发明名称 |
Apparatus and method for determining a faulted phase of a three-phase ungrounded power system |
摘要 |
Provided is an apparatus and method for determining a faulted phase resulting from a fault in a three-phase ungrounded power system. The method includes comparing a phase angle of an operating phasor to a phase angle of a fixed reference phasor. The operating phasor is derived from a digitized signal sample of a plurality of measured signals of the power system. The method also includes comparing a phase angle difference between the operating phasor and the fixed reference phasor to at least one threshold to determine the faulted phase. The fixed reference phasor may be a phase-to-phase voltage or a positive sequence voltage of the plurality of measured signals of the power system. The operating phasor may be a zero sequence current, a zero sequence voltage or a combination of a zero sequence current and a zero sequence voltage of the plurality of measured signals of the power system.
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申请公布号 |
US7345488(B2) |
申请公布日期 |
2008.03.18 |
申请号 |
US20050251246 |
申请日期 |
2005.10.14 |
申请人 |
SCHWEITZER ENGINEERING LABORATORIES, INC. |
发明人 |
FISCHER NORMANN |
分类号 |
G01R31/08;G01R31/00;G01R31/14;H02H9/08 |
主分类号 |
G01R31/08 |
代理机构 |
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主权项 |
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地址 |
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