Four-circuit power transmission line fault distance measurement method based on same-sequence and zero-sequence components

基于同序零序分量的同塔四回输电线路故障测距方法

Abstract

一种电力系统继电保护技术领域的基于同序零序分量的同塔四回输电线路故障测距方法,采用相模变换的方法对同塔四回输电线路模型中的同塔四回输电线路阻抗矩阵进行解耦,获得十二种互相独立的序阻抗分量,然后对同步采样获得的同塔四回输电线路两侧所有电气量进行对应一致的相模变换并得到序电压及序电流向量,然后提取出同序零序电压和同序零序电流,最后根据线路两侧母线计算故障点电压相等计算得到故障距离占比。本发明适用于电力系统中的同塔四回输电线路,能够在各种类型的短路故障类型下对短路故障点进行精确测距,且不受线路两侧系统运行方式影响,耐受过渡电阻能力强。
The invention provides a four-circuit power transmission line fault distance measurement method based on same-sequence and zero-sequence components in the technical field of power system relay protection. A four-circuit power transmission line impedance matrix is decoupled in a four-circuit power transmission line model through a phase-mode transformation method so as to obtain twelve sequence impedance components which are independent of one another, the corresponding consistent phase-mode transformation is conducted on all electrical quantities on the two sides of the four-circuit power transmission line which is obtained through synchronous sampling so as to obtain the sequence voltage and the sequence current vector, extracting the same-sequence and zero-sequence voltage and the same-sequence and zero-sequence current, and the equivalence relation between the fault points of buses on the two sides of the line is calculated so that the fault distance occupancy ratio can be obtained. The method is suitable for four-circuit power transmission lines in a power system, the accurate distance measurement can be conducted on short-circuit points under various types of short-circuit faults without being influenced by the system running methods of the two sides of the lines, and the transition resistance tolerance capacity is high.

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Cited By (2)

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    CN-105467275-AApril 06, 2016北京四方继保自动化股份有限公司Cross-voltage fault current calculating method of mixed-voltage same tower four circuits with two-phase crossing two-phase
    CN-105486981-AApril 13, 2016华北电力大学, 北京四方继保自动化股份有限公司Voltage-crossing fault current calculation method for crossing from single-phase to double-phase by mixed-voltage one tower four-parallel lines