US3846601A - Compressed-gas circuit interrupter - Google Patents

Compressed-gas circuit interrupter Download PDF

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Publication number
US3846601A
US3846601A US00240144A US24014472A US3846601A US 3846601 A US3846601 A US 3846601A US 00240144 A US00240144 A US 00240144A US 24014472 A US24014472 A US 24014472A US 3846601 A US3846601 A US 3846601A
Authority
US
United States
Prior art keywords
arc
blast
insulating
pair
gas
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
US00240144A
Other languages
English (en)
Inventor
W Leeds
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 Inc USA
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 US00240144A priority Critical patent/US3846601A/en
Priority to AU51652/73A priority patent/AU5165273A/en
Priority to CA162,956A priority patent/CA977807A/en
Priority to ES412368A priority patent/ES412368A1/es
Priority to JP48028104A priority patent/JPS498769A/ja
Priority to DE19732314057 priority patent/DE2314057A1/de
Priority to GB1331073A priority patent/GB1422997A/en
Priority to FR7311123A priority patent/FR2178911B1/fr
Priority to NL7304303A priority patent/NL7304303A/xx
Priority to CH452273A priority patent/CH547545A/xx
Priority to IT22405/73A priority patent/IT981794B/it
Priority to BE1004932A priority patent/BE797555A/xx
Priority to SE7304641A priority patent/SE388306B/xx
Application granted granted Critical
Publication of US3846601A publication Critical patent/US3846601A/en
Priority to JP1981167157U priority patent/JPS57109543U/ja
Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H33/56—Gas reservoirs
    • H01H33/562—Means for avoiding liquefaction or for disposing of liquefaction products
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas

Definitions

  • a high-voltage compressed-gas circuit interrupter is Filed Mar 31 1972 provided including a tank structure, and a terminal bushing extending therein supporting an arc- Appl. No.: 240,144 extinguishing unit.
  • a high-pressure gas-reservoir chamber is disposed adjacent the inner end of the ter- US Cl 200/148 B 200/145 200/148 F minal bushing for close proximity to the separable [51] i 33/82 contact structure of the arc-extinguishing unit.
  • Additional features include a blast-valve means, 200 143 F disposed in close proximity to the stationary contact structure, and the partial storage of high-pressure gas References Cited within the hollow stud of the terminal bushing to UNITED STATES PATENTS prevent liquefaction of a liquefiable gas under low-ambient temperature conditions
  • Another feature of the invention includes a rotating United States Patent [19] Leeds COMPRESSED-GAS CIRCUIT [58] Field of Search........
  • High-voltage gas-type circuit breakers are needed which are capable of interrupting fault currents within two cycles (at a 60-cycle frequency) after energizing the trip coil. It is a particular purpose of the present invention to provide particular constructional features to speed up the opening operation of a compressed-gas circuit interrupter to attempt to achieve this rating.
  • a high-pressure gas reservoir is located at the interior end of each of two terminal bushings extending within a circuit-interrupter tank structure, so as to provide a readily available supply of high-pressure arcextinguishing gas for effecting arc extinction.
  • a rotating insulating operating tube is provided to eliminate inertia effects, and also to provide a desired correlation between opening the movable contact structure and opening of the movable blastvalve structure.
  • this tubular insulating operating-rod structure the annular volume between the supporting insulating column and the outer wall of the rotating insulating operating rod is at a minimum, to thereby eliminate the hazard of injury to operating personnel from fracture of the insulating column, such as a porcelain column, should it occur due to earthquake shock, lightning strokes, etc.
  • a tank structure including a terminal bushing extending therewithin, at least partially supporting an arc-extinguishing unit adjacent the interior end of the terminal bushing.
  • a high-pressure reservoir tank is supported adjacent the inner end of the terminal bushing and in close proximity to the arc-extinguishing unit.
  • a blast-valve structure is linked with the operating rod of the circuit breaker, which is preferably rotatable. The linkage for the separable contact structure of the arc-extinguishing unit is connected to the upper end of the rotatable operating rod of the interrupter.
  • desirable features of the invention include a plate electrically interconnecting the two stationary contact structures of the device, when it is of the double-break construction, so as to transfer the heat to the outer metallic walls of the surrounding tank structure.
  • a more specific object of the present invention is to provide an improved compressed-gas circuit interrupter of the live tank type, that is, the type including a metallic tank supported up in the air by an insulating column, and at line voltage in the closed-circuit position of the interrupter.
  • Another object of the present invention is the provision of an improved compressed-gas circuit interrupter in which a pair of terminal bushings extend interiorly within an enclosed metallic tank, and carry stationary contact structures adjacent their interior ends. It is an important feature of the present invention to associate with said relatively stationary contact structures highpressure reservoir tanks also disposed adjacent the interior ends of the terminal bushings, and so arranged as to quickly force high-pressure blasts of gas into the established arcs.
  • Still a further object of the present invention is the provision of an improved operating arrangement for a compressed-gas circuit interrupter.
  • this assumes the form of a rotating insulating operating tube extending upwardly through a supporting column structure.
  • Yet a further object of the present invention is the provision of an improved double-break compressed-gas circuit interrupter of a type adapted for multiple use, that is, each unit being of modular construction, and adapted for series arrangement for the higher-voltages.
  • Still a further object of the present invention is the provision of an improved compressed-gas circuit interrupter in which liquefaction of the arc-extinguishing gas, during low ambient temperature conditions, is prevented by associating the high-pressure reservoir tanks with the terminal bushings, whereby the current flow through the terminal bushings effects a desired heating effect upon the high-pressure arc-extinguishing gas preventing the liquefaction thereof.
  • Yet a further object of the present invention is the provision of an improved compressed-gas circuit interrupter in which a conducting supporting plate structure is provided within the circuit-interrupter tank, which not only serves the function of transmitting current flow between the two serially related arc-extinguishing units, but also provides a desired supporting structure for the movable operating linkage of the circuit interrupter.
  • FIG. I is a side elevational view, partially in vertical section, of a compressed-gas circuit interrupter embodying features of the present invention, the contact structure being illustrated in the closed-circuit position;
  • FIG. 2 is a fragmentary vertical cross-sectional view taken through the upper portion of the circuitinterrupter structure of FIG. 1, the contact structure, however, being illustrated in the partially open-circuit position;
  • FIG. 3 is a fragmentary detailed view showing, to an enlarged scale, the pilot exhaust-valve structure for the blast valves.
  • the reference numeral 1 generally designates a compressed-gas circuit interrupter.
  • the circuit-interrupting structure 1 includes a live spherical metallic circuit-interrupter tank 2 disposed at the upper end of an insulating column 3, the latter being formed of any suitable material, such as prcelain, for example, so as to take advantage of its weathering characteristics.
  • each relatively stationary contact structure 6 surrounding the rearward side of each relatively stationary contact structure 6, is a highpressure reservoir 12, 13, which may assume either a spherical configuration, or a generally horizontally disposed cylindrical configuration.
  • the purpose for each compressed-gas reservoir 12, 13 is to provide a ready supply of high-pressure arc-extinguishing gas, such as (SP gas, for the arc-extinguishing operation, as more fully described hereinafter.
  • SP gas high-pressure arc-extinguishing gas
  • each straight-line linkage 10, 11 com prises a bracket 20, a connecting link 21, an actuating bell-crank 22, and an operating link 23.
  • the operating links 23 are preferably connected to diametrically opposite sides of the rotating operating tube 16.
  • blast-valve structures are employed, being actuated by exhaust pilot valves 34, 35.
  • the exhaust pilot valves 34 are connected by floating insulating links 36, 37 to operating levers 38, 39, which, in turn, have their inner ends pivotally connected to an upstanding operating rod 40.
  • the lower end of the pilot-valve operating rod 40 is guided by a stationary guide 40a. Also, it has a cam follower roller 40b actuated by a cam structure 43, which is formed at the upper periphery of the rotating insulating operating tube 16.
  • the rotating insulating tube 16 is rotated in the opposite direction to thereby effect contact closure.
  • the blast valves 30 may be operated during the closing operation, or suitable linkage, not shown, may be employed to effect a one-way actuation of the blast-valve structures 30 so that the blast effect is eliminated during the closing stroke of the circuit interrupter 1.
  • the straight-line linkages 10, 11 are supported by, and the movable tubular contact structures 8, 9 are guided by, fingers 58 affixed to a generally horizontally extending conducting plate structure 60.
