PL113528B1 - Circuit breaker operating in an inert gas - Google Patents

Circuit breaker operating in an inert gas Download PDF

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Publication number
PL113528B1
PL113528B1 PL17903475A PL17903475A PL113528B1 PL 113528 B1 PL113528 B1 PL 113528B1 PL 17903475 A PL17903475 A PL 17903475A PL 17903475 A PL17903475 A PL 17903475A PL 113528 B1 PL113528 B1 PL 113528B1
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PL
Poland
Prior art keywords
insulating
circuit breaker
shell
reinforcement elements
insulation shell
Prior art date
Application number
PL17903475A
Other languages
Polish (pl)
Original Assignee
Electro Mecanique Ciefr
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 Electro Mecanique Ciefr filed Critical Electro Mecanique Ciefr
Publication of PL113528B1 publication Critical patent/PL113528B1/en

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52Cooling of switch parts
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/24Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52Cooling of switch parts
    • H01H2009/526Cooling of switch parts of the high voltage switches
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H2033/888Deflection of hot gasses and arcing products

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Gas-Insulated Switchgears (AREA)

Description

Opis patentowy opublikowano: 15.05.1982 113528 Int. Cl.* H01H 33/74 Twórca wynalazku Uprawniony z patentu: BBC Aktiengesellschaft Brown, Boveri and Cie, Baden (Szwajcaria) Wylacznik pi-zerywajacy w gazie izolujacym Przedimioteim wynailaizfcu j-estt wylacznik przery¬ wajacy w gazie izolujacym.Ziname sa wylaczniki wielofazowe o biegunach niezaleznych lub grupowanych w jeden blok, u- mieszczone w oslonach izolacyjnych, wykonanych z materialu nieprzewodzacego prajdu elektryczne¬ go, i których tnzony przepustów, sluzace jako do¬ prowadzenia praldowe, sa zatopione w tyim ma¬ teriale, dla zapeiwnieniiia szczelnosci ioh osadzenia bez potrzeby stosowania dodatkowych dlawnfic.Obecnosc przepustów dla wejscia i wyfjscia pra- diu w dwóch punktach korpusu kazdego bieguna stanowi szczególne punkty ze wizglejdu na rozklad pola elektrycznego wawnaltrz koirpulsów jedno- i wielofazowych wylacznika przerywajacego. Jed¬ noczesnie produkty roizlkiadiu gazu elektiroujeni- nego pod dziialanieim lulku elektrycznego, aczkol¬ wiek wystepuja w niewielkiej ilosci, a material oslon izolacyjnych jest bairdizo odpoirny na koro¬ zje, maja minio wszystko sklonnosc do atakowa¬ nia go, zwlaszcza w miejscu gdzie gazy sa cieplej¬ sze, a ponadto gazy maja tendencje do przenika¬ nia popirzez izolujace czesci oislony. Ponaldito, nie¬ równosci temperatury oislony izolujacej przy se¬ rii wylaczen moga spowodowac naprezenia me¬ chaniczne w tej oslonie i w konsekwencji peknie¬ cia szkodliwe dla utrzymania szozeJLnóisci.Celem wynalazku jest zlagodzenie tych niedo¬ godnosci, zas zadaniem wynalazku jest opracowa¬ lo 15 20 25 30 nie konstrukcji wylacznika przerywajacego w ga-* ztie izolujacym, w którym mozliwe byloby uzy¬ skanie jak najlepszego rozkladu temperatur na jego oslonie izolujacej- przy maksymalnie duzej powierzchni izolujacej, oraz stworzenie mozliwo¬ sci ujednioiroidnienia gradientów pola elejktryczne- go.Wylacznik przerywajacy w gazie izolujacym,* majacy oslone izolacyjna otaczajaca zestyki pra¬ dowe podtrzymywane przez przepusty dla wej¬ scia i wyjscia pradiu, utwierdzone w tej oslonie izolacyjnej, charakteryzuje sie zgodnie z wyna¬ lazkiem tym, ze przepusty sa polaczone z metalo¬ wymi elementami wzmacniajacymi, pokrywajacy¬ mi czesc wewnetrznej powierzchni oslony izola¬ cyjnej.Jeden z elementów wzmacniajacych ma postac kubka z wkleslym od wewnatrz dnem, pokrywa¬ jacym dno oslony izolacyjnej, przy czym ten ele¬ ment wzmacniajacy jest zaopatrzony w wystep, usytuowany na wewnejtrznej powtazchmi dna kub¬ ka.Element wzmacniajacy, najbardziej oddalony od dna oslony izolacyjnej, ma poistac odcinka scianki cylindrycznej. Korzystnie, elementy wzmacniajace maja krawedzie odgiejte ku wne¬ trzu oslony izolacyjnej i znajdujace sie w od¬ stepie od wewnejtrznej powierzchni tej oslony izo¬ lacyjnej. 