Analysis of the factors affecting the measurement of power fittings

Analysis of factors affecting the measurement of power fittings the insulation resistance of power fittings will decrease with the increase of temperature, because too high temperature will aggravate the dielectricization of resistance, and then lead to the increase of conductivity and the decrease of resistance.

In addition, when the relative humidity is high, the insulation resistance will absorb more water, which will also increase the conductivity and reduce the insulation resistance.

Insulation resistance measurement is equal to applying DC voltage to the insulation, that is to charge the measured body. After the measurement, the measured body should be fully discharged and the discharge time should be longer than the charging time, so that the charging current and absorption current will not be smaller than the previous measurement value when the residual electricity is not discharged. Therefore, the absorption ratio will decrease and the insulation resistance will increase.