Abstract：Based on the ethylene-propylene rubber (EPR) DC feeder cable laying method to carry out the DC feeder cable insulation crack discharge test, and the discharge signal detection cable insulation fault crack damage in the feasibility is studied. Experimental results show that due to the low operating voltage, insulation good DC feeder cable can not detect discharge signal, when the cable insulation crack occurs, the buried cable would happen tracking discharge under certain conditions; spanned cable, when a smaller cable insulation damage, would happen tracking discharge similarly to buried cable's, insulation damage is large (cable core exposed) would happen pull-arc discharge. Buried cable feasibility simulation results show that the cable tracking discharge phenomenon and its insulation crack has a good correlation, and could be an early warning of the insulation crack damage, but also with the external environment-related. Prone to soil moisture-hour discharge, soil moisture is large and difficult to discharge, and would have a greater DC leakage current; only comprehensive monitoring DC leakage current and discharge signals can effectively monitoring DC feeder cable insulation crack fault.
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