Looking for information about annual SF6 leak rate and how the leak rate was determined. Is the leak detection system sensitive enough to detect a small leak < 0.5%?
The SF6 leakage rate of HECS-100 is very low (less than 0.5% per year), and it is determined for each interrupting chamber during its assembly by means of a gas tightness test. During this test, the interrupter chamber is placed within a fixed air volume, and a gas sampling analyzer system is used to monitor the quantity of SF6 gas within this volume for a certain period of time. The limit of detection of SF6 molecules of such device is 6 ppb (what is the full term for ppb?), which allows to detect leakage rates of <0.5% per year, which applies for the entire life of the circuit-breaker.
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