US3118966A - Electrical apparatus - Google Patents

Electrical apparatus Download PDF

Info

Publication number
US3118966A
US3118966A US70576A US7057660A US3118966A US 3118966 A US3118966 A US 3118966A US 70576 A US70576 A US 70576A US 7057660 A US7057660 A US 7057660A US 3118966 A US3118966 A US 3118966A
Authority
US
United States
Prior art keywords
terminal
gas
bushing
liquid
tank
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
US70576A
Other languages
English (en)
Inventor
Russell N Yeckley
Jr Robert G Colcaser
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US70576A priority Critical patent/US3118966A/en
Priority to JP4151461A priority patent/JPS3820336B1/ja
Application granted granted Critical
Publication of US3118966A publication Critical patent/US3118966A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices

Definitions

  • the present invention relates to electrical apparatus in general and, more particularly, to electrical apparatus of the type having a terminal-bushing structure which extends into a tank containing electrical apparatus and having a dielectric gas therein.
  • a general object of the present invention is to provide improved electrical apparatus having a liquid-type terminal-bushing structure associated therewith, in which differential pressure across the one or more seals of the terminal-bushing structure is eliminated, to prevent entrance of the dielectric gas disposed within the tank structure from entering interiorly within the body of the terminalbushing structure.
  • a more specific object of the present invention is an improved terminal-bushing structure having gas passage means associated therewith to transmit gas from the body of a tank, with which the terminal-bushing structure is associated, up through the terminal-bushing to the upper surface of the liquid level within the terminal-bushing to thereby equalize the pressures imposed upon the terminalbuslr'ng seals.
  • a more specific object of the present invention is to provide an improved oil-filled terminal-bushing structure having a tubular terminal stud extending axially therealong for the transmission of pressure into a gas space disposed at the external end of the terminal-bushing for subjecting the liquid within the terminal-bushing to the same pressure as is present within a gas-fi1led tank structure, with which the terminal-bushing structure is associated.
  • a flexible diaphragm composed of a suitable material, such as neoprene, is employed to prevent direct contact of the transmitted gas with the oil within the terminal-bushing.
  • FIGURE 1 is an end elevational view of a circuitinterrupter tank structure embodying the improved terminal-bushing structure of the present invention.
  • FIGS. 2A and 2B collectively show an enlarged sectional view taken along the terminal-bushing illustrating the improved terminal-bushing structure of the present invention.
  • sulfur-hexalluoride SF gas-type circuit interrupter
  • sulfur-hexa'tluoride gas-filled terminal-bushings such as set forth in United States patent application filed iliifiiib Patented Jan. 21, 1964 "ice December 2, 1959, Serial No. 856,775, now United States Patent 3,059,044, issued October 16, 1962 to Robert E. Friedrich and James H. Frakes may be employed.
  • the sulfurhexafiuoride gas from the tank structure may be permitted to seep through a hollow terminal stud associated with the terminal-bushing and permitted to pass between the insulating shells and the terminal stud of the terminal-bushing, thereby serving as a dielectric gas for the terminal-bushing.
  • gas-filled bushings although having a major advantage by providing a substantial reduction in height obtained, have a somewhat disadvantage by supplying a potential tap, which requires a transistorized amplifier, such as set forth in United States Patent 2,924,726, issued February 9, 1960 to John F. Reuther, and assigned to the assignee of the instant application.
  • a liquid-filled, such as an oil-filled, bushing could be used.
  • a strong factor in favor of the use of such a liquid-filled bushing is its long history of trouble-free performance. Possible moisture problems may also be eliminated by the use of such a liquid-filled terminal-bushing. Because of its unique use in a gas-filled breaker, a shortened oil-filled bushing could be used with a conventional potential tap.
  • a circuit-interrupting apparatus 1 including a tank structure 2, having end caps 3, 4, out of which an interrupting assemblage 9 may be laterally removed.
  • a mechanism housing 11 is disposed adjacent one end of the three-pole circuit interrupting structure 1, as shown. Disposed within the mechanism housing 11 is suitable operating mechanism and compressor equipment, not shown, which functions to maintain the proper high pressure within a high-pressure tank, at high potential, associated with each of the interrupting struc/ tures 9 disposed within the several tank structures 2.
  • a pair of terminal-bushings '7, 8 for each pole-unit of the interrupter 1.
  • three such tank structures 2 are disposed in alignment and an operating rod 12 extends lengthwise of the three tank structures 2 and interconnects movement of the operating mechanism within housing 11 with the movable contact structure in each of the three pole-units.
