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2. 发明公开

EP2628015A1 FAULT DIRECTION PARAMETER INDICATOR DEVICE USING ONLY CURRENT AND RELATED METHODS 有权转让
标题翻译：显示设备以电动及相关程序独家使用故障方向参数
公开(公告)号：EP2628015A1
公开(公告)日：2013-08-21
申请号：EP11770757.0
申请日：2011-10-14
申请人： ABB Research Ltd.
发明人： UKIL, Abhisek , DECK, Bernhard , SHAH, Vishal H.
IPC分类号： G01R31/08 , H02H3/26 , H02H3/08
CPC分类号： G01R31/08 , G01R19/0092 , G01R31/025 , G01R31/085 , H02H3/081 , H02H3/265
摘要： A method of determining a fault direction parameter of a fault on an AC transmission line 10 of a power distribution system 1 relative to a measurement location 12 of the transmission line 10 is described. The method comprises: measuring by a measurement unit 20 a time- dependent AC current of the transmission line 10 at the measurement location 12, thereby obtaining time-domain current data 80 indicative of the measured current; the measurement unit 20 comprising a current sensor for measuring the current at the measurement location 12 of the transmission line 10 but no voltage sensor; transmitting the current data to a decision logic section 36; obtaining a fault time 81 of the fault on the AC transmission line 10; identifying a first time tl and a second time t2 by identifying a periodically re-occurring feature of the current data 80, such that the fault time 81 is between the first time tl and the second time t2, wherein the periodically re-occurring feature is selected from the group consisting of a zero-crossing, a maximum, a minimum, a highest gradient of the current data; extracting, from the current data 80, an offset indicative parameter 82; 86, 87 indicative of a time offset 8Γ of the current at the fault time 81 wherein the offset indicative parameter 82 is a time interval between the first time t1 and the second time t2; calculating an offset direction parameter by comparing the offset indicative parameter 82; 86, 87 to a non-offset indicative parameter 84; and establishing the fault direction parameter based on the calculated offset direction parameter.

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