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US 2011/0255199 A1Published application
Arc flash hazard reduction for transformer secondaries
AssigneeGeneral Electric Company
InventorPeter Edward Sutherland
Life of this patent
Estimating the term…
Abstract
Arc flash hazard reduction for transformer secondaries is provided. A current-limiting protection device such as a current-limiting fuse is located between the secondary windings of a transformer and switchgear having a main circuit breaker. Placing the current-limiting fuse between the secondary windings of the transformer and switchgear reduces arc flash hazard levels between the transformer and the switchgear.
Claims20
A system, comprising:
- a transformer having at least one primary winding and at least one secondary winding;
- switchgear having a main circuit breaker coupled to the transformer via the at least one secondary winding;
- and
- at least one current-limiting protection device located between the transformer and the switchgear, wherein the at least one current-limiting protection device couples to the at least one secondary winding of the transformer, the at least one current-limiting protection device reducing arc flash hazard levels between the at least one secondary winding of the transformer and the switchgear, wherein the arc flash hazard levels between the at least one secondary winding of the transformer and the switchgear have incident energy levels that are greater than about 40 cal/cm2.
1 more element
An arc flash hazard reduction system, comprising:
- a transformer having at least one primary winding and at least one secondary winding;
- switchgear having a main circuit breaker coupled to the transformer via the at least one secondary winding;
- and
- at least one current-limiting fuse located between the transformer and the switchgear, wherein the at least one current-limiting fuse couples to the at least one secondary winding of the transformer, the at least one current-limiting fuse reducing arc flash hazard levels between the at least one secondary winding of the transformer and the switchgear, wherein the arc flash hazard levels between the at least one secondary winding of the transformer and the switchgear have incident energy levels that are greater than about 40 cal/cm2.
1 more element
(canceled)
A power sub-station, comprising:
- a primary switch receiving an incoming voltage supply;
- a transformer having at least one primary winding and at least one secondary winding, wherein the at least one primary winding of the transformer couples to the primary switch;
- switchgear having a main circuit breaker coupled to the transformer via the at least one secondary winding;
- and
- at least one current-limiting fuse located between the transformer and the switchgear, wherein the at least one current-limiting fuse couples to the at least one secondary winding of the transformer, the at least one current-limiting fuse reducing arc flash hazard levels between the at least one secondary winding of the transformer and the switchgear, wherein the arc flash hazard levels between the at least one secondary winding of the transformer and the switchgear have incident energy levels that are greater than about 40 cal/cm2.
2 more elements
Dependencies are inferred from the claim text.