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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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2.发明公开METHOD AND APPARATUS FOR DETECTING A FAULT IN A NEUTRAL RETURN LINE OF AN ELECTRICAL NETWORK 审中-公开方法和装置的误差在电网的中性BACK线处的检测
公开(公告)号：EP2232279A1
公开(公告)日：2010-09-29
申请号：EP08800007.0
申请日：2008-09-17
CPC分类号： H02H5/10 , G01R31/026 , H02H3/17
摘要： Apparatus is disclosed for detecting a discontinuity or irregularity in a neutral return line of an electrical power distribution network including the neutral return line, an active line and an earth return. The apparatus includes means for measuring a voltage change associated with a deliberate switching of a known impedance in the electrical network wherein the voltage change is due to a discontinuity or impedance irregularity in the neutral return line and means for implementing an algorithm for identifying the discontinuity or impedance irregularity in presence of allowable variations in nominal supply voltage to the electrical network including voltage changes resulting from network operations that mimic or hide a discontinuity or impedance irregularity in the neutral return line. The apparatus also 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 irregularity in a neutral return line of an electrical power distribution network is also disclosed.
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