What are the insulation resistances that the transformer needs to test?
The three-phase transformer usually only measure the insulation resistance of the high voltage side and the low voltage side (neutral grounding should be temporarily dismantled), and measure the absorption ratio when necessary. The general standard for insulation resistance is not less than 1 megabits per kilovolt voltage. 110kV is no less than 110 megabytes (strictly speaking, the relative voltage is less than 64kv, as long as it is greater than 64 megabytes).
1. measuring the core insulation and iron core insulation resistance.2. measure the insulation resistance, absorption ratio and polarization index of the winding together with the bushingWhen the absorption ratio is not less than 1.3 at room temperature, the insulation resistance value of one minute is greater than 3G ohm, and the absorption ratio can not be considered
The three-phase transformer usually only measure the insulation resistance of the high voltage side and the low voltage side (neutral grounding should be temporarily dismantled), and measure the absorption ratio when necessary. The general standard for insulation resistance is not less than 1 megabits per kilovolt voltage. 110kV is no less than 110 megabytes (strictly speaking, the relative voltage is less than 64kv, as long as it is greater than 64 megabytes). AC voltage test, AC 1 minutes (10KV to 35KV).
