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    FAULT MONITORING METHOD FOR MULTI-PORT INTERNAL PASSIVE LOAD-FREE PROBABILISTIC LOAD FLOW ELECTRIC NETWORK
    1.
    发明公开
    FAULT MONITORING METHOD FOR MULTI-PORT INTERNAL PASSIVE LOAD-FREE PROBABILISTIC LOAD FLOW ELECTRIC NETWORK 审中-公开

    公开(公告)号：US20240213755A1

    公开(公告)日：2024-06-27

    申请号：US18288688

    申请日：2022-02-21

    申请人： BAODING YUXIN ELECTRIC TECHNOLOGY CO., LTD.

    发明人： Zhanyu XUE ,  Jinchun XING

    IPC分类号： H02H1/00 ,  H02H3/30 ,  H02H3/33 ,  H02H7/26

    CPC分类号： H02H1/0007 ,  H02H1/0061 ,  H02H3/30 ,  H02H7/261 ,  H02H3/33

    摘要： Disclosed is a fault monitoring method for a multi-port internal passive load-free probabilistic load flow (PLF) electric network. Current transformers are installed on the conductors. Currents from the current transformers are transformed into voltages, and the voltages are then converted into pulses by a voltage-to-frequency conversion (VFC) circuit. The pulses are transmitted via optical fiber to a comparison module, and an algebraic sum of all pulse counts is calculated. It is stipulated that when an installation direction of the current transformer is the same as a direction of the port pointing to the PLF electric network, the pulse count is positive, and when the installation direction of the current transformer is opposite to the direction of the port pointing to the PLF electric network, the pulse count is negative. When the algebraic sum exceeds a threshold, it is determined that a fault has occurred within the PLF electric network. This method is designed for an electric network where the direction of power transmission is uncertain, and can promptly and accurately detect whether faults such as single-phase grounding and interphase short-circuiting have occurred within the electric network. The method achieves advantages such as fast fault response, and precise and timely detection.

    Secured fault detection in a power substation
    3.
    发明授权
    Secured fault detection in a power substation 有权

    公开(公告)号：US11728640B2

    公开(公告)日：2023-08-15

    申请号：US16838766

    申请日：2020-04-02

    申请人： Hitachi Energy Switzerland AG

    发明人： Tao Cui ,  Reynaldo Nuqui ,  Dmitry Ishchenko ,  Zhenyuan Wang

    IPC分类号： H02H7/26 ,  H02H7/28 ,  G01R31/08 ,  H02H1/04

    CPC分类号： H02H7/28 ,  H02H7/261 ,  G01R31/08 ,  H02H1/04 ,  H02H1/043 ,  H02H1/046

    摘要： Systems and methods for fault detection and protection in electric power systems that evaluates electromagnetic transients caused by faults. A fault can be detected using sampled data from a first monitored point in the power system. Detection of fault transients and associated characteristics, including transient direction, can also be extracted through evaluation of sample data from other monitored points in the power system. A monitoring device can evaluate whether to trip a switching device in response to the detection of the fault and based on confirmation of an indication of detection of fault transients at the other monitored points of the power system. The determination of whether to trip or activate the switching device can also be based on other factors, including the timing of receipt of an indication of the detection of the fault transients and/or an evaluation of the characteristics of the detected transients.

    Method for locating and isolating a fault in a power distribution network
    4.
    发明授权
    Method for locating and isolating a fault in a power distribution network 有权

    公开(公告)号：US11719736B2

    公开(公告)日：2023-08-08

    申请号：US17501136

    申请日：2021-10-14

    申请人： S&C Electric Company

    发明人： Boris Marendic ,  Yoav Sharon

    IPC分类号： G01R31/08 ,  H02H3/06 ,  H02H7/26

    CPC分类号： G01R31/086 ,  H02H3/063 ,  H02H7/261

    摘要： A method for fault location and isolation in a power distribution network, where the network includes a plurality of switching devices provided along a feeder, and at least one of the switching devices does not have voltage sensing capabilities. The method includes detecting an overcurrent event in the network from the fault and interrupting the overcurrent event by opening and then immediately locking out or subsequently reclosing and testing the fault. A count value is increased in each switching device that detected the overcurrent event. A message is sent from each of the switching devices that detected the overcurrent event and then detected the loss of voltage upstream to an upstream neighbor switching device. Current measurements in the messages, measured current by the devices and the counts values in the devices determine what devices are opened to isolate the fault.

    ZONE SELECTIVE INTERLOCKING TEST APPARATUS
    7.
    发明申请
    ZONE SELECTIVE INTERLOCKING TEST APPARATUS 审中-公开

    公开(公告)号：US20180095130A1

    公开(公告)日：2018-04-05

    申请号：US15831656

    申请日：2017-12-05

    申请人： EATON CORPORATION

    发明人： ALEC DANE BURKLE

    IPC分类号： G01R31/327 ,  H02H7/26

    CPC分类号： G01R31/3275 ,  G01R31/3274 ,  H02H3/08 ,  H02H3/32 ,  H02H7/261 ,  H02H7/30

    摘要： A ZSI testing apparatus includes a fault generation circuit, a plurality of cable assemblies coupled to the fault generation circuit, wherein the cable assemblies are structured to be selectively coupled to selected circuit interrupters, a human machine interface, and a controller coupled. The controller is configured to: (i) selectively cause a fault current to be provided to a number of the cable assemblies, (ii) receive an input from each circuit interrupter that is coupled to one of the cable assemblies, each input being indicative of a trip signal output of the circuit interrupter, (iii) determine based on the received inputs (a) that an error has occurred with respect to operation of the circuit interrupters and (b) a recommendation for fixing the error, and (iv) cause an output indicative of the error and the recommendation to be provided on the human machine interface.

    POWER SUPPLY APPARATUS
    9.
    发明申请
    POWER SUPPLY APPARATUS 审中-公开

    公开(公告)号：US20170264204A1

    公开(公告)日：2017-09-14

    申请号：US15455538

    申请日：2017-03-10

    申请人： ROHM CO., LTD.

    发明人： Kenichi MOTOKI

    IPC分类号： H02M3/335 ,  H02M1/08 ,  H02M1/32

    CPC分类号： H02M3/33523 ,  H02H3/08 ,  H02H7/1216 ,  H02H7/261 ,  H02M1/08 ,  H02M1/32 ,  H02M3/335 ,  H02M2001/0009

    摘要： A power supply apparatus supplies a bus voltage VBUS to a power receiving apparatus via a cable. A power supply circuit generates the bus voltage VBUS. The bus switch SW is arranged on a path of a bus line extending from the output of the power supply circuit. A power supply side controller is capable of communicating with a power receiving side controller of the power receiving apparatus. The power supply side controller determines the voltage to be supplied, based on a negotiation result. Furthermore, the power supply side controller controls the bus switch SW. When a predetermined state repeatedly occurs in the power supply circuit, a short circuit detection circuit judges that a short-circuit abnormality has occurred.