Method and kit for upgrading a generator to enhance operation of the generator

Patent metadata

Field	Value
Publication number	US-9680343-B2
Application number	US-201113103893-A
Country	US
Kind code	B2
Filing date	May 9, 2011
Priority date	May 9, 2011
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

In certain exemplary embodiments, a generator field upgrade kit includes a design modification package configured to be installed in a generator field of a generator as a retrofit to mitigate damage of the generator field due to high cyclic duty of the generator. The design modification package includes a plurality of individual modifications that are selectable based on specific operational and performance parameters of the generator.

First claim

The invention claimed is:

1. A generator field kit, comprising:
a design modification package configured to be installed in a generator field of a generator as a retrofit, wherein the design modification package comprises a plurality of individual modification features that are selectable based on specific operational and performance parameters of the generator, the plurality of individual modification features comprises an enhanced cooling mechanism as a replacement or supplement to an original cooling mechanism of the generator field, the enhanced cooling mechanism comprises a coil having a groove formed through the coil, and the groove extends axially from a middle portion of the coil to an endwinding portion of the coil to facilitate heated air escaping through the groove, and wherein the plurality of individual modification features comprises two or more mechanically hardened turns of field windings of the generator field, and the two or more mechanically hardened turns are hardened without annealing.

2. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises field windings of the generator field that are made of copper coils having high silver content.

3. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises at least two turns of an endwinding of field windings of the generator field that are mechanically bonded to each other.

4. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises a spring-loaded block configured to be inserted between an end coil and a centering ring of the generator field.

5. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises a polytetrafluoroethylene coated creepage block of the generator field.

6. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises a machine relief in either a coil or a rotor slot of the generator field.

7. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises at least two turns of an endwinding of field windings of the generator field that are mechanically bonded to each other, and a spring-loaded block configured to be inserted between an end coil and a centering ring of the generator field.

8. The generator field upgrade kit of claim 1 , wherein the two or more mechanically hardened turns have a Rockwell C hardness greater than or equal to 60.

9. The generator field upgrade kit of claim 1 , wherein the two or more mechanically hardened turns comprise cold worked copper.

10. The generator field upgrade kit of claim 1 , wherein the plurality of individual modification features comprises:
field windings of the generator field that are made of copper coils having high silver content;
at least two turns of an endwinding of field windings of the generator field that are mechanically bonded to each other;
a spring-loaded block configured to be inserted between an end coil and a centering ring of the generator field;
a polytetrafluoroethylene coated creepage block of the generator field; and
a machine relief in either a coil or a rotor slot of the generator field.

11. A method, comprising:
providing a design modification package for retrofitting an existing generator field of a generator, wherein the design modification package comprises a plurality of individual modification features that are selectable based on specific operational and performance parameters of the generator, the plurality of individual modification features comprises an enhanced cooling mechanism as a replacement or supplement to an original cooling mechanism of the generator field, the enhanced cooling mechanism comprises a coil having a groove formed through the coil, and the groove extends axially from a middle portion of the coil to an endwinding portion of the coil to facilitate heated air escaping through the groove, and wherein the plurality of individual modification features comprises two or more mechanically hardened turns of field windings of the generator field, and the two or more mechanically hardened turns are hardened without annealing; and
selecting one or more of the individual modification features of the design modification package based on the specific operational and performance parameters of the generator.

12. The method of claim 11 , comprising replacing field windings of the generator field with copper coils having high silver content as an individual modification feature.

13. The method of claim 11 , wherein the two or more mechanically hardened have a Rockwell C hardness greater than or equal to 60.

14. The method of claim 11 , wherein comprising mechanically bonding at least two turns of an endwinding of generator field windings of the generator field to each other as an individual modification feature.

15. The method of claim 11 , wherein comprising installing a spring-loaded block between an end coil and a centering ring of the generator field as an individual modification feature.

16. The method of claim 11 , wherein comprising coating a creepage block of the generator field with polytetrafluoroethylene as an individual modification feature.

17. The method of claim 11 , wherein comprising machining a relief in either a coil or a rotor slot of the generator field as an individual modification feature.

Assignees

• Draina Kevin Mitchell
• Mancuso Benjamin Alber
• Vanslyke Donald Alden
• Gen Electric

Inventors

• Draina Kevin Mitchell
• Mancuso Benjamin Alber
• Vanslyke Donald Alden

Classifications

• H02K3/24 Primary

  with channels or ducts for cooling medium between the conductors · CPC title

• H02K3/02

  Windings characterised by the conductor material · CPC title

• Y10T29/49009

  Dynamoelectric machine · CPC title

• H02K3/51

  applicable to rotors only · CPC title

• Y02E20/16

  Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] · CPC title