Protection system for protecting a poly-phase distribution...

Details Protection system for protecting a poly-phase distribution... Protection system for protecting a poly-phase distribution...

2005-01-04

2005-01-04

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

C361S035000

Reexamination Certificate

active

06839207

ABSTRACT:
The distribution transformer is installed in a station having N phases, at least N-1 phases being equipped on the high-voltage side of the transformer with respective current-limiting fuses capable of blowing in the event of a dead short circuit between the phases. The protection system includes: at least one fault detector for detecting faults on the basis of at least one of the following indicators: pressure in the tank, level of the dielectric, or temperature of the transformer; a short-circuiter acting on all the phases situated upstream from the high-voltage windings, said short-circuiter being capable of being triggered by said fault detector to establish a dead short circuit between the phases; and on at least N-1 phases, a detector for detecting an abnormal current upstream from the transformer, said detector being associated with a controller for controlling said short-circuiter. In the system, at least the phase that is not equipped with a limiting fuse is equipped with a disconnector switch which is normally closed in the absence of any fault, said disconnector switch being disposed on the high-voltage side of the transformer upstream from the short-circuiter, and opening thereof being triggered by the short-circuiter in the event of a fault, but with a certain delay.

REFERENCES:
patent: 1989485 (1935-01-01), Marti
patent: 2351969 (1944-06-01), Hurst
patent: 4223364 (1980-09-01), Sangster
patent: 5898556 (1999-04-01), de Sedouy et al.
patent: 6479780 (2002-11-01), Virtanen et al.
patent: 1 102 379 (2001-05-01), None

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