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US3909759A - Bushing well for instrument transformer and transformers including such well - Google Patents

Bushing well for instrument transformer and transformers including such well Download PDF

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Publication number
US3909759A
US3909759A US458585A US45858574A US3909759A US 3909759 A US3909759 A US 3909759A US 458585 A US458585 A US 458585A US 45858574 A US45858574 A US 45858574A US 3909759 A US3909759 A US 3909759A
Authority
US
United States
Prior art keywords
well
molded
instrument transformer
bushing
bushing well
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.)
Expired - Lifetime
Application number
US458585A
Other languages
English (en)
Inventor
Ronald J Ouellette
Robert S Canney
Ralph B Stetson
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US458585A priority Critical patent/US3909759A/en
Priority to CA221,155A priority patent/CA1031436A/en
Priority to DE19752514039 priority patent/DE2514039A1/de
Priority to CH418875A priority patent/CH589922A5/xx
Priority to BE155196A priority patent/BE827692A/xx
Application granted granted Critical
Publication of US3909759A publication Critical patent/US3909759A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S439/00—Electrical connectors
    • Y10S439/921—Transformer bushing type or high voltage underground connector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S439/00—Electrical connectors
    • Y10S439/931—Conductive coating

Definitions

  • ABSTRACT Bushing well for use with instrument transformers is molded of a silica filled epoxy material having a conductive ground coating on one end and an opening at the other end to receive the high voltage conductor of the instrument transformer. A conductive coating is provided at such other end to form a high voltage shield for the instrument transformer conductor.
  • the bushing well is molded into the body of a dry-type instrument transformer with the ground coating end adapted to receive a termination module and the conductor of such transformer extending through the opening and into the bushing well.
  • This invention relates to instrument transformers and more particularly to a novel bushing well for use with instrument transformers.
  • instrument transformers such as current transformers and potential transformers to provide isolation from high voltage circuits and to provide a means of transforming high voltagesor currents to values that are convenient for measuring or for use in control circuits.
  • the high voltage terminal is provided with a blade or othermeans for clamping a high voltage lead to the terminal. See for example, US. Pat. No. 2,997,526.
  • terminations, orseparable connectors have become available in the distribution field. With these devices now available, it is desirable to provide instrument transformers which-are capable of being used with such separable connectors.
  • a further objectof this invention is to provide a drytype instrument transformer with a molded bushing well molded thereirrfor use with termination modules and separable connectors.
  • this invention comprises a molded bushing well preferably molded of an epoxy material.
  • the bushing well is cup shaped in form, having a first or outer end portion of one diameter and a second or inner end portion of a larger diameter.
  • a groove is formed on the outer surface between such portions of different diameter.
  • the exterior surface of the first or outer portion is provided with a conductive coating, which extends into the groove, for use as a ground shield.
  • the inner surface of the well is provided with a tapered wall contoured to accept a termination module and has an opening at the base therein for receiving a conductor stud from the high voltage conductor of the instrument transformer.
  • the surface of such opening and the rear portion of the well has a conductive coating for cooperating with the conductor stud to eliminate high voltage stresses in this end of the well.
  • the bushing well is molded into the surface of an instrument transformer.
  • the groove is used to secure the bushing well in the instrument transformer and the bushing well provides a means for attaching a termination module to the instrument transformer.
  • FIG. 1 is a perspective view, partially in section, viewed from the front end, of the preferred form of molded bushing well according to this invention
  • FIG. 2 is a perspective view, partially in section, similar to FIG. 1 but viewed from the inner end, showing the preferred form of molded bushing well according to the invention
  • FIG. 3 is a partial sectional view showing the bushing well of FIGS. 1 and 2 molded in place in an instrument transformer, and;
  • FIG. 4 is a front elevational view of one form of instrument transformer showing an application of the bushing well of this invention.
  • a molded bushing well is provided for use with dry-type instrument transformers.
  • the bushing well 10 is a substantially cup shaped member having a first exterior surface 12 of one diameter and a second exterior surface 14 of a larger diameter.
  • the surface 12, which forms the outer end portion of the bushing 10, and the surface 14, which forms the inner end portion of bushing 10, mate in a groove 16.
  • the groove 16 is used to lock the bushing well 10 into the body of an instrument transformer as will be described more fully hereafter.
  • the bushing well 10 is preferably molded of a silica filled epoxy resin material which provides good dielectric strength and dimensional stability.
  • a silica filled epoxy resin material which provides good dielectric strength and dimensional stability.
  • other electrical insulating resinous materials may be used as desired.
  • the instrument transformer with which the bushing well is to be used is molded of a butyl material, see US. Pat. No. 2,997,526, the well may also be molded of a similar butyl material.
