220kv transformer dead-zone fault removing method

A fault removal and transformer technology, applied to electrical components, emergency protection circuit devices, etc., can solve problems such as transformer damage, long backup protection action time limit, and fault existence, so as to meet the requirements of relay protection devices and improve the protection action speed Effect

Inactive Publication Date: 2016-11-16
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the bus differential protection on this side or the backup protection on this side of the transformer trips the circuit breaker on this side of the 220kv transformer, the fault still exists. These faults are only removed by the backup protection on the power supply side of the transformer, but the time limit for the backup protection is relatively long. It is the failure of the transformer outlet, which is easy to cause damage to the transformer

Method used

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  • 220kv transformer dead-zone fault removing method
  • 220kv transformer dead-zone fault removing method
  • 220kv transformer dead-zone fault removing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the transformer dead zone fault removal method, the steps are as follows:

[0029] 1. Analyze the fault characteristics

[0030] When a dead zone fault occurs on one side of the transformer, the fault feature is that the bus differential protection on this side does not return; if there is no bus differential protection on this side, the backup protection on this side of the circuit breaker on the 220kv transformer side does not return, and the 220kv transformer There is still a fault current flowing through TA on this side;

[0031] 2. According to the fault characteristics, the judgment conditions are put forward:

[0032] (1) The backup protection trip outlet on this side of the transformer, the relay is in the action state, or the trip outlet of other protection (this embodiment is the bus differential protection on this side), the relay is in the action state;

[0033] (2) The A-phase or B-phase or C-phase current on this side of the t...

Embodiment 2

[0037] Such as figure 2 As shown, the transformer dead zone fault removal method, the steps are as follows:

[0038] 1. Analyze the fault characteristics

[0039] When a dead zone fault occurs on one side of the 220kv transformer, its fault characteristics are the same as in Embodiment 1;

[0040] 2. According to the fault characteristics, the judgment conditions are put forward:

[0041] (1) The backup protection trip outlet on this side of the transformer, the relay is in the action state; or the trip outlet of other protections (this embodiment is the bus differential protection on this side), the relay is in the action state;

[0042] (2) The A-phase or B-phase or C-phase current on this side of the transformer is greater than the setting value; or the zero-sequence current or negative-sequence current is greater than the setting value;

[0043] 3. Action after judgment

[0044] When the two conditions are all satisfied, after a delay of 8ms-10ms, the tripping circuit...

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Abstract

A 220KV transformer dead-zone fault removal method that can prevent the fault from being removed for a long time and damage the transformer. The technical solution is: analyze the fault characteristics; state; or other protection trip outlets, the relay is in action; 2) The current of phase A or B or C on the side of the transformer is greater than the set value, or the zero-sequence current or negative-sequence current is greater than the set value; when the above two conditions are all met , exit the transformer differential protection TA on this side of the transformer after a delay, that is, the current on this side of the transformer does not participate in the calculation of the differential protection current of the transformer; TA, that is, the current on this side of the transformer participates in the calculation of the transformer differential protection current.

Description

technical field [0001] The invention relates to a method for removing faults in the dead zone of a 220KV transformer. Background technique [0002] At present, the microcomputer transformer protection is divided into four parts: differential protection, backup protection, failure protection and body protection. Among them, the differential protection is the main protection of the transformer, which can respond sensitively and quickly to various faults within its protection range. When a fault occurs between the current transformers and circuit breakers on each side of the 220kv transformer, the fault is outside the differential protection range of the transformer, but within the differential protection range of the bus on the fault side. Although the bus differential protection on this side or the backup protection on this side of the transformer trips the circuit breaker on this side of the 220kv transformer, the fault still exists. These faults are only removed by the back...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 王海洋陈天弼孟祥博李效宇李云陟
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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