| 摘要 |
<p>PURPOSE:To reduce the number of parts and to improve the reliability of a circuit operation by a method wherein the secondary side output of each current transformer installed at two phases of a three phase bus is supplied to a load through one rectifier. CONSTITUTION:The secondary side output of current transformers 2, 2 installed at two optional phases of a three phase bus 1 are connected in parallel to AC input terminals of a all wave rectifier 4 and further, an impedance element 3 is connected between these input terminals and a DC outpt of the rectifier is supplied to a load 5 of a control relay 5, etc. At this time, it is designed that the element 3 has an impedance equal to or less than a rated value of one unit share of a current transformer 2, and with this, a parallel connection can be performed safely.</p> |
