Plug and socket pure gas insulated wall bushing for HVDC and UHV

Patent metadata

Field	Value
Publication number	US-9515471-B2
Application number	US-201214371068-A
Country	US
Kind code	B2
Filing date	Jan 9, 2012
Priority date	Jan 9, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

The invention relates to the domains of power electronics and electric power transmission systems and concerns a new structure for wall bushings for High and Ultra High Voltage AC or DC applications. The wall bushing is remarkable as it can be assembled as a kit of two replaceable modules: a plug type module ( 20 ) and a socket type module ( 30 ) whose central conductors ( 15 a, 15 b ) are connected by a joint that allows their thermal expansion.

First claim

The invention claimed is:

1. Plug type module ( 20 ) forming one section of a high voltage AC or DC wall bushing made in pure gas technology, said plug type module comprising an insulating tube ( 3 ) that is axially extended at a first end thereof by an internal tubular section of a central flange part ( 2 a ) arranged at a first end ( 21 ) of the plug type module, said insulating tube ( 3 ) and said central flange part ( 2 a ) surrounding a central cylindrical conductor ( 15 a ), said conductor axially extends along the plug type module and has an extremity at said first end ( 21 ) of said plug type module, wherein said central flange part ( 2 a ) of the plug type module comprises at least one support insulator ( 41 , 42 , 43 ) connecting the internal tubular section of the central flange part ( 2 a ) of said plug type module to a sliding bush ( 44 ) that surrounds the central conductor ( 15 a ), said central conductor axially extending outside said plug type module at the first end thereof, wherein the extremity of said central conductor has a diameter decreasing towards its end, the plug type module having at its second end ( 22 ) a flange ( 4 ) that seals it and that supports the central conductor, said plug type module being designed to be electrically plugged on operation site into a socket type module ( 30 ) that forms the other section of a high voltage AC or DC wall bushing made in pure gas technology by reversibly sealing the central flange part ( 2 a ) of said plug type module with a central flange part ( 2 b ) of the socket type module and by removably connecting said extremity of the central conductor ( 15 a ) of said plug type module to a central conductor ( 15 b ) of the socket type module, in this way the plug and socket modules can be transported as separate parts to be assembled on site.

2. Plug type module according to claim 1 , wherein the extremity of the central conductor ( 15 a ) presents a non-uniform decreasing diameter and comprises a conductive portion ( 25 ) and a conductive guiding pin ( 26 ) that has a diameter less than that of the conductive portion.

3. Plug type module according to claim 2 , wherein the conductive portion ( 25 ) is equipped with at least one circumferential spring contact ( 28 ).

4. Plug type module according to claim 2 , wherein the guiding pin ( 26 ) is at least partially covered on its cylindrical surface by a low friction sleeve ( 27 ) in order to facilitate its plugging-in.

5. Plug type module according to claim 1 , wherein said central flange part ( 2 a ) comprises fastening means ( 29 ) adapted to fix said plug type module on a wall.

6. Socket type module ( 30 ) forming a second section of a high voltage AC or DC wall bushing made in pure gas technology, said socket type module comprising an insulating tube ( 3 ) that is axially extended at a first end thereof by an internal tubular section of a central flange part ( 2 b ) arranged at a first end ( 31 ) of the socket type module, said central flange part ( 2 b ), said insulating tube and said central flange part ( 2 b ) of the socket type module surrounding a central cylindrical conductor ( 15 b ) that axially extends along the socket type module and has an extremity at said first end ( 31 ) of said socket type module, the socket type module having at its second end ( 32 ) a flange ( 4 ) that seals it and that supports the central conductor ( 15 b ), the socket type module being designed to receive on operation site a plug type module ( 20 ) forming an outer section of a high voltage AC or DC wall bushing made in pure gas technology by reversibly sealing the central flange part ( 2 a ) of the plug type module with the central flange part ( 2 b ) of said socket type module and by removably connecting said extremity of the central conductor ( 15 b ) of said socket type module to said extremity of the central conductor ( 15 a ) of the plug type module, in this way the plug and socket modules can be transported as separate parts to be assembled on site, wherein the length of the central conductor ( 15 b ) of the socket type module is less than that of the socket type module, the extremity of the central conductor located at the first end ( 31 ) of the socket type module being provided with a hollow connective shield ( 40 ) that axially extends outside the socket type module, said connective shield ( 40 ) comprising a bore having an increasing diameter towards the free extremity of the connective shield so as to form a socket for receiving an adapted extremity of the central conductor ( 15 a ) of the plug type module ( 20 ) and to allow an electrical contact between the central conductor of the plug type ( 20 ) and the central conductor of said socket type module.

