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02-09-2009 дата публикации

Grounded failure detection and judgment of DC system

Номер: CN0101520484A
Автор: WANG PENG, ZHANG LIANBIN, YIN YUFANG, HOU XIFENG, ZHU JINGMING, WANG BING, LI HUI, YIN SHUFENG, LI DAPENG, ZHAO CHANGCHUN, PENG WANG, LIANBIN ZHANG, YUFANG YIN, XIFENG HOU, JINGMING ZHU, BING WANG, HUI LI, SHUFENG YIN, DAPENG LI, CHANGCHUN ZHAO
Принадлежит:

The problem of correctly selecting a wire on the branch of the grounded failure of a DC system of a power system is always the difficult problem of the power system. The difficulty of correct wire selection is caused by the integrated reason on multiple aspects. The safety and the reliability of the DC system influence the running of a power plant and a transforming plant and relates to the safe production of the entire power network. The grounded failure detection and judgment of the DC system of the invention reaches the level of increasing the bus insulation monitoring alarm value from 48 kilohms to 100 kilohms. According to the requirements of (DL/T5044-95) design technical specification of DC systems of thermal power plants and transforming plants, the insulation check performance of corresponding branches is increased to the level of 300 kilohms from 20 kilohms, and the insulation detecting level of the branches covers various failure phenomena of the insulation alarm value of the ...

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Номер записи: 1
14-10-2009 дата публикации

Ground fault detection and calibration method and device for direct current system

Номер: CN0101556319A
Автор: WANG PENG, ZHANG LIANBIN, YIN YUFANG, HOU XIFENG, ZHU JINGMING, WANG BING, LI HUI, YIN SHUFENG, LI DAPENG, ZHAO CHANGCHUN, PENG WANG, LIANBIN ZHANG, YUFANG YIN, XIFENG HOU, JINGMING ZHU, BING WANG, HUI LI, SHUFENG YIN, DAPENG LI, CHANGCHUN ZHAO
Принадлежит:

The problem of correct wire selection of a branch with a ground fault of a direct current system of a power system is always a difficult problem for the power system. Comprehensive reasons on a plurality of aspects cause the phenomenon that the correct wire selection is difficult. The safety and the reliability of the direct current system affect the operation of power plants and transformer stations and are related to the safe production of the whole large power system. The ground fault detection and calibration method and the device for the direct current system improve the insulation supervision alarm value of a bus to the level of 100KO from 48KO. The ground fault detection and calibration method and the device are based on the requirements of (DL/T5044-95) technical regulations for design of direct current systems of fossil fuel power plants and transformer substations, and the corresponding branch insulating detection ability is improved to the level of 300KO from 20KO, and the branch ...

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Номер записи: 2