  • Very high continuous current ratings for the contacts 8, 9 are obtained by directing the current flow from the moving contacts 8, 9 through the fingers 58 and into the current-carrying plate structure 60, which is secured, as by welding, for
  • a high-pressure insulating supply tube may be situated generally axially of the rotating insulating operating tube 16, and serves to maintain the pressure within the pressure chambers 12, 13 at an adequate pressure level necessary for efficient arc interruption.
  • a suitable compressor 74 may be utilized, in conjunction with a grounded high-pressure reservoir 76, to supply the (SP gas at the requisite pressure level.
  • the gas, to be taken by the inlet side 74a of the compressor 74, may be extracted from the lower end of the supporting column 3.
  • Suitable operating mechanism which forms no part of the present invention, may be disposed within a mechanism compartment to effect opening and closing rotative action of the insulating operating tube 16.
  • an improved high-voltage gastype circuit interrupter l capable of interrupting fault currents in an extremely short time, such as in the order of two cycles after energizing the trip coil.
  • the live-tank construction has the following special features to speed up the interrupting operation:
  • the high-pressure reservoirs 12, 13 are located on the interrupter end of each terminal bushing 4, 5 in the live-tank module 2.
  • the blast valve 30 is disposed closely adjacent to each set of stationary contact fingers 6 for minimum delay in getting high-pressure (SF gas into the arcing zone.
  • a low-inertia tubular insulating operating rod 16, in the supporting porcelain column 3, provides high-speed mechanical operation. This tube 16 rotates to move the straight-line linkages l0, 11 connected to the moving arcing contacts 8, 9.
  • An important special safety feature of the present invention is that only a small gas volume 3a is available between the rotating insulating operating rod 16 and the surrounding porcelain column 3 to propel fragments, in the event that the porcelain column 3 is fractured by an accident, or by earthquake conditions.
  • Another important feature of the present invention is the use of low-inertia small insulating rods 36, 37 to operate the pilot valves 34, 35, exhausting pressure behind the main blast-valve pistons 50 on each terminal 4, 5 to provide a fast blast-valve opening action.
  • a very high continuous current rating for the contacts 8, 9 is obtained by the utilization of the contact fingers 58 transmitting the current flow through the generally horizontally extending conducting plate structure 60.
  • a compressed-gas circuit interrupter including a metallic tank and a terminal bushing extending therein, an arc-extinguishing unit including separable contact structure, at least, partically supported by the interior end of said terminal bushing, a high-pressure gasreservoir chamber also supported adjacent the inner end of the terminal bushing and supported thereby for close proximity to said separable contact structure, and the gas exhausting during arc interruption into the general region within said metallic tank.
  • blastvalve means are associated with each of the arcextinguishing units, and piston means are utilized to actuate said blast-valve means.
  • each terminal bushing supports an arc-extinguishing unit including separable contact structure and an associated high-pressure gas-reservoir chamber
  • a generally horizontally extending conducting plate structure is fixedly secured to the side walls of the tank structure and has sliding contact means associated therewith, each arc-extinguishing unit having a movable contact making sliding contacting engagement with said sliding contact means, whereby the generally horizontally extending plate structure provides a current-conducting path between the two arc-extinguishing units.
  • bracket means for structurally supporting the operating linkage for each movable contact.
  • a compressed-gas circuit interrupter including an upstanding hollow insulating column, a rotatable insulating operating tube extending axially of said insulating column and having only slight clearance therebetween, means for guiding rotating movement of said insulating rotatable operating tube, a pair of terminal bushings extending within the live metallic tank and carrying arc-extinguishing units and high-pressure gasreservoir chambers at the interior ends thereof, blastvalve means associated with each high-pressure gasreservoir chamber, separable contact means associated with each arc-extinguishing unit, and operating means for the movable contact structure and the blast-valve means including a pilot-exhaust valve for each blastvalve means, whereby separation of the movable contact structure and actuation of the pilot-exhaust valve means permits a flow of high-pressure gas to blast between the separable contact structure for areextinguishing purposes.
  • a rotatable hollow tubular operating rod extends upwardly through the insulating supporting column, a pair of reservoir chambers are disposed adjacent the inner ends of the pair of terminal bushings, and a generally Y-shaped supply pipe being in fluid communication with the aforesaid supply tube, and synchronizing means are provided for synchronizing opening of the separable contact structure and opening of the blastvalve means for the purpose of supplying a highpressure blast of gas at the are established in each arcextinguishing unit.
  • a high-voltage compressed-gas circuit interrupter including a base, an insulating column extending upwardly from said base and supporting a live metallic tank at the upper end thereof, a pair of terminal bushings extending into said live metallic tank and carrying a pair of arc-extinguishing units and a pair of highpressure gas reservoirs at the interior ends thereof, separable contact structure and blast-valve means associated with each arc-extinguishing unit, a generally horizontally extending conducting plate structure secured to the inner walls of said live metallic tank and having sliding contact fingers associated therewith, the movable contact of each arc-extinguishing unit making sliding engagement with said sliding contact fingers, whereby said horizontally extending conducting plate structure causes the transmission of current flow between the two arc-extinguishing units.
  • a rotatable insulating operating tube extends upwardly through the insulating column and has cam means disposed at the upper end thereof for actuation of the pilot-exhaust valve means.
  • a high-voltage compressed-gas circuit interrupter including an upstanding insulating supporting column, a live metallic tank surmounted upon said insulating column and having a pair of terminal bushings extending therewithin, a pair of arc extinguishing units and a pair of high-pressure gas-reservoir chambers disposed at the interior ends of said pair of terminal bushings, a pair of separable contacts and piston-actuated blast-valve means associated with each arc-extinguishing units, and pilot exhaust valve means associated with each unit and simultaneously actuated for effecting a blast of high-pressure gas at the established arcs.
  • each terminal bushing is tubular and provides gas communication with the respective high-pressure reservoir chamber.
  • a high-voltage compressed-gas circuit interrupter including an upstanding insulating column, a live metallic tank surmounted upon said column and having a pair of terminal bushings extending therewithin, each terminal bushing having a tubular terminal stud in gas communication with a supported high-pressure gas reservoir tank disposed at the interior end of each terminal bushing, each terminal bushing supporting an arc-extinguishing unit including separable contact structure, blast-valve means associated with each high-pressure gas reservoir, and means actuating the blast-valve structure in accordance with opening movement of the movable contact structure, whereby a blast of high-pressure gas is caused to flow toward the established arcing.

