How important is Insulation Resistance Testing.
Insulation resistance testing is very important for low voltage circuit breakers. Harsh temperature excesses and chemical contagion surroundings may add deterioration. The Insulation Resistance Testing is known as a Megger test which is used as a “Spot type” to measure the insulation’s dielectric condition at a given moment in time.
Megger Insulation Tester.
This test is performed by applying a current limited DC test voltage between the conductors and the chassis of the equipment and then it measures any current leakage across the insulation’s di-electrically materials.Test equipment is used to apply an over-voltage to test the integrity of the insulation.
Insulation Resistance Tester.
The main purpose of performing insulation resistance testing-
include-It is used as a quality control measure at the time a piece of electrical equipment is produced.
It is used as a periodic preventive maintenance task
It is used as a troubleshooting tool.
How to perform an Insulation Resistance Test?
Insulations Resistance Test.
By connecting two leads a (positive and negative) across an insulation barrier one can perform an Insulation Resistance Test. A third lead establishes a connection to a guard terminal which can be available with the tester.It allows the person to be selective in evaluating certain specific components in a large piece of electrical equipment.
What affects Insulation Resistance Reading?
Insulation Resistance is temperature-sensitive. When temperature increases, insulation resistance testing decreases and vice versa. So to compare new readings with previous ones, the person requires correcting the readings to some base temperature.
Testing can help an individual to determine whether the insulation is performing at an effective and safe level. Routine testing can identify problems before they result in injury or equipment failure. In case of excessive heat or cold, moisture, vibration, dirt, oil and corrosive vapors these all features give a great contribution to worsening the environment and to solve these problems Insulation Resistance Testing is performed.
