Temperature sensing transformer primary switch

Details Temperature sensing transformer primary switch Temperature sensing transformer primary switch

1975-04-16

1977-10-11

Broome, Harold

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

200 83R, 337 2, 337396, H02H 704

Patent

active

040539385

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.

REFERENCES:
patent: 1670697 (1928-05-01), Treanor
patent: 2156461 (1939-05-01), Rittenhouse
patent: 2268229 (1941-12-01), Walle
patent: 2306728 (1942-12-01), Heddaeus
patent: 2714143 (1955-07-01), Whitman et al.
patent: 2750472 (1956-06-01), Strange
patent: 2892591 (1959-06-01), Matthews
patent: 3131269 (1964-04-01), Asakawa
patent: 3169180 (1965-02-01), Chafer

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