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公开(公告)号：US1776130A
公开(公告)日：1930-09-16
申请号：US30697228
申请日：1928-09-19
申请人： GEN ELECTRIC
IPC分类号： H02H3/30
CPC分类号： H02H3/307
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公开(公告)号：US1698337A
公开(公告)日：1929-01-08
申请号：US11807726
申请日：1926-06-23
申请人： REYROLLE A & CO LTD
IPC分类号： H02H3/30
CPC分类号： H02H3/307
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公开(公告)号：US1468441A
公开(公告)日：1923-09-18
申请号：US58719422
申请日：1922-09-09
申请人： GEN ELECTRIC
IPC分类号： H02H3/30
CPC分类号： H02H3/305
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公开(公告)号：US10969417B2
公开(公告)日：2021-04-06
申请号：US16169055
申请日：2018-10-24
发明人： Cezary Dzienis , Andreas Jurisch
摘要： A method detects a fault on a line of an electrical power supply system, in which current values are measured at the line ends of the line and the current values are used to check whether there is a fault on the line. In order to perform monitoring of the line such that faults can be detected comparatively quickly and sensitively, it is proposed that voltage values are also measured at the line ends. The respective measured current and voltage values are used to ascertain respective comparison current values indicating the current flowing at a comparison location on the line and the respective comparison current values are used to check for the presence of a fault on the line, and a fault signal is generated if the check has resulted in a fault present on the line being detected.
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公开(公告)号：US10305273B2
公开(公告)日：2019-05-28
申请号：US15402322
申请日：2017-01-10
发明人： Xuancai Zhu , Jianming Chen , Bingwen Weng , Zhiying Zhao
摘要： Disclosed are a photovoltaic system and its rapid shutdown method. The photovoltaic system includes a photovoltaic array including a photovoltaic array panel and a shutdown device, a junction box and an inverter, the shutdown device is electrically connected to the photovoltaic array panel and is connected to the inverter; the photovoltaic system further includes a shutdown device controller, which is coupled to the high voltage wires, and is configured for receiving a first detection signal reflecting a state of the AC side of the inverter, determining whether the AC side of the inverter is in a power-off state, outputting a first power-off signal when the AC side of the inverter is in the power-off state, and transferring the first power-off signal to the shutdown device; and the shutdown device receives the first power-off signal and prohibits the electric energy from transferring to the inverter.
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76.发明申请公开(公告)号：US20170331279A1
公开(公告)日：2017-11-16
申请号：US15526802
申请日：2014-11-14
发明人： FRANK MIESKE
CPC分类号： H02H7/0455 , G01R19/165 , G01R31/025 , H02H3/30 , H02H7/045 , H02H7/065 , H02J3/00
摘要： A differential protection method for generating a fault signal includes measuring current measurements at least at two different measuring points of a multiphase transformer for each phase. The current measurements for each phase are used to form differential current values and stabilization values. The fault signal is generated if it is determined during a trigger region check that a measurement pair of at least one of the phases, being formed by using one of the differential current values and the associated stabilization value in each case, is in a predefined trigger region. In order to be able to selectively and reliably distinguish an external fault from an internal fault, the transformer has a grounded star point and a zero system current flowing through the star point is used to form the stabilization values. A corresponding differential protection device is provided for performing the differential protection method.
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公开(公告)号：US09667058B2
公开(公告)日：2017-05-30
申请号：US15120191
申请日：2014-03-17
申请人： ABB Schweiz AG
发明人： Niclas Johannesson
CPC分类号： H02H7/265 , G01R19/2513 , G01R31/025 , G01R31/085 , H02H3/305
摘要： A method in a power system which includes a protected unit, such as a transmission line, adapted to convey power from a first position in the protected unit to a second position in the protected unit, or vice versa, via a plurality of conductors. A first travelling wave differential current (ITWdiff) is determined based on a comparison between a determined first travelling wave current or a second travelling wave current in first and second positions and an estimation of the first travelling wave current or the second travelling wave current, respectively. The estimation is carried out using a propagation function which takes into account any distortion, attenuation and/or delay of the waveform of a wave due to propagation of the wave in the protected unit. A second or normalized travelling wave differential current (ITWdiff) is determined by means of, based on the propagation function, adjusting at least one of magnitude and phase of the first travelling wave differential current such that all modes attain equal or increasingly equal modal characteristics. The method may facilitate or enable mitigating or even eliminating any false differential current in elements of a travelling wave differential current vector which correspond to healthy conductors, caused by coupling effects between conductors.
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78.发明授权公开(公告)号：US09042412B2
公开(公告)日：2015-05-26
申请号：US13390962
申请日：2009-12-31
申请人： Bin Su , Youyi Li , Torbjorn Einarsson
发明人： Bin Su , Youyi Li , Torbjorn Einarsson
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.
