Condition responsive transformer primary switch

Details Condition responsive transformer primary switch Condition responsive transformer primary switch

H - Electricity

02

H

317/7

H02H 7/04 (2006.01) H01H 37/60 (2006.01) H02H 5/06 (2006.01)

Patent

CA 1072174

TEMPERATURE SENSING TRANSFORMER PRIMARY SWITCH Abstract A temperature sensing transformer primary switch for a distribution transformer, the switch being mounted within the distribution transformer below the level of the dielectric fluid and being manually operable externally of the transformer for opening the primary circuit and deenergizing the transformer, the switch including a temperature sensing device mounted on the internal end of the transformer below the level of the dielectric fluid to open the primary switch in response to overload temperatures produced on the transformer's secondary circuit. The temperature sensing device includes a compression spring and a wax motor for releasing the energy stored in the compression spring as the temperature of the dielectric fluid reaches a predetermined maximum temperature. The spring is preloaded sufficiently by a manual operation to actuate the switch at the maximum temperature. A pressure responsive switch assembly is provided for opening the primary switch.

243433

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