Why measure the insulation resistance of 10KV cable? Why use 5000V meter?
Strictly speaking, measurement of 10KV cable for 5000V tramegger is not to judge whether this cable to meet the requirements of the use of 5000V, just use the shaking table test of the existence of cable insulation weak points, the real decision whether to cable insulation resistance meter measurement with professional pressure requirements, and meet the requirements to allow the use of charged numerical.
Nor is it expected to use 5000v voltage to break down the insulation. Therefore, the regulations specify that the 1000V or 2500V shake shall be used for high voltage equipment above 250V. The actual voltage test requires a dedicated test instrument with a voltage of 2-3 times the nominal voltage.
The power system does not specify that the 10kV cable must be measured using the 5000v shake table. The purpose of measuring insulation is to judge whether there is an obvious fault in the equipment under test, so the insulation can only be judged as "bad" and can not be judged "well"".
