SOURCE-FREE CALIBRATION METHOD FOR SMART METER

WIPO Patent Application WO/2022/247088

A1

A source-free calibration method for a smart meter, comprising: generating voltage by a stabilized voltage supply and inputting the voltage to a load having a specified power factor; separately using a standard commercial electricity meter and an electricity meter to be calibrated to measure electricity data of the load; and calculating an error between the electricity meter to be calibrated and the standard commercial electricity meter according to the electricity data as a gain value. Calibrating a metering chip of the electricity meter comprises: parameter setting, comprising mode configuration, channel gain configuration, EMU unit configuration, high frequency pulse output configuration, voltage loss threshold setting, and start threshold setting; A phase correction, comprising power gain correction, voltage correction, and current correction; and B phase correction and C phase correction. Compared with conventional calibration, the source-free calibration method has lower costs, and the current, voltage, and power can meet the requirements of level-2 electricity meters.

WANG YIHUAI (CN)
SHI HONGWEI (CN)
SHI LIANMIN (CN)
YU BINGZHENG (CN)

PCT/CN2021/121549

December 01, 2022

September 29, 2021

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UNIV SOOCHOW (CN)

G01R35/04

CN113176531A	2021-07-27
CN104297717A	2015-01-21
CN102520385A	2012-06-27
CN109557496A	2019-04-02
CN105242233A	2016-01-13
EP0569740A1	1993-11-18

SUZHOU JIANSHAN INTELLECTUAL PROPERTY AGENCY (SPECIAL GENERAL PARTNERSHIP) (CN)

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