Direct current system insulation monitoring method and device

A technology of insulation monitoring and DC system, which is applied in the field of power system, can solve the problems of time-consuming and failure to detect faulty branches in time, and achieve the effect of timely detection and shortening the time for detecting faulty branches

Active Publication Date: 2013-04-03
ZTE CORP
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Problems solved by technology

[0007] The embodiment of the present invention provides a DC system insulation monitoring method and equipment, which are used to solve the problem in the p

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  • Direct current system insulation monitoring method and device
  • Direct current system insulation monitoring method and device
  • Direct current system insulation monitoring method and device

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Embodiment Construction

[0046] In the background technology, when the busbar of the DC system fails, the process of determining the faulty branch is time-consuming, so that the faulty branch cannot be detected in time; The pole to be detected of the branch is detected, and the pole to be detected of the branch is detected to determine the faulty branch, which avoids the need to inspect the positive and negative poles of each branch every time there is a bus fault, thus greatly The time for detecting the fault branch is shortened, and the fault branch can be detected more timely; the embodiment of the present invention determines the fault branch according to the current value of the leakage current of each branch when the positive bus or the negative bus fails. It avoids determining the faulty branch according to the positive insulation resistance value and the negative insulation resistance value of each branch, thereby greatly shortening the detection time of the faulty branch, and then can detect t...

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Abstract

The implement of the invention relates to the field of an electric power system, particularly relates to a direct current system insulation monitoring method and a direct current system insulation monitoring device, and is used for solving the problem in the prior art that in the monitoring of a direct current system, the time consumption of the branch routing inspection process is large, so that the faulted branch can not be detected in time. The direct current system insulation monitoring method provided by the implement of the invention comprises the steps of determining a to-be-detected pole of the branch connected with a faulted bus when the bus faults, and detecting the to-be-detected pole of the branch, wherein the insulation resistance value of the bus connected with the to-be-detected pole is not large than a first threshold. The direct current system insulation monitoring method and the direct current system insulation monitoring device provided by the implement of the invention can determine the to-be-detected pole of the branch connected with the faulted bus when the bus faults, and detect the to-be-detected pole of the branch so as to determine the faulted branch, so that the negative pole and the positive pole of each branch are not required to be inspected every time the bus faults, thereby greatly shortening the time for detecting the faulted branch.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a DC system insulation monitoring method and equipment thereof. Background technique [0002] The DC system is an important part of power plants and substations. The safety and reliability of the DC system affects the safe operation of power plants and substations, and is related to the safe production of the entire power grid. The DC systems of power plants and substations are relatively complicated, and they are connected with relay protection, signal devices, automatic devices, terminal boxes and operating mechanisms of indoor and outdoor power distribution devices, and are used for electrical, thermal, automatic devices, and relay protection. , emergency lighting, communication and other secondary equipment to provide power, and the normal operation of these secondary equipment is very important to ensure the safe operation of power plants and substations. Therefore, it is neces...

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Application Information

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IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/086G01R31/08G01R31/52
Inventor 罗兵熊勇李艳玲
Owner ZTE CORP
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