| 摘要 |
PROBLEM TO BE SOLVED: To perform gas leakage monitoring along with high-pressure monitoring while calculation for high-pressure monitoring is simplified, allowing sufficient time. SOLUTION: A control part 24 calculates collection pressure based on a temperature data corresponding to detected temperature of SF6 gas, a pressure data corresponding to detected pressure of SF6 gas, a first constant density straight line which is a constant density straight line at a first pressure higher than the detected pressure, a second constant density straight line which is a constant density straight line at a second pressure lower than the detected pressure, and a third constant density straight line which is a pressure close to a reference seal-in pressure of SF6 gas, so that processed data amount and calculation amount are reduced for sufficient process time, and a counter measure against abnormal high pressure or low pressure of SF6 gas pressure is taken without damaging a pressure vessel (GIS, etc). Since the constant density straight line data is only for quantity or three, labor for data collection is omitted in spite of correction pressure obtained over a wide pressure range, resulting in easier system construction. |
