发明名称 |
Network protector relay and method of controlling a circuit breaker employing two trip characteristics |
摘要 |
A network protector relay controls a circuit breaker connected between polyphase feeder and network busses. A circuit samples polyphase circuit breaker current and network voltage to generate digital polyphase current and voltage samples. A microcontroller generates positive sequence current and voltage vectors from the current and voltage samples. A first trip algorithm trips the breaker in response to the positive sequence current vector being in a first trip region of a first trip characteristic with respect to the positive sequence voltage vector. The first trip characteristic is defined by a reverse trip setpoint and a first positive angle. A second trip algorithm trips the breaker in response to the positive sequence current vector being in a second trip region of a second trip characteristic with respect to the positive sequence voltage vector. The second trip characteristic is defined by the reverse trip setpoint and a second negative angle.
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申请公布号 |
US6671151(B2) |
申请公布日期 |
2003.12.30 |
申请号 |
US20010971317 |
申请日期 |
2001.10.03 |
申请人 |
EATON CORPORATION |
发明人 |
SMITH DAVID ROBERT;MOFFAT, JR. JOHN ROBERT;KENNY THOMAS JOSEPH |
分类号 |
H02H3/38;(IPC1-7):H02H3/08 |
主分类号 |
H02H3/38 |
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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