Electronic load for testing transformers

Details Electronic load for testing transformers Electronic load for testing transformers

1987-04-06

1989-08-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

323357, G01R 3100

Patent

active

048578274

ABSTRACT:
An adjustable electronic load for testing current transformers and/or voltage transformers, the load having connected, between its input current terminals, a series connection including the input of a current-to-voltage converter and the output of a controlled generator, and having connected, between its input voltage terminals, the input of a voltage-to-voltage converter. The outputs of the current-to-voltage converter and the voltage-to-voltage converter are each connected via an impedance to a control input of the controlled generator. The voltage-to-voltage converter and the current-to-voltage converter each comprise at least one amplifier with adjustable amplification. The amplifications of the two adjustable amplifiers are adjustable jointly in opposite directions. In the case of a load for testing a current transformer, with the rated secondary power of the current transformer being predetermined, the amplification of the current-to-voltage converter is reduced or increased and the amplification of the voltage-to-voltage converter is increased or reduced respectively, so as to increase or reduce the rated secondary current, respectively. In the case of a load for testing a voltage transformer, with the rated secondary power of the voltage transformer being predetermined, the amplification of the voltage-to-voltage converter is reduced or increased and the amplification of the current-to-voltage converter is increased or reduced respectively, so as to increase or reduce the rated secondary voltage, respectively.

REFERENCES:
patent: 3497793 (1970-02-01), Gasparini et al.
patent: 3701008 (1972-10-01), Kusters et al.
patent: 4739248 (1988-04-01), Perkins
Bradley et al, Transient Compensation of Current Transformers, Jul./Aug. 1978, IEEE Trans. on Power Apparatus and Systems, vol. PAS-97, No. 4.
IEC Standard (International Electrotechnical Commission), Publ. #185; 1st Edition, 1966; Bureau Central de la Commission Electrotechnique Internationale.
American National Standard (ANS), Dec. 29, 1978; ANSI/IEEE; C57.13-1978.

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