  • the surface 12 and end 18 forming the outer portion of the bushing well 10 are coated with a conductive material 20.
  • the conductive material 20 may be a conductive adhesive which will improve the adherence of the material of the bushing well to the insulation of the instrument transformer.
  • the conductive coating 20 will mate with the ground shield of the termination module (not shown) as well as relieving any voltage stress at the interface of the bushing well 10 and the instrument transformer insulation.
  • the bushing well 10 is provided with an inwardly tapering inner surface or well 22 and has a groove 24 at the bottom or base 26 contoured to receive a termination module. See for example, U.S. Pat. Nos. 3,539,972 and 3,763,461.
  • the base 26 has an opening 28 which is adapted to receive a conductor stud of an instrument transformer.
  • the surface of the opening 28 is provided with a conductive coating 30.
  • the conductive coating 30 will cooperate with the conductor stud of an instrument transformer to provide a high voltage shield to eliminate any high voltage stress at the inner face of opening 28 and the conductor stud, as will be more clearly set out hereafter.
  • a depression 32 is provided in the exterior end of the bushing well for receivinga backup washer.
  • the surface of depression 32 is also provided with a conductive coating 34 which is electrically connected to theconductive coating 30.
  • FIG. 3 shows the bushing well 10 molded in place in an instrument transformer 40, only a portion of which is shown in FIG. 3.
  • the bushing 10 is molded into the body 42 of the instrument transformer 40.
  • the insulation 44 of the instrument transformer 40 surrounds almost the entire exterior surface of the bushing well 10 and completely fills the groove 16, firmly locking the bushing well 10 into the body 42 of instrument transformer 40.
  • the conductive coating mates with the ground coating 46 of theinstrument transformer 40 and also fills the interface between surface 12 of bushing well 10 and the insulation 44 of the instrument transformer 40, reducing the voltage stresses between such interface.
  • the conductive coating 20 will also mate with the ground shield on any termination module secured to bushing well 10.
  • a conductor stud 48 having a threaded end 50 extends through opening 28 into bushing well 10. As will be -well understood, conductor stud 48 is connected to the high voltage terminal or lead of instrument transformer 40. As will also be clear, the conductor stud 48 will provide the necessary connection to a termination module secured in bushing well 10. As is shown in FIG. 3,
  • backup washer.52 is secured in depression 32 and to the conductor stud 48. This backup washer will reduce mechanical stress on the bushing well 10.
  • FIG. 4' shows a front elevational view of an instrument transformer using the bushing well of this invention.
  • bushing wells 10 and 10a are molded into the body 42 of the instrument transformer 40.
  • termination modules can bereadily molded in such bushing wells and separable connector elbows can be used to attach high voltage lines to the instrument transformer in a manner well understood by those skilled in the art.
  • a molded bushing well for use with instrument transformers to provide high voltage connections thereto comprising: P
  • cup shaped body molded of electrical insulating material, said body having a first end portion with an outer surface of one diameter and a second or inner end portion with an'outer surface of a larger diameter, said end portions being joined 'by a groove.
  • said first outer surface having a conductive coating thereon
  • said cup shaped body having a well therein tapering inwardly from said first end and contoured to receive a termination module, the inner end of said well having an opening for receiving a threaded conductor stud of an instrument transformer, the surface of said opening in said inner end of said well being provided with a conductive coating.
  • An instrument transformer having a body-formed of insulating material and having the bushing well of claim 1 molded therein, the insulating material of said instrument transformer body surrounding substantially the entire outer surfaces of said bushing well and completely filling said groove between said first outer'surface and said second outer surface locking said well into the body of said instrument transformer, and a conductor stud of said instrument transformer extending through said opening and into said we'll.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
US458585A 1974-04-08 1974-04-08 Bushing well for instrument transformer and transformers including such well Expired - Lifetime US3909759A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US458585A US3909759A (en) 1974-04-08 1974-04-08 Bushing well for instrument transformer and transformers including such well
CA221,155A CA1031436A (en) 1974-04-08 1975-03-03 Bushing well for instrument transformers and transformers including such well
DE19752514039 DE2514039A1 (de) 1974-04-08 1975-03-29 Durchfuehrung fuer instrumentenwandler
CH418875A CH589922A5 (hu) 1974-04-08 1975-04-02
BE155196A BE827692A (fr) 1974-04-08 1975-04-08 Manchon de traversee moule pour transformateurs de mesure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US458585A US3909759A (en) 1974-04-08 1974-04-08 Bushing well for instrument transformer and transformers including such well

Publications (1)

Publication Number Publication Date
US3909759A true US3909759A (en) 1975-09-30

Family

ID=23821353

Family Applications (1)

Application Number Title Priority Date Filing Date
US458585A Expired - Lifetime US3909759A (en) 1974-04-08 1974-04-08 Bushing well for instrument transformer and transformers including such well

Country Status (5)

