Bus isolation system

• US 6,133,533 A
• Filed: 12/09/1998
• Issued: 10/17/2000
• Est. Priority Date: 12/09/1998
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Stevenson, Andrew C., Kauffman, Eric J., Pate, Paul S.
• Primary Examiner(s): Kincaid, Kristine
• Assistant Examiner(s): WALKENHORST, DAVID W
• Application Number:
  US09/208,068
• Time in Patent Office: 678 Days
• Field of Search: 174/99 B, 174/71 B, 174/72 B, 174/99 R, 174/40 CR, 174/49 B, 174/154, 174/167
• US Class Current: 174/99.00B
• CPC Class Codes: H02G 5/025 Supporting structures

Abstract

An electrical bus isolation system includes a pair of bus bar supporting members, each of which includes a first substantially flat surface portion configured to retain a first bus bar, and second and third substantially flat surface portions each disposed on opposite sides of the first surface portion, and defining an offset in height from the first surface portion. The second and third surface portions are configured to retain opposite lateral sides of a second bus bar when the pair of supporting members are operatively engaged, with corresponding second and third surface portions facing each other such that the first bus bar is retained in a fixed position relative to the second bus bar in a parallel spaced relationship thereto and at a distance determined by the offset in height. An air gap between the bus bars electrically isolates the bus bars and prevents corona discharge between the bus bars.

Claims

1. An electrical bus isolation system for isolating and retaining a plurality of bus bars in a parallel, spaced relation to each other, the system comprising:

first and second bus bar supporting members, each including

a first substantially flat surface portion configured to retain a first bus bar;

second and third substantially flat surface portions each disposed on opposite sides of the first surface portion, and defining an offset in height from the first surface portion;

the second and third surface portions configured to retain opposite lateral sides of a second bus bar when the supporting members are operatively engaged with corresponding second and third surface portions facing each other, such that the first bus bar is retained in a fixed position relative to the second bus bar in a parallel spaced relationship thereto and at a distance determined by the offset in height, wherein at least one of the bus bars is secured to at least one of the first, second, and third surface portions of the supporting members by a fastener that extends through a fastener gripping portion of the supporting members for a first predetermined depth, and extends through a second adjacent fastener isolating portion of the supporting members for a second predetermined depth, said fastener isolating portion having a greater diameter than the gripping portion so as to define a chamber about the fastener, the chamber configured to increase the electrical isolation between the bus bar and the supporting members.

2. The system according to claim 1 wherein the first and second bus bars are fixed in place by the supporting members and are separated from each other by an air gap such that corona discharge between the bus bars is eliminated.

3. The system according to claim 1 wherein the supporting members are E-shaped members such that the first portion is lower in height than the second and third portions.

4. The system according to claim 3 wherein the first and second E-shaped members are secured together and configured to retain and isolate a positive, a negative, and a neutral bus bar, such that the positive bus bar is affixed to the first surface portion of the first E-shaped member, the negative bus bar is affixed the first surface portion of the second E-shaped member, and the neutral bus bar is secured between corresponding second and third surface portions of the E-shaped members.

5. The system according to claim 4 wherein the positive and negative bus bars are affixed to the first surface portion of the E-shaped members by a fastener that is substantially flush with a surface of the corresponding bus bar such that the positive and negative bus bars are fixedly retained in a parallel orientation relative to the neutral bus bar at a distance of about 0.25 inches.

6. The system according to claim 4 wherein the positive and negative bus bars are affixed to the first surface portion of the E-shaped members by a fastener that is substantially flush with a surface of the corresponding bus bar such that the positive and negative bus bars are fixedly retained in a parallel orientation relative to the neutral bus bar at a distance of between 0.16 inches and 0.35 inches.

7. The system according to claim 4 wherein the positive and negative bus bars are each separated from the neutral bus bar by an air gap such that corona discharge between the bus bars is eliminated.

8. The system according to claim 7 wherein the air gap has no insulating material disposed therewithin and the bus bars are non-insulated, said air gap providing electrical isolation sufficient to prevent corona discharge between the bus bars.

9. The system according to claim 1 wherein the spaced relationship between the first and second bus bars creates an air gap therebetween, said air gap electrically isolating the bus bars from each other sufficient to prevent corona discharge therebetween when a voltage potential of greater than 8,000 volts is applied between the bus bars.

10. An electrical bus isolation system for isolating and retaining a plurality of bus bars in a parallel, spaced relation to each other, the system comprising:

a pair of bus bar supporting members, each including

first means for retaining a first bus bar;

second and third means for retaining a second bus bar, said second and third means for retaining defining an offset in height relative to the first means for retaining; and

the second and third means configured to retain opposite lateral sides of the second bus bar when the pair of supporting members are operatively engaged with corresponding second and third means facing each other, such that the first bus bar is retained in a fixed position relative to the second bus bar in a parallel spaced relationship thereto and at a distance determined by the offset in height, wherein at least one of the bus bars is secured to at least one of the first, second, and third surface means for retaining by a fastener that extends through a fastener gripping portion of the supporting members for a first predetermined depth, and extends through a second adjacent fastener isolating portion of the supporting members for a second predetermined depth, said fastener isolating portion defining a chamber about the fastener configured to increase the electrical isolation between the bus bar and the supporting members.

11. The system according to claim 10 wherein the first and second bus bars are fixed in place by the supporting members and are separated from each other by an air gap such that corona discharge between the bus bars is eliminated.

12. The system according to claim 10 wherein the supporting members are E-shaped members such that the first means for retaining is lower in height than the second and third means for retaining.

13. The system according to claim 12 wherein first and second E-shaped members are secured together and configured to isolate and retain a positive, a negative, and a neutral bus bar, such that the positive bus bar is affixed to first means for retaining corresponding to the first E-shaped member, the negative bus bar is affixed to the first means for retaining corresponding to the second E-shaped member, and the neutral bus bar is secured between corresponding second and third means for retaining of the corresponding E-shaped members.

14. The system according to claim 13 wherein the positive and negative bus bars are affixed to the E-shaped members by fastening means adapted to be substantially flush with a surface of the corresponding bus bar such that the positive and negative bus bars are fixedly retained in a parallel orientation relative to the neutral bus bar at a distance of about 0.25 inches.

15. The system according to claim 13 wherein the positive and negative bus bars are fixedly retained in a parallel orientation relative to the neutral bus bar at a distance of about between 0.16 inches and 0.35 inches.

16. The system according to claim 13 wherein the positive and negative bus bars are each separated from the neutral bus bar by an air gap such that corona discharge between the bus bars is substantially eliminated.

17. The system according to claim 16 wherein the air gap has no insulating material disposed therewithin and the bus bars are non-insulated, said air gap providing electrical isolation sufficient to prevent corona discharge between the bus bars.

18. The system according to claim 10 wherein the spaced relationship between the first and second bus bars creates an air gap therebetween, said air gap electrically isolating the bus bars from each other sufficient to prevent corona discharge therebetween when a voltage potential of about 8,000 volts is applied between the bus bars.