7. Socket type module according to claim 6 , wherein the internal section of the connective shield ( 40 ) presents a first ( 34 ), a second ( 35 ), and a third ( 36 ) portions, the internal diameter of said third portion ( 36 ) being approximately equal to the diameter of the guiding pin ( 26 ) of the central conductor of the plug type module, the internal diameter of said second portion ( 35 ) being approximately equal to the diameter of the conductive portion ( 25 ) of the central conductor of the plug type module and, the central conductor ( 15 a ) having a constant main diameter over most of its length, the internal diameter of said first portion ( 34 ) being approximately equal to said main diameter.

8. Socket type module according to claim 6 , wherein said central flange part ( 2 b ) comprises fastening means ( 29 ) adapted to fix said socket type module on a wall.

9. Socket type module according to claim 6 , wherein said central flange part ( 2 b ) comprises a plurality of drilled holes ( 38 ) to allow the insertion of removable supports ( 39 ) to serve as mechanical supports for the central conductor ( 15 b ) at the first end ( 31 ) of the socket type module.

10. High voltage AC or DC wall bushing made in pure gas technology comprising the socket type module according to claim 6 , the wall bushing further comprising:
a plug type module ( 20 ) forming one section of the high voltage AC or DC wall bushing made in pure gas technology, said plug type module comprising an insulating tube ( 3 ) that is axially extended at a first end thereof by an internal tubular section of a central flange part ( 2 a ) arranged at a first end ( 21 ) of the plug type module, said insulating tube ( 3 ) and said central flange part ( 2 a ) surrounding a central cylindrical conductor ( 15 a ), said conductor axially extends along the plug type module and has an extremity at said first end ( 21 ) of said plug type module, wherein said central flange part ( 2 a ) of the plug type module comprises at least one support insulator ( 41 , 42 , 43 ) connecting the internal tubular section of the central flange part ( 2 a ) of said plug type module to a sliding bush ( 44 ) that surrounds the central conductor ( 15 a ), said central conductor axially extending outside said plug type module at the first end thereof, wherein the extremity of said central conductor has a diameter decreasing towards its end, the plug type module having at its second end ( 22 ) a flange ( 4 ) that seals it and that supports the central conductor, said plug type module being designed to be electrically plugged on operation site into a socket type module ( 30 ) that forms the other section of a high voltage AC or DC wall bushing made in pure gas technology by reversibly sealing the central flange part ( 2 a ) of said plug type module with a central flange part ( 2 b ) of the socket type module and by removably connecting said extremity of the central conductor ( 15

Assignees

• Testin Giovanni
• Crocco Luca
• Sehovac Milorad
• Alstom Technology Ltd

Inventors

• Testin Giovanni
• Crocco Luca
• Sehovac Milorad

Classifications

• H01B17/26 Primary

  Lead-in insulators; Lead-through insulators · CPC title

• H02B13/0358

  Connections to in or out conductors (connectors in general H01R) · CPC title

• H02G5/002

  Joints between bus-bars for compensating thermal expansion · CPC title

• H01B17/30

  Sealing · CPC title

• H02G5/061

  Tubular casings (H02G5/063 takes precedence) · CPC title