Small current earthing wire-selecting method

A technology of low-current grounding and line selection method, applied in electrical components, emergency protection circuit devices, fault locations, etc., can solve problems such as low accuracy of grounding lines, power outages, and non-compliance with regulations for safe operation of power systems. The effect of improving the accuracy of judgment

Inactive Publication Date: 2007-11-07
BEIHAI YINHE HI TECH INDAL
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Problems solved by technology

[0002] At present, the correct rate of judging the grounding line by the small current grounding line selection device in China is not high. The current practice is to give several lines that may have ground faults, and then use the traditional processing method to ju

Method used

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  • Small current earthing wire-selecting method

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Embodiment

[0012] The specific equipment of the substation includes: 10 10kv transmission lines, 2 35kv incoming lines, 35kv level busbars, transformers using Sg series 10-2000KVA, 35KV distribution transformers of Guangxi Beihai Yinhe High-tech Industry Co., Ltd., and measurement data acquisition devices Adopt 10 YHB5321 protection measuring devices and 2 YHB5802 measurement and control devices from Guangxi Beihai Yinhe High-tech Industry Co., Ltd.; operator workstation - Advantech industrial computer (CPU P4 2.8G, memory 512M, hard disk 120G, Win2000Server, Guangxi Beihai Yinhe Technology YH-5000 substation monitoring system software).

[0013] The implementation of the analysis is realized by the following steps: through the YHB5321 protection measurement device and the YHB5802 measurement and control device, the current, voltage, active power, reactive power, COSΦ, switch position and other electrical information of each line in the substation are collected, and these measurement devi...

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Abstract

This invention relates to an earth line selection method including a computer, a communication network, an integrated test device and a protection test device characterizing that when a single-phase earth fault happens to the system, residual voltage is generated at the hatch triangle place of a bus voltage mutual inductor, theoretically, zero-sequence current of the faulty circuit should be the maximum, yet actual value may be not, so three circuits with the greatest current amplitude are selected as the faulty earth circuits, then the breaker of a circuit with not important load is selected to trip then to compare the residual voltage, zero-sequence current and power direction with those after the trip so as to determine which one in the three is the earth faulty circuit.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering, and in particular relates to an improved design of a small current grounding line selection method. Background technique [0002] At present, the correct rate of judging the grounding line by the small current grounding line selection device in China is not high. The current method is to give several lines that may have ground faults, and then use the traditional processing method to judge the faulty line by switching off the power line one by one. , This will cause a long-term power outage, which not only affects production and domestic electricity consumption, but also does not comply with the regulations for the safe operation of the power system. Contents of the invention [0003] The purpose of the present invention is to provide a small current grounding line selection method to overcome the shortcomings of the current small current grounding line selection device. [...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
Inventor 蔡迅华王向东
Owner BEIHAI YINHE HI TECH INDAL
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