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公开(公告)号：US20030025509A1
公开(公告)日：2003-02-06
申请号：US09921173
申请日：2001-08-02
Applicant: ABB Inc.
Inventor： Kenneth C. Shuey
IPC: G01R031/06
CPC classification number: G01R22/066
Abstract: A method for determining the DC current flowing through an AC power meter. The internal impedance of the distribution transformer is first sensed, then the DC voltage in the AC voltage waveform is measured and finally the measured DC voltage is converted to DC current.
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