  • FIGS. 2A and 2B collectively show more clearly the internal construction of each of the terminal-bushings 7, 8.
  • a weather-proof shell 13 is provided externally of the tank structure 2, and a dielectric body, such as a condenser body 14, surrounds a tubular terminal stud 15 for withstanding the high voltage existing between the terminal stud 15 and the grounded mounting flange 16 of the terminal-bushing 7.
  • mounting bolts 17 are employed to fixedly secure the terminalbushing 7 in a proper position with reference to the mounting cylinders 5, 6.
  • an interiorly disposed casing 21 composed of a suitable material, such as porcelain, which serves to prevent mixing of the sulfur-hexafluoride gas within the region 22, interiorly of the tank structure 2, and the region 23, within the terminal-bushing 7 about the condenser body 14.
  • a suitable liquid such as oil
  • a potential tap structure 26 is provided, which is normally grounded, but may, at times, be empioyed to measure the voltage present on the terminal stud 15.
  • a gas-tight seal 27 is provided between the lower end surface 28 of the porcelain casing 21 and a lower plate support 31, which is threadedly secured at 32 to the lower threaded end 33 of the holiow terminal stud l5.
  • Suitable springs 34 provided within a cap structure 35 provide pressure exerted upon the casings 13, 21., to maintain pressure upon the seals 27, 3d, 37 and an additional seal 38 at the upper end of the terminal-bushing 7.
  • the gas pressure within the region 22 may be of the order of 60 psi.
  • the gas pressure of the nitrogen gas which is usually above the liquid level of an oil-filled bushing, of conventional type, is only 8 or 9 pounds.
  • the tubular terminal stud 15 is provided, which transmits the gas pressure from within the tank structure 2 up into a gas space 41 upon the upper surface of the liquid level through vent openings 19. Additional openings 26 in a flange portion 35a of the cap structure 35 assist in such communication of gas pressure.
  • a pressure-transmitting partition means such as a flexible diaphragm i2 is provided so that the gas pressure may be imposed upon the liquid, but yet no direct contact therebetween is afforded.
  • the outer end of the tubular terminal stud 15 is threaded, as at 15a, to threadedly secure into place a supporting end portion 29.
  • the end portion 29, as shown, has radially outwardly extending arms 29a serving as upper seats for the compression springs 34.
  • the supporting end portion has a shoulder 2% provided thereon which abuts the inner periphery of the flexible diaphragm 42 in sealing relation.
  • a ring-shaped backup plate is disposed on the other side of the inner periphery of the flexible diaphragm 42, and a clamping nut 39 is threaded onto a threaded portion 290 of the end portion 29.
  • a cap wall portion 35a has a shoulder 35b formed thereon to sealingly engage the outer periphery of the races flexible diaphragm 42.
  • a sealing ring 4% has a plurality of circumferentially-spaced apertures as provided therein to accommodate a plurality of sealing bolts 39 which are threaded into tapped holes 35c of the cap structure 35. The result is a gas and oil seal provided by the flexible diaphragm 42 between the supporting end portion 29 and the portion 35a of the cap structure 35, with the diaphragm on, or close to, the liquid surface.
  • a perforated backup plate 43 is provided. As a result of this construction, there is imposed upon the liquid .24 the same pressure as exists within the tank structure 2. Consequently, there is no differential pressure existing upon the seals 27, 36 within the interior of the tank structure 2 and the seals consequently do not have to be of unique construction since no differential pressure exists thereacross.
  • Another advantage of the construction is that the use of the diaphragm 42 permits ease of handling the bushing during manufacturing or assembly, since the bushing may be positioned horizontally during handling.
  • sulfur-hexafluoride gas has been illustrated as the gas employed within the tank structure 2, it will be obvious to those skilled in the art that other gases may be employed, and that the present invention is applicable wherever it is desired to prevent differential pressure upon the seals associated with a terminal-bushing structure.
  • Electrical apparatus including a tank filled with an insulating gas, a liquid-filled terminal bushing extending within said gas-filled tank for the purpose of carrying current thereinto, terminal-stud means extending axially through the terminal bushing and having an end supporting portion, cap means defining a gas space within the terminal bushing adjacent the external end thereof above the liquid level, means providing a gas passage longitudinally through the terminal bushing from the interior end thereof to said gas space at the exterior end thereof above the liquid level within the terminal bushing, pressure-transmitting partition means including a flexible gasimpervious diaphragm, supporting means for supporting said flexible diaphragm substantially on the liquid surface between the liquid level and said gas space, said supporting means including said end supporting portion and a cap wall portion of said cap means, whereby the liquid Within the terminal bushing is subjected to the same pressure as the gas within the tank to eliminate differential pressure on the one or more seals disposed at the interior end of the terminal bushing.
