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Ground distance relay and action method and device

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

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 embodiment of the present invention is that the calculation of the phase comparison criterion of the grounding distance relay in the prior art is complicated

Method used

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  • Ground distance relay and action method and device
  • Ground distance relay and action method and device
  • Ground distance relay and action method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides an action method for a ground distance relay, for example, it is applied to a ground distance relay, such as figure 1 shown, including the following steps:

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

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

[0051] S3, respectively judge 270°1 2 3 1 2 3 <360°, go to step S4; otherwise, go to step S5.

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

[0053] S5. Generate a signal for inactivating the ground distance relay.

[0054] Preferably, the compensation voltage vector The calculation formula is:

[0055]...

Embodiment 2

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

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

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

[0061] Judging unit 43, for judging 270°1 2 3 Whether <360° is established;

[0062] Action signal generation unit 44, for when 270°1 2 3 When <360°, a signal is generated to activate the ground distance relay.

[0063] Preferably, the compensation voltage vector The calc...

Embodiment 3

[0067] This embodiment provides a ground distance relay, 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] The processor 4 includes a grounding distance relay operating device, and the grounding distance relay operating device includes:

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

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Abstract

The invention discloses a ground distance relay action method and device and a ground distance relay reflecting a single-phase ground short circuit. The method comprises the following steps that the action criterion comparative quantity is obtained; theta1, theta2 and theta3 are calculated respectively; whether the conditions that the theta1 is larger than 270 degrees and smaller than 360 degrees, the theta2 is larger than 270 degrees and smaller than 360 degrees and the theta3 is larger than 270 degrees and smaller than 360 degrees are satisfied or not is judged respectively; when the theta1 is larger than 270 degrees and smaller than 360 degrees, the theta2 is larger than 270 degrees and smaller than 360 degrees and the theta3 is larger than 270 degrees and smaller than 360 degrees, a signal for making ground distance relay acted is generated. According to the ground distance relay action method and device and the ground distance relay reflecting the single-phase ground short circuit, a phase comparison criterion is simple, the reliability is high, the ground distance relay has strong transition resistance resistant capacity, and a fault phase can be automatically judged.

Description

technical field [0001] The invention relates to the field of power system transmission line protection, in particular to a grounding distance relay, 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 will act; otherwise, it will 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 large allowable transition resistance capabi...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H7/22
CPCH02H7/26H02H7/226
Inventor 于立涛周生奇贾亚军罗鲁东公维勇张媛高磊磊高岩刘同同齐仁磊史先好沈昂杨超秦志龙管春伟
Owner STATE GRID SHANDONG ELECTRIC POWER
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