EP3391396A1 - Current transformer for high voltage gas insulated switchgear substation - Google Patents

Current transformer for high voltage gas insulated switchgear substation

Info

Publication number
EP3391396A1
EP3391396A1 EP16809436.5A EP16809436A EP3391396A1 EP 3391396 A1 EP3391396 A1 EP 3391396A1 EP 16809436 A EP16809436 A EP 16809436A EP 3391396 A1 EP3391396 A1 EP 3391396A1
Authority
EP
European Patent Office
Prior art keywords
housing
current transformer
tubelike
insulating
peg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP16809436.5A
Other languages
German (de)
French (fr)
Inventor
Martin Odehnal
Lukas Belehrad
Petr Michlicek
Andy-Hai Liu
Thomas Braun
Walter Holaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Publication of EP3391396A1 publication Critical patent/EP3391396A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/0356—Mounting of monitoring devices, e.g. current transformers

Definitions

  • the invention relates to a current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing, according to the preamble of claim 1 .
  • standard current transformer for high voltage application consists of two flanges connected by screws, insulation parts and other component.
  • the standard connection is high risky for good quality, mechanical stability and sealing protection for SF6.
  • the Invention is, that the aforesaid flanges are fixed to the insulating tubelike housing by glueing in that way, that both flanges are provided with a peg-like portion, whose external diameter corresponds with the inner diameter of the insulating tubelike housing in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both
  • the outer surface of the the peg-like portions are provided with a rough or micro structured surface, by sandblasting or knurling, in order to result in a higher grip for the glue.
  • the invention is, that the aforesaid flanges are provided with a peg-like portion, whose measure of the external diameter corresponds with the measure of the inner diameter of the tubelike housing, in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both corresponding surfaces is provided before pushing into the insulating housing with a glue.
  • At least the outer surface of the peg-like portions are pretreated by sandblasting, knurling or etching, in order to enlarge the microstrutured surface for resulting in more grip, for the deposed glue.
  • FIG. 1 An embodiment of the invention is shown in Figure 1 .
  • the two aluminum flanges 2 of the resulting current transformer housing is made by casting, or forging or machining, and are connected together via an insulation tube 1 .
  • the flanges which are preferably made of aluminum, have special surface preparation, for example by sandblasting, or knurling, or etching, in order to result a higher mechanical joint strength and special groves area 2 * for insulation purpose additionally.
  • This surface is covered by glue, specially chosen to be suitable for using in SF6 environment, for additional sealing.
  • the insulation tube is especially adapted for application in SF6 environment and based on the mechanical strength requirements.
  • Aluminum flanges are finally pressed with their peg-like portions into the insulation tube, to make a final compact design.

Abstract

The invention relates to a current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing, according to the preamble of claim 1. In order to enhance the connection of the aforesaid two flanges, in order result in high level mechanical stability and sealing, the invention is, that the aforesaid flanges are fixed to the insulating tubelike housing (1) by glueing in that way, that both flanges (2) are provided with a peg-like portion (2*), whose external diameter corresponds with the inner diameter of the insulating tubelike housing (1), in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both corresponding surfaces is provided with a glue.

Description

Current transformer for high voltage gas insulated switchgear substation
The invention relates to a current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing, according to the preamble of claim 1 .
Current transformers for high voltage application located outside of SF6 insulation with pressed aluminum flanges connection are used in high voltage gas insulated switchgear substation.
Furthermore, standard current transformer for high voltage application consists of two flanges connected by screws, insulation parts and other component. The standard connection is high risky for good quality, mechanical stability and sealing protection for SF6.
So it is an object of the invention is, to enhance the connection of the aforesaid two flanges, in order result in high level mechanical stability and sealing.
The Invention is, that the aforesaid flanges are fixed to the insulating tubelike housing by glueing in that way, that both flanges are provided with a peg-like portion, whose external diameter corresponds with the inner diameter of the insulating tubelike housing in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both
corresponding surfaces is provided with a glue. In a further advantageous embodiment, the outer surface of the the peg-like portions are provided with a rough or micro structured surface, by sandblasting or knurling, in order to result in a higher grip for the glue.
By that is given a better mechanical connection, as well as additionally a perfect tightness.
According to a method for producing a current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing, for a current transformer, the invention is, that the aforesaid flanges are provided with a peg-like portion, whose measure of the external diameter corresponds with the measure of the inner diameter of the tubelike housing, in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both corresponding surfaces is provided before pushing into the insulating housing with a glue.
In a further advantageous embodiment, before deposition of the glue, at least the outer surface of the peg-like portions are pretreated by sandblasting, knurling or etching, in order to enlarge the microstrutured surface for resulting in more grip, for the deposed glue.
An embodiment of the invention is shown in Figure 1 .
The two aluminum flanges 2 of the resulting current transformer housing is made by casting, or forging or machining, and are connected together via an insulation tube 1 . The flanges, which are preferably made of aluminum, have special surface preparation, for example by sandblasting, or knurling, or etching, in order to result a higher mechanical joint strength and special groves area 2* for insulation purpose additionally. This surface is covered by glue, specially chosen to be suitable for using in SF6 environment, for additional sealing. The insulation tube is especially adapted for application in SF6 environment and based on the mechanical strength requirements.
Aluminum flanges are finally pressed with their peg-like portions into the insulation tube, to make a final compact design.
For this operation special adapted electrical press machine is used. To keep GIS functionality, it is necessary, to achieve high toleration of total length of current transformer and precise thread holes position of both flanges for final GIS assembly.