113 528i na 3 .Elementy wzmacniajace, poikrywajace zgodnie z wynalazkiem czesc wewnetrznej powierzchni oslo- ny izolacyjnej, spelniaja fuinikcje chlodnic, rozdzie¬ laczy temperatury, pierscieni rozdzielajacych po¬ le elektrycznie, ekranów zabezpieczajacych przed 5 koiroizja i przenikaniem na zewnatrz oislony ^gazu izolujacego. iPrzedmiot wynailazlku ' zostanie blizej objasnio- " ny w przykladach uwidocznlionych na rysunku, na którym fig. 1 przedstawia fragment wylacznika 10 przerywajacego w przekroju poprzecznym, fig. 2 — fragment wylacznika w drugim wy/konaniu, równiez w przekroju poiprzecznym, zas fig. 3 przedstawia fragment wylacznika w trzecim wy¬ konaniu, w przekroju poprzecznym. 15 Oslona izolacyjna 1 wylacznika, przymocowana do obudowy 6 mechanizmu sterujacego, zostala odlana w formie, w której przed wlaniem ma¬ terialu przeznaczonego na te oislone umieszczono przepusty 4, 4' wraz. z elementami wizmacniaja- 20 cymi 2, 3, podrywajacymi znaczna czesc we¬ wnetrznej powierzclhni 5 oslony izolacyjnej 1.. Element wzmacniajacy 2, majacy pólstac odcinka scianki cylindrycznej wykonanej z meitaihi, jest umlieszczony w tej strefie wylacznika, gdzie prze- 25 - noiszone sa gazy o stosunkowo niskiej tempera¬ turze. Dzieki temu ksztaltowi elementu wzmac¬ niajacego 2, naprezenia w oslonie izolacyjnej 1," a zwlaszcza na jej wewnetrznej powierzchni wzgledem masy, która stanowi obudowa 6 me- 30 chanizmu • sterujacego, oiraz wizglledeni drugiej e- lektrody utworzonej przez dirugii element wzmac¬ niajacy 3, gdy wylacznik znajduje sie w stanie otwarcia, sa utrzymywane na dopuszczalnym po¬ ziomie. Ponadto, element wzmacniajacy 2 sluzy 35 do podtrzymywania zestyków pradowych 8.Natomiast element wzmacniajacy 3, majacy po¬ stac kubka wytloczonego z blachy, pokrywa oslo¬ de izolacyjna 1 na calej jej górnej wewnetrznej powierzchni 5, chironliac te czesc powierzchni 40 przed dzialaniem gazów o stosunkowo wysolkiej temperaturze. Dno tego elememltu wzmacnia!jacego- go 3 jest wlklesle od wewnatrz, przez co ulatwio¬ ny jest rozdzial cismien gazu. Ponadlto, ksztaUt e- lemientu wzmacniajacego 3 powoduje, ze wykazu- 45 je on wlasciwosci chlodnicy, przejawiajace sie od- prowaidzaniem ciepla nagromaidzonego w gazach, które to odprowadzanie przebiega bez trudnosci W atmosfere poprzez oslone izolacyjna 1, przy 4 czym grubosc scianki tego elementu wzmacniaja-* cego jest dostateczna alby moglo nastepowac wy¬ równywanie temperatur we wnetrzu oslony izo¬ lacyjnej 1 i na zewnatrz niej.Elementy wzmacniajace 2, 3 sa wyikonane z me¬ talu bedacego dobrym przewodnikiem ciepla, na przyklad z miedzi. Kiraiwedz dolna elementu wlzmacniajacego 3, podobnie jak i obie krajwejdzde elementu wzmacniajacego 2, jak to pokazano na fiig. 2, jest odgieta do wnejtrza oslony izolacyjnej 1, co w korzystny sposób pozwala na dalsze zmniejszenie naprezen w materiale oslony izola¬ cyjnej jak i na jej wewnetrznej powierzchni 5, gdy wylacznik znajduje sie w stanie otwaircia.Element wzmacniajacy 3 sluzy równiez do pod¬ trzymywania ramion 10 zestyków pradowych 9.Zgodnie z fig. 3 element wzmacniajacy 3 na wewnetrznej powierzchni siwego dna jest zaopa¬ trzony w centralnie usytuowany wystep T, w po¬ staci garbu, który podwala na lepsze rozdzielenie strumienia gazu wewnatrz oslony izolacyjnej 1..Zastrzezenia p a te n t ol we 1. Wylacznik przerywajacy w gazie izolujacym, majacy oslone izolacyjna otaczajaca zestylki pra¬ dowe podtrzymywane przez .przepusty dla wejiscia i, wyjscia pradu, utwierdzone w tej oslonie izola¬ cyjnej, znamienny tym, ze przeipusity (4, 4') sa polaczone z metalowymi elementami wzmacniaja¬ cymi (2, 3), pokrywajacymi czesc wewnejtnznej powierzchni (5) oslony izolacyjnej (1). 2. Wylacznik wedlug zastrz. 