| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an instrument transformer as well as that with a zero- phase current transformer which allow reduction in the number of members and works, shorter work process, simplified fitting work, and improved workability in a distribution panel. SOLUTION: Through parallel rod-like conductors where the current of each phase of three-phase AC electric current flow, two instrument transformers 3 comprising a secondary coil 3b wound around iron cores 3a surrounding the conductor where the first phase current and the third phase current of the three-phase AC electric power flow, respectively, and a zero-phase current transformer 4 comprising a secondary coil 4b wound around iron cores 4a which surround three rod-like conductors while adjoining two instrument transformers 3, are provided. Here, the two instrument transformers 3, zero-phase current transformer 4, and three rod-like conductors are molded as one body except for each end part of the conductors.</p> |
