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© CIGRÉ B3-213 Session 2004· PDF fileso-called natural leakage from equipment. Leakage of SF 6 from gas-insulated equipment usually happens at its sealing points and a minute leakage does not affect the operation. In Japan, permissible leakage of SF 6 by the standard is not more than 1% per year. As a result of measurements at 300 points on 40 units of dead dank type GCB under the

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