| 摘要 |
<p>PURPOSE: To miniaturize an instrument transformer which is provided with an auxiliary device for constitution of a secondary-short-circuit-malfunction preventive circuit. CONSTITUTION: An auxiliary transformer and an auxiliary resistor are housed inside a case 19, and an auxiliary device 18 is housed inside a container 1 in which an insulating medium is sealed together with a transformer body 2. A secondary-terminal box 6 is attached to the side face of the container 1, and secondary-derivation terminals 8 to 11 are attached, via a terminal plate 5, to a terminal stand 104 which is situated inside the secondary-terminal box 6 and which is installed at the side face of the container 1. A primary winding and a secondary winding for the auxiliary transformer are connected respectively in series with a secondary main coil and a secondary subcoil for the transformer body 2. Secondary terminals um, vm and ua, va are derived into the secondary-terminal box 6 via the secondary-derivation terminals 8 to 11 from both ends of a series circuit by the secondary main coil and the secondary subcoil as well as by the primary winding and the secondary winding for the auxiliary transformer.</p> |
