公开(公告)号：US09106076B2

公开(公告)日：2015-08-11

申请号：US13929112

申请日：2013-06-27

Applicant: ABB Technology AG

Inventor： Mika Tausa ,  Kari Vanhala

IPC: H02H3/34 ,  H02H7/045 ,  H02H3/347 ,  H02H3/28

CPC classification number: H02H3/343 ,  H02H3/283 ,  H02H3/347 ,  H02H7/045 ,  H02H7/0455

Abstract: A method in a three-terminal differential protection includes measuring a terminal phase current (IT1(y), IT2(y), IT3(y)) at each terminal (T1, T2, T3) of a protected zone of the differential protection in each phase (L1, L2, L3) to be protected, and determining a bias current (Ib(y)) of the phase on the basis of the terminal phase currents (IT1(y), IT2(y), IT3(y)). The bias current determination includes subtracting phasor values of the terminal phase currents of two terminals from the phasor value of the terminal phase current of one terminal. The terminal phase current, which is a minuend in the phasor difference computation, is selected on the basis of the phase angles or amplitudes of the terminal phase currents.

Abstract translation: 三端差动保护中的方法包括测量差动保护的保护区的每个端子（T1，T2，T3）处的端相相电流（IT1（y），IT2（y），IT3（y）） 根据终端相电流（IT1（y），IT2（y），IT3（y））确定相位的偏置电流（Ib（y））， ）。 偏置电流确定包括从一个端子的端子相电流的相量值中减去两个端子的端子相电流的相量值。 基于相位电流的相位角或振幅，选择相量差计算中的终端相电流。

公开(公告)号：US09478966B2

公开(公告)日：2016-10-25

申请号：US14136926

申请日：2013-12-20

Applicant: ABB Technology AG

Inventor： Kari Vanhala ,  Petri Koivula

IPC: H02H7/09 ,  G01R31/42 ,  H02H1/00 ,  H02J3/40 ,  H02J3/38

CPC classification number: H02H1/0007 ,  H02J3/40 ,  H02J2003/388

Abstract: A protection relay is provided for protection of an electric network. The protection relay measures an electric signal in the network, converts the measured signal to a frequency domain representation of the measured signal, and generates a measuring phasor based on the frequency domain representation, where the phase rotation of the measuring phasor is dependent on one or more frequency components present in the measured electric signal. The protection relay compares the measuring phasor to the reference phasor, where the phase rotation of the reference phasor is based on either a nominal or a measured frequency of the electric network, and launches protection if the comparison of the of the measuring phasor and the reference phasor fulfils a predetermined criterion.

Abstract translation: 提供保护继电器以保护电网。 保护继电器测量网络中的电信号，将测量的信号转换成测量信号的频域表示，并且基于频域表示产生测量相量，其中测量相量的相位旋转取决于一个或 在测量的电信号中存在更多的频率分量。 保护继电器将测量相量与参考相量进行比较，其中参考相量的相位旋转基于电网的标称或测量频率，并且如果测量相量与参考值的比较，则启动保护 相量达到预定的标准。