Relay protection method and relay protection device for quickly removing dead zone faults of air-charging transformer

A relay protection and dead zone protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of non-action or delayed action of differential protection, and achieve the effect of improving reliability and high protection sensitivity

Active Publication Date: 2020-05-01
NARI TECH CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Invention patents 201310641842.0 and 201410039071.2 propose a method for removing transformer dead-zone faults. When a dead-zone fault occurs on one side of the transformer, TA on that side exits the differential protection, making the transformer differential protection trip the circuit breakers on eac

Method used

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  • Relay protection method and relay protection device for quickly removing dead zone faults of air-charging transformer
  • Relay protection method and relay protection device for quickly removing dead zone faults of air-charging transformer
  • Relay protection method and relay protection device for quickly removing dead zone faults of air-charging transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A relay protection method for quickly cutting off the fault of transformer empty charging in the dead zone, including the following control process:

[0058] In the fast trip control of the transformer empty charging in the dead zone fault, the following conditions are set:

[0059] (1) The circuit breakers on each side of the transformer are in the open position, and the current on one side changes from no flow to flow and the circuit breaker on this side changes from partial to closed, then the transformer is in the state of empty charging from this side;

[0060] (2) The transformer is empty-charged, and the dead zone protection is opened for T seconds;

[0061] (3) The circuit breaker on a non-empty charging side of the transformer is in the opening position;

[0062] (4) Among the three-phase currents on the non-empty charging side, the maximum phase current is greater than the current setting value, or the zero-sequence current is greater than the zero-sequence s...

Embodiment 2

[0067] A relay protection device for quickly cutting off the fault of transformer empty charging in the dead zone, including:

[0068] The condition judging module is used to judge whether the fast tripping control condition of the transformer empty charging in the dead zone fault is established; the control condition of the transformer empty charging in the dead zone fault fast tripping control condition is:

[0069] (1) The circuit breakers on each side of the transformer are in the open position, and the current on one side changes from no flow to flow and the circuit breaker on this side changes from partial to closed, then the transformer is in the state of empty charging from this side;

[0070] (2) The transformer is empty-charged, and the dead zone protection is opened for T seconds;

[0071] (3) The circuit breaker on a non-empty charging side of the transformer is in the opening position;

[0072] (4) Among the three-phase currents on the non-empty charging side, th...

Embodiment 3

[0077] According to the typical parameters of 220kV power transformer, the transformer protection dead zone fault test model is established on the real-time digital simulation system (RTDS). The main wiring diagram and fault point settings of the RTDS system are as follows: image 3 As shown, the RTDS system parameters are shown in Table 1:

[0078] Table 1, System Parameters

[0079]

[0080] Based on the RTDS model, when the high voltage side of the simulated transformer is empty-charged, various types of dead zone faults occur at the medium-voltage side K2 point and the low-voltage side K3 point; Various types of dead zone faults, assess the action behavior and action time of the protection device.

[0081] Empty charge on the high voltage side, dead zone fault on the medium voltage side:

[0082] serial number Fault type action time action message 1 K2AN CD 132.00ms 125ms medium voltage side dead zone protection action 2 K2B CD 132.80...

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PUM

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Abstract

The invention discloses a relay protection method and device for quickly removing dead zone faults of an air-charging transformer. The method comprises control processes of enabling circuit breakers at all sides of a transformer to be located at an opening position, enabling a current at one side to be changed from no current to current, enabling the circuit breaker at the side to be changed froman opening position to a closing position, and enabling the transformer to be in an air-charging state from the side; performing empty charging of the transformer, and opening dead zone protection forT seconds; enabling a certain non-air-charging side circuit breaker of the transformer to be located at the opening position; wherein the maximum phase current in the non-empty charging side three-phase current is greater than a current setting value, or a zero-sequence current is greater than a zero-sequence setting value, or a negative-sequence current is greater than a negative-sequence setting value; when the conditions are met, a transformer differential protection tripping action outlet loop is started after t1 is delayed, circuit breakers on all sides of the transformer are tripped off, and dead zone faults are rapidly removed. The method is advantaged in that influence of inrush current during empty charging of the transformer is avoided, the method is irrelevant to the transformer backup protection setting value, a transformer type and a fault type, and the dead zone fault removal time is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of relay protection of electric power systems, in particular to a relay protection method and device for quickly cutting off a transformer empty-charging fault in a dead zone. Background technique [0002] Transformer dead zone fault refers to the short-circuit fault that occurs between the circuit breaker on one side of the transformer and the current transformer on this side used for differential protection of the transformer (see figure 2 ), the fault in the dead zone is a fault at the transformer outlet, the fault current is large, and the impact on the transformer is large, and the fault is outside the range of differential protection of the transformer. The fault cannot be isolated, and the fault can only be removed when the backup protection action on the power supply side or the backup protection action on this side trips the circuit breakers on each side of the transformer. [0003] Empty charging ...

Claims

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Application Information

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IPC IPC(8): H02H7/04H02H7/045
CPCH02H7/04H02H7/045
Inventor 龙锋吴通华王小红潘书燕戴魏汤大海刘小宝万洛飞赵瑞辰王中浪朱翔耿华
Owner NARI TECH CO LTD
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