1. INSULATION RESISTANCE MEASUREMENT TEST
Insulation resistance of the Lightning Arrester is to be taken for checking the healthiness of LA. IR of the LA need to check stack wise, i.e. top stack, middle stack, bottom stack etc. as per the number of stacks available in LA with the help of 5 KV motorized megger. For example if any LA has 3 stacks then we need to take 6 readings, of each stack and each stack to earth. The value should come more than 10000 Mohm.
2. SURGE COUNTER TEST
This test is done by providing single phase supply to the surge counter. In this phase is connected for small moment to point where the output of LA is connected to surge counter through cable and neutral of supply is connected to earth point of surge arrestor. Neutral is fixed permanently to earth point and phase is connected for instance. By doing so LA leakage current get increases and counter of LA get incremented. This shows the healthiness of counter.
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