| 摘要 |
<p>PURPOSE:To allow a detector to detect the failure accurately including prevention of false detection against the failure in transient fluctuation by adding a moving lock condition by the time differential value of DC output current in a rectifier. CONSTITUTION:The output signal Sf1 of a rotating rectifier 2 is detected by a DC shunt 4, transmitted through a telemeter circuit 5 together with the sum signal Sr1 of the secondary pulsatory output of pulse current transformers 22a to 22f and received as Sf2 and Sr2 respectively. The sum signal Sr2 is compared with a reference signal Sr0, and when it becomes larger than the reference signal Sr0, a failure signal is outputted from a comparator CP1. On the other hand, the current signal Sf2 is compared with the reference value Sf0, and when it exceeds the reference value Sf0, an AND gate is closed by the output of a comparator CP2 through a NOT circuit and the failure signal is blocked. The malfunction caused by imbalance in transient fluctuation can thereby be prevented.</p> |
