Title: Method for checking and calibrating three phase electric power instrument
Application Number: 97106595 Application Date: 1997.09.05
Publication Number: 1177128 Publication Date: 1998.03.25
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01R21/00,G05F1/66
Applicant(s) Name: Baogang Metallurgical Construction Corp., Shanghai Address: 200941
Inventor(s) Name:
Attorney & Agent: CHEN XIAOMEI
Abstract:
     The present invention disclosed a kind of method for checking and ealibrating three phase watt meter, i. e. the so called simgle phase method. It utilizes single phase power source and a set of standard equipment, according to the relation formula of input current I' phi of single phase method and the input phase current I phi of two watt meter method I'phi= (the square root of 3)/2 X I phi then the safe and accurate checking and calibration for three phase watt meter canbeimplemented the powder value P of the watt meter to be checked while inputting by single phase method wiring is made to equal the power value Po of the same watt meter while inputting by two watt meter method wiring.
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