发明名称 |
METHOD AND DEVICE FOR POWER SYSTEM PROTECTION |
摘要 |
The present invention relates to a method for protecting a zone in a power system, which zone comprises a number of transmission lines connected to power sources and a number of transmission lines connected to a number of loads where the power sources and the loads are arranged outside the zone, wherein the method comprises the steps of: continuously measuring all the incoming currents (Iin) to the zone, continuously measuring all the outgoing currents (Iout) from the zone, and continuously calculating the differential current (Id) according to Id = Iin - Iout. The method is characterised in continuously integrating Iin, Iout and Id according to Formula (I), where T is the fundamental frequency cycle, whereby changes of the continuously integrated values I<IN?, I>OUT< and I>D< constitute indications of whether faults on the power system occur within or outside the zone. The present invention also relates to a device and computer program product for performing the method.
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申请公布号 |
WO0180393(A1) |
申请公布日期 |
2001.10.25 |
申请号 |
WO2001SE00826 |
申请日期 |
2001.04.12 |
申请人 |
ABB AB;WANG, JIANPING;GAJIC, ZORAN;GOERANSSON, MIKAEL |
发明人 |
WANG, JIANPING;GAJIC, ZORAN;GOERANSSON, MIKAEL |
分类号 |
H02H3/28;H02H3/44;(IPC1-7):H02H3/28 |
主分类号 |
H02H3/28 |
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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