In the partial discharge detection of long-distance XLPE power cable

the partial discharge signal of the defect phase will flow into the cable jacket of other two phases due to the existence of cable jacket cross-interconnect structure

making the signal detection and analysis be very difficult.For determining the position and phase of the discharge source

the time domain characteristic and the law of distribution change of the signal at positions of different detection point are simulated and analyzed by way of simulation modeling of the XLPE cable cross-bonding system with combination actual measurable point during the live detection period.The study results show that the pulse time domain characteristics of different detection points are quite different

which are closely related to the position of the discharge source and the grounding form of the joint.Selection of appropriate detection points and comprehensive comparison of the signal of each detection point can judge effectively the joint and phase where the power supply is located.