Landscapes

  • Circuit Breakers (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US00240144A 1972-03-31 1972-03-31 Compressed-gas circuit interrupter Expired - Lifetime US3846601A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US00240144A US3846601A (en) 1972-03-31 1972-03-31 Compressed-gas circuit interrupter
AU51652/73A AU5165273A (en) 1972-03-31 1973-02-01 Improved compressed-gas circuit interrupter
CA162,956A CA977807A (en) 1972-03-31 1973-02-06 Compressed-gas circuit interrupter
ES412368A ES412368A1 (es) 1972-03-31 1973-03-06 Un dispositivo interruptor de circuito de gas comprimido.
JP48028104A JPS498769A (it) 1972-03-31 1973-03-12
DE19732314057 DE2314057A1 (de) 1972-03-31 1973-03-19 Druckgasschalter
GB1331073A GB1422997A (en) 1972-03-31 1973-03-20 Compressed-gas circuit interrupter
NL7304303A NL7304303A (it) 1972-03-31 1973-03-28
FR7311123A FR2178911B1 (it) 1972-03-31 1973-03-28
CH452273A CH547545A (de) 1972-03-31 1973-03-29 Druckgasschalter.
IT22405/73A IT981794B (it) 1972-03-31 1973-03-30 Interruttore di circuito a gas compresso
BE1004932A BE797555A (fr) 1972-03-31 1973-03-30 Interrupteur de circuit perfectionne a gaz comprime
SE7304641A SE388306B (sv) 1972-03-31 1973-04-02 Tryckgasbrytare
JP1981167157U JPS57109543U (it) 1972-03-31 1981-11-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00240144A US3846601A (en) 1972-03-31 1972-03-31 Compressed-gas circuit interrupter

Publications (1)

Publication Number Publication Date
US3846601A true US3846601A (en) 1974-11-05

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ID=22905289

Family Applications (1)

Application Number Title Priority Date Filing Date
US00240144A Expired - Lifetime US3846601A (en) 1972-03-31 1972-03-31 Compressed-gas circuit interrupter

Country Status (13)

Country Link
US (1) US3846601A (it)
JP (2) JPS498769A (it)
AU (1) AU5165273A (it)
BE (1) BE797555A (it)
CA (1) CA977807A (it)
CH (1) CH547545A (it)
DE (1) DE2314057A1 (it)
ES (1) ES412368A1 (it)
FR (1) FR2178911B1 (it)
GB (1) GB1422997A (it)
IT (1) IT981794B (it)
NL (1) NL7304303A (it)
SE (1) SE388306B (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006332A (en) * 1974-11-11 1977-02-01 Westinghouse Electric Corporation Convection heating apparatus for multi-phase gas-type circuit interrupters
US4109124A (en) * 1975-04-07 1978-08-22 Coq B.V. Circuit-breakers for high voltages
US4293747A (en) * 1976-08-11 1981-10-06 Westinghouse Electric Corp. High-voltage puffer-type compressed-gas circuit-interrupter assemblage
US4295023A (en) * 1979-06-13 1981-10-13 Delle-Alsthom Gas-blast circuit-breaker
US5534673A (en) * 1993-06-04 1996-07-09 Siemens Aktiengesellschaft Electric high-voltage circuit breaker
US20120120537A1 (en) * 2010-11-15 2012-05-17 American Superconductor Corporation Current fault limiter with live tank
US9987052B2 (en) 2015-02-24 2018-06-05 X-Spine Systems, Inc. Modular interspinous fixation system with threaded component

