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What is insulation resistance and its function

time:2020/9/17   source:华天电力  reading:234 time

There is an insulation resistance test in the safety inspection of power equipment. Here we briefly explain what is insulation resistance and what is the function of insulation resistance?


Insulation Resistance Tester.png


The so-called insulation resistance is the ratio of the applied DC voltage to the steady-state current when the current in the insulating medium decays with time and finally reaches stability under the action of the DC voltage. Insulation resistance can reflect the insulation state of electrical equipment to a certain extent (such as the moisture content of the insulating medium and the cleanliness of the surface). Insulation resistance is greatly affected by temperature and humidity and should be measured when the weather is fine.


The measuring range of the insulation resistance tester can reach 0~400GΩ. Large capacity, strong anti-interference, pointer and digital synchronous display, AC and DC dual use, simple operation, automatic calculation of various insulation indicators (absorption ratio, polarization index), various measurement results have the characteristics of anti-power failure. It is an ideal testing instrument for measuring the insulation resistance of large-capacity transformers, transformers, generators, high-voltage motors, power capacitors, power cables, lightning arresters, etc.


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