long virgin fibers of cellulose having high mechanical and electrical strength. The water used for the manufacturing of this paper must be demineralized and of very high purity so that the conductivity of the paper is extremely low.

Transformer insulating pressphan paper

comes in thickness from 5 mil to 20 mil. This is used in both interlayer applications as well as cylinders in small transformers. The density of this paper is more than Insulating kraft paper as the pressing load is higher in this case. The breakdown voltage of Insulating pressphan paper is also higher compared to all other insulating papers used in oil-cooled transformers.

Transformer Insulating Diamond dotted epoxy paper

is a variety of transformer insulating kraft paper or pressphan paper on which epoxy resin square dots are impregnated at a certain distance. When this paper is used to make coils and such coils are subjected to heat in ovens to remove excess moisture from transformer parts, the epoxy resin melts above 100 deg C and binds the conductors around it. This is very useful in preventing the dislocation of conductors due to vibrations when the transformer is in operation in the field.

Transformer Insulating crepe paper

is insulating kraft paper which is creped using a special machine and chemical. This process makes the paper stretchable by up to 80 to 120% of its original length when pulled laterally. Transformer Insulating crepe paper is used in covering lead-outs in power transformers, in covering the core of instrumentation transformers and also in covering of rectangular profile conductors for single-phase transformers.

Pristine Technologies & Industries is a Leading Manufacturer of Rubberised Cork Washers For Inquiry Call: +91-141-2587255 / +91-8107449293 Email: [email protected]

#Press Board Components #Transformer Insulation #Transformer Insulating crepe paper #Transformer insulating kraft paper #Pre-Compressed Press Board components

Pristine Press Board Components

Pristine Technologies & Industries (Unit of Balasaria Agencies Pvt Ltd.) is an ISO 9001:2015 certified company engaged in manufacturing of Electrical Grade Insulating Pre Compressed. Press Board Components & Paper Components along with Rubberised Cork Sheets & Components. It is located in Jaipur, Rajasthan, India

Established in 2010, PTI has been a leading manufacturer of Rubberized Cork Sheets and Components for the electrical transformer industry catering to both domestic as well as export markets & distribution as well as power transformer manufacturers. The company is approved by PGCIL & BHEL also. Manufacturing of PCB & Insulating Paper Components commenced in the year 2018 with exclusive use of ABB India Ltd (Raman Boards) materials.

Our innovation team continously strives for improvement in quality and manufacturing at various levels. Remaining competitive in the market and providing best quality material is our goal.

Our key product offerings in insulation segment are :

Sigmacom 3.1 machined & milled components like spacers, oil ducts, strips, rings/washers, blocks, yoke barriers, phase barriers etc.

Sigmacom 33 machined components like above.

Insulating Crepe Paper from 2 mil to 5 mil thickness in width as desired by the customers.

Insulating Epoxy Diamond Dotted Paper from 3 mil to 5 mil thickness in width from 40 mm upwards.

Insulating Kraft Paper from 2 mil to 5 mil thickness in width as desired by the customers.

Insulating Pressphan Paper in 10 mil & 20 mil thickness in width from 40 mm upwards.

Pristine Machine Press Board Components Machine components are insulation used in oil filled power & distribution transformers. They come in various forms like spacers, strips, ducts, rings, phase barriers, yokes etc.

Pristine Technologies & Industries manufactures them using two kind of press boards of ABB India Ltd - ' Raman Boards ' make :

Sigmacom 3.1 : Recommended for transformer ratings from 33 KV to 220 KV class.

Sigmacom 33 : Recommended for transformer ratings of 11 KV & 33 KV class. Pristine Technologies & Industries is a Leading Manufacturer of Rubberised Cork Washers For Inquiry Call: +91-141-2587255 / +91-8107449293 Email: [email protected]

#Press Board Components

Impact of Insulating Press board insulation on life of Electrical Transformers

http://www.pristinetech.in/blog/impact-of-insulating-press-board-insulation-on-life-of-electrical-transformers/Any electrical transformer is made broadly of two types of components

active parts and

non-active parts

Transformer insulation press boards & insulating papers form one of the non-active parts of oil-cooled electrical transformers. By non-active part, it is meant that there is no flow of current or magnetic induction through the components. Generally, the active part of a transformer can be easily tested when the transformer is made. On the other hand, transformer insulation cannot be tested easily.

Some of the parameters which are important in transformer insulating press boards & insulating papers & which determine the life of it are:

Ageing properties: Good quality transformer insulation will be made of the long virgin fibre of softwood found in cold climatic conditions. These long fibres, when formed into insulating pressboard & paper by the wet-laid process, gives a very tight cohesive binding between its layers. As the fibres are virgin, thus their strength is also uncompromised. This insulation material made from such fibres will have excellent ageing properties, resulting in a long life of transformers.

The purity of fibres: For manufacturing of economical grade of press boards, a certain quantity of secondary fibres are mixed with virgin fibres. These secondary fibres are shorter in length and thus have lower integrity to insulation structure. Such press boards tend to leach out fibres in transformer oil over a period of time, making it impure. Such impure oil will reduce the life of the transformer as oil gradually loses its own properties of acting as a coolant.

Consistency of fibre layering: The main purpose of insulating pressboard is to stop transmission of electricity across itself. It is used in various forms in a transformer – usually spacers, ducts, trapezoidal or key strips, yoke insulation, phase barrier, footplate, cylinders blocks etc. It is important that every component should have consistent fibre layering across it to ensure that there is no weak spot through which electricity passes. This is also known as the breakdown voltage of the insulating material.

All the above three parameters are extremely important in any transformer insulating pressboard to ensure high life of the transformer. The source of such insulation is very important as these parameters can only be tested in specific laboratories and its impact is only known over a period of time.

We at Pristine Technologies & Industries ensure that only the best quality of Electrical Grade insulating press boards manufactured by ABB India Ltd (Erstwhile Raman Boards Ltd) is used in making of components by us. This results in high life & maintenance-free working of your transformers for long durations. Transformer insulation components manufactured by us can be used in distribution and power transformers from 11 KV class to 132 KV class ratings.

Pristine Technologies & Industries is a Leading Manufacturer of Rubberised Cork Washers

For Inquiry Call: +91-141-2587255 / +91-8107449293 Email: [email protected]

#Press Board Components

Press Board Components Manufacturer, Supplier

VinCork® Press Board Components

Our innovation team continuously strives for improvement in quality and manufacturing at various levels. Remaining competitive in the market and providing the best quality material is our goal.

Our key product offerings in the insulation segment are :

Sigmacom 3.1 machined & milled components like spacers, oil ducts, strips, rings/washers, blocks, yoke barriers, phase barriers, etc.

Sigmacom 33 machined components like above.

Insulating Crepe Paper from 2 mils to 5 mil thickness in width as desired by the customers.

Insulating Epoxy Diamond Dotted Paper from 3 mils to 5 mil thickness in width from 40 mm upwards.

Insulating Kraft Paper from 2 mils to 5 mil thickness in width as desired by the customers.

Insulating Pressphan Paper in 10 mils & 20 mil thickness in width from 40 mm upwards.

VinCork® Machine Press Board Components Machine components are insulation used in oil-filled power & distribution transformers. They come in various forms like spacers, strips, ducts, rings, phase barriers, yokes, etc.

Pristine Technologies & Industries manufactures them using two kinds of press boards of ABB India Ltd - ' Raman Boards ' make :

Sigmacom 3.1: Recommended for transformer ratings from 33 kV to 220 VK class.

Sigmacom 33: Recommended for transformer ratings of 11 kV & 33 VK class.