High-volage transmitting-line multiple-path high-precision GPS single-end fault positioning method and apparatus

Abstract

Signals are fetched out from winding at secondary side of current transformer on each line so as to obtain detected currents in triphase after voltage conversion and isolation of high-ohmic resistor. Threshold measuring detected currents in triphase is carried out in order to determine fault lines, and functions of high-speed data correction and A / D conversion are started up. Characteristic data of defective form of traveling wave are picked up from the A / D converted data, which are labeled with time mark by high precision GPS device. Then, being sorted and matched according to lines, the labeled data are stored to memory in computer. Fault category is determined and fault distance is calculated out by using the said computer and dedicated application software to analyze and calculate characteristic data after multiple refractions and reflections in each line as well as time difference. The invention raises location accuracy, reliability, practibility and economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of a high-voltage transmission network in an electric power system, and in particular relates to a multi-channel high-precision GPS single-end fault location method and device for a high-voltage transmission line. Background technique [0002] High-voltage transmission line fault location device is the main equipment for fault diagnosis of high-voltage transmission network in power system. Commonly used high-voltage transmission line fault location devices can be divided into two types from the principle point of view: [0003] (1) Impedance method: This method detects the voltage and current values ​​on one side of the line (single-ended method) or both sides (double-ended method), and calculates the equivalent impedance from the detection point to the fault point of the transmission line through mathematical methods, so that Determine the location of transmission line faults. The posit...

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Problems solved by technology

[0006] (1) Low positioning accuracy: The error of the traveling wave method is generally 500-1000 meters, and the error of the impedance method is generally 3-5% of the total length of the line;

[0007] (2) The reliability is not high: traveling wave ranging is difficult to catch the wave head when the fault is close, and the dead zone is large; the error of the impedance method increases with the length of the fault line. Unreliable;

[0008] (3) A substation generally requires multiple sets of fault location devices, which are costly and require heavy maintenance workload;

[0009] (4) The double-ended fault location device needs to install corresponding equipment at the opposite end, which needs to occupy the communication channel, and it is difficult to debug and maintain

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