  • Electrical apparatus including a tank filled with an insulating gas under pressure, a liquid-filled terminal bushing extending within said gasafilled tank for the purpose of carrying current thereinto and having a seal at the interior end thereof, terminal stud means extending axially through the terminal bushing and having an end supporting portion, cap means defining a gas space within the terminal bushing adjacent the external end thereof above the liquid level, means providing a gas passage longitudinally through the terminal bushing from the interior end thereof to said gas space at the exterior end thereof above the liquid level
  • pressure-transmitting partition means including a flexible gas-impervious diaphragm, supporting means for supporting said flexible diaphragm substantially on the liquid surface between the liquid level and said gas space, said supporting means including said end supporting portion and a cap wall portion of said cap means, whereby the liquid within the terminal bushing is subjected to the same pressure as the gas within the tank to eliminate differential pressure on said seal disposed at the interior end of the terminal bushing.
  • Electrical apparatus including a tank filled with an insulating gas, a liquid-filled terminal bushing extending within said gas-filled tank for the purpose of carrying current thereinto, terminal stud means including a tubular terminal stud extending axially through the terminal bushing and having an end supporting portion, cap means defining a gas space within the terminal bushing adjacent the external end thereof above the liquid level, means including said tubular terminal stud providing a gas passage longitudinally through the terminal bushing firom the interior end thereof to said gas space at the exterior end thereof above the liquid level within the terminal bushing, pressure-transmitting partition means including a flexible gas-impervious diaphragm, supporting means for supporting said flexible diaphragm substantially on the liquid surface between the liquid level and said gas space, said supporting means including said end supporting portion and a cap wall portion of said cap means, whereby the liquid within the terminal bushing is subjected to the same pressure as the gas within the tank to eliminate differential pressure on the one or more seals disposed at the interior end of the terminal bushing.
  • Electrical apparatus including a tank filled with an insulating gas under pressure, a liquid-filled terminal bushing extending within said gas-filled tank for the purpose of carrying current thereinto and having a seal at the interior end thereof, terminal stud means including a tubular terminal stud extending axially through the terminal bushing and having an end supporting portion, cap means defining a gas space within the terminal bushing adjacent the external end thereof above the liquid level, means including said tubular terminal stud providing a gas passage longitudinally through the terminal bushing from the interior end thereof to said gas space at the exterior end thereof above the liquid level within the terminal bushing, pressure transmitting partition means including a flexible gas-impervious diaphragm, supporting means for supporting said flexible diaphragm substantially on the liquid surface between the liquid level and said gas space, said supporting means including said end supporting portion and a cap wall portion of said cap means, whereby the liquid within the terminal bushing is subjected to the same pressure as the pressurized gas within the tank to eliminate differential pressure on said seal disposed at the interior end of the terminal
  • a liquid-filled terminal bushing having a tubular terminal stud, said tubular terminal stud having an end supporting portion, a solid dielectric body disposed about the tubular terminal stud extending lengthwise along the terminal bushing, at least one weather-proof insulating shell, a dielectric liquid disposed between the inner wall of the weather-proof shell and said solid dielectric body, cap means defining a gas space at one end of the bushing above the liquid level, pressure-transmitting partition means including a flexible gas-impervious diaphragm, supporting means for supporting said flexible diaphragm substantially on the liquid surface between the liquid level and said gas space, said supporting means including said end supporting portion and a cap wall portion of said cap means, passage means interconnecting the space within the tubular conductor stud with said gas space, whereby the liquid within the terminal bushing is subjected to the same pressure as the gas within the tank to which the terminal bushing is applied to eliminate differential pressure on the one or more seals disposed at the other end of the terminal bushing.

