| 摘要 |
<p>PURPOSE:To correctly monitor a gas leakage through automatic measurement by providing a gas pressure sensor, an outside air temperature sensor, a density operating means for computing the rate of change of gas pressure to gas temperature and the gas pressure at 0 deg.C, a natural leakage-monitoring means, a gas pressure reference value-computing means and an emergency leakage-monitoring means. CONSTITUTION:Each gas section of a GIS(gas-insulated switchgear) 2 is provided with pressure sensors 1a, 1b,...1n and with an outside air temperature sensor 3 and also with a microcomputer-monitoring part 4, an input amplifier 5, a multiplexer 6, an A/D converter 7 and a data memory part 8, and a means for periodically computing gas density data is formed by a first operating part 9. the natural leakage monitoring means 11 stores and holds a gas pressure and an emergency leakage determination part 12 performs computing a gas pressure to be used as a criterion for determination per unit time and also comparing and determining a detected pressure and the gas pressure.</p> |
