Overhead line fault positioning monitoring device

Abstract

Provided is an overhead line fault positioning monitoring device, belonging to the field of power grid fault detection apparatus. The device includes a base and a fault detection module arranged on the base, the base is provided with an inclined plane, a semi-cylindrical flip cover is arranged corresponding to the inclined plane, the base is connected with the flip cover through a locking slide lock, the fault detection module includes two through type current transformers, one is an electricity obtaining ring and the other is a measuring ring, the winding of the electricity obtaining ring is connected to the input port of the power supply of the fault detection module, the winding of the measuring ring is connected to the monitoring signal input port of the fault detection module, each current transformer is divided into an upper half ring and a lower half ring that are fixed on the base, and the upper half ring is correspondingly arranged on the flip cover. The connection of the base and the flip cover is realized by the locking slide block structure, so that the installation is convenient; the double current transformers effectively solve the contradiction between the induction electricity obtaining and measurement, so that the measurement precision is improved while the normal work of the device is guaranteed, and the device has the characteristic of high fault capturing accuracy.

Description

technical field [0001] The invention relates to the field of power grid fault detection devices, in particular to an overhead line fault location monitoring device. Background technique [0002] Distribution network automation greatly improves the reliability and quality of power supply, shortens the time for handling accidents, and reduces the scope of power outages. However, at present, power distribution terminals (FTU / DTU / TTU) are generally deployed at the position of switches or transformers, and there is a lack of control over long-distance power distribution lines. At the same time, distribution lines have long transmission distances, many line branches, complex operating conditions, and harsh environmental and climatic conditions. Natural disasters such as external breakage, equipment failure, and lightning often cause short circuits and ground faults on the lines. When a fault occurs, the fault area The section (location) is difficult to determine, which brings gre...

AI Technical Summary

Problems solved by technology

However, at present, power distribution terminals (FTU / DTU / TTU) are generally deployed at the position of switches or transformers, and there is a lack of control over long-distance power distribution lines.

At the same time, distribution lines have long transmission distances, many line branches, complex operating conditions, and harsh environmental and climatic conditions. Natural disasters such as external breakage, equipment failure, and lightning often cause short circuits and ground faults on the lines. When a fault occurs, the fault area It is difficult to determine the section (location), which brings great difficulties to the maintenance work, especially in remote areas, it is time-consuming and laborious to find

[0003] At present, there are mainly the following shortcomings in the detection of overhead line faults: the accuracy of current transformers is low. At present, these fault indicators are generally directly clamped on the line by rough fixtures to form a magnetic circuit. The air gap of the current transformer is too large and the magnetic flux circuit is not ideal, which leads to the reduction of the accuracy of the current transformer, so that it cannot reflect the small current change, and the installation structure is complicated, and the work efficiency is poor; mechanical overhead Line fault indicators are judged separately and display alarms separately. The workload of line inspection is very large, and it is difficult to troubleshoot and locate quickly; it does not have the function of communication security; the GPRS public network environment is relatively complicated, and the security is poor. layer security risks and application layer security risks

For the ground fault indicator transient quantity method, due to the various properties of the line load, various high-frequency signals are very easy to interfere with the detection of the transient quantity signal; for the first half-wave method, this principle is based on the fact that the ground fault occurs at the peak voltage, This basis is insufficient, because most ground faults do not occur at voltage peaks, and even occur at voltage zero crossings, so the first half-wave method cannot accurately detect ground faults

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