Longitudinal zero sequence direction protection method of one-tower double-circuit parallel transmission line

A transmission line, zero-sequence direction technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as protection misoperation, and achieve the effect of improving accuracy, reliability and safety

Active Publication Date: 2016-02-24
CENT CHINA GRID +1
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Problems solved by technology

(2) The latest research finds that the zero-sequence voltage zero-crossing point on the non-faulted line is also an important factor leading to the misoperation of the longitudinal zero-sequence directional protection of the non-faulted lin

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  • Longitudinal zero sequence direction protection method of one-tower double-circuit parallel transmission line
  • Longitudinal zero sequence direction protection method of one-tower double-circuit parallel transmission line
  • Longitudinal zero sequence direction protection method of one-tower double-circuit parallel transmission line

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Embodiment Construction

[0037] Combine below Figure 1-Figure 3 The technical solutions of the present invention are further described through specific implementation methods.

[0038] figure 1 It is a flowchart of a longitudinal zero-sequence direction protection method for double-circuit parallel transmission lines on the same tower provided by an embodiment of the present invention.

[0039] A longitudinal zero-sequence directional protection method for double-circuit parallel transmission lines on the same tower, comprising:

[0040] S10. A fault occurs on the transmission line, and the electrical quantities at both ends of the transmission line are collected;

[0041] S20, judging whether there is a negative sequence current at one end of the transmission line;

[0042] S30. If yes, judge whether the zero-sequence direction of the one end of the transmission line is positive;

[0043] S40. If yes, determine whether the zero-sequence directions at both ends of the transmission line are positi...

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Abstract

The present invention relates to the technical field of relay protection and particularly relates to a longitudinal zero sequence direction protection method of a one-tower double-circuit parallel transmission line. The method comprises a step of collecting the electrical quantity of two ends of a transmission line when the transmission line has a fault, a step of judging whether one end of the transmission line has negative sequence current or not, a step of judging whether the zero sequence direction of one end of the transmission line is positive or not if the one end of the transmission line has the negative sequence current, a step of judging whether the zero sequence directions of two ends of the transmission line is positive or not if the zero sequence direction of one end of the transmission line is positive, a step of judging that the fault is an internal region fault, and acting longitudinal zero sequence protection, otherwise, judging that the fault is an external region fault, and not acting longitudinal zero sequence protection. Through employing different zero sequence direction judgment methods for the different fault types in the transmission line, the accuracy of the longitudinal zero sequence direction protection is improved, the problem that the longitudinal zero sequence direction protection of the other non-failed line acts wrongly if one transmission line is failed in the one-tower double-circuit parallel transmission line is solved, and the reliability and the security of the transmission line are improved.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a longitudinal zero-sequence direction protection method for double-circuit parallel transmission lines on the same tower. Background technique [0002] For my country's ultra-high voltage transmission network, the main configuration of the longitudinal protection is used as the main protection of the transmission line. The longitudinal protection includes the longitudinal differential protection, the longitudinal distance protection, and the longitudinal zero-sequence directional protection. With the completion and commissioning of the Three Gorges Water Conservancy and Electric Power Project in my country, the power grid pattern of west-to-east power transmission and north-south mutual supply has gradually formed. In the construction of ultra-high voltage transmission lines in my country, double-circuit parallel transmission lines on the same tower have been widely used...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 谢俊李会新李勇刘宏君王英英潘军军俞伟国辜新宇李炜霞凌昊
Owner CENT CHINA GRID
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