Grounding Diagnosis of Single-core Cable Sheath Based on Pulse Difference
The integrity of sheath insulation of high voltage single-core cable plays an important role in ensuring the design capacity,safe operation and increasing the service life of cable.The on-line monitoring and location of ca-ble sheath insulation is helpful to find the early faults of cable in time,avoid the deterioration of insulation and en-sure the reliability of power supply system.In this paper,the existence of multi-point earthing fault is judged by de-tecting the circulating current of cable sheath,and the pulse reflection method is used to locate the fault point.In or-der to solve the problem of confusion of fault reflection waveform caused by reflection of cable intermediate joint,a method of fault location for cable sheath grounding based on pulse difference method is proposed.The frequency conversion cable model is built in ATP-EMTP,and it is proved that the method can measure the grounding fault dis-tance of cable sheath quickly and accurately.
single core cableprotective layer groundingpulse differenceonline monitoring
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