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公开(公告)号：EP2638611A4
公开(公告)日：2017-12-20
申请号：EP10859587
申请日：2010-11-09
申请人： ABB RESEARCH LTD
发明人： LI YOUYI , SU BIN , YANG YING , EINARSSON TORBJORN , GAJIC ZORAN
CPC分类号： H03L7/08 , H02H3/283 , H02H3/30 , H02H7/263 , H04J3/0667
摘要： A synchronization method for current differential protection comprises: selecting a point on the transmission line protected by the current differential protection; measuring the current and the voltage of each of the terminals of said transmission line; calculating the compensating voltage at the selected point respectively according to the measured current and the voltage of the each terminal; detecting and calculating the synchronization error by comparing all the compensating voltages.
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2.发明公开METHOD FOR DETECTING NETWORK ASYMMETRICAL STATUS AND ASYMMETRICAL COMMUNICATION CHANNELS FOR POWER SYSTEM 有权法非对称网络地位的动力系统检测与不对称通信渠道
公开(公告)号：EP2394401A4
公开(公告)日：2016-10-12
申请号：EP09839505
申请日：2009-02-09
申请人： ABB RESEARCH LTD
CPC分类号： H04L43/0852 , H04J3/0638 , H04J3/085 , H04J2203/0042 , H04J2203/006 , H04J2203/0062 , H04L12/437
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公开(公告)号：EP2520040A4
公开(公告)日：2017-12-20
申请号：EP09852745
申请日：2009-12-31
申请人： ABB RESEARCH LTD
发明人： SU BIN , LI YOUYI , EINARSSON TORBJORN
CPC分类号： H04J3/0682 , H02H1/0061 , H02H3/30 , H04J3/065 , H04J3/0658
摘要： The invention provides a method and apparatus for detecting communication channel delay asymmetry between transmission line protection devices. The method comprises: calculating, repeatedly, clock disparity between clocks of the protection devices and communication delays at different paths of the communication channel; comparing the latest calculated clock disparity and communication delays with previously calculated clock disparities and communication delays, respectively; determining a channel switching has happened if a change of the calculated clock disparity exceeds a first threshold, or a change of the calculated communication delays for any path exceeds a second threshold; and determining the channel delays as asymmetrical if a difference between the calculated communication delays of the different paths after the channel switching exceeds a third threshold.
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