| 摘要 |
<p>PURPOSE:To make stable measurement of voltage or current by controlling heat generated in an instrument transformer by the use of a transformer housing made of a material with good thermal conductivity and cooled with cooling medium. CONSTITUTION:An housing 20 is provided with an opening 21 for the accommodation of CT1 and, when accommodated, it is closely surrounded by material with good thermal conductivity such as a copper plate. The housing 20 has a perforation hole 22 at the same position as a perforation hole 2 of the CT1, and on the surfaces of the housing a copper pipe 23, etc., is fixed by brazing, etc., through which cooling medium such as water and oil is flowed. The CT1 is accommodated in the housing 20, a cover 25 is fitted on the opening 21 and is fixed by means of bolts and nuts through holes 24, 27. The temperature of the CT1 does not rise even if a high-frequency current is made to flow through its leads 7, 8. The size of the housing 20 can be reduced by forming it with a single-hole plate and fixing the conduit 23 to it.</p> |
