EP2596513B1 - Pressure propelled contact system for gas circuit breaker interrupter - Google Patents

Pressure propelled contact system for gas circuit breaker interrupter Download PDF

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Publication number
EP2596513B1
EP2596513B1 EP11746673.0A EP11746673A EP2596513B1 EP 2596513 B1 EP2596513 B1 EP 2596513B1 EP 11746673 A EP11746673 A EP 11746673A EP 2596513 B1 EP2596513 B1 EP 2596513B1
Authority
EP
European Patent Office
Prior art keywords
arcing contact
contact
gas
circuit breaker
pressure
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.)
Not-in-force
Application number
EP11746673.0A
Other languages
German (de)
French (fr)
Other versions
EP2596513A1 (en
Inventor
Kumar Padhee Sanjeeb
Vinayakumar Subramanyam
Samba Murty Buddha
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.)
Bharat Heavy Electricals Ltd
Original Assignee
Bharat Heavy Electricals Ltd
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 Bharat Heavy Electricals Ltd filed Critical Bharat Heavy Electricals Ltd
Publication of EP2596513A1 publication Critical patent/EP2596513A1/en
Application granted granted Critical
Publication of EP2596513B1 publication Critical patent/EP2596513B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • 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
    • H01H33/88—Switches 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
    • 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
    • H01H33/88—Switches 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
    • H01H33/90—Switches 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
    • H01H33/904—Switches 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 characterised by the transmission between operating mechanism and piston or movable contact
    • 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
    • H01H2033/028—Details the cooperating contacts being both actuated simultaneously in opposite directions
    • 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
    • H01H33/88—Switches 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
    • H01H33/90—Switches 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
    • H01H33/901—Switches 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 making use of the energy of the arc or an auxiliary arc

Definitions

  • the present invention generally relates to a process of current interruption in a gas circuit breaker. More particularly, the present invention relates to a pressure - propelled contact system for gas circuit breaker.
  • Puffer type gas circuit breakers are employed to interrupt normal and short circuit current generated during fault conditions in a high voltage transmission system.
  • gas is stored in an enclosure at a predetermined high pressure and further compressed by a cylinder piston to a higher pressure in a compression chamber generally termed as a puffer or blast cylinder.
  • the compressed gas from the blast cylinder is discharged through an insulating nozzle at a very high velocity to blow out the high temperature arc plasma that is struck between a pair of arcing contacts.
  • the arc that is surrounded by the envelope of high pressure gas eventually gets lengthened and quenched to interrupt the flow of current.
  • Indian Patent No. 217361 disclosed a puffer type gas circuit breaker with movable piston and metallic blast cylinder in which the moving piston compresses the gas within a fixed metallic blast cylinder as opposed to the then state of art circuit breakers, wherein a moving cylinder compresses the gas against a fixed piston.
  • the gap between the two arcing contacts at the instant of current interruption is one of the factors for determining the total time required for arc extinction inside the interrupter and designated as the arcing time of the interrupter.
  • the relative speed between the contacts has to be improved by increasing the energy supplied by the operating mechanism which in turn imposes additional stresses on the operating mechanism and the movable system. The restrictions on speed thus imposed, limits the scope for achieving further reduction in the arcing time of the interrupter for a given configuration.
  • a contact system of the prior art is disclosed in DE-B-1765325 .
  • Another object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which ensures a higher relative speed between the contacts in a process of current interruption without increasing the energy input to the operating mechanism.
  • a still another object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which enables to reduce the arcing time of the GCB for a given configuration of the gas circuit-breaker.
  • Yet another object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which improves the voltage withstanding capability of the interrupter at the instant of current interruption by increasing the gap between the fixed and moving arcing contacts at a faster rate by causing a movement of the designated fixed arcing contact in a direction opposite to that of the movable arcing contact.
  • a further object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which is enabled to improve voltage withstanding capacity of the interrupter after current interruption for a given energy level of the operating mechanism.
  • a pressure - propelled contact system for gas circuit breaker comprising a movable piston in a metallic blast cylinder for interrupting high electric current; a pressure propelled fixed arcing contact means; and a movable contact means enabled to move in opposed directions.
  • the invented system is capable to achieve improved interruption and reduce the arcing time during current interruption process in a gas circuit breaker interrupter.
  • the inventive system with a dual contact movement improves the interrupting capability in terms of higher voltage with standability, lower arcing time at higher currents without any additional mechanical energy input to the operating mechanism of the Circuit breaker.
  • the prior art interrupter for gas circuit breaker comprises an insulating chamber (1); a fixed contact system (2); a moving contact system (3); a fixed contact terminal (4); a movable contact terminal (5); a fixed contact support (6); a normal current contact (7); a designated fixed arcing contact (8); a high voltage shield (9); a movable contact support (10); a metallic blast cylinder (11); a movable piston (12); an insulating nozzle (13); a moving arcing contact (14); a link to operating mechanism (15); and a movable contact tube (16).
  • the isolating gap and the corresponding volume are represented respectively by the alphabets "A" and "B" in figure 1 .
  • Gas is stored at a high pressure in the insulating chamber (1), and the gas is further compressed to higher pressure inside the metallic blast chamber (11) and the movable piston (12) effects the gas compression.
  • the insulating nozzle (13) blows the high pressure compressed gas over the high temperature arc that is stuck between the pair of designated fixed (8) and moving (14) arcing contacts.
  • circuit breakers which blow out an arc with compressed gas
  • the breaking capacity is depended on unidirectional movement of the movable contact system (3) only and such unidirectional movement limits the relative speed and the gap between both the arcing contacts which play a vital role in the process and capacity of current interruption. Interrupting capability and arc extinction can be effected more easily and quickly, if the relative speed and gap between the two arcing contacts are increased during current interruption/arc extinction.
  • Figure (3 ) shows the detailed view of the present invention showing the relative directions of movements of the designated fixed arcing contact (upward arrow) and movable arcing contact (downward arrow).
  • the designated fixed arcing contact (8) moves against a compression spring (18) due to the differential pressure developed during the current interruption process.
  • This compression spring (18) enables the designated fixed arcing contact (8) to restore to its initial position after completion of the process of current interruption or arc extinction.
  • the constituent components of the interrupter are shown in figure (2 ).
  • This additional gap enables faster building-up of dielectric across the contact gap and there by shorten the arcing time during current interruption.
  • the total fault current duration in the electrical network is reduced, improving the system reliability.

