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MAINTENANCE OF POWER CIRCUIT BREAKERS· PDF fileMaintenance of SF6 gas circuit breakers ..... 10 6.1. Properties of SF 6 (sulfur hexafluoride) gas ..... 10 6.2. Handling nonfaulted SF 6 ... and filter or replace the oil if the dielectric strength is less than 22 kV. The oil should be filtered or replaced

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