| 摘要 |
1,236,246. Transformers. SMIT NIJMEGEN ELECTROTECHNISCHE FABRIEKEN N.V. 7 Oct., 1968 [10 Oct., 1967], No. 47508/68. Heading H1T. A transformer tap-changer comprises onload diverted switches and off-load selectors in separate insulating compartments 4, 3 of a container within a metal liquid filled tank 2 communicating with the transformer tank 1. Tank 2 is separated into upper and lower parts 7, 10 the part 7 is also liquid filled and may communicate with compartment 3 through an aperture 8. A gas operated relay 14 connected to a pipe 13 leading to an expansion vessel 15 serves to protect compartments 3 and 7 against development of excessive pressures. Protection of compartment 4 is provided by a pressure relay 16 connected through an insulating pipe 17 with a pressure box or bellows 18, and also, by means of a rupturable diaphragm 19. Tappings on the phase winding are connected to contacts 11. The tap changer may be connected to high voltage network through bushing insulator 5 by hollow conductor 6 which communicates with a conservator 12. The transformer may be an auto-transformer. |
