Patent ID: 7142410
Filing Date: 2006-11-28
Classification: H01F,H01H

Abstract:
1. A transformer comprising: a housing having a main transformer compartment, a first compartment, a second compartment and a third compartment, where each of the compartments is maintained separately from each of the others; each of the first, second and third compartments having a separate manually openable cover which can be opened to provide access to an interior of the respective compartment; input terminals mounted in the interior of the first compartment of the housing and covered by the cover thereof for receiving an input voltage from a supply; output terminals mounted in the interior of the second compartment of the housing and covered by the cover thereof for providing an output voltage to a load; a transformer assembly mounted in the main transformer compartment of the housing for converting the input voltage to the output voltage; a switch assembly mounted in the interior of the third compartment and covered by the cover thereof for switching off and on supply of power from the input terminals to the transformer assembly to switch off and on supply of voltage to the output terminals; the main transformer compartment including an insulating liquid bath for the transformer assembly; the switch assembly including switch contacts mounted within a switch container located within the third compartment and a manually operable member for moving the switch contacts between open and closed positions located within the third compartment outside the switch container; the switch container having a transparent window in a wall thereof through which the contacts can be observed from a location outside the housing through the cover of the third compartment when the cover is opened; the switch container containing an insulating liquid bath for the switch contacts; the switch container being separated from the transformer compartment by at least one bulkhead such that the insulating liquid bath of the switch container is maintained separate from the liquid switch bath of the transformer.