Landscapes

  • Circuit Breakers (AREA)

Description

    FIELD OF INVENTION :
  • The present invention generally relates to a process of current interruption in a gas circuit breaker. More particularly, the present invention relates to a pressure - propelled contact system for gas circuit breaker.
    • BACKGROUND OF THE INVENTION :
  • Puffer type gas circuit breakers are employed to interrupt normal and short circuit current generated during fault conditions in a high voltage transmission system. In a puffer type gas circuit breaker with insulating nozzle, gas is stored in an enclosure at a predetermined high pressure and further compressed by a cylinder piston to a higher pressure in a compression chamber generally termed as a puffer or blast cylinder. The compressed gas from the blast cylinder is discharged through an insulating nozzle at a very high velocity to blow out the high temperature arc plasma that is struck between a pair of arcing contacts. The arc that is surrounded by the envelope of high pressure gas eventually gets lengthened and quenched to interrupt the flow of current.
  • Indian Patent No. 217361 disclosed a puffer type gas circuit breaker with movable piston and metallic blast cylinder in which the moving piston compresses the gas within a fixed metallic blast cylinder as opposed to the then state of art circuit breakers, wherein a moving cylinder compresses the gas against a fixed piston.
  • In the interrupter of the gas circuit breaker disclosed in the prior patent No. 217361 during the process of current interruption formation of an insulating gap between a designated fixed arcing contact and the moving arcing contact is entirely governed by the movement of the movable arcing contact. The movable ... arcing contact is driven by a circuit breaker operating mechanism. At any instant, the speed of the movable contact for a given mass depends on the energy supplied by the operating mechanism. During the process of current interruption, the gap between the movable and fixed arcing contacts is dependent on the speed of the movable contact. At the point of current interruption, this gap plays a major role in withstanding the transient recovery voltage for a successful current interruption. Thus, the gap between the two arcing contacts at the instant of current interruption is one of the factors for determining the total time required for arc extinction inside the interrupter and designated as the arcing time of the interrupter. In order to achieve a lower arcing time, the relative speed between the contacts has to be improved by increasing the energy supplied by the operating mechanism which in turn imposes additional stresses on the operating mechanism and the movable system. The restrictions on speed thus imposed, limits the scope for achieving further reduction in the arcing time of the interrupter for a given configuration. A contact system of the prior art is disclosed in DE-B-1765325 .
    • OBJECT OF THE INVENTION :
  • It is therefore an object of the invention, to propose a pressure - propelled contact system for gas circuit breaker, during the process current interruption, which imparts movements to the designated fixed contacts which is additional to the actuation provided to the moving contact by the operating mechanism.
    Another object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which ensures a higher relative speed between the contacts in a process of current interruption without increasing the energy input to the operating mechanism.
  • A still another object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which enables to reduce the arcing time of the GCB for a given configuration of the gas circuit-breaker.
  • Yet another object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which improves the voltage withstanding capability of the interrupter at the instant of current interruption by increasing the gap between the fixed and moving arcing contacts at a faster rate by causing a movement of the designated fixed arcing contact in a direction opposite to that of the movable arcing contact.
  • A further object of the invention is to propose a pressure - propelled contact system for gas circuit breaker, which is enabled to improve voltage withstanding capacity of the interrupter after current interruption for a given energy level of the operating mechanism.
    • SUMMARY OF THE INVENTION :
  • Accordingly there is provided a pressure - propelled contact system for gas circuit breaker, comprising a movable piston in a metallic blast cylinder for interrupting high electric current; a pressure propelled fixed arcing contact means; and a movable contact means enabled to move in opposed directions. The invented system is capable to achieve improved interruption and reduce the arcing time during current interruption process in a gas circuit breaker interrupter.
  • According to the invention, a movement of the designated fixed arcing contact facilitates early expulsion of arced gas through the throat of the insulated nozzle resulting in faster current interruption.
  • An increased gap enables a higher voltage withstanding capability of the Circuit breaker interrupter during the process of current interruption.
  • The inventive system with a dual contact movement improves the interrupting capability in terms of higher voltage with standability, lower arcing time at higher currents without any additional mechanical energy input to the operating mechanism of the Circuit breaker.
    • BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS :
  • The proposed invention will be better understood from the description with reference to the accompanying drawings in which
    • Figure 1 represents a puffer interrupter for gas circuit breaker with a moving Piston, a metallic blast cylinder, and an insulating nozzle with a designated fixed arcing contact according to the prior art.
    • Figure 2 represents a puffer interrupter for gas circuit breaker with a moving piston, a metallic blast cylinder, and an insulating nozzle with a pressure propelled fixed arcing contact means in which movement of the designated fixed arcing contact is effected in a direction opposite to that of the designated movable contact by the pressure generated during the process of current interruption, according to the invention.
    • Figure 3 represents a detailed view of the pressure propelled fixed arcing contact means indicating the movement of the contact means during current interruption including the direction of movements of both the arcing contacts according to the present invention.
    • Figure 4 represents the detailed construction of the pressure propelled fixed arcing contact system according to the invention.
    DETAIL DESCRIPTION OF THE INVENTION :
  • An embodiment of the invention as depicted in the accompanying drawings will now be described. However, there can be several other embodiments of the same invention, all of which are deemed covered by this description.
  • As shown in figure 1, the prior art interrupter for gas circuit breaker comprises an insulating chamber (1); a fixed contact system (2); a moving contact system (3); a fixed contact terminal (4); a movable contact terminal (5); a fixed contact support (6); a normal current contact (7); a designated fixed arcing contact (8); a high voltage shield (9); a movable contact support (10); a metallic blast cylinder (11); a movable piston (12); an insulating nozzle (13); a moving arcing contact (14); a link to operating mechanism (15); and a movable contact tube (16). The isolating gap and the corresponding volume are represented respectively by the alphabets "A" and "B" in figure 1.
  • Gas is stored at a high pressure in the insulating chamber (1), and the gas is further compressed to higher pressure inside the metallic blast chamber (11) and the movable piston (12) effects the gas compression. The insulating nozzle (13) blows the high pressure compressed gas over the high temperature arc that is stuck between the pair of designated fixed (8) and moving (14) arcing contacts.
  • The efficiency of a gas circuit breaker depends upon how quickly the high temperature arc can be extinguished or "blown out".
  • For the prior art, circuit breakers, which blow out an arc with compressed gas, the breaking capacity is depended on unidirectional movement of the movable contact system (3) only and such unidirectional movement limits the relative speed and the gap between both the arcing contacts which play a vital role in the process and capacity of current interruption. Interrupting capability and arc extinction can be effected more easily and quickly, if the relative speed and gap between the two arcing contacts are increased during current interruption/arc extinction.
  • The present invention achieves an increase in the relative speed including an improved gap between the two arcing contacts by providing an additional movement ('E' shown in figure 3) in the designated fixed arcing contact with the help of a differential pressure generated due to the cylinder-piston action in a puffer type interrupter. Additionally, the magnitude of the differential pressure thus generated is increased due to the heat generated during the process of arc interruption, thereby further assisting the movement of the designated fixed arcing contact (8).
  • Figure (3) shows the detailed view of the present invention showing the relative directions of movements of the designated fixed arcing contact (upward arrow) and movable arcing contact (downward arrow). The designated fixed arcing contact (8) moves against a compression spring (18) due to the differential pressure developed during the current interruption process. This compression spring (18) enables the designated fixed arcing contact (8) to restore to its initial position after completion of the process of current interruption or arc extinction. The constituent components of the interrupter are shown in figure (2).
  • The improvement on the prior art of figure 1 is characterized by
    1. (a) additional movement (E) in the designated fixed arcing contact (8).
    2. (b) a compression spring (18) fitted in the designated fixed arcing contact (8) as shown in figure (3) to facilitate the additional movement and improve the relative speed between the two arcing contacts (8 & 14) without any physical coupling to the movable contact system.
  • This additional gap enables faster building-up of dielectric across the contact gap and there by shorten the arcing time during current interruption. Thus by providing the designated pressure propelled fixed arcing contact system, the total fault current duration in the electrical network is reduced, improving the system reliability.