Landscapes

  • Insulators (AREA)
US70576A 1960-11-21 1960-11-21 Electrical apparatus Expired - Lifetime US3118966A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US70576A US3118966A (en) 1960-11-21 1960-11-21 Electrical apparatus
JP4151461A JPS3820336B1 (ja) 1960-11-21 1961-11-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70576A US3118966A (en) 1960-11-21 1960-11-21 Electrical apparatus

Publications (1)

Publication Number Publication Date
US3118966A true US3118966A (en) 1964-01-21

Family

ID=22096154

Family Applications (1)

Application Number Title Priority Date Filing Date
US70576A Expired - Lifetime US3118966A (en) 1960-11-21 1960-11-21 Electrical apparatus

Country Status (2)

Country Link
US (1) US3118966A (ja)
JP (1) JPS3820336B1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748368A (en) * 1972-09-25 1973-07-24 Westinghouse Electric Corp Electrical bushing assembly
US4214119A (en) * 1978-05-03 1980-07-22 General Electric Company Corrosive resistant seal for epoxy shell bushings, method of providing same, and gasket therefor
US5736704A (en) * 1996-02-02 1998-04-07 Gec Alsthom T & D Sa Circuit-breaker with grounded metal enclosure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228409A (en) * 1937-11-12 1941-01-14 Westinghouse Electric & Mfg Co Terminal bushing construction
US2315666A (en) * 1938-10-18 1943-04-06 Westinghouse Electric & Mfg Co Transformer bushing
US2981815A (en) * 1957-12-10 1961-04-25 Westinghouse Electric Corp Circuit interrupter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228409A (en) * 1937-11-12 1941-01-14 Westinghouse Electric & Mfg Co Terminal bushing construction
US2315666A (en) * 1938-10-18 1943-04-06 Westinghouse Electric & Mfg Co Transformer bushing
US2981815A (en) * 1957-12-10 1961-04-25 Westinghouse Electric Corp Circuit interrupter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748368A (en) * 1972-09-25 1973-07-24 Westinghouse Electric Corp Electrical bushing assembly
US4214119A (en) * 1978-05-03 1980-07-22 General Electric Company Corrosive resistant seal for epoxy shell bushings, method of providing same, and gasket therefor
US5736704A (en) * 1996-02-02 1998-04-07 Gec Alsthom T & D Sa Circuit-breaker with grounded metal enclosure

Also Published As

Publication number Publication date
JPS3820336B1 (ja) 1963-10-03

Similar Documents

Publication Publication Date Title
US3059044A (en) Terminal-bushing constructions
US3983345A (en) Method of detecting a leak in any one of the vacuum interrupters of a high voltage circuit breaker
US2981815A (en) Circuit interrupter
US4511873A (en) Current transformer insulated by pressurized gas
US4442329A (en) Dead tank housing for high voltage circuit breaker employing puffer interrupters
US3214550A (en) Circuit interrupters with crossbars captively related to piston structures
US3163736A (en) High voltage gas type circuit interrupter
US3114815A (en) Fluid-blast circuit interrupter with improved current-transformer housing means
US3118966A (en) Electrical apparatus
US3114816A (en) Circuit breaker of gas blast type having insulator bushing means for externally locating an impedance means
US3903387A (en) Gas-insulated switching apparatus
US3009983A (en) Bushing structure for electric apparatus
US2965735A (en) Compressed-gas circuit interrupter
US3242251A (en) Bushing device for introducing current conductor into compressed gas switch chambers
US3819845A (en) Termination for metal enclosed, compressed gas insulated electrical conductor
US3624450A (en) Metal enclosed gas insulated lightning arrester
US3790695A (en) Electrical insulator of porous expanded plastics material
US3287531A (en) Terminal bushing having impedance means associated therewith
US2997564A (en) Circuit interrupter
US3753045A (en) Shielded metal enclosed lightning arrester
US3827731A (en) Expansion joint for tubular insulating gas-filled enclosure for high-voltage conductor
US3787604A (en) Conductor support for transition from gas bus enclosure tube to power circuit breaker
US2999143A (en) Compressed-gas circuit interrupter
US3160701A (en) Electrical apparatus
US3509267A (en) Multipurpose insulating column