Transformer protection system for protecting source transformers

Details Transformer protection system for protecting source transformers Transformer protection system for protecting source transformers

1996-10-04

1998-08-04

Young, Brian K.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 93, 361115, H02H 300

Patent

active

057903565

ABSTRACT:
A conversion of a three-phase, four-wire power system to divert all zero-sequence current from the power system grounded-neutral source transformer and its phase and neutral conductors. A zero-sequence filter transformer such as a zig-zag transformer is installed, and the system neutral conductor and ground point are relocated from the neutral terminal of the source transformer to that of the zero-sequence filter transformer. A protection scheme operates to trip a main circuit breaker for zero-sequence filter transformer overloads or short circuits. The source transformer and its neutral circuit are thereby protected from the ill effects of zero-sequence currents.

REFERENCES:
patent: 3678338 (1972-07-01), Beachley

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