发明名称 |
DIFFERENTIAL PROTECTIVE RELAY FOR ELECTRICAL BUSES WITH IMPROVED IMMUNITY TO SATURATION OF CURRENT TRANSFORMERS |
摘要 |
A differential protective relay and method for a microprocessor-based bus differential protective relay that ensures fast and sensitive operation under internal fault conditions and offers improved stability during external fault and other non-internal fault conditions. The method uses a two-slope differential characteristic to cope with small CT transformation errors without reducing relay sensitivity. The method can also use a saturation detector to switch dynamically between the 1-out-of-2 and 2-out-of-2 operating mode depending whether or not the CTs saturate. In a 2-out-of-2 operating mode, both the differential and directional elements must confirm a fault for the relay to trip. In a 1-out-of-2 mode, if saturation is not detected, the relay can trip without checking the fault direction.
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申请公布号 |
WO0176036(A3) |
申请公布日期 |
2002.02.28 |
申请号 |
WO2001US10748 |
申请日期 |
2001.04.03 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
KASZTENNY, BOGDAN, Z.;KULIDJIAN, ARA |
分类号 |
H02H3/28;H02H7/22;(IPC1-7):H02H7/22;H02H3/26 |
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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