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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

Active Publication Date: 2014-07-09
KGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional DA system relying on the distribution automation master station and the distribution automation terminal, due to the complexity of the system and the characteristics of a wide range of distribution network points, the construction cost is huge; Due to the difference in network structure and switchgear between line and cable network, the complete and optimal application effect cannot be achieved.

Method used

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  • Automatic power distribution network fault judging and controlling method of full-load switch ring main unit power supply
  • Automatic power distribution network fault judging and controlling method of full-load switch ring main unit power supply
  • Automatic power distribution network fault judging and controlling method of full-load switch ring main unit power supply

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Assume that the power distribution cable network is grounded with small resistance, and the circuit breakers CB1 and CB2 of the substation are configured with a definite phase overcurrent protection delay of 0.3 seconds, and a definite time zero sequence overcurrent protection delay of 1.0 seconds. The time delay for the second overlap 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 power distribution automation terminal is equipped with a unified definite time limit phase overcurrent judgment delay: 0.15 seconds, definite time limit zero sequence overcurrent Judgment delay: 0.5 seconds; configure a unified area outside the fault outlet switch to trip after 2 seconds of voltage loss delay, branch line fault branch line switch to trip after 2 seconds of voltage loss delay, non-faulty incoming line switch to trip afte...

Embodiment 2

[0038] Assume that the distribution cable network is: non-grounded or arc-suppression coil grounded, and the substation outlet circuit breakers CB1 and CB2 are configured with a fixed-time phase overcurrent protection delay of 0.3 seconds, and the primary and secondary overlap 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 power distribution automation terminal is equipped with a unified definite time limit phase overcurrent judgment delay: 0.15 seconds, Zero-sequence power direction to judge single-phase ground fault function; configure a unified fault outgoing line switch to trip after 2 seconds of voltage loss delay, branch line fault branch line switch to trip after 2 seconds of voltage loss delay, no fault incoming line switch to trip after 2 seconds of voltage loss ...

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Abstract

The invention relates to an automatic power distribution network fault judging and controlling method of full-load switch ring main unit power supply. When a main line between a switch room 2 and a switch room 3 has faults, a CB1 detects the faults and actively trips; before the CB1 trips, incoming and outgoing line load switches FB1, FB3, FB4 and FB6 detect the faults, branch line load switches FB2 and FB5 do not detect the faults, all load switches of the switch room 3 do not detect the faults, and the outgoing line switches FB 3 and FB6 and an incoming line switch FB 7 lose voltages and then delay tripping to isolate external faults; the transformer substation outgoing line breaker CB1 delays coinciding once, and the outgoing line load switches FB3 and FB6 sequentially have voltages and delay switching on; if lines have the transient faults, then the incoming line switch FB 7 has voltages and delays switching on, the lines coincide successfully, and all-line power supply is restored; if the lines have the permanent faults, the transformer substation outgoing line breaker CB1 detects the faults and then actively trips.

Description

technical field [0001] The invention relates to a method for automatic fault judgment and control of a distribution network powered by a full-load switch ring network cabinet, to be precise, a method for unified management of the ring network cabinet, detection of fault characteristics and specific actions of the cable ring network Logic, an on-site feeder automation method to realize cable network fault location and fault local isolation. Background technique [0002] With the development of the national economy and the continuous improvement of people's material and cultural living standards, economic development and people's life demand for electricity is increasing, which promotes the rapid development of the electric power industry, and the continuous expansion of the power grid. Users have higher and higher requirements for power supply quality and reliability. Higher and higher, even a momentary interruption of the power supply cannot be tolerated. [0003] At presen...

Claims

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Application Information

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IPC IPC(8): H02H7/22H02H7/28
Inventor 霍锦强李嘉添
Owner KGE
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