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There are some problems in the operation of distance protection, such as bad operation and maintenance, design, manufacture and the principle defect of the device, etc. . When the single-phase through-wall bushing breaks down and develops into a three-phase fault, due to the misplacing of the fixed value position of the distance protection section I, the whole substation will be stopped by jumping the adjacent lines. During by-pass operation, the three-phase voltage is unbalanced due to the earthing of the open damping resistance of the TV, which causes the misoperation of the distance protection outlet. Due to poor insulation, the two coils of the relay QHJ were short-circuited, which caused the misoperation of the inter-phase I section of distance protection. Misoperation of distance protection is caused by poor insulation of miniature intermediate relay. The circuit breaker was tripped due to the grounding of the TJR terminal in the operation box. DUE TO TA polarity reverse connection, misoperation of distance protection is caused when single-phase-to-ground fault occurs on transmission line.

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夕陽所以無限好，全靠著近黃昏。--梁遇春《寄給一個失戀的人》 

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5730048-CA DSAI 130

RF185

57160001-TZ DSTD 110
57160001-UD DSTD 120
57160001-UH DSTD 150
57160001-UNC DSTD 150B
57160001-UNG DSTD 110B
57160001-UNL DSTD W120A
57160001-UY DSDI 110F
57160001-UZ DSDI 120
57160001-VG DSFS 401
57160001-YX DSTD W130
57160001-ZB DSTD W120
57160001-ZL DSTD W113
57170001-A DSXS 001
5730030-A DSAI 110
5730030-F DSAI 130
5730030-UN DSAO 110
5730030-UP DSAO 120
5730030-UR DSAO 130
5730030-US DSDP 110
5730032-BC DSAX 110
5730032-BE DSDI 110
5730032-H DSTK 151V
5730048-CA DSAI 130

57120001-LK DSTY 110
57120001-MZ DSTA 191
57120001-NH DSTA 145A
57120001-NT DSAI 130H

5730048-CA DSAI 130 由【廈門興銳嘉進出口有限公司】優惠供應.