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    METHOD AND APPARATUS FOR IDENTIFYING OPEN PHASE OF CIRCUIT BREAKER ON BASIS OF VOLTAGE
    2.
    发明公开
    METHOD AND APPARATUS FOR IDENTIFYING OPEN PHASE OF CIRCUIT BREAKER ON BASIS OF VOLTAGE 审中-公开
    用于根据电压识别断路器的开路相位的方法和设备

    公开(公告)号：EP3291401A1

    公开(公告)日：2018-03-07

    申请号：EP16785743.2

    申请日：2016-02-19

    申请人： NR Electric Co., Ltd. ,  NR Electric Engineering Co., Ltd.

    发明人： CHEN, Jun ,  WANG, Kai ,  ZHONG, Shouping ,  WANG, Guang ,  ZHANG, Qixue ,  CHEN, Jiasheng ,  GUO, Zigang ,  LI, Huazhong ,  JI, Yaoyao

    IPC分类号： H02H7/22

    CPC分类号： G01R31/3275 ,  G01R19/10 ,  G01R19/2509 ,  H02H1/0092 ,  H02H3/027 ,  H02H3/04 ,  H02H3/044 ,  H02H3/265 ,  H02H5/10 ,  H02H7/22

    摘要： A method and apparatus for identifying an open phase of a circuit breaker on the basis of voltage. The method comprises: a protection apparatus measures three-phase voltages (Ua, Ub, Uc, UA, UB, UC) at two sides (M, N) of a circuit breaker (B); respectively calculates a vector difference and an effective value of the voltages at two sides of the circuit breaker; when the phase voltages at two sides are both greater than 80% to 90% of a rated voltage, and the voltage vector difference at two sides of the one-phase or two-phase circuit breaker is greater than a set voltage, it is determined that the circuit breaker has an open phase; and actuates an alarming or tripping operation after a short time delay t. The method and the corresponding apparatus can solve the problem of the failure in recognizing an open phase by a traditional negative-sequence current criterion when a circuit breaker has an open phase in the case of light load; and moreover, three-phase inconsistent contact is not needed, and the method and apparatus are also suitable for a three-phase linked circuit breaker.

    摘要翻译： 一种基于电压识别断路器断相的方法和装置。 该方法包括：保护装置测量断路器（B）的两侧（M，N）处的三相电压（Ua，Ub，Uc，UA，UB，UC）; 分别计算断路器两侧电压的矢量差和有效值; 当两侧的相电压均大于额定电压的80％至90％，并且单相或两相断路器两侧的电压矢量差大于设定电压时， 断路器具有断相; 并在短时间延迟t后启动报警或跳闸操作。 该方法及相应装置可解决在轻载情况下断路器为断相时，传统负序电流判据识别断相失败的问题; 而且不需要三相不一致触点，该方法和装置也适用于三相联动断路器。

    OPTICAL CT-BASED STARTING STANDBY TRANSFORMER OPEN-PHASE DETECTION METHOD
    3.
    发明公开
    OPTICAL CT-BASED STARTING STANDBY TRANSFORMER OPEN-PHASE DETECTION METHOD 审中-公开

    公开(公告)号：EP3703210A1

    公开(公告)日：2020-09-02

    申请号：EP18905615.3

    申请日：2018-05-02

    申请人： NR Electric Co., Ltd. ,  NR Engineering Co., Ltd

    发明人： CHEN, Jiasheng ,  WANG, Guang ,  WANG, Kai ,  WANG, Yao ,  CHEN, Jun ,  ZHANG, Qixue ,  GUO, Zigang ,  LI, Huazhong

    IPC分类号： H02H7/04

    摘要： The present invention discloses a method for detecting open phase of a startup/standby transformer based on optical CT. A startup/standby transformer in a power plant is in a no-load condition for a long time as a standby power supply. Once a single-phase open phase fault occurs, there is no significant change in the voltage phasor and voltage sequence component of each side. If not found in time, the defect may pose a great threat to the safe operation of the power plant. In the present invention, the optical CT is used to detect a three-phase current of the high-voltage side of the startup/standby transformer. If the current satisfies an open phase criterion, it is determined that an open phase fault occurs, and then, an alarm signal is given after a delay and an operator is informed to handle the fault in time. Therefore, the operation reliability of the startup/standby transformer system in the power plant is enhanced.