| 摘要 |
A protection circuit (44) is disclosed for protecting an electrical generator in case of failure of a power control device in the excitation circuit. The electrical generator comprises a main machine (10), an exciter (18) for providing excitation to the main machine, and an automatic voltage regulator (26), the automatic voltage regulator comprising a power control device (32) for controlling excitation fed to the exciter and a control circuit (42) for controlling the power control device. The protection circuit (44) comprises means (46) for detecting an output of the control circuit, means (52) for detecting an output of the power control device, means (54) for comparing the output of the control circuit with the output of the power control device, and means (34) for reducing the excitation if the output of the power control device does not correspond to the output of the control circuit.
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