摘要翻译： 本发明提供一种用于检测传输线路保护装置之间的通信信道延迟不对称的方法和装置。 该方法包括：重复地计算保护装置的时钟之间的时钟差异和在通信信道的不同路径处的通信延迟; 将最新计算的时钟差异和通信延迟与先前计算的时钟差异和通信延迟进行比较; 如果所计算的时钟视差的改变超过第一阈值或者所计算的任何路径的通信延迟的改变超过第二阈值，则确定频道切换已经发生; 以及如果在频道切换之后所计算的不同路径的通信延迟之间的差超过第三阈值，则将所述信道延迟确定为不对称。
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公开(公告)号：US08908780B2
公开(公告)日：2014-12-09
申请号：US13126958
申请日：2009-03-25
申请人： Atsushi Takeuchi , Masanori Shimada
发明人： Atsushi Takeuchi , Masanori Shimada
摘要： According to one embodiment, a protective relay performs the following steps. A/D converter 11 acquires an electric current of a power transmission line 4 via a CT 5. A computing part 12 performs various protection computations such as current differential computation using a current data measured at the end of itself and a current data measured at the opposite end. A transmitting and receiving circuit 13 transmits the current data of itself to the other protective relay 1 at the opposite end via a transmission path 3. A received level detection part 14 detects the received level of the transmission data that has been transmitted from the opposite end and received by the transmitting and receiving circuit 13. A transmission level control part 15, based on the difference between the received level that has been detected within a definite time t1 after the establishment of data transmission to the other protective relay 1 and a predetermined received level, performs transmission level reduction control after the passage of the definite time t1.
摘要翻译： 根据一个实施例，保护继电器执行以下步骤。 A / D转换器11经由CT5获取电力传输线路4的电流。计算部分12执行各种保护计算，例如使用在其自身端部测量的当前数据的当前差分计算和在 对面 发送和接收电路13经由传输路径3将其自身的当前数据发送到相对端的另一保护继电器1.接收电平检测部分14检测从相对端发送的发送数据的接收电平 并且由发送和接收电路13接收。发送电平控制部分15基于在向另一个保护中继1建立数据传输之后的确定时间t1内检测到的接收电平之间的差和预定的接收 在定时t1之后进行传输电平降低控制。
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80.发明授权
公开(公告)号：US4675775A
公开(公告)日：1987-06-23
申请号：US808769
申请日：1985-12-13
申请人： Shan C. Sun , Russell W. Gonnam
发明人： Shan C. Sun , Russell W. Gonnam
摘要： Active pilot wire apparatus for replacing a passive continuous metallic wire pair coupling between the electromechanical units of a conventional electromechanical pilot wire protective relay is disclosed. For the protection of a power line section, an electromechanical unit is coupled to each end thereof. Each electromechanical unit includes an operating relay coil which when energized operates breaker contacts to interrupt current through the protected power line section. A signal representative of the potential across the operating coil of each electromechanical unit is transmitted through an active communication channel to the other electromechanical unit where it is buffered by a high impedance amplifier. In each case, the output signal of the buffer amplifier is representative substantially of the corresponding operating relay coil potential. An impedance element is coupled between each buffer amplifier and the other operating relay coil. Current is diverted from the operating relay coil of each electromechanical unit through the corresponding coupled impedance element in accordance with the potential of the signals coupled thereacross. The active pilot wire apparatus may be extended to the coupling of a plurality of electromechanical units to form a current differential protective relay operative to protect against faults in a corresponding plurality of sets of power lines with each set constituting a current path of a power system network.
摘要翻译： 公开了一种用于替代常规机电导线保护继电器的机电单元之间的被动连续金属线对耦合的主动导线装置。 为了保护电力线部分，机电单元耦合到其每端。 每个机电单元包括操作继电器线圈，其在通电时操作断路器触点以中断通过受保护电力线部分的电流。 表示每个机电单元的操作线圈两端的电位的信号通过有源通信信道传输到另一个机电单元，在那里它被高阻抗放大器缓冲。 在每种情况下，缓冲放大器的输出信号基本上代表相应的操作继电器线圈电位。 阻抗元件耦合在每个缓冲放大器和另一个操作继电器线圈之间。 根据耦合到其上的信号的电位，电流通过相应的耦合阻抗元件从每个机电单元的操作继电器线圈转向。 有源引导线装置可以扩展到多个机电单元的耦合，以形成电流差动保护继电器，其可操作用于防止相应的多组电力线路中的故障，每组电力线组构成电力系统网络的电流路径 。
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