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Insulation resistance tester inspection

time:2020/10/24   source:华天电力  reading:226 time

The current does not always reach its intended destination. Even with intact functional insulation, current will be lost all the way. In the real world, there is not always an intact functional insulation. Insulating materials will wear out due to heat, cold, vibration, dust and similar forces. Routine testing allows you to understand whether the electrical system is operating as effectively and safely as expected, and helps you identify problems before they occur.


Insulation resistance test can provide you with a quantifiable figure to estimate the conductor insulation condition inside various electrical equipment. It will apply current to the system to be tested, some of which will charge the internal insulation. When the electron finds itself stored in the insulating material, the resistance reading on the meter will gradually increase. Your reading (in megaohms) will tell you how fast the insulation is charging.


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Diagnostic role of current


Different testers may apply a variety of different currents, each of which has its own diagnostic purpose. Capacitive current is the initial charge of the current when a voltage is first applied. The charge absorption is high at the beginning, but slowly decreases as the voltage increases, and the absorption inside the insulation decreases. This makes capacitive current an important reflection of energy storage in insulation.


However, polarization or current will also be absorbed, depending on the degree of damage to the insulating layer you want to check. If the insulating layer is damaged by moisture, the current absorbed will rise sharply. However, it takes longer to establish the polarization current, so a short test using capacitive current may not reveal potential pollution problems.


For the most accurate maintenance and troubleshooting applications of insulation resistance testers (also called digital insulation resistance meters), in addition to capacitive charge testing, you also need polarization and absorption testing. Some resistance testers have the ability to perform tests using all of these types of currents, while others are dedicated to testing only one type.


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