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Adaptive earthing distance relay

A technology of grounding impedance and relays, which is applied to electrical components, emergency protection circuit devices, etc., and can solve problems such as poor resistance to transition resistance

Inactive Publication Date: 2008-12-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose an adaptive grounding impedance relay in view of the defects in the prior art, which has good adaptability to the transition resistance, so as to overcome the faults in the protection zone of the existing impedance relay. The problem of poor anti-transition resistance ability

Method used

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Examples

Experimental program
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Embodiment Construction

[0049] MATLAB software is used to simulate and calculate a 300Km long 500KV EHV line when phase A is grounded, and the transmission line adopts a distributed parameter model. System wiring such as figure 1 As shown, the simulation system parameters are as follows:

[0050] System parameters: Z M = Z N =5.74+j14.1Ω

[0051] Line parameters: r 1 = 0.02083Ω / km, l 1 = 0.8984mH / km, c 1 =0.0129MF / km

[0052] r 0 = 0.1148Ω / km, l 0 =2.2886mH / km, c 0 = 0.00523 MF / km.

[0053] The phase difference of the power supply potential on both sides of the line is 60°, and the setting area is 85% of the total length of the line.

[0054] Simulation calculation content: Simultaneously polarize the negative sequence voltage ( ) and the currently commonly used memory voltage polarization ( ), positive sequence voltage polarization ( ) phase simulation of the action characteristics of the ground impedance relay, and calculate phase. The relays are respectively set on the power tr...

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Abstract

This invention relates to high voltage output circuit fault distance protection technique and to one self-adapting earth resistance relay, which forms the relay by fault protection fixing place negative voltage Um2 as electrode volume. This invention relay not only has strong transition resistance force and also with negative sequence volume protection integrated with good self-adapting relay.

Description

technical field [0001] The invention relates to a high-voltage transmission line grounding fault distance protection technology. Background technique [0002] Single-phase ground fault is the main form of high-voltage power grid fault, and most other faults are also formed by single-phase ground fault. Therefore, improving the performance of grounding impedance relays is of great significance for reducing losses caused by grid faults and improving the safety and stability of grid operation. How to overcome the impact of transition resistance on the protection zone and how to ensure the directionality of the action are important issues to be solved for grounding impedance relays. There are many research literatures on grounding impedance relays. These grounding impedance relays have different performances, or have strong anti-transition resistance capabilities, but the phenomenon of exceeding is serious; or the anti-transition resistance capabilities are not enough; or have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 杨兰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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