| 摘要 |
<p>PURPOSE:To catch a deterioration of the equipment as soon as possible for preventing an occurance of an accident by fixing a closed switchboard on the installation face through soundwave-absorbing vibration preventing tools for raising a detection sensitivity of an AE sensor for a partial discharge. CONSTITUTION:A closed switchboard box 1 is fixed by bolts on the floor face 13 with the plural number of vibration preventing rubbers inserted between the box 1 and the floor face 13. When the plural number of switchboard boxes are placed in a line, they are connected by blots with a sound absorbing material inserted between adjoining boxes. For example, a soundwave caused by a partial discharge which occurs in the upper part of a breaker 2 is propagated to the box 1 and an installation base 8B through insulating gas in a breaker chamber 1d, the breaker 2 and breaker supporting insulators, to be transmitted to an AE sensor. Consequently, a soundwave which is transmitted as a noise to the AE sensor when a mechanical force is applied to the box 1 from outside is cut off. Furthermore, the increase of an S/N makes a correct detection of a deterioration condition of the equipment possible.</p> |
