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Power frequency testing for 24kV Vacuum Circuit Breaker Phase to phase, phase to earth power frequency withstand voltage; IEC standard required 65kV; Left first meter is the power frequency withstand voltage kV; Second meter is the leakage current A; Third meter is timer; Requires withstand voltage time of 60s not break down, If it fails, the voltage cannot be maintained to 60s, the equipment will trip, and it cannot be re-setting input 65kV voltage. The leakage current is only less than 2A, the
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