NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Tester
EHV cable sheath fault test technology The operation mode of EHV cable (single-core cable) stipulates that the sheath (or sheath, shielding layer) can only be grounded at a single point to eliminate the formation of induced voltage and circulating current. Two schemes are usually used for single-point grounding of sheath: EHV cable sheath fault test technology Ultra-high voltage cable (single-core cable) operating mode regulations: sheath (or sheath, shield) can only be grounded at a single point to eliminate It induces the formation of voltages and circulating currents. Two schemes are usually used for single-point grounding of the sheath: (1) When the cable length is short, one end is directly grounded, and the other end is grounded through the sheath voltage protector; (2) When the cable is long, one end is directly grounded, and the other end is grounded. Use cross-connect method.
The fault of the EHV cable sheath is a ground fault, that is, there is a second grounding point. The traditional methods are: bridge method for distance measurement, acoustic measurement method or step voltage method for positioning. Due to the great influence of the environment, the fixed-point effect of the acoustic measurement method or the step voltage method is not good, which is time-consuming and labor-intensive.
GDBN-015 EHV cable sheath fault tester is a new principle of EHV cable sheath fault location device, which is mainly used for fast and accurate location of metal sheath grounding faults of various single-core EHV cables of 35kV and above. Compared with the traditional bridge method, it does not need a reference loop and does not need a ratio calculation! Compared with the traditional acousto-magnetic synchronous acoustic measurement point, it is not disturbed by ambient audio noise! Compared with the traditional step voltage method, which is limited to the fixed point of the directly buried cable, this device is suitable for various cable laying conditions! Three functions of pre-positioning, path and fixed point in one! 1. Device composition and function 015 When locating the fault of the high-voltage bridge: the high-voltage source and the faulty cable to be tested are reliably connected to form the high-voltage shock circuit of the system; When locating the fault: the intelligent visual and noise-free fixed point instrument detects the oscillating wave signal along the cable to be tested, according to the LCD Chinese display Intuitively determine the location of the fault point.
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