发明名称 |
Protection of electrical power supply systems |
摘要 |
A fault in a section of an electrical power supply line is detected by measurement of voltage and current, filtering out high frequency components, and calculating approximations of Fourier transforms of a time window of the voltage and current at a predetermined frequency modified by a continuous phase change at that frequency and then calculating the impedance of the section from the modified Fourier transforms of voltage and current (FIG. 2).
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申请公布号 |
US4617636(A) |
申请公布日期 |
1986.10.14 |
申请号 |
US19830471333 |
申请日期 |
1983.03.02 |
申请人 |
NATIONAL RESEARCH DEVELOPMENT CORPORATION |
发明人 |
JOHNS, ALLAN T.;MARTIN, MICHAEL A. |
分类号 |
H02H3/40;(IPC1-7):G01R31/08;G01R27/08;H02H3/42 |
主分类号 |
H02H3/40 |
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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