Claims (3)

  1. A pressure-propelled contact system for gas circuit breaker (GCB) interrupter, comprising:
    an insulating chamber (1) for storage of gas;
    a pressure-propelled fixed arcing contact (8) and a moveable arcing contact (14); a compression spring (18) configured to restore the fixed arcing contact (8) to its initial position after a process of current interruption, characterised in that it further comprises:
    a metallic blast cylinder (11) having a moveable piston (12) configured to pressurise gas supplied from the insulating chamber;
    an insulating nozzle (13) configured to blow the pressurised gas over an arc formed between the fixed arcing contact (8) and the moveable arcing contact (14);
    wherein movement of the fixed arcing contact (8) is configured to be effected by a discharge of pressurised gas from the metallic blast cylinder (11) during a process of current interruption, in a direction opposite to that of the moveable arcing contact (14) and against the compression spring (18).
  2. The system according to claim 1, wherein the movement of the fixed arcing contact (8) facilitates expulsion of arced gas through the insulating nozzle (13).
  3. The system according to claim 1, wherein the movement of the fixed arcing contact (8) is effected by discharge of pressurised gas from the metallic blast cylinder (11), during a process of current interruption, only.
EP11746673.0A 2010-07-20 2011-05-20 Pressure propelled contact system for gas circuit breaker interrupter Not-in-force EP2596513B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN790KO2010 2010-07-20
PCT/IN2011/000353 WO2012011119A1 (en) 2010-07-20 2011-05-20 Pressure propelled contact system for gas circuit breaker interrupter

Publications (2)

Publication Number Publication Date
EP2596513A1 EP2596513A1 (en) 2013-05-29
EP2596513B1 true EP2596513B1 (en) 2018-02-14

Family

ID=44504052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11746673.0A Not-in-force EP2596513B1 (en) 2010-07-20 2011-05-20 Pressure propelled contact system for gas circuit breaker interrupter

Country Status (2)

Country Link
EP (1) EP2596513B1 (en)
WO (1) WO2012011119A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2582307A (en) 2019-03-18 2020-09-23 Eaton Intelligent Power Ltd Switching device for fast disconnection of short-circuit currents
CN113330529B (en) * 2019-03-19 2024-04-02 株式会社东芝 Gas circuit breaker
EP4024425A1 (en) * 2020-12-28 2022-07-06 Fritz Driescher KG Spezialfabrik für Elektrizitätswerksbedarf GmbH & Co. Switching device with movable nozzle element

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946236A (en) * 1960-05-06 1964-01-08 Reyrolle A & Co Ltd Improvements in or relating to high-voltage gas-blast electric circuit-breakers
DE1765325B1 (en) * 1967-04-14 1973-02-15 Coq Nv Compressed gas switch
CH524887A (en) * 1970-12-14 1972-06-30 Bbc Brown Boveri & Cie Electric compression switch
FR2743936B1 (en) * 1996-01-22 1998-02-20 Gec Alsthom T & D Sa CIRCUIT BREAKER WITH DOUBLE MOTION OF CONTACTS

Also Published As

Publication number Publication date
EP2596513A1 (en) 2013-05-29
WO2012011119A1 (en) 2012-01-26

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