1, znamienny tym, ze jeden z elementów wzmacniajacych (3) ma po¬ stac kubka z wkleslym od wewnatrz dnem, po¬ krywajacym dno oslony izolacyjnej (1). 3. Wylacznik wedlug zastrz. 2, znamienny tym, ze element wzmacniajacy (3) jest zaoipaltaizony w wystep (7), usytuowany na wewnetrznej powierz¬ chni dna kubka stanowiacego ten element. 4. Wytfacznilk wedlug zastirz. 1, znamienny tym, ze element wzmacniajacy (2), najbardziej odda¬ lony od dna oslony izolacyjnej (1), ma postac odcinka scianki cylindrycznej. 5. Wylacznik wedlug zastrz. 2 ailbo 4, znamien¬ ny tym, ze elementy wzmacniajace (2, 3) maja krawedzie' odgiejte ku wnetrzu oslony izolacyjnej (1) i znajdujace sie w odstejpie od wewnetrznej powierzchni (5) tej oslony izolacyjnej* 113 528 Fig.1 Fig.2 3-i Fig.3 PLThe patent description was published: May 15, 1982 113528 Int. Cl. * H01H 33/74 Inventor Proprietor of the invention Patent proprietor: BBC Aktiengesellschaft Brown, Boveri and Cie, Baden (Switzerland) Circuit breaker in insulating gas Przedimioteim manufactured j-estt circuit breaker insulating gas. Ziname are multi-phase circuit breakers with independent poles or grouped into one block, housed in insulating shells made of a non-conductive material, and whose cut-outs, serving as power leads, are embedded in this Materials for sealing and sealing without the need for additional glands. The presence of bushings for the input and output of the current at two points of the body of each pole are special points from the view of the distribution of the electric field inside the single- and multi-phase coirps of the breaking circuit breaker. At the same time, the products of electro-ionized gas roasting under the action of an electric powder, although they are present in a small amount, and the material of the insulating sheaths is resistant to corrodes, have passed away all the tendency to attack it, especially in the place where the gases are present. warmer, and in addition, gases tend to penetrate through the insulating parts of the screen. Ponaldito, inequalities in the temperature of the insulating shell in a series of shutdowns can cause mechanical stresses in the shell and consequently fractures detrimental to the maintenance of sixtyness. The purpose of the invention is to alleviate these deficiencies, and the invention is intended to elaborate on The construction of a breaking circuit breaker in an insulating tube, in which it would be possible to obtain the best possible temperature distribution on its insulating sheath - with a maximum insulating surface, and to create the possibility of unifying the electric field gradients. insulating gas, having an insulating sheath surrounding the current contacts supported by current input and output bushings fixed in this insulating sheath, is characterized, according to the invention, in that the bushings are connected to metal reinforcing elements covering ¬ and part of the inner surface of the insulating jacket. One element the reinforcement elements are in the form of a cup with a concave bottom on the inside covering the bottom of the insulating shell, the reinforcement element being provided with a projection on the inner surface of the bottom of the cup. The reinforcing element furthest from the bottom of the insulating shell has form of a section of a cylindrical wall. Preferably, the reinforcement elements have edges bent towards the inside of the insulation shell and spaced from the inner surface of the insulation shell. 