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Power transmission line longitudinal linkage protective method

A technology of longitudinal protection and transmission lines, which is applied in the field of relay protection of power system transmission lines, and can solve problems such as difficult compensation and large distributed capacitance current

Inactive Publication Date: 2004-02-04
贺家李 +1
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Problems solved by technology

However, on ultra-high voltage and ultra-high voltage long lines, the distributed capacitive current is relatively large, especially in the transient process of the fault, and the capacitive current increases with the increase of the frequency of the harmonic in the fault voltage, so it is difficult to carry out effective compensation

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  • Power transmission line longitudinal linkage protective method
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Embodiment Construction

[0013] Taking a kind of model of power transmission line—Berrellon model as an example below, the present invention will be further described in conjunction with the accompanying drawings and implementation methods.

[0014] The Bergeron model proposed by Bergeron is an accurate transmission line model, which reflects the relationship between the voltage and current at both ends of the transmission line when there is no internal fault (including steady-state operation and external faults), see H.W.Dommel. DigitalComputer Solution of Electro-Magnetic Transients in Single and MultiphaseNetworks.", Literature IEEE, Journal Number PAS-88, 1969, April: 388-399. When the line fails internally, it is equivalent to adding a node at the fault point, and this relationship is destroyed. The invention proposes to use this difference to distinguish the internal and external faults of the line to form two new differential protection methods. These two new protection methods automatically t...

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Abstract

This invention concerns the relaying protection field of the power transmission line, especially concerned with the occasion of electric current differential protection and phase differential protection proceeding in the extra-high voltage and ultra-high voltage long distance ling. In order to solve the problem of which the traditional electric current differential protection and phase differential protection is influenced largely by distributed capacitance's current, thereby to improve the sensitivity of relaying protection, safety and reliability of the operation, the technique plan adopted by this invention is: according to a transmission line model formula, calculate a side of the line current moment flow, get calculated value, then using a filtering algorithm, filter the current actual value and calculate value, get the fundamental wave vector separately.

Description

technical field [0001] The invention relates to the field of relay protection for power system transmission lines, in particular to the occasion of performing current differential protection and phase differential protection on ultra-high voltage or ultra-high voltage long lines. Background technique [0002] So far, the principles of transmission line longitudinal protection mainly include directional longitudinal protection for comparing the power direction at both ends of the line, phase differential longitudinal protection for comparing the current phases at both ends of the line, and current differential longitudinal protection for comparing the full current at both ends . Published by China Electric Power Press in 1994, "Principles of Protective relaying in Electric Power Systems" written by He Jiali and Song Congju (He Jiali, Song Congju), expounding The principles of this kind of protection have been described, and each of these ...

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Application Information

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IPC IPC(8): H02H3/26H02H7/26
Inventor 贺家李郭征
Owner 贺家李
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