Distance relay for reflecting single-phase ground short circuit and movement method and device

A distance relay and action technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of complex calculation of distance relay phase comparison criteria

Inactive Publication Date: 2016-04-20
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the embodiments of the present invention is that the calculation of the phase comparison criterion of the distance relay responding to single-phase ground short circuit in the prior art is complicated

Method used

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  • Distance relay for reflecting single-phase ground short circuit and movement method and device
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  • Distance relay for reflecting single-phase ground short circuit and movement method and device

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Experimental program
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Effect test

Embodiment 1

[0048] This embodiment provides a distance relay action method, for example, it is applied to a distance relay that responds to a single-phase ground short circuit, such as figure 1 shown, including the following steps:

[0049] S1. Obtain the comparison amount of the action criterion, which includes the voltage phasor of the bus voltage of the phase where the relay is located zero sequence current phasor negative sequence current phasor and the compensation voltage vector in Indicates the phase of the distance relay, which is a, b or c;

[0050] S2. Calculate θ respectively according to the following formula 1 , θ 2 , θ 3 and θ 4 :

[0051] S3, respectively judge 0°≤θ 1 ≤180°, 180°≤θ 2 ≤360°, 0°≤θ 3 ≤180° and 180°≤θ 4 Whether ≤360° holds true; when 0°≤θ 1 ≤180°, 180°≤θ 2 ≤360°, 0°≤θ 3 ≤180° and 180°≤θ 4 When ≤360°, go to step S4; otherwise, go to step S5.

[0052] S4. Generate a signal for operating the distance relay.

[0053] S5. Generate a signa...

Embodiment 2

[0058] Corresponding to the above-mentioned embodiment 1, this embodiment provides a distance relay operating device, such as figure 2 shown, including:

[0059] The acquisition unit 41 is used to acquire the comparative amount of the action criterion, and the comparative amount of the action criterion includes the bus voltage phasor of the phase where the distance relay is located zero sequence current phasor negative sequence current phasor and the compensation voltage vector in Indicates the phase of the distance relay, which is a, b or c;

[0060] Calculation unit 42, for calculating θ respectively according to the following formula 1 , θ 2 , θ 3 and θ 4 :

[0061] Judging unit 43, used to judge 0°≤θ respectively 1 ≤180°, 180°≤θ 2 ≤360°, 0°≤θ 3 ≤180° and 180°≤θ 4 Whether ≤360° is established;

[0062] Action signal generating unit 44, used for when 0°≤θ 1 ≤180°, 180°≤θ 2 ≤360°, 0°≤θ 3 ≤180° and 180°≤θ 4 When ≤360°, generate a signal to activate th...

Embodiment 3

[0067] This embodiment provides a distance relay that responds to a single-phase ground short circuit, such as image 3 shown, including:

[0068] Voltage transformer 1, used to receive three-phase voltage and The three-phase voltage and Convert into a voltage suitable for the A / D converter 3 and output it;

[0069] Current / voltage converter 2 for receiving three-phase current and The three-phase current and Convert into a voltage suitable for the A / D converter 3 and output it;

[0070] The A / D converter 3 is used to convert the received voltage output by the voltage transformer 1 and the current / voltage converter 2 into a digital quantity and output it;

[0071] Processor 4 comprises a distance relay operating device, and the distance relay operating device includes:

[0072] The acquisition unit is used to acquire the comparison quantity of the action criterion according to the digital quantity output by the A / D converter 3, and the comparison quantity of t...

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Abstract

The invention discloses a method and device for movement of a distance relay and the distance relay for reflecting a single-phase ground short circuit. The method comprises the following steps of obtaining movement criterion comparative quantity, calculating theta 1, theta 2, theta 3 and theta 4 respectively, and judging whether it is true that 0 degree<=theta1<=180 degrees, 180 degrees<=theta 2<=360 degrees, 0 degree<=theta 3<=180 degrees and 180 degrees<=theta 4<=360 degrees; when 0 degree<=theta1<=180 degrees, 180 degrees<=theta 2<=360 degrees, 0 degree<=theta 3<=180 degrees and 180 degrees<=theta 4<=360 degrees, generating signals for enabling the distance relay to move. According to the method and device for movement of the distance relay and the distance relay for reflecting the single-phase ground short circuit, the phase comparison criterion is simple, the reliability is high, and the distance relay has very high transition resistance resisting capability and can automatically judge fault phases.

Description

technical field [0001] The invention relates to the field of power system transmission line protection, in particular to a distance relay for responding to a single-phase ground short circuit, an operating method and a device. Background technique [0002] Distance protection is widely used in power system line protection, and distance relay is the measuring element in distance protection. The impedance (distance) relay reflects the distance of the short-circuit point of the power system. If the short-circuit point falls within the protection zone, the distance relay acts; otherwise, it does not act. There are many types of distance relays for different applications. According to the reaction short circuit type, it can be divided into: ground distance relay and phase distance relay. [0003] When a grounding short circuit occurs in the power system, the grounding resistance is relatively large. Therefore, it is hoped that the grounding distance relay has a relatively larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/22
CPCH02H7/26H02H7/226
Inventor 周生奇贾亚军撖奥洋张滨董林刘惠群刘同同高岩牛庆达夏天宇齐仁磊胡薇陈静史先好沈昂王燕刘玡朋芮树玲罗鲁东于立涛
Owner STATE GRID SHANDONG ELECTRIC POWER
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