公开(公告)号：US09170284B2

公开(公告)日：2015-10-27

申请号：US14612644

申请日：2015-02-03

Applicant: FUJITSU LIMITED

Inventor： Hirotaka Oshima ,  Akio Ito

IPC: G01R21/00 ,  G01R21/133 ,  G01R1/07 ,  G01R19/00 ,  G01R25/00

CPC classification number: G01R21/006 ,  G01R1/07 ,  G01R19/0084 ,  G01R21/133 ,  G01R25/00

Abstract: An A.C. power measuring apparatus includes a voltage detecting unit that detects voltage waveforms of each of phases of a set of insulated cables for supplying a three-phase A.C. power to a load, by performing a contactless measurement by electrostatic capacitance coupling, and a current detecting unit that detects current waveforms of the set of insulated tables, by performing a contactless measurement by electromagnetic induction coupling. The apparatus further includes a processing unit that computes a power to be supplied to the load, based on line-to-line voltage waveforms, the current waveforms, and prescribed voltage values, by normalizing the voltage waveforms of each of the phases so that as amplitude ratio of the voltage waveforms becomes in accordance with a grounding type of the three-phase A.C. power, and obtaining the line-to-line voltages of the set of three insulated cables based on the normalized voltage waveforms of each of the phases.

Abstract translation: 交流电力测量装置包括：电压检测单元，其通过静电电容耦合进行非接触式测量，检测通过静电电容耦合的非接触式测量，检测用于向负载提供三相交流电力的一组绝缘电缆的各相的电压波形; 通过电磁感应耦合进行非接触式测量来检测该组绝缘台的电流波形的单元。 该装置还包括处理单元，其通过对各相的电压波形进行标准化，基于线间电压波形，电流波形和规定的电压值来计算要提供给负载的功率，使得 电压波形的振幅比根据三相AC电力的接地类型，并且基于各相的归一化电压波形获得三组绝缘电缆的线间电压。