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Common-tower double-transmission-line non-cross-line fault ranging method only utilizing single-end information

A technology of double circuits and transmission lines on the same tower, applied in the direction of fault location, etc., can solve the problems of less information and low ranging accuracy, and achieve the effect of ensuring ranging accuracy

Active Publication Date: 2013-09-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-ended method is easy to implement and does not require a communication channel to transmit the information of the opposite end, but the amount of information obtained is small. Due to the influence of the transition impedance of the fault point and the load current, the distance measurement accuracy outside the half-line length is not high
The double-ended method uses double-ended data, which can eliminate the impact of transition resistance on ranging accuracy, and is not affected by fault types and system parameters, and can ensure high ranging accuracy, but requires communication channels to transmit data at both ends. And it is necessary to solve the problem of double-ended data sampling synchronization

Method used

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  • Common-tower double-transmission-line non-cross-line fault ranging method only utilizing single-end information
  • Common-tower double-transmission-line non-cross-line fault ranging method only utilizing single-end information
  • Common-tower double-transmission-line non-cross-line fault ranging method only utilizing single-end information

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Experimental program
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Embodiment approach 1

[0106] Implementation Mode 1: Double-circuit transmission lines on the same tower such as figure 1 shown. The line parameters are as follows: the voltage level is 500kV, the total length of the line is 140km, the circuit impedance of circuit I is: 0.011344+j0.26054Ω / km, and the circuit impedance of circuit II is: 0.011344+j0.26054Ω / km. The data sampling rate is 20kHz. A single-phase ground fault occurs in the Ⅰ loop line 50km away from the M measuring end, and the transition resistance is 10Ω.

[0107] (1) Using the phase-to-mode transformation matrix, the voltage and current phasors detected at the head ends of the two circuit lines are converted into independent moduli of the two circuit lines, and a T-type equivalent double-circuit transmission line on the same tower is established based on concentrated parameters Modular fault component networks (such as figure 2 as shown, is the line unit positive sequence resistance value, is the line unit positive sequence ind...

Embodiment approach 2

[0111] Implementation Mode 2: Double-circuit transmission lines on the same tower such as figure 1 shown. The line parameters are as follows: the voltage level is 500kV, the total length of the line is 140km, the circuit impedance of circuit I is: 0.011344+j0.26054Ω / km, and the circuit impedance of circuit II is: 0.011344+j0.26054Ω / km. The data sampling rate is 20kHz. A single-phase grounding fault occurs in the Ⅱ loop line 80km away from the M measuring end, and the transition resistance is 10Ω.

[0112] (1)) Using the phase-to-mode transformation matrix, the voltage and current phasors detected at the head ends of the two circuit lines are converted into independent moduli of the two circuit lines, and a T-type equivalent double-circuit transmission line on the same tower is established based on concentrated parameters Modular fault component networks (such as Figure 4 as shown, is the line unit positive sequence resistance value, is the line unit positive sequenc...

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Abstract

The invention provides a common-tower double-transmission-line non-cross-line fault ranging method only utilizing single-end information and belongs to the technical field of power system protection and ranging. When one loop of a common-tower double-transmission-line power transmission line fails, a phase-mode matrix is used to decouple coupled phasors of two loops to obtain independent line-mode components of the two loops; analyzing a line-mode fault component network, using fault loop initial-end voltage and current fault component to calculate voltage of fault points and tail-end voltage, using tail-end boundary conditions of a line to calculate voltage of fault points, writing a fault positioning function according to the fact that fault point voltages at two ends are equal, and solving the positioning function to calculate fault distance.

Description

technical field [0001] The invention relates to a distance measurement method for a non-cross-line fault of a double-circuit transmission line on the same tower using only single-end information, and belongs to the technical field of power system protection and distance measurement. Background technique [0002] Double-circuit lines paralleled on the same tower have been widely used because of their advantages such as low engineering cost, small occupied corridor width, short construction period, simple operation and maintenance, and significant economic benefits. Accurate fault when double circuit fault [0003] The distance measurement method has important practical significance for quickly and accurately finding the fault point, quickly eliminating the fault and restoring the power supply of the line in time. [0004] The fault analysis methods used in parallel double-circuit transmission lines on the same tower are nothing more than single-ended and double-ended methods...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 束洪春田开庆苏玉格董俊
Owner KUNMING UNIV OF SCI & TECH
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