Electricity: measuring and testing – Testing and calibrating electric meters
Patent
1996-03-26
1999-01-19
Nguyen, Vinh P.
Electricity: measuring and testing
Testing and calibrating electric meters
G01R 2106
Patent
active
058617400
ABSTRACT:
In a load loss standard for calibrating a power measurement system, a pair of reference voltage signals are generated, one in-phase and the other in quadrature with a test voltage ac source. A transconducting and summing amplifier generates an output current corresponding to the vector sum of these reference signals. By varying the magnitude of each of the reference signals independently of each other it becomes possible to vary the phase of the output current relative to the source, while keeping the magnitude of such current constant.
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patent: 5453697 (1995-09-01), Schweer et al.
"An Improved Current-Comparator-Based 1000-A Transconductance Amplifier for the In-Situ Calibration of Transformer Loss Measuring Systems", P.N. Miljanic et al., IEEE Trans. Power Delivery, vol. 8, pp. 861-865, Jul. 1993.
"The Application of the Current Comparator in Instrumentation for High Voltage Power Measurements at Very Low Power Factors", Eddy So, IEEE Transactions on Power Deliver, vol. PWR D-1, pp. 98-104, Jan. 1986.
National Research Council of Canada
Nguyen Vinh P.
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