The Influence of Residual Charge on Insulation Resistance Test
The residual charge of large capacity equipment has a significant impact on the insulation resistance test results,which lead to misjudgment.In this paper,the influence mechanism of residual charge on insulation resistance measurement is illustrated by means of simulation calculation,theoretical analysis and experimental analysis.When the polarity of the residual charge is the same as that of the test power supply,the absorbed current value is smaller and the insulation resistance value is larger.When the polarity of the residual voltage is opposite to that of the test power supply,the absorbed current value is larger and the insulation resistance value is smaller.The greater the amount of residual charge,the more significant the effect.The research in this paper is helpful to deepen the understanding of the electrical workers to the residual charge and guide the insulation resistance measurement.
Large capacity power equipmentResidual chargePolarityCircuit simulationCircuit theorem
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