Claims

Claims
1 . Current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing,
characterized in
that the aforesaid flanges are fixed to the insulating tubelike housing (1 ) by glueing in that way, that both flanges (2) are provided with a peg-like portion (2*), whose external diameter corresponds with the inner diameter of the insulating tubelike housing (1 ), in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both corresponding surfaces is provided with a glue.
2. Current transformer according to claim 1 ,
characterized in
that the outer surface of the the peg-like portions are provided with a rough or micro structured surface, by sandblasting or knurling, in order to result in a higher grip for the glue.
3. Method for producing a current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing, for a current transformer according to claim 1 or 2,
characterized in
that the aforesaid flanges are provided with a peg-like portion, whose measure of the external diameter corresponds with the measure of the inner diameter of the tubelike housing, in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both corresponding surfaces is provided before pushing into the insulating housing with a glue.
4. Method according to claim 3,
characterized in
that before deposition of the glue, at least the outer surface of the peglike portions are pretreated by sandblasting, knurling or etching, in order to enlarge the microstrutured surface for resulting in more grip, for the deposed glue.
EP16809436.5A 2015-12-18 2016-12-15 Current transformer for high voltage gas insulated switchgear substation Pending EP3391396A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15201252.2A EP3182427B1 (en) 2015-12-18 2015-12-18 Current transformer for high voltage gas insulated switchgear substation
PCT/EP2016/081162 WO2017102932A1 (en) 2015-12-18 2016-12-15 Current transformer for high voltage gas insulated switchgear substation

Publications (1)

Publication Number Publication Date
EP3391396A1 true EP3391396A1 (en) 2018-10-24

Family

ID=55022315

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15201252.2A Active EP3182427B1 (en) 2015-12-18 2015-12-18 Current transformer for high voltage gas insulated switchgear substation
EP16809436.5A Pending EP3391396A1 (en) 2015-12-18 2016-12-15 Current transformer for high voltage gas insulated switchgear substation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15201252.2A Active EP3182427B1 (en) 2015-12-18 2015-12-18 Current transformer for high voltage gas insulated switchgear substation

Country Status (3)

Country Link
EP (2) EP3182427B1 (en)
CN (1) CN108475577B (en)
WO (1) WO2017102932A1 (en)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR779834A (en) * 1933-11-21 1935-04-13 Alsthom Cgee Provisions applicable to high-voltage electrical appliances, in particular current transformers, insulated by pressurized gas
GB1255661A (en) * 1968-04-05 1971-12-01 Lucas Industries Ltd Ignition coils
DE4318367A1 (en) * 1993-05-28 1994-12-01 Siemens Ag Metal-encapsulated high-voltage switching installation
FR2769123B1 (en) * 1997-09-29 1999-12-10 Transfix Toulon Soc Nouv INSULATING BUSHING FOR MV / LV TRANSFORMER
FR2774803B1 (en) * 1998-02-09 2001-04-27 Gec Alsthom Ag INTENSITY TRANSFORMER FOR A GAS INSULATED SWITCHING INSTALLATION
CN2603997Y (en) * 2003-01-13 2004-02-18 陈永华 High-voltage circuit automatic clutch
DE102005003870A1 (en) * 2005-01-21 2006-08-03 Siemens Ag Housing assembly surrounded by an electrical insulation circuit trace
ITMO20060263A1 (en) * 2006-08-28 2008-02-29 Scm Group Spa DISTRIBUTOR DEVICE OF GLUE
CN201886877U (en) * 2010-12-14 2011-06-29 何平 Enhanced dual-sealing-structure transformer sleeve pipe
EP2800112A1 (en) * 2013-04-29 2014-11-05 ABB Technology AG HV instrument transformer
CN203351400U (en) * 2013-07-30 2013-12-18 广州白云电器设备股份有限公司 Current transformer applied to gas-insulated metal-enclosed switchgears
CN203721471U (en) * 2013-12-16 2014-07-16 沈阳华德海泰电器有限公司 Removable current transformer
CN204270857U (en) * 2014-12-12 2015-04-15 开元电气大厂有限公司 LBW32-10 type switch protection Current Transformer

Also Published As

Publication number Publication date
CN108475577A (en) 2018-08-31
EP3182427A1 (en) 2017-06-21
WO2017102932A1 (en) 2017-06-22
CN108475577B (en) 2021-05-25
EP3182427B1 (en) 2020-05-20

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