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Double-end traveling wave fault positioning method of power transmission line

A transmission line, double-ended traveling wave technology, applied in the direction of fault location, fault detection according to conductor type, etc., can solve the problems of low positioning accuracy, low sampling rate, etc., to simplify installation difficulty, improve communication efficiency, and reduce communication data volume Effect

Active Publication Date: 2016-07-27
YUNCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

In addition, due to the low sampling rate of existing traveling wave ranging devices, most of them do not exceed 1MHz, and the positioning accuracy is also low, and the theoretical and actual ranging errors often exceed 1km

Method used

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  • Double-end traveling wave fault positioning method of power transmission line
  • Double-end traveling wave fault positioning method of power transmission line
  • Double-end traveling wave fault positioning method of power transmission line

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] The present invention proposes a double-terminal traveling wave fault location method of a power transmission line, comprising the following steps:

[0017] S1. Install a detection device for detecting traveling wave signals every 10-15 km on the transmission line, number each detection device and mark them as A1, A2, ... Am, An, ... At.

[0018] Each detection device adopted in the double-terminal traveling wave fault location method of a power transmission line of the present invention includes a sensor module, a sampling system, an A / D conversion module, and a communication module, wherein the sensor module includes 3 non-contact sensors, which are installed separately On each phase of the transmission line, the sampling system is connected to the sensor module for collecting current and voltage signals in the sensor module,...

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Abstract

The invention provides a double-end traveling wave fault positioning method of a power transmission line. The method comprises the following steps that: S1, one detection device for detecting travelling wave signals is installed on the power transmission line every 10-15 km; S2, a sensor module receives current and voltage signals in the circuit, a sampling system carries out sampling and recording on the current and voltage signals, an A / D conversion module processes the signals, and the data is transmitted to a main control center through a communication module; S3, after the main control center analyzes the received data and discovers a fault traveling wave signal, a second fault traveling wave signal in the detection device An adjacent to the detection device Am corresponding to the fault traveling wave signal is found, and analysis and calculation are carried out according to the fault traveling wave signal and the second fault traveling wave signal, the time for a first travelling wave head to respectively arrive at the detection devices Am and An is obtained; and S4, the position of a fault point is calculated. According to the invention, the fault position is accurately calibrated, and the precision is high.

Description

technical field [0001] The invention belongs to the technical field of power system protection, and in particular relates to a double-terminal traveling wave fault location method of a power transmission line. Background technique [0002] Quickly and accurately determining the location of the fault point of the transmission line can speed up the repair of permanent faults, eliminate hidden dangers in time to avoid the recurrence of a large number of transient faults, and is of great significance to ensure the safety, stability and economic operation of the power system. [0003] At present, many methods have been proposed at home and abroad for fault location of transmission lines, mainly including impedance method, S injection method, "fault indicator" technology, feeder automation technology and traveling wave method. The impedance method is greatly affected by line impedance, load and power supply parameters. For distribution lines with multiple branches, the impedance m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 钱江梁斌李小明任永学于永星
Owner YUNCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER
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