| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent contamination of entrained air in an insulating oil, when gathering the insulating oil. SOLUTION: A check valve type drain oil port 14 comprising a check valve 17 for the drain oil and a presser flange 18 is formed on a lower part of an apparatus vessel 13 of an oil-filled electrical apparatus, and a check valve type oil-gathering port 26 comprising an insertion part 29 and an oil-gathering check valve 28 is formed on an oil-gathering vessel 15 for gathering and preserving the insulating oil.</p> |