113 528i to 3. Strengthening elements, according to the invention, covering a part of the inner surface of the insulating sheath, fulfill the functions of coolers, temperature distributors, electrically separating rings, screens protecting against coirition and the penetration of insulating gas into the external environment. The subject of the display will be explained in more detail in the examples shown in the drawing, in which Fig. 1 shows a fragment of the interrupting switch 10 in a cross-section, Fig. 2 - a fragment of a switch in a second version, also in a cross-section, and Fig. 3 shows a fragment of a switch in a third embodiment, in cross-section: The insulating casing 1 of the switch, attached to the housing 6 of the control mechanism, has been cast in a mold in which the bushings 4, 4 'are placed together before pouring the material intended for the insulation. with reinforcement elements 2, 3 tearing up a large part of the inner surface 5 of the insulation shell 1. The reinforcement element 2, having a half-length section of a cylindrical wall made of meitaihi, is located in the zone of the switch where they are insulated gases of relatively low temperature. Due to this shape of the reinforcing element 2, the stresses in the insulating sheath 1, "and in particular on its inner surface with respect to the mass which constitutes the housing 6 of the control mechanism, and the sight of the second electrode formed by the second amplifying element 3, when the switch is open, are kept at an acceptable level. In addition, the reinforcing element 2 serves to support the current contacts 8, while the reinforcing element 3, in the form of a cup pressed from sheet metal, covers the entire upper inner surface 5 of the insulation plate 1, thus cleaning this part of the surface 40 against the action of relatively high temperature. The bottom of this reinforcing element 3 is concave on the inside, which facilitates the separation of the shadows of the gas. Moreover, the shape of the reinforcing element 3 causes that it exhibits the properties of the cooler, manifested in the dissipation of heat accumulated in the gases, which discharge runs smoothly into the atmosphere through the insulating sheath 1, while the wall thickness of this element strengthens The reinforcement elements 2, 3 are made of a metal which is a good conductor of heat, for example copper, for the temperature inside and outside of the insulating sheath 1 to be equalized. The lower part of the gain element 3, as well as both sides, will go to the reinforcement element 2, as shown in Fig. 2, is bent towards the inside of the insulating casing 1, which advantageously allows a further reduction of the stresses in the material of the insulating casing and on its inner surface 5 when the circuit breaker is open. The reinforcement element 3 also serves to support of the arms 10 of the current contacts 9. According to FIG. 3, the reinforcing element 3 on the inner surface of the gray bottom is provided with a centrally located projection T, in the form of a hump, which tends to separate the gas stream inside the insulating casing 1 for better separation. This insulating gas circuit breaker has an insulating sheath surrounding the power plugs supported by conduits for the current inlet and outlet, fixed in the insulating sheath, characterized in that it is broken (4, 4 ') they are connected to the metal reinforcement elements (2, 3) which cover part of the inner surface (5) of the insulation shell (1). 2. The circuit breaker according to claim The method of claim 1, characterized in that one of the reinforcement elements (3) is in the form of a cup with a concave bottom on the inside that covers the bottom of the insulating shell (1). 3. Circuit breaker according to claim A method according to claim 2, characterized in that the reinforcing element (3) is lined with a projection (7) located on the inner surface of the bottom of the cup constituting the element. 4. Extract according to the provisions. The method of claim 1, characterized in that the reinforcing element (2), furthest away from the bottom of the insulating shell (1), is in the form of a section of a cylindrical wall. 5. Switch according to claim 2 or 4, characterized in that the reinforcement elements (2, 3) have edges' bent towards the inside of the insulation shell (1) and at a distance from the interior surface (5) of the insulation shell (1) 113 528 Fig. 1 2 3-i Fig. 3 GB

