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公开(公告)号：US11355919B2
公开(公告)日：2022-06-07
申请号：US17143278
申请日：2021-01-07
发明人： Shigetoo Oda
摘要： A current differential relay apparatus includes a first relay and a second relay. The first relay calculates a first differential current and a first suppression current, using a first current and a second current, and performs a ratio differential relay operation based on the first differential current and the first suppression current. The second relay calculates a maximum of results of add operations of the first current and the second current as a second differential current, calculates an add operation of the maximum of the first current and a maximum of the second current as a second suppression current, and performs a ratio differential relay operation based on the second differential current and the second suppression current. The current differential relay apparatus includes an output controller that outputs an operation signal based on results of operations performed by the first and second relays.
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公开(公告)号：US11005261B2
公开(公告)日：2021-05-11
申请号：US16330019
申请日：2017-08-30
摘要： A control method allows the control of an installation for transmitting electricity comprising a DC transmission network including a group of electricity transmission lines that are linked to one another. The method allows the opening of at least one N-1 safety system, for each safety system being opened, the contribution to the flow of current through the group of transmission lines, originating from the converter station associated with the safety system that is opened, is removed. Furthermore, the method also allows a search for the short-circuit fault in order to identify the faulty transmission line, and an operation, implemented after identification of the faulty transmission line by the search step, of isolating the faulty transmission line by opening the line circuit breakers of the faulty transmission line.
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公开(公告)号：US10923901B2
公开(公告)日：2021-02-16
申请号：US15571292
申请日：2015-06-12
发明人： Shigetoo Oda
IPC分类号： H02H3/00 , H02H9/08 , H02H3/05 , H02H3/04 , H02H3/30 , H02H3/28 , G01R15/18 , H02H1/00 , H02H3/08
摘要： In a protective relay device, a current differential relay computation unit determines whether or not a fault has occurred within a protected section based on an operating quantity and a restraint quantity. A disconnection detection unit computes a first amount of difference by subtracting the operating quantity a certain time period ago from the operating quantity at a present point in time, computes a second amount of difference by subtracting the restraint quantity the certain time period ago from the restraint quantity at the present point in time, and determines that a disconnection has occurred at one of first and second current transformers when a first determination condition that an absolute value of a sum of the first amount of difference and the second amount of difference is equal to or smaller than a first set value is satisfied.
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公开(公告)号：US10749335B2
公开(公告)日：2020-08-18
申请号：US16097340
申请日：2017-04-11
发明人： John Westwood , Yanzhong Zhang
摘要： There is provided a method of operating a reconfigurable differential protection scheme for carrying out differential protection of an electrical power network, the electrical power network comprising terminals, each of the terminals configured to be in communication with each other within a communications network. The method includes controlling the differential protection scheme to deactivate the differential protection, and selecting a terminal to be configured out of or into the differential protection scheme. The method also includes communicating reconfiguration information among the terminals, the reconfiguration information including the selection of the terminal to be configured out of or into the differential protection scheme. The method also includes modifying a respective differential protection algorithm at each of the non-selected terminals so as to configure the selected terminal out of or into the differential protection scheme, and controlling the differential protection scheme to reactivate the differential protection.
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公开(公告)号：US10598717B2
公开(公告)日：2020-03-24
申请号：US15405941
申请日：2017-01-13
发明人： Cezary Dzienis , Andreas Jurisch
摘要： A fault location of a fault on a line of an electrical energy supply network is determined from measured current and voltage values at the first and second line ends. Highly accurate fault location with measured values from both line ends is provided even in the absence of temporal synchronization of the measurements at the line ends. Characteristics of first and second fictitious fault voltage values present at a fictitious fault location on the line are defined using the first and second current and voltage values. A fictitious fault location is determined for which the characteristic of the first fictitious fault voltage values corresponds most closely to the characteristic of the second fictitious fault voltage values. The fictitious fault location is used as the actual fault location. We also describe a correspondingly configured device and a system for determining a fault location.
