Hermetically sealed electrical apparatus

Details Hermetically sealed electrical apparatus Hermetically sealed electrical apparatus

2011-03-08

2011-03-08

Mai, Anh T (Department: 2832)

Inductor devices

With temperature modifier

Liquid insulating medium

C336S057000, C174S0120BH, C174S0140BH

Reexamination Certificate

active

07902951

ABSTRACT:
An electric apparatus, preferably a transformer, is hermetically sealed and filled with a dielectric liquid. Devices for recording heat-related volume variations of the dielectric liquid are contained in the apparatus. Volume variations are compensated with the aid of a gas cushion, which is thermally uncoupled from the dielectric liquid. The largest part of the gas cushion is arranged in a container separated from the dielectric liquid expansion tank. All the components of volume compensating devices are constructed in such a way that the operation of used monitoring devices, in particular, also the protection against Buchholz relays waves is maintained. The invention makes it possible to hermetically seal the transformer, thereby substantially reducing the aging of the dielectric liquid and the cellulose-based insulating material of the apparatus. Furthermore, the inventive device makes it possible to avoid the use of air-dehumidifiers and respective conduits.

REFERENCES:
patent: 3335380 (1967-08-01), Gramlich et al.
patent: 5900538 (1999-05-01), Bastian
patent: 5976226 (1999-11-01), Bastian et al.

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