Power cable positioning method for ground faults of sheath layer and armor layer
A technology for power cables and ground faults, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve the problems of ground resistance affecting positioning accuracy and low positioning accuracy, and achieve the effect of avoiding the evolution of single-phase ground faults.
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[0024] see figure 2 , figure 2 It is the wiring diagram of the three-phase voltage measurement method for the cable outdoor terminal. Install voltage transformers on the outdoor terminals of cables. The voltage transformer consists of primary windings 1, 2, 3 and secondary windings 4, 5, 6. The six windings are all three-phase windings, and the primary windings 1, 2, and 3 are respectively the core layer winding, the sheath layer winding, and the armor layer winding. , The cable core layer of C phase, the sheath layer of cable A, B, C phase and the armor layer of cable A, B, C phase, the tail end is grounded after star connection. The secondary windings 4, 5, and 6 are also star-connected, a 1 , b 1 、c 1 The first end and the tail end of the phase winding are connected to 4 voltage signal input terminals of the locator 7; a 2 , b 2 、c 2 The first end and the tail end of the phase winding are connected to 4 voltage signal input terminals of the locator 8; a 3 , b 3...
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