发明名称 |
Directional comparison distance relay system |
摘要 |
A directional comparison distance relay system for protecting a power transmission line. The relay system comprises a fault detection unit which includes a directional distance relay element for deciding whether a fault is in forward or reverse directions; a short-circuit distance relay element for deciding whether a fault is within a protection zone by distance calculation; and an evolving fault detecting unit for deciding an evolving fault when a forward earth fault directional relay in a single phase and a reverse directional relay in a phase are in operation. The relay system further comprises a block unit for blocking trip of a circuit breaker at a near end due to the short-circuit distance relay, and for blocking permissive trip signal to a circuit breaker at the far end, based on an operation of the evolving fault detecting unit.
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申请公布号 |
US6937453(B2) |
申请公布日期 |
2005.08.30 |
申请号 |
US20030347454 |
申请日期 |
2003.01.21 |
申请人 |
KABUSHIKI KAISHA TOSHIBA |
发明人 |
KASE TAKAHIRO;AMO HIDENARI;SONOBE YASUTAKA |
分类号 |
H02H3/26;H02H3/08;H02H3/38;H02H3/40;H02H7/26;(IPC1-7):H02H3/00 |
主分类号 |
H02H3/26 |
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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