Protection system for a three-phase distribution transformer ins

Details Protection system for a three-phase distribution transformer ins Protection system for a three-phase distribution transformer ins

1997-04-03

1999-04-27

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 38, 361 35, 361 93, H02H 504

Patent

active

058985565

ABSTRACT:
A protection system for a three-phase distribution transformer immersed in a liquid dielectric contained in a tank, at least two of the three phases being equipped on the high voltage side of the transformer with respective current-limiting fuses. On each of the two phases equipped with current-limiting fuses, a protective micro-fuse is also connected in series with the current-limiting fuses and which operates faster than the current-limiting fuse. In addition, each micro-fuse is associated with a striker which, in turn, is connected to a mechanical trigger system which causes a three-phase short-circuiting device connected across the three phases to close in the event of a micro-fuse operating. Furthermore, the system includes at least one fault detector detecting one of pressure in the tank or the level of the dielectric. In particular, the three-phase short-circuiting device is situated on the high voltage side of the transformer between the current-limiting fuses and the high voltage windings.

REFERENCES:
patent: 2817794 (1957-09-01), Amundson
patent: 3445726 (1969-05-01), Allen
patent: 3666992 (1972-05-01), Goodman
patent: 3916259 (1975-10-01), Russell et al.
patent: 4002949 (1977-01-01), Westrom
patent: 4223364 (1980-09-01), Sangster

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