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Method for Automatic Fault Judgment and Control of Distribution Network Powered by Full Circuit Breaker Ring Main Unit

A technology for automatic judgment of power distribution network faults. It is applied to fault locations, electrical components, emergency protection circuit devices, etc. It can solve the problems of different switchgear, large construction cost and complexity, and achieve the effect of moderate investment cost.

Active Publication Date: 2016-09-28
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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  • Method for Automatic Fault Judgment and Control of Distribution Network Powered by Full Circuit Breaker Ring Main Unit
  • Method for Automatic Fault Judgment and Control of Distribution Network Powered by Full Circuit Breaker Ring Main Unit
  • Method for Automatic Fault Judgment and Control of Distribution Network Powered by Full Circuit Breaker Ring Main Unit

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Assume that the distribution cable network is: small resistance grounding method, the substation outlet circuit breakers CB1 and CB2 are configured with a definite time limit phase overcurrent protection delay: 0.3 seconds, a definite time limit zero sequence overcurrent protection delay time: 1.0 seconds, a reclosing delay Time: 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 switch room is equipped with a unified definite time limit phase overcurrent protection delay: 0.15 seconds, definite time zero sequence Delay of over-current protection: 0.5 seconds; configured with a unified fault outgoing line switch tripping outside the area, branch line fault branch line switch tripping, no fault incoming line switch tripping with a delay of 2 seconds for voltage loss, and closing for 5 secon...

Embodiment 2

[0034]Assuming that the distribution cable network is: ungrounded or arc-suppression coil grounded, substation outlet circuit breakers CB1 and CB2 are configured with a definite phase overcurrent protection delay of 0.3 seconds, and a reclosing delay of 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 switch room is equipped with a unified definite time limit phase overcurrent protection delay: 0.15 Seconds, zero-sequence power direction to judge single-phase grounding fault function; configure a unified fault outgoing line switch trip outside the area, branch line fault branch line switch trip, no fault incoming line switch trip after 2 seconds of voltage loss, and close after 5 seconds when one side has voltage delay. One side of the contact switch lo...

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Abstract

The invention relates to an automatic power distribution network fault judging and control method of full-breaker ring main unit power supply. When a main line between a switch room 2 and a switch room 3 has faults, incoming and outgoing breakers MB1, MB3, MB4 and MB6 detect the faults, branch breakers MB2 and MB5 do not detect the faults, the outgoing breakers MB3 and MB6 actively trip to isolate the external faults, the switch room 3 only detects voltage loss, and an incoming breaker MB7 delays tripping; the outgoing breakers MB3 and MB6 sequentially detect voltages and delay switching on; when lines have transient faults, the incoming breaker MB7 has voltages and delays switching on, the lines successfully coincide, and all-line power supply is restored; when the lines have permanent faults, the outgoing breaker MB6 is close to the faults and trips to rapidly isolate the faults; the outgoing breaker MB3 is not close to the faults, locking out and trips.

Description

technical field [0001] The invention relates to a method for automatic fault judgment and control of a distribution network powered by a circuit breaker ring network cabinet, to be precise, a method for unified management of the ring network cabinet, fault feature detection and specific action 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 present, my country...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 霍锦强李嘉添
Owner KGE
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