Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Patent
1977-09-09
1978-09-26
Kozma, Thomas J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
165DIG14, 165105, 174 11R, 174 15R, 336 57, 361 41, H02H 704
Patent
active
041175255
ABSTRACT:
Overpressure protection for a vaporization cooled electrical inductive apparatus. A pressure responsive device is actuated by a predetermined pressure within a sealed housing and de-energizes a pump, thereby stopping the flow of dielectric fluid to the heat producing members which prevents further pressure increases within a tank due to continued vaporization of the dielectric fluid. In one embodiment, a discharge valve is actuated by the pressure responsive device to drain the dielectric fluid from the windings to prevent further pressure increases caused by continued vaporization of the dielectric fluid. A fusible link is provided to disconnect the windings of the electrical inductive apparatus from a source of electrical potential subsequent to the de-energization of the pump. In another embodiment, the pressure responsive device actuates the circuit breaker which disconnects the windings of the electrical inductive apparatus from the source of electrical potential.
REFERENCES:
patent: 2640101 (1953-05-01), Hughes
patent: 2904616 (1959-09-01), Koepke et al.
Electric Power Research Institute Inc.
Hanlon, Jr. William M.
Kozma Thomas J.
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