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1. 发明公开

EP0999633A2 Earth-fault protection for electricity network 有权
标题翻译： Feelerstromschutz在einem elektrischen Verteilernetz
公开(公告)号：EP0999633A2
公开(公告)日：2000-05-10
申请号：EP99660172.0
申请日：1999-11-01
申请人： ABB Substation Automation Oy
发明人： Linqvist, Grels , Nymark, Kaj , Kuisti, Harri , Lehtonen, Niko
IPC分类号： H02H7/26 , H02H1/00
CPC分类号： H02H7/267 , H02H1/0015
摘要： A method and system for protecting an electricity network against restriking earth faults, which electricity network comprises one or more feeders (F1 and F2) going out from a supply point (S) and is preferably a three-phase (L1, L2 and L3) network, the method comprising the steps of: detecting an earth contact related to an earth fault in the electricity network, identifying the feeder (F2) on which the earth contact occurs by means of current pulses or current pulses and voltage values related to the earth contact, a current value being interpreted as a current pulse at the moment the instantaneous value of the current divided by the effective value of the current exceeds a predetermined limit, whereby the number of detected earth contacts is calculated per each feeder (F1 and F2), and it is identified that there is a restriking earth fault on the feeder (F1 or F2) if the number of the detected earth contacts per said feeder exceeds a predetermined number during a predetermined period, or if the number of the detected earth contacts per said feeder exceeds a predetermined number while the voltage between the star point of the electricity network and the earth, i.e. the zero voltage, remains above a predetermined limit.
摘要翻译：一种用于保护电网防止再起弧接地故障的方法和系统，该电网包括从供电点（S）出来的一个或多个馈线（F1和F2），并且优选地是三相（L1，L2和L3）网络，所述方法包括以下步骤：检测与所述电网中的接地故障相关的接地接触，通过电流脉冲或电流脉冲以及与地球相关的电压值来识别发生接地触点的馈线（F2）在电流的瞬时值除以电流的有效值超过预定极限的时刻将电流值解释为电流脉冲，由此每个馈线（F1和F2）计算检测到的接地触点数，，并且如果在预定的perio期间每个所述进料器检测到的接地触头的数量超过预定数量，则识别出馈线（F1或F2）上存在再起弧接地故障 d，或者如果每个所述馈线的检测到的接地触头的数量超过预定数量，同时电网的星点与地之间的电压即零电压保持在预定极限以上。

2. 发明公开

EP0963025A3 Faulted feeder detection in earth fault in electricity distribution network 有权
标题翻译：在配电系统在接地故障出现故障的电力电缆的检测
公开(公告)号：EP0963025A3
公开(公告)日：2002-12-04
申请号：EP99660092.0
申请日：1999-05-27
申请人： ABB Substation Automation Oy
发明人： Nymark, Kaj , Linqvist, Grels
IPC分类号： H02H3/38 , H02H7/26
CPC分类号： H02H3/382 , H02H3/081 , H02H9/08
摘要： A method for detecting a faulted feeder in an earth fault situation in an electricity distribution network, the electricity distribution network being multiphased (L1, L2 and L3) and comprising at least one supply point (HV/MV) having at least two feeders, the method comprising the steps of measuring voltage between a star point of the electricity distribution network and earth, i.e. zero voltage or a variable in a known phase shift therewith, measuring feeder-specifically a sum current (Σ|1, Σ|2) of feeder phases, i.e. zero current, comparing feeder-specifically a phase angle of the feeder zero current (Σ|1, Σ|2) with a phase angle of zero voltage or of a variable in a known phase shift therewith, detecting a feeder faulted if the phase angle of the feeder zero current (Σ|1, Σ|2) is within a given predetermined range when compared with zero voltage or the phase angle of the variable in a known phase shift therewith, whereby said predetermined range substantially exceeds 180° and the same predetermined range can be used for detecting a faulted feeder at least in two of the following alternative star point treatment methods in an electricity distribution network: a network isolated from earth, a network earthed via resistance at the star point, a network provided with an arc-suppression coil of earth-fault current or a combination of the two previous ones.

3. 发明公开

EP0999633A3 Earth-fault protection for electricity network 有权
标题翻译：在配电系统故障电流保护
公开(公告)号：EP0999633A3
公开(公告)日：2001-04-18
申请号：EP99660172.0
申请日：1999-11-01
申请人： ABB Substation Automation Oy
发明人： Linqvist, Grels , Nymark, Kaj , Kuisti, Harri , Lehtonen, Niko
IPC分类号： H02H7/26 , H02H1/00
CPC分类号： H02H7/267 , H02H1/0015
摘要： A method and system for protecting an electricity network against restriking earth faults, which electricity network comprises one or more feeders (F1 and F2) going out from a supply point (S) and is preferably a three-phase (L1, L2 and L3) network, the method comprising the steps of: detecting an earth contact related to an earth fault in the electricity network, identifying the feeder (F2) on which the earth contact occurs by means of current pulses or current pulses and voltage values related to the earth contact, a current value being interpreted as a current pulse at the moment the instantaneous value of the current divided by the effective value of the current exceeds a predetermined limit, whereby the number of detected earth contacts is calculated per each feeder (F1 and F2), and it is identified that there is a restriking earth fault on the feeder (F1 or F2) if the number of the detected earth contacts per said feeder exceeds a predetermined number during a predetermined period, or if the number of the detected earth contacts per said feeder exceeds a predetermined number while the voltage between the star point of the electricity network and the earth, i.e. the zero voltage, remains above a predetermined limit.

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