Safety device for medium voltage/low voltage electrical distribution transformer for converting medium voltage into low voltage, has tank comprising feedthroughs, where number of feedthroughs is twice as number of supply phases of appliance

摘要

The device (3) has a hermetic tank (4) made of conducting material and connected to a ground potential. A protection unit (6) and an insulation unit (9) are integrated into the ground potential. The hermetic tank is filled with dielectric liquid or gas (5), and comprises electrical feedthroughs (11), where number of the feedthroughs is twice as number of supply phases of an electrical appliance (2) such that fuses (7) are not accessible and a switching and disconnecting device (10) is not resettable without the need to open the hermetic tank.