End section for connecting a generator takeoff to a block transformer

• US 4,197,571 A
• Filed: 07/20/1978
• Issued: 04/08/1980
• Est. Priority Date: 10/13/1975
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Grunert, Gerhard
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US05/926,379
• Time in Patent Office: 628 Days
• Field of Search: 361/331-335, 361/340, 361/341, 361/378, 174/18, 174/21 JR, 174/21 JC, 174/21 CA, 174/86, 174/99 E
• US Class Current: 361/611
• CPC Class Codes: H02G 5/002 Joints between bus-bars for compensating thermal expansion
• CPC Class Codes: H02G 5/063 filled with oil or gas

Abstract

A single phase, metal encapsulated generator takeoff for generators of large power rating, which permits equalization of position tolerances in the vertical and horizontal direction when making the connection to a block transformer without effort in which each phase of the generator leadoff consists of a rigid inner conductor and a cylindrical, gas-tight tubular envelope which surrounds the inner conductor concentrically and in which the inner conductor is supported by support insulators, and which has ring-like expansion compensators at suitable spacings for taking up length changes caused by temperature variations. The inner conductor is connected to the terminals of the block transformer by expansion strips. The end section of the tubular enclosure of each phase facing the block transformer has two spaced joints, tiltable in all directions, in the form of expansion compensators. The inner conductor is provided with a third joint which permits tilting in all directions at the height of the expansion compensator which is the one of the two farther away from the transformer.

Claims

1. In a metal encapsulated generator take off for generators of a large power rating coupling a single phase of the generator to a block transformer, the generator takeoff including an end section having a rigid inner conductor and a cylindrical gas-tight tubular enclosure which concentrically surrounds the inner conductor and on which the inner conductor is supported by support insulators, said tubular enclosure having spaced ring-like expansion compensators for taking up length changes caused by temperature variation, and in which the inner conductor is connected by means of expansion strips to the block transformer, the improvement comprising:

(a) the expansion compensators for taking up length changes in said tubular enclosure being two spaced joints, one nearer to the transformer and one further away, each in the form of an expansion compensator and tiltable in all directions;

(b) a third joint tiltable about two mutually perpendicular axes, which axes are also perpendicular to the longitudinal axes of the inner conductor, inserted in the inner conductor at the height of the one of said expansion compensators which is farther away from the transformer, said joint secured to said inner conductor in an insulating manner to prevent a flow of current therethrough; and

(c) metallic strips bridging said third joint.

2. Apparatus according to claim 1, wherein said third joint is a ball joint.

3. Apparatus according to claim 1, wherein said third joint is a knuckle joint.

4. Apparatus according to claim 1 and further including metallic strips bridging said third joint.

5. Apparatus according to claim 4, wherein said third joint is fastened to said inner conductor in an insulated manner.

6. Apparatus according to claim 1, wherein said expansion compensators are aluminum compensators.

7. Apparatus according to claim 1, wherein the expansion compensator nearer the transformer is a neoprene compensator.

8. Apparatus according to claim 1, and further including an enclosure support having one of hydraulic means and tension and pressure screws such that it can be tilted in the radial direction supporting the end section of each phase of the generator takeoff.

9. Apparatus according to claim 1 wherein said transformer is a multi-phase transformer, a generator take off according to claim 1 being provided for each phase and wherein the expansion compensators associated with the tubular enclosures of different phases are mutually staggered in the axial direction.