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Analysis of Factors Affecting the Measurement of Electric Power Fittings

1. The insulation resistance will decrease with the increase of temperature. This is because too high temperature will increase the dielectricization of the resistance, which in turn will lead to an increase in conductance and a decrease in resistance.

2. Moisture absorption on the surface of the insulation resistance or the formation of a water film on the porcelain insulation surface will also reduce the insulation resistance. In addition, when the insulation resistance is relatively humid, it will absorb more moisture, which will also increase the electrical conductivity and reduce the insulation resistance.

3. Insulation resistance measurement is equal to applying a DC voltage to the insulation, that is, charging the measured body. After the measurement, the measured body should be fully discharged and the discharge time must be longer than the charging time so that it will not be repeated because the remaining power is not discharged. The charging current and the absorption current obtained during the measurement are smaller than the previous measurement, so the absorption ratio is reduced and the insulation resistance value is increased. The power fitting manufacturer here confirms that the factor that can affect the insulation resistance measurement result of the power fitting is mainly caused by the discharge It is caused by time, temperature and humidity!