A method for testing temperature coefficient of insulation resistance of double-layer insulation

Abstract

The present application relates to the technical field of cable insulation core electrical performance test, especially to a kind of double-layer insulation insulation resistance temperature coefficient test method.The method comprises the following steps: preparing double-layer insulation core sample, oven pretreatment is carried out to double-layer insulation core sample, eliminate internal residual stress and moisture interference of sample;Sample surface is wiped with anhydrous alcohol;The sample with assembled electrode is placed on the insulation grid support in the high-low temperature testing machine;Temperature interval is set;DC high voltage is applied to the sample through high-voltage DC power supply and protection resistor;Insulation resistance is calculated according to formula.The present application eliminates internal stress and moisture of sample by 50 DEG C / 24h oven pretreatment, which is consistent with actual sample production process;Surface impurities and cavity leakage interference are eliminated by alcohol surface purification and insulation grid support;Standardized three-electrode winding, constant temperature duration, pressure parameters are used, and test process is unified, with high data repeatability.

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