Country Link
US (1) US3909759A (hu)
BE (1) BE827692A (hu)
CA (1) CA1031436A (hu)
CH (1) CH589922A5 (hu)
DE (1) DE2514039A1 (hu)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019167A (en) * 1975-05-19 1977-04-19 Amerace Corporation Encapsulated transformer
US4740773A (en) * 1985-02-27 1988-04-26 Robert Bosch Gmbh Ignition device with a high-voltage terminal
US4763095A (en) * 1985-09-03 1988-08-09 Siemens Aktiengesellschaft Transformer with cast insulation jacket
US4982498A (en) * 1987-12-03 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Method of making a high-voltage transformer
US5145382A (en) * 1991-11-29 1992-09-08 Motorola, Inc. Molded plastic surface-mountable coaxial connector
US6783401B2 (en) * 1997-07-02 2004-08-31 The Regents Of The University Of California Apparatus for improving performance of electrical insulating structures
CN100532902C (zh) * 2007-11-09 2009-08-26 宁波三爱互感器有限公司 一种电力套管
CN103270342A (zh) * 2010-12-21 2013-08-28 利纳克有限公司 线性致动器
CN104051824A (zh) * 2013-03-13 2014-09-17 国际商业机器公司 组装连接器的方法及连接器
US9300029B2 (en) 2013-03-15 2016-03-29 International Business Machines Corporation Coaxial transmission line slot filter with absorptive matrix

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748184A (en) * 1951-04-04 1956-05-29 G & W Electric Speciality Co High voltage electric terminator
US3539972A (en) * 1968-05-21 1970-11-10 Amerace Esna Corp Electrical connector for high voltage electrical systems
US3763461A (en) * 1971-07-08 1973-10-02 Gen Electric Electric cable termination module having a gas-trap valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748184A (en) * 1951-04-04 1956-05-29 G & W Electric Speciality Co High voltage electric terminator
US3539972A (en) * 1968-05-21 1970-11-10 Amerace Esna Corp Electrical connector for high voltage electrical systems
US3763461A (en) * 1971-07-08 1973-10-02 Gen Electric Electric cable termination module having a gas-trap valve

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019167A (en) * 1975-05-19 1977-04-19 Amerace Corporation Encapsulated transformer
US4740773A (en) * 1985-02-27 1988-04-26 Robert Bosch Gmbh Ignition device with a high-voltage terminal
US4763095A (en) * 1985-09-03 1988-08-09 Siemens Aktiengesellschaft Transformer with cast insulation jacket
US4982498A (en) * 1987-12-03 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Method of making a high-voltage transformer
US5145382A (en) * 1991-11-29 1992-09-08 Motorola, Inc. Molded plastic surface-mountable coaxial connector
US6783401B2 (en) * 1997-07-02 2004-08-31 The Regents Of The University Of California Apparatus for improving performance of electrical insulating structures
CN100532902C (zh) * 2007-11-09 2009-08-26 宁波三爱互感器有限公司 一种电力套管
CN103270342B (zh) * 2010-12-21 2017-02-08 利纳克有限公司 线性致动器
US20130285494A1 (en) * 2010-12-21 2013-10-31 Linak A/S Linear actuator
CN103270342A (zh) * 2010-12-21 2013-08-28 利纳克有限公司 线性致动器
US10516318B2 (en) * 2010-12-21 2019-12-24 Linak A/S Linear actuator
CN104051824A (zh) * 2013-03-13 2014-09-17 国际商业机器公司 组装连接器的方法及连接器
WO2014163730A3 (en) * 2013-03-13 2015-11-05 International Business Machines Corporation Microwave connector with filtering properties
GB2528199A (en) * 2013-03-13 2016-01-13 Ibm Microwave connector with filtering properties
US9270071B2 (en) 2013-03-13 2016-02-23 International Business Machines Corporation Microwave connector with filtering properties
GB2528199B (en) * 2013-03-13 2016-12-21 Ibm Microwave connector with filtering properties
US9948050B2 (en) 2013-03-13 2018-04-17 International Business Machines Corporation Method of assembling microwave connector with filtering properties having outer and inner conductors
US9300029B2 (en) 2013-03-15 2016-03-29 International Business Machines Corporation Coaxial transmission line slot filter with absorptive matrix
US9847568B2 (en) 2013-03-15 2017-12-19 International Business Machines Corporation Method of forming a coaxial transmission line slot filter with absorptive matrix
US10756410B2 (en) 2013-03-15 2020-08-25 International Business Machines Corporation Coaxial transmission line slot filter with absorptive matrix

Also Published As

Publication number Publication date
CA1031436A (en) 1978-05-16
BE827692A (fr) 1975-07-31
DE2514039A1 (de) 1975-10-16
CH589922A5 (hu) 1977-07-29

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