发明名称 |
Method and apparatus for monitoring faults by means of a polygonal trigger region |
摘要 |
A method of, and apparatus for, monitoring faults at electrical lines, wherein there are formed a multiplicity of detection signals, and threshold monitoring the phase angle between timewise successive detection signals. According to a first aspect of the invention none of the detection signals has a magnitude equal to the line voltage signal. As a further aspect one of the detection signals can comprise an external signal. A still further feature contemplates that one of the detection signals is a difference signal formed by the line voltage signal and an external signal.
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申请公布号 |
US4249124(A) |
申请公布日期 |
1981.02.03 |
申请号 |
US19780890794 |
申请日期 |
1978.03.27 |
申请人 |
BBC BROWN, BOVERI & COMPANY, LIMITED |
发明人 |
DE MESMAEKER, IVAN |
分类号 |
G01R31/08;H02H3/38;H02H3/40;(IPC1-7):H02H3/38;G01R31/02 |
主分类号 |
G01R31/08 |
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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