| 摘要 |
<p>PURPOSE: To lessen a space required for the connection of a current transformer with a zero-phase current transformer in a switch control device or the like. CONSTITUTION: A zero-phase current transformer 2 where three-phase primary conductors 32U, 32V, and 32W are made to penetrate through the center window of a toroidal iron core 21 wound with a secondary winding wire and current transformers 1U and 1W where the primary conductors, for instance, 32U and 32W are made to penetrate through the center windows of the toroidal iron cores wound with secondary winding wires respectively are sealed up into one piece by insulating resin 33.</p> |