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公开(公告)号：US20190140440A1
公开(公告)日：2019-05-09
申请号：US16097340
申请日：2017-04-11
发明人： John WESTWOOD , Yanzhong Zhang
摘要： There is provided a method of operating a reconfigurable differential protection scheme for carrying out differential protection of an electrical power network, the electrical power network comprising terminals, each of the terminals configured to be in communication with each other within a communications network. The method includes controlling the differential protection scheme to deactivate the differential protection, and selecting a terminal to be configured out of or into the differential protection scheme. The method also includes communicating reconfiguration information among the terminals, the reconfiguration information including the selection of the terminal to be configured out of or into the differential protection scheme. The method also includes modifying a respective differential protection algorithm at each of the non-selected terminals so as to configure the selected terminal out of or into the differential protection scheme, and controlling the differential protection scheme to reactivate the differential protection.
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7.发明授权公开(公告)号：US10096991B2
公开(公告)日：2018-10-09
申请号：US15180638
申请日：2016-06-13
摘要： In one embodiment, a network protector for a spot network includes a circuit breaker and a network protector relay coupled to the circuit breaker. The network protector relay is structured and configured to have network protector relay non-sensitive trip settings for controlling operation of the circuit breaker that will cause the network protector to remain closed when: (i) an angular difference (±) between a transformer phase-to-neutral voltage of the first feeder branch and a transformer phase-to-neutral voltage of the second feeder branch is less than or equal to a first threshold value, and (ii) a magnitude difference (±) between the transformer phase-to-neutral voltage of the feeder branch and the transformer phase-to-neutral voltage of the second feeder branch is less than or equal to a second threshold value.
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公开(公告)号：US20180241203A1
公开(公告)日：2018-08-23
申请号：US15866508
申请日：2018-01-10
摘要： An over-current protection apparatus constituted of: a transistor disposed on a substrate; a first thermal sense device arranged to sense a temperature reflective of a junction temperature of the transistor; a second thermal sense device arranged to sense a temperature reflective of a temperature of a casing surrounding the substrate; and a control circuitry, arranged to alternately: responsive to the sensed temperature by the first thermal sense device and the sensed temperature of the second thermal sense device being indicative that the temperature difference between the transistor junction and the substrate casing is greater than a predetermined value, switch off the transistor; and responsive to the sensed temperature by the first thermal sense device and the sensed temperature by the second thermal sense device being indicative that the temperature difference between the transistor junction and the substrate casing is not greater than the predetermined value, switch on the transistor.
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公开(公告)号：US20180062379A1
公开(公告)日：2018-03-01
申请号：US15675996
申请日：2017-08-14
发明人： Xuancai ZHU , Bingwen WENG , Jianming CHEN , Yafeng LIAO , Jinfa ZHANG
CPC分类号： H02H3/305 , H01L31/02021 , H02H1/0061 , H02H7/20 , H02J3/383 , Y02B10/14
摘要： A photovoltaic power generation system includes a plurality of photovoltaic arrays, a plurality of shutdown units and an inverter. The shutdown unit is adjacent to the corresponding photovoltaic array, connected in parallel with the corresponding photovoltaic array, and electrically connected to the inverter via high voltage wires; the photovoltaic power generation system further includes a control unit configured to receive a detection signal indicating a state of the AC side of the inverter, monitor whether the AC side of the inverter is in a power-off state according to the detection signal, and generate a first power-off signal when the AC side of the inverter is in the power-off state; and the shutdown units are configured to receive the first power-off signal, and stop a power transmission from the photovoltaic arrays to the inverter according to the first power-off signal.
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公开(公告)号：US6148267A
公开(公告)日：2000-11-14
申请号：US2433
申请日：1998-01-02
CPC分类号： G01R19/2513 , H02H3/302
摘要： A method for internal fault detection comprises determining whether a local current on a local transmission line terminal exceeds a variable first fault level threshold; if so, determining whether a remote current on a remote transmission line terminal exceeds a variable second fault level threshold; and if so, comparing phases of the local and remote currents. The method can include determining local and remote uncertainty factors for the local and remote currents and using the uncertainty factors to adjust the variable thresholds. The method can further include measuring a current on a local transmission line terminal and bandpass filtering the measured current to obtain the local current.
摘要翻译： 一种用于内部故障检测的方法，包括：确定本地传输线路终端上的本地电流是否超过可变的第一故障级别阈值; 如果是，则确定远程传输线路终端上的远程电流是否超过可变的第二故障等级阈值; 如果是，比较本地和远端电流的相位。 该方法可以包括确定本地和远程电流的局部和远程不确定因素，并使用不确定因素来调整可变阈值。 该方法还可以包括测量本地传输线路终端上的电流，并对测量的电流进行带通滤波以获得局部电流。
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