Claims (5)

Zastrzezenia p a te n t ol we 1. Wylacznik przerywajacy w gazie izolujacym, majacy oslone izolacyjna otaczajaca zestylki pra¬ dowe podtrzymywane przez .przepusty dla wejiscia i, wyjscia pradu, utwierdzone w tej oslonie izola¬ cyjnej, znamienny tym, ze przeipusity (4, 4') sa polaczone z metalowymi elementami wzmacniaja¬ cymi (2, 3), pokrywajacymi czesc wewnejtnznej powierzchni (5) oslony izolacyjnej (1).Claims in the insulating gas 1. A circuit breaker in an insulating gas having an insulating sheath surrounding the power plugs supported by conduits for the current input and output, fixed in the insulating sheath, characterized in that it is broken (4, 4). ') are connected to the metal reinforcement elements (2, 3) covering part of the inner surface (5) of the insulation shell (1). 2. Wylacznik wedlug zastrz. 1, znamienny tym, ze jeden z elementów wzmacniajacych (3) ma po¬ stac kubka z wkleslym od wewnatrz dnem, po¬ krywajacym dno oslony izolacyjnej (1).2. The circuit breaker according to claim The method of claim 1, characterized in that one of the reinforcement elements (3) is in the form of a cup with a concave bottom on the inside that covers the bottom of the insulating shell (1). 3. Wylacznik wedlug zastrz. 2, znamienny tym, ze element wzmacniajacy (3) jest zaoipaltaizony w wystep (7), usytuowany na wewnetrznej powierz¬ chni dna kubka stanowiacego ten element.3. Circuit breaker according to claim A method according to claim 2, characterized in that the reinforcing element (3) is lined with a projection (7) located on the inner surface of the bottom of the cup constituting the element. 4. Wytfacznilk wedlug zastirz. 1, znamienny tym, ze element wzmacniajacy (2), najbardziej odda¬ lony od dna oslony izolacyjnej (1), ma postac odcinka scianki cylindrycznej.4. Extract according to the provisions. The method of claim 1, characterized in that the reinforcing element (2), furthest away from the bottom of the insulating shell (1), is in the form of a section of a cylindrical wall. 5. Wylacznik wedlug zastrz. 2 ailbo 4, znamien¬ ny tym, ze elementy wzmacniajace (2, 3) maja krawedzie' odgiejte ku wnetrzu oslony izolacyjnej (1) i znajdujace sie w odstejpie od wewnetrznej powierzchni (5) tej oslony izolacyjnej* 113 528 Fig.1 Fig.2 3-i Fig.3 PL5. Switch according to claim 2 or 4, characterized in that the reinforcement elements (2, 3) have edges' bent towards the inside of the insulation shell (1) and at a distance from the interior surface (5) of the insulation shell (1) 113 528 Fig. 1 2 3-i Fig. 3 GB
PL17903475A 1974-03-27 1975-03-25 Circuit breaker operating in an inert gas PL113528B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7410518A FR2266285A1 (en) 1974-03-27 1974-03-27 Insulating gas contg. cct. breaker - has polyphase insulating casing with embedded current lead bolts coupled to casing metal lining

Publications (1)

Publication Number Publication Date
PL113528B1 true PL113528B1 (en) 1980-12-31

Family

ID=9136884

Family Applications (1)

Application Number Title Priority Date Filing Date
PL17903475A PL113528B1 (en) 1974-03-27 1975-03-25 Circuit breaker operating in an inert gas

Country Status (5)

Country Link
DE (2) DE2507163A1 (en)
FR (1) FR2266285A1 (en)
HU (1) HU170789B (en)
NL (1) NL7503597A (en)
PL (1) PL113528B1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH649416A5 (en) * 1980-01-25 1985-05-15 Sprecher & Schuh Ag EXHAUST GAS SWITCH.
CH653801A5 (en) * 1981-04-06 1986-01-15 Sprecher & Schuh Ag ENCLOSED, HIGH VOLTAGE SWITCH CONTAINING INSULATING GAS.
EP0075668B1 (en) * 1981-09-30 1987-01-07 Sprecher Energie AG Compressed-gas circuit breaker
FR2542142B1 (en) * 1983-03-02 1987-02-20 Merlin Gerin SWITCH OR CIRCUIT BREAKER WITH IMPROVED CLAMPING CLAMPS
SE448793B (en) * 1983-10-17 1987-03-16 Asea Ab gas blast
KR910003436B1 (en) * 1987-10-05 1991-05-31 미쓰비시전기 주식회사 Arc-extinguishing of switch
CH683043A5 (en) * 1992-02-06 1993-12-31 Sprecher Energie Ag Encapsulated, high pressure gas switch for circuit breaker - has first switch element part fixed to movable switch contact piece via insulated support on metal cover
DE4435358C2 (en) * 1994-09-20 2003-05-08 Siemens Ag Pole column of a high-voltage circuit breaker
ATE389943T1 (en) 2004-12-24 2008-04-15 Abb Technology Ag GENERATOR SWITCH WITH IMPROVED SWITCHING PERFORMANCE

Also Published As

Publication number Publication date
HU170789B (en) 1977-09-28
NL7503597A (en) 1975-09-30
DE7505126U (en) 1976-02-05
FR2266285A1 (en) 1975-10-24
DE2507163A1 (en) 1975-10-09
FR2266285B1 (en) 1978-07-07

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