Automatic reclosing method for multiphase faults of extra-high-voltage common-tower double-circuit transmission line

A technology of automatic reclosing and double circuits on the same tower, applied in the direction of automatic disconnection of emergency protection devices, circuit devices, emergency protection circuit devices, etc. Considering the particularity of simultaneous faults of two circuits, etc., to avoid unsuccessful reclosing and improve the success rate

Active Publication Date: 2012-07-11
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] There are obvious shortcomings in the conventional single-phase reclosing scheme: the double-circuit line on the same tower is treated as two independent circuits, and the particularity of the simultaneous failure of the two circuits is not considered;
[0010] When a single-phase fault occurs in two circuits at the same time, the submerged power supply current is significantly larger than that in the case of only one circuit fault, and the extinguishing time of the submerged power supply arc is longer, and the conventional reclosing scheme may cause the failure of the reclosing of the two circuits

Method used

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  • Automatic reclosing method for multiphase faults of extra-high-voltage common-tower double-circuit transmission line
  • Automatic reclosing method for multiphase faults of extra-high-voltage common-tower double-circuit transmission line
  • Automatic reclosing method for multiphase faults of extra-high-voltage common-tower double-circuit transmission line

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Embodiment 1

[0029] The multi-phase fault automatic reclosing method of the UHV double-circuit line on the same tower in this embodiment includes the following steps:

[0030] 1) Detection system double circuit failure;

[0031] 2) According to the detection result of step 1), when it is detected that the failure of one phase of each of the two circuits of the system occurs simultaneously, the protection action will cause the three-phase trip of one circuit and the faulty phase of the other circuit to trip, and the single-phase trip circuit will start after time T1 Single-phase reclosing;

[0032] 3) Then after T2, the three-phase trip circuit performs three-phase closing to put the line back into operation.

[0033] T1 is 0.8 seconds, single-phase tripping means single-phase tripping of circuit breakers on both sides of the fault phase, and three-phase tripping means three-phase tripping of circuit breakers on both sides of the fault phase.

Embodiment 2

[0035] The multi-phase fault automatic reclosing method of the UHV double-circuit line on the same tower in this embodiment includes the following steps:

[0036] 1) Detection system double circuit failure;

[0037] 2) According to the detection result of step 1), when it is detected that the failure of one phase of each of the two circuits of the system occurs simultaneously, the protection action will cause the three-phase trip of one circuit and the faulty phase of the other circuit to trip, and the single-phase trip circuit will start after time T1 Single-phase reclosing;

[0038] 3) Then after T2, the three-phase trip circuit performs three-phase closing to put the line back into operation.

[0039] T1 is 1.5 seconds.

[0040] Single-phase tripping refers to single-phase tripping of circuit breakers on both sides of the fault phase, and three-phase tripping refers to three-phase tripping of circuit breakers on both sides of the fault phase.

Embodiment 3

[0042] The multi-phase fault automatic reclosing method of the UHV double-circuit line on the same tower in this embodiment includes the following steps:

[0043] 1) Detection system double circuit failure;

[0044] 2) According to the detection result of step 1), when it is detected that the failure of one phase of each of the two circuits of the system occurs simultaneously, the protection action will cause the three-phase trip of one circuit and the faulty phase of the other circuit to trip, and the single-phase trip circuit will start after time T1 Single-phase reclosing;

[0045] 3) Then after T2, the three-phase trip circuit performs three-phase closing to put the line back into operation.

[0046] Among them, T1 is 1 second, single-phase tripping means single-phase tripping of circuit breakers on both sides of the fault phase, and three-phase tripping means three-phase tripping of circuit breakers on both sides of the fault phase.

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Abstract

The invention relates to an automatic reclosing method for multiphase faults of an extra-high-voltage common-tower double-circuit transmission line, which comprises the following steps that: 1) faults of double circuits of a system are detected; 2) according to detecting results obtained in the step 1), when a situation that the double circuits of the system simultaneously respectively have a one-phase fault is detected, a protection action is performed, so that a circuit is subjected to three-phase tripping, the other circuit is subjected to fault-phase tripping, and a time T1 later, a single-phase tripping circuit is subjected to single phase reclosing; and 3) a time T2 later, a three-phase tripping circuit is subjected to three-phase closing, so that the line is put into operation again. By using the method disclosed by the invention, a situation that double circuits trip off in case the reclosing of the double circuits is not successful can be effectively avoided, thereby improving the safety and reliability of the system.

Description

technical field [0001] The invention relates to a high-voltage line, in particular to a multi-phase fault automatic reclosing method for a high-voltage double-circuit line on the same tower. Background technique [0002] In EHV and UHV systems, in order to improve the reliability of power supply, fast single-phase automatic reclosing is often used. When a single-phase instantaneous fault occurs in the system, the faulty phase circuit breaker trips and the fault is removed, due to the coupling effect of mutual inductance and capacitance between phases, the removed faulty phase still flows a certain value of grounding current at the fault point, which is latent. Supply current, which appears in the form of arc light, also known as submerged arc. [0003] When a fault occurs in the two circuits of the UHV double-circuit line on the same tower, such as figure 1 As shown, due to the coupling effect between the two circuits, the submerged supply current is very large at this tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/06
Inventor 韩彬范越班连庚张震宇张媛媛项祖涛牛栓保王康平王晓彤宋瑞华郑彬韩亚楠杜宁周佩朋
Owner CHINA ELECTRIC POWER RES INST
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