| 摘要 |
An electronic reactive power meter comprises a delay time setting circuit connected to one of a voltage transformer and a current transformer connected to power lines for providing a necessary delay time and a delay circuit for which a delay time is set by the delay time setting circuit, the delay circuit delaying a pulse width duty cycle signal corresponding to a voltage applied from the voltage transformer. The pulse width duty cycle signal is formed by a pulse width modulation circuit connected to the voltage transformer.
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