发明名称 |
CURRENT MEASUREMENT METHODS AND APPARATUS EMPLOYING SECOND HARMONIC SCALING |
摘要 |
A method for measuring an AC current in a conductor (10) in which a DC current also exists including the step of obtaining a first AC current measurement, obtaining a measure of a power factor, fundamental frequency component and second harmonic component (S2) and adjusting the first AC current measurement in accordance with an error value to obtain a corrected current measurement (S3, S4). The error value is determined as a function of the power factor, fundamental frequency component and second harmonic component.
|
申请公布号 |
WO9811447(A1) |
申请公布日期 |
1998.03.19 |
申请号 |
WO1997US15081 |
申请日期 |
1997.08.27 |
申请人 |
ABB POWER T & D COMPANY INC. |
发明人 |
SHUEY, KENNETH, C.;HEMMINGER, RODNEY, C. |
分类号 |
G01R19/25;G01R21/133;(IPC1-7):G01R21/06;G01F15/20 |
主分类号 |
G01R19/25 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|