发明名称 |
METHOD FOR DETERMINATION OF DAMAGED FEEDER ON BUS SECTION OF THREE-PHASE GRID WITH INSULATED NEUTRAL IN CASE OF SINGLE PHASE EARTH FAULTS |
摘要 |
FIELD: electrical engineering.SUBSTANCE: according to the method for determination of a damaged feeder on the bus section of a three-phase grid win an insulated neutral in case of single-phase earth faults, for power grids wherein transformers are installed on feeders with only two phases (usually - Phases A and C) one obtains the magnitudes and angles of zero-sequence pseudocurrents by way of digital conversion of analogue signals of two phase currents of each feeder prior to and after damage, their difference yielding the zero-sequence current in every feeder. Then one compares the zero-sequence currents complex magnitudes taking into account the facts that the zero-sequence current in the damaged feeder is the maximum among all the section feeders currents and that the angle of zero-sequence current in the damaged feeder differs from the angles of zero-sequence currents in the undamaged feeders by approximately 180 degrees.EFFECT: reliability improvement. |
申请公布号 |
RU2484570(C2) |
申请公布日期 |
2013.06.10 |
申请号 |
RU20110135444 |
申请日期 |
2011.08.24 |
申请人 |
TIGUNTSEV STEPAN GEORGIEVICH |
发明人 |
TIGUNTSEV STEPAN GEORGIEVICH |
分类号 |
H02H3/16 |
主分类号 |
H02H3/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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