Method for automatically judging and controlling power distribution network failure in ring main unit power supply

A technology for automatic judgment of distribution network faults, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of different switchgear, high construction cost, failure to achieve application effects, etc., and achieve the effect of moderate investment cost

Active Publication Date: 2014-07-02
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 di

Method used

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  • Method for automatically judging and controlling power distribution network failure in ring main unit power supply
  • Method for automatically judging and controlling power distribution network failure in ring main unit power supply
  • Method for automatically judging and controlling power distribution network failure in ring main unit power supply

Examples

Experimental program
Comparison scheme
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 power distribution automation terminal is equipped with a unified definite time phase overcurrent protection delay: 0.15 seconds, definite time zero sequence overcurrent Protection delay: 0.5 seconds; configured to trip the fault outgoing line switch outside the unified area, the branch line fault incoming line switch trip, the branch line fault branch line switch to trip with a delay of 2 seconds when the branch line loses voltage, and the non-f...

Embodiment 2

[0036] 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 is equipped with a unified definite time phase overcurrent protection delay: 0.15 seconds, Zero-sequence power direction to judge single-phase grounding fault function; configure unified fault outgoing line switch tripping outside the area, branch line fault incoming line switch tripping, branch line faulty branch line switch tripping with a delay of 2 seconds when the branch line loses voltage, and a non-faulty incoming line switch to trip after losing vo...

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PUM

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Abstract

The invention relates to a method for automatically judging and controlling power distribution network failure in ring main unit power supply. According to the method, when failure occurs on a main line between a switch room 2 and a switch room 3, incoming and outgoing breakers MB1, MB3, MB4 and MB6 detect the failure, branch line load switches MB2 and MB5 do not detect the failure, the outgoing breakers MB3 and MB6 trip out proactively to isolate the failure outside, the switch room 3 only detects loss of voltage, and tripping of an incoming breaker MB7 is delayed; the outgoing breakers MB3 and MB6 detect voltage sequentially, and switching-on of the outgoing breakers MB3 and MB6 is delayed; when the line failure is transient failure, switching-on of the incoming breaker MB7 is delayed under voltage later, line connection succeeds, and power supply is recovered for the whole line; when the line failure is permanent failure, the outgoing breaker MB6 is closed to the failure and trips out quickly to isolate the failure; the outgoing breaker MB3 is not closed to the failure and trips out in a locked mode; the incoming breaker MB7 detects residual voltage and is switched on in a locked mode.

Description

technical field [0001] The invention relates to a method for automatic fault judgment and control of a distribution network powered by a ring network cabinet, to be precise, a method for realizing the unified management of the ring network cabinet, the detection of fault characteristic quantities and the specific action logic of the cable ring network. On-site feeder automation method for 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 pr...

Claims

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Application Information

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