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Vacuum Circuit Breakers Testing Methods - Switchgear Content· You can see one of high voltage Vacuum Interrupter Tester as below pic from 10 to 60 kV DC from Megger company: DC Vacuum Interrupter Tester. The leak-rate test (MAC test):This test is based on the Penning Discharge Principle which is named after Frans Michael Penning (1894-1953). Penning showed that when a high voltage is applied to open ...

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