What are the steps to measure the insulation resistance of a lightning arrester?
Use dry, clean and soft cloth to wipe off the dirt on the surface of the insulating surface of the sample, and wash it with suitable detergent if necessary
Disconnect the power of the sample, dismantle or disconnect all the external connections, and then discharge the sample to the ground. The insulation rod and other tools are used during the discharge, and the discharge wires shall not be touched by hand
The terminal "megohmmeters on E" is connected with the grounding end of the sample, "L" is connected with the high-voltage side, "G" is connected with shielding terminal. Should use the shielded wire and insulation shielding bar connection. Will the megohmmeter level on the stability, when the speed is megameter in low-speed rotation, wire instantaneous short with "L" and "E" terminals, the pointer should be zero. When open, megohmmeters speed reaches the rated speed of the pointer should refer to quotupquot. Then the megger megger will stop rotating, the grounding terminal is connected with the ground test the high end European table Mega connected shield cable, connect the other end of the line is suspended (not to test), again driving megger or power supply is switched on, the megameter indicate no significant difference. Then the megohmmeter will stop rotating, shielding cable to test measurement site.
