基于故障分量计算的高压长线故障测距方法研究*

doi:10.11985/2020.03.015

摘要/Abstract

摘要：

故障测距是一种自动测定线路故障点位置的技术,能有效提升巡线效率和保障快速恢复供电。准确性是对故障测距装置最重要的要求,不准确的测距信息会加大输电巡线工作难度。针对过渡电阻和线路参数变化容易引起测距结果偏差大的问题,提出了一种基于故障分量法计算的高压长线故障测距方法。该方法在高压长线路的集中参数模型基础上,利用故障分量法推导出简易测距方程,给出了故障距离比的表达式,并在线路保护装置上实现了测距方法的功能应用。试验结果表明,该方法测距精度优良,最大偏差为150 m,不易受过渡电阻和参数变化影响,能适用于各种短路故障。

关键词: 故障分量, 参数变化, 过渡电阻, 故障测距

Abstract:

Fault location is a technology that automatically determines the location of line fault points, which can effectively improve the efficiency of line inspection and ensure the rapid restoration of power supply. Accuracy is the most important requirement for fault ranging devices. Inaccurate ranging information will increase the difficulty of power transmission line inspection. A high voltage long line fault location method based on fault component calculation is proposed to solve the problem that the transition resistance and line parameters can easily cause large deviations in ranging results. Fault location method for long-distance high voltage calculated based on fault component method. Based on the centralized parameter model of high-voltage long lines, the function application of fault location method on the line protection device is realized, with a simple ranging equation is derived by using the fault component method and the expression of the fault distance ratio is obtained. The test results show that the method has good ranging accuracy, the maximum deviation is 150 m, the method is not easily affected by the transition resistance and parameter changes, and can be applied to various short-circuit faults.

Key words: Fault component, parameter change, transition resistance, fault location

中图分类号:

TM773

李澄,邵亮. 基于故障分量计算的高压长线故障测距方法研究^*[J]. 电气工程学报, 2020, 15(3): 113-119.

LI Cheng,SHAO Liang. Research on High Voltage Long Line Fault Location Method Based on Fault Component Calculation[J]. Journal of Electrical Engineering, 2020, 15(3): 113-119.

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基本参数	正序	零序
阻抗/(Ω/km)	0.07	0.45
感抗/(Ω/km)	0.5	1.3
并联电容/(MΩ·km)	0.51	0.77

故障位置/km	x_T/km			x_S/km
故障位置/km	P	Q		P	Q
0	0	60	0.00		60.00
8	8	52	8.03		51.97
16	16	44	15.99		44.01
24	24	36	24.00		36.00
32	32	28	32.05		27.95
40	40	20	39.99		20.01
48	48	12	47.99		12.01
56	56	4	56.01		3.99

Z/Ω	故障位置	x_T/km			x_S/km
Z/Ω	故障位置	P	Q		P	Q
33	AN	40	20	40.08		19.92
	AB	40	20	40.10		19.90
	BCN	40	20	40.05		19.95
	ABC	40	20	39.98		20.02
50	AN	40	20	35.01		24.99
	AB	40	20	37.75		22.25
	BCN	40	20	34.00		26.00
	ABC	40	20	35.12		24.88
100	AN	40	20	34.15		25.85
	AB	40	20	35.99		24.01
	BCN	40	20	35.89		24.11
	ABC	40	20	34.21		25.79

Z/Ω	故障位置	x_T/km			x_S/km
Z/Ω	故障位置	P	Q		P	Q
33	AN	40	20	40.11		19.89
	AB	40	20	40.08		19.92
	BCN	40	20	39.99		20.01
	ABC	40	20	40.15		19.85
50	AN	40	20	40.09		19.91
	AB	40	20	39.98		20.02
	BCN	40	20	39.99		20.01
	ABC	40	20	39.91		20.09
100	AN	40	20	40.01		19.99
	AB	40	20	39.99		20.01
	BCN	40	20	39.98		20.02
	ABC	40	20	39.95		20.05