| 摘要 |
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.
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