公开(公告)号：US20170030958A1

公开(公告)日：2017-02-02

申请号：US15294238

申请日：2016-10-14

Applicant: ABB Schweiz AG

Inventor： Ziang Zhang ,  Ning Kang ,  Mirrasoul Mousavi

IPC: G01R31/02 ,  G01R31/06

CPC classification number: G01R31/027 ,  G01R31/06 ,  H02H7/045

Abstract: According to an embodiment of a power network device, the device includes a computer configured to estimate a plurality of parameters internal to a transformer, including estimating a turns ratio of the transformer. The computer performs the parameter estimation based on an equivalent circuit model of the transformer and current and voltage samples which correspond to current and voltage measurements taken at primary side and secondary side terminals of the transformer. The computer indicates when one or more of the estimated parameters deviates from a nominal value by more than a predetermined amount. The computer can be part of an intelligent electronic device configured to acquire analog or digital signals representing the primary side and secondary side current and voltage measurements, or located remotely from the intelligent electronic device e.g. in the control room or substation controller.

Abstract translation: 根据电力网络设备的实施例，该设备包括被配置为估计变压器内部的多个参数的计算机，包括估计变压器的匝数比。 计算机基于变压器的等效电路模型和电流和电压采样进行参数估计，这些样本对应于在变压器的初级侧和次级侧端子进行的电流和电压测量。 计算机指示估计参数中的一个或多个偏离标称值大于预定量的时间。 计算机可以是智能电子设备的一部分，其被配置为获取表示初级侧和次级侧电流和电压测量的或者位于远离智能电子设备的模拟或数字信号，例如。 在控制室或变电站控制器。