公开(公告)号：US09270107B2

公开(公告)日：2016-02-23

申请号：US13920653

申请日：2013-06-18

Applicant: ABB TECHNOLOGY LTD

Inventor： Ylinen Juha ,  Shah Nayan ,  Kandakatta Murali

IPC: H02H3/00 ,  H02H7/04 ,  H02H7/045

CPC classification number: H02H7/042 ,  H02H7/045

Abstract: A method and device are disclosed for supervising the operation of plural current transformers and for prevention of a malfunction, such as false tripping of power in an electrical system. Exemplary embodiments can include measuring current parameters (e.g., magnitude and phase angle) for each winding in current transformer (CT) sets. A negative sequence current can be calculated from measured phase currents and a fault condition determined. A phase angle difference parameter derived from phase measurements between two healthy CTs can be used as an additional condition parameter for reliable operation of equipment in the electrical system.

Abstract translation: 公开了一种用于监视多个电流互感器的操作并防止诸如电气系统中的电力虚假跳闸的故障的方法和装置。 示例性实施例可以包括测量电流互感器（CT）组中每个绕组的电流参数（例如，幅度和相位角）。 可以从测量的相电流和确定的故障条件计算负序电流。 可以使用从两个健康CT之间的相位测量得出的相位角差参数作为电气系统中设备可靠运行的附加条件参数。

公开(公告)号：US20130279048A1

公开(公告)日：2013-10-24

申请号：US13920653

申请日：2013-06-18

Applicant: ABB Technology Ltd

Inventor： Ylinen JUHA ,  Shah Nayan ,  Kandakatta Murali

IPC: H02H7/04

CPC classification number: H02H7/042 ,  H02H7/045

Abstract: A method and device are disclosed for supervising the operation of plural current transformers and for prevention of a malfunction, such as false tripping of power in an electrical system. Exemplary embodiments can include measuring current parameters (e.g., magnitude and phase angle) for each winding in current transformer (CT) sets. A negative sequence current can be calculated from measured phase currents and a fault condition determined. A phase angle difference parameter derived from phase measurements between two healthy CTs can be used as an additional condition parameter for reliable operation of equipment in the electrical system.

Abstract translation: 公开了一种用于监视多个电流互感器的操作并防止诸如电气系统中的电力虚假跳闸的故障的方法和装置。 示例性实施例可以包括测量电流互感器（CT）组中每个绕组的电流参数（例如，幅度和相位角）。 可以从测量的相电流和确定的故障条件计算负序电流。 可以使用从两个健康CT之间的相位测量得出的相位角差参数作为电气系统中设备可靠运行的附加条件参数。