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS556500A (en) * 1979-07-09 1980-01-17 Seiko Instr & Electronics Ltd Rare earths-cobalt magnet

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205321A (en) * 1938-05-19 1940-06-18 Gen Electric Electric circuit breaker
US2824937A (en) * 1954-12-30 1958-02-25 Westinghouse Electric Corp Circuit interrupters
US3045086A (en) * 1959-11-10 1962-07-17 Westinghouse Electric Corp Circuit interrupters
US3356809A (en) * 1964-06-08 1967-12-05 Westinghouse Electric Corp Multi-break compressed-gas circuit interrupters with rotating gasconducting bridging members
US3538281A (en) * 1966-12-02 1970-11-03 Westinghouse Electric Corp Compressed-gas circuit interrupter with cylindrical high pressure tank supporting a spherical exhaust tank

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129309A (en) * 1960-04-12 1964-04-14 Westinghouse Canada Ltd Temperature-compensated pressure switches for controlling gas blast circuit interrupters
US3189718A (en) * 1961-08-16 1965-06-15 Mitsubishi Electric Corp Compressed-gas circuit interrupter with hydraulic operating means extending upwardly through supporting insulating column means
BE623579A (it) * 1961-10-12
US3244844A (en) * 1962-12-24 1966-04-05 Ite Circuit Breaker Ltd Energy storage operating means for air blast circuit breakers
FR1037497A (fr) * 1964-05-29 1953-09-17 Alsthom Cgee Perfectionnements apportés aux interrupteurs à soufflage de l'arc par courant de gaz comprimé
JPS4531494Y1 (it) * 1969-01-21 1970-12-03

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205321A (en) * 1938-05-19 1940-06-18 Gen Electric Electric circuit breaker
US2824937A (en) * 1954-12-30 1958-02-25 Westinghouse Electric Corp Circuit interrupters
US3045086A (en) * 1959-11-10 1962-07-17 Westinghouse Electric Corp Circuit interrupters
US3356809A (en) * 1964-06-08 1967-12-05 Westinghouse Electric Corp Multi-break compressed-gas circuit interrupters with rotating gasconducting bridging members
US3538281A (en) * 1966-12-02 1970-11-03 Westinghouse Electric Corp Compressed-gas circuit interrupter with cylindrical high pressure tank supporting a spherical exhaust tank

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006332A (en) * 1974-11-11 1977-02-01 Westinghouse Electric Corporation Convection heating apparatus for multi-phase gas-type circuit interrupters
US4109124A (en) * 1975-04-07 1978-08-22 Coq B.V. Circuit-breakers for high voltages
US4293747A (en) * 1976-08-11 1981-10-06 Westinghouse Electric Corp. High-voltage puffer-type compressed-gas circuit-interrupter assemblage
US4295023A (en) * 1979-06-13 1981-10-13 Delle-Alsthom Gas-blast circuit-breaker
US5534673A (en) * 1993-06-04 1996-07-09 Siemens Aktiengesellschaft Electric high-voltage circuit breaker
US20120120537A1 (en) * 2010-11-15 2012-05-17 American Superconductor Corporation Current fault limiter with live tank
US9987052B2 (en) 2015-02-24 2018-06-05 X-Spine Systems, Inc. Modular interspinous fixation system with threaded component

Also Published As

Publication number Publication date
FR2178911B1 (it) 1978-04-28
CA977807A (en) 1975-11-11
JPS498769A (it) 1974-01-25
BE797555A (fr) 1973-10-01
ES412368A1 (es) 1976-01-01
FR2178911A1 (it) 1973-11-16
AU5165273A (en) 1974-08-01
IT981794B (it) 1974-10-10
DE2314057A1 (de) 1973-10-11
GB1422997A (en) 1976-01-28
NL7304303A (it) 1973-10-02
SE388306B (sv) 1976-09-27
CH547545A (de) 1974-03-29
JPS57109543U (it) 1982-07-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ABB POWER T&D COMPANY, INC., A DE CORP., PENNSYLV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.;REEL/FRAME:005368/0692

Effective date: 19891229