Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1978-10-13
1980-09-02
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337204, 337249, H01H 8514, H01H 8502
Patent
active
042209412
ABSTRACT:
A high voltage oil expulsion fuse having multiple fuse wire bores which vent into opposed chambers which communicate with the oil medium for convective flow of oil through the bores during normal operation is provided wherein a pressure sensitive valve associated with one of the chambers allows only unidirectional venting of deionizing gases from the fuse when a fault or overload occurs causing sequential melting of the fusible elements in respective bores. Oil derived gases generated by the last to melt fusible element vent in both directions from the corresponding bore and the pressure thereof causes the valve to close forcing such gases to flow through the remaining bores to assure complete evacuation of conductive material from all bores upon fuse operation. In this manner, interruption against a high rate of rise of recovery voltage is assured and delayed failure of the fuse under normal frequency recovery voltage is also prevented. Only a partial segment of each fuse wire is fusible while the remainder is configured to enhance complete evacuation of conductive material from the bores by oil-derived arc generated gases upon operation of the fuse. The fuse wire bores are formed in a cylindrical dielectric core which in turn is contained within a tubular casing that supports the terminals of the fuse in spaced relation. Strategically positioned seals are provided to preclude gas leakage from the bores into the interface between the core and the casing such that dielectric breakdown in this area is prevented.
REFERENCES:
patent: 2156058 (1939-04-01), Lohausen
patent: 2291341 (1942-07-01), Lincks
patent: 4041434 (1977-08-01), Jacobs et al.
Mahieu William R.
Popeck Charles A.
A. B. Chance Company
Broome Harold
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