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1.发明公开METHOD AND APPARATUS FOR DETECTING A FAULT IN AN ACTIVE LINE, NEUTRAL RETURN LINE OR EARTH RETURN PATH OF AN ELECTRICAL NETWORK 审中-公开方法和设备检测到故障在活动线，中性回路线或者EARTH电网络的返回路径
公开(公告)号：EP2419748A1
公开(公告)日：2012-02-22
申请号：EP09813914.0
申请日：2009-12-18
发明人： MYERS, Erickson, Bruce , HOLTER, Bryan, Douglas , GODWIN, William, John , HUTCHINSON, Stanley, Edward, Thomas
CPC分类号： H02H5/10 , G01R31/026
摘要： Apparatus is disclosed for detecting a discontinuity or impedance irregularity in an active line, a neutral return line and/or an earth return path of an electrical power distribution network. The apparatus includes means for measuring a change in voltage and/or current flow associated with a deliberate switching of a known impedance and/or a naturally occurring random switching of an impedance in the electrical network wherein the change in voltage and/or current flow is due to a discontinuity or impedance irregularity in the active line, neutral line and/or earth return path. The apparatus also includes means for implementing a first algorithm for identifying the discontinuity or impedance irregularity in presence of allowable variation in voltage and/or current flow that may mimic or hide a discontinuity or impedance irregularity in the active line, neutral return line and/or earth return path including a reverse current flow through the earth return path. The apparatus further includes means for comparing a result of the measuring with a reference to provide an indication of the discontinuity or impedance irregularity. A method for detecting a discontinuity or impedance irregularity in an active line, a neutral return line and/or an earth return path of an electrical power distribution network is also disclosed.
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