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Fault range finding method for power transmission circuit by use of current travelling waves and voltage travelling waves of two ends of circuit

A current traveling wave and voltage traveling wave technology, applied in the field of power system fault location, can solve problems such as adverse effects, and achieve the effect of improving accuracy, improving accuracy, and improving accuracy

Active Publication Date: 2017-11-03
YUNNAN POWER GRID +1
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AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to propose a fault location method for transmission lines using current traveling waves and voltage traveling waves at both ends of the transmission line in order to avoid adverse effects on fault location when the electrical connection mode of a section of the transmission line is a single outlet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1: as figure 2 The simulation model of the 220kV transmission line shown has a total length of 110km. Suppose a phase A ground fault occurs 700km away from point A.

[0056] The current traveling wave and voltage traveling wave are obtained from the measurement points at both ends of the transmission line. The waveforms are as follows: image 3 , Figure 4 , Figure 5 , Image 6 shown. Through the MATLAB program, the phase-mode transformation and continuous wavelet transformation of the above waveform are processed, and the results are as follows Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, the fault distance obtained according to the continuous wavelet transform is:

[0057] x im =74.712km

[0058] x um =72.519km

[0059] (L-x in )=67.326km

[0060] (L-x un )=68.136km

[0061] Bringing fault data into the global geometric mean optimization formula

[0062]

[0063] Get the fault distance x=70.673, the error is 0.673km.

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Abstract

The invention relates to a fault range finding method for a power transmission circuit by use of current travelling waves and voltage travelling waves of two ends of the circuit, and belongs to the technical field of fault range finding of electric power systems. When a power supply circuit fails, current travelling waves and voltage travelling waves of the circuit are acquired from two measurement points of the circuit. Reflection wave head recognition is performed on the current travelling waves and the voltage travelling waves of the two ends of the circuit through continuous wavelet transformation and four groups of fault distance data is acquired according to initial travelling wave heads and emission wave heads. Composite integration is performed on the four groups of the data by use of the global geometrical average optimal method, so fault range finding of the power transmission circuit is achieved. According to the invention, accuracy of fault range finding of the power transmission circuit can be effectively improved and the method is quite highly reliable.

Description

technical field [0001] The invention relates to a fault location method of a transmission line using current traveling waves and voltage traveling waves at both ends of the line, and belongs to the technical field of fault location in electric power systems. Background technique [0002] Transmission line is the link of power transmission, and it also occupies a very important position as an important part of the power system. When a fault occurs on a transmission line, quickly and accurately determining the fault location will help to repair the fault line in time, reduce the pressure of line inspection and greatly shorten the fault time. How to quickly and accurately determine the fault location is very important for the safe, stable and economical operation of the power system. important. [0003] In the distance measurement by traveling wave method, if the electrical wiring method of a section of the line is a single outlet, since there is only one outlet at the end of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 方毅李本瑜石恒初张琳波游昊杨远航陈剑平罗吉翟海燕赵明束洪春张瑀明李录照赵云鹏
Owner YUNNAN POWER GRID
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