Transmission line malfunction positioning method based on non-contact magnetic measurement

Abstract

The invention discloses a transmission line malfunction positioning method based on non-contact magnetic measurement. The method is characterized by comprising step A, confirming a malfunction section; step B, identifying the type of the malfunction; and step C, internally positioning the malfunction section, wherein the malfunction section is confirmed by the following ways: constructing a remote terminal arranged on a transmission steel pylon, wherein the remote terminal consists of a microprocessor CPU (Central Processing Unit), a sensor, a signal regulating module, a data acquisition module DAQ (Data Acquisition), a storing module, a data communication module and a power supply module, wherein the sensor is used for measuring the three-dimensional component of the magnetic field at a three-dimensional space, and the data is transmitted to the DAQ module after passing through the signal regulating module. The invention provides a new transmission line malfunction positioning method based on the non-contact magnetic measurement. The malfunction section is positioned according to the magnetic data near the transmission line measured by a magneto-resistance magnetic field sensor with high sensibility, high band width and low cost.

Description

technical field [0001] The invention relates to a transmission line fault location, in particular to a transmission line fault location method based on non-contact magnetic field measurement. Background technique [0002] Overhead transmission lines are widely used for power transmission between the power generation area and the receiving end grid. In recent years, with the rapid development of the power system, there are more and more transmission lines. These lines are prone to failure due to lightning strikes, short circuits, equipment failures, misuse, overload, etc. Statistics show that transmission line faults are the most common faults in power systems. When a transmission line fails, detecting and locating the fault is of great significance for the inspection personnel to maintain the line and restore the system power supply as soon as possible. The time to determine the fault point of the line is an important index for evaluating the power transmission, and there...

AI Technical Summary

Problems solved by technology

For long-distance power transmission, the accuracy of fault location becomes especially important, because even a small algorithm error will lead to a difference of several kilometers in fault location, which makes maintenance personnel spend more time to find the point of failure

Especially in some mountainous areas (such as Liangshan in China), this fault location system may cause an error of ± 3km in the 500KV transmission line, so maintenance personnel have to walk about 6 kilometers in the mountainous area to determine the specific location of the fault

Moreover, for some non-permanent faults, such as arcing caused by line sag, due to the transient nature of this type of fault, that is to say, the location where the fault occurred will automatically return to the normal state shortly after the fault occurs. , if this fault location system is adopted, maintenance personnel will spend more energy to determine the specific location of the fault

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