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A system and method for on-line monitoring of insulation status of substation DC system

A DC system, insulation state technology, applied in the direction of impedance measurement, measurement using digital measurement technology, fault location, etc., can solve the problem of not having the function of simultaneous detection of multiple grounding points, weak fault location function, and insufficient measurement accuracy, etc. problems, to meet the needs of branch monitoring, to achieve accurate positioning, and to solve the effect of weak fault location functions

Active Publication Date: 2017-11-03
南京汇创电力科技有限公司
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Problems solved by technology

The actual operation survey results show that the existing device is limited by the measurement principle and monitoring method, and the measurement accuracy is not high enough, and the fault location function is weak (only the entire line can be located, and there is no simultaneous detection of multiple ground points in the same branch. function), there are many shortcomings such as monitoring blind spots

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  • A system and method for on-line monitoring of insulation status of substation DC system
  • A system and method for on-line monitoring of insulation status of substation DC system
  • A system and method for on-line monitoring of insulation status of substation DC system

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Embodiment Construction

[0048] The system and method for on-line monitoring of the insulation state of the DC system of a substation according to the present invention will be further described below based on specific embodiments and accompanying drawings, but the description does not constitute an improper limitation of the present invention.

[0049] figure 1 It shows the topology structure of the on-line monitoring system for the insulation state of the DC system of the substation according to the present invention in an implementation manner.

[0050] Such as figure 1 As shown, the system in this embodiment includes: several DC leakage current detection devices, which are respectively used to detect the DC leakage current of each branch ( figure 1 Only two branches are schematically shown); the signal combining and diagnosing unit, which detects the positive and negative bus-to-ground voltages, and the signal merging and diagnosing unit is also wirelessly connected with each DC leakage current d...

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Abstract

The invention discloses an online monitoring system for the insulation state of a substation DC system. The system comprises multiple sets of DC leakage current detection devices and a signal merger and diagnosis unit. The DC leakage current detection devices are respectively used for detecting DC leakage current of all branches; each set of DC leakage current detection devices is provided with at least two DC leakage current detection devices which are used for detecting DC leakage current at different positions on the same branch respectively. The signal merger and diagnosis unit is used for detecting the voltage to earth of positive and negative buses and further wirelessly connected with all the DC leakage current detection devices to receive DC leakage current data transmitted by all the DC leakage current detection devices. The signal merger and diagnosis unit judges whether an insulation failure occurs or not and determines the position where the insulation failure occurs according to the detected voltage to earth of the positive and negative buses and the received DC leakage current data. The invention further discloses an online diagnosis method for the insulation state of the substation DC system.

Description

technical field [0001] The invention relates to an insulation state monitoring device and method, in particular to a DC system insulation state monitoring device and method. Background technique [0002] The working power supply of control systems, signal systems, and relay protection automatic control devices in power plants and substations is a DC system, which is a very large multi-branch power supply network. The insulation performance of its distribution lines is directly related to power plants, For the safe operation of substations, etc., it is of great significance to conduct on-line monitoring of its insulation and timely and effectively detect single-point grounding faults. [0003] At present, the insulation state assessment methods of DC systems mainly include balanced bridge method, differential DC method and AC method. The DC system insulation monitoring device developed based on the above method has been applied in the field. The actual operation survey resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/18G01R31/08G01R19/25
Inventor 何莲
Owner 南京汇创电力科技有限公司
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