Automatic power distribution network fault judging and controlling method of full-load switch ring main unit power supply
A distribution network fault and load switch technology, applied in the direction of electrical components, emergency protection circuit devices, etc., can solve the problems of different and complex switchgear, failure to achieve the application effect, etc., and achieve the effect of moderate investment cost
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[0023] Example 1
[0024] Assuming that the distribution cable network is grounded with small resistance, the substation outlet circuit breakers CB1 and CB2 are configured with definite phase overcurrent protection delay: 0.3 seconds, and the definite zero sequence overcurrent protection delay is 1.0 second, once, twice The time delay for each reclose is 5 seconds. At this time, the ring network cabinet needs to be equipped with three-phase current transformers, zero sequence current transformers, and incoming and outgoing line voltage transformers; the distribution automation terminal is equipped with a unified time limit phase overcurrent determination delay: 0.15 seconds, time limit zero sequence overcurrent Judgment delay: 0.5 seconds; configuration of the failure outgoing switch outside the unified area to trip with 2 seconds of voltage loss delay, branch line failure of the branch line switch to trip with 2 seconds of voltage delay, no failure of the incoming switch to trip...
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[0037] Example 2
[0038] Assuming that the distribution cable network is: non-grounding or arc suppression coil grounding, the substation outlet circuit breakers CB1 and CB2 are configured with time-limited phase overcurrent protection. The delay is: 0.3 seconds, and the first and second reclosing delays are both: 5 seconds. . At this time, the ring network cabinet needs to be equipped with three-phase current transformers, zero sequence current transformers, zero sequence voltage transformers, and incoming and outgoing line voltage transformers; the distribution automation terminal is equipped with a unified time limit phase overcurrent determination delay: 0.15 seconds, Zero-sequence power direction judgment single-phase grounding fault function; equipped with a unified external fault outlet switch failure delay of 2 seconds to trip, branch line failure branch line switch failure delay of 2 seconds to trip, no failure of incoming line switch failure of voltage delay of 2 secon...
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