EP0374384A2 - Interrupteur monopression à SF6 - Google Patents

Interrupteur monopression à SF6 Download PDF

Info

Publication number
EP0374384A2
EP0374384A2 EP89117724A EP89117724A EP0374384A2 EP 0374384 A2 EP0374384 A2 EP 0374384A2 EP 89117724 A EP89117724 A EP 89117724A EP 89117724 A EP89117724 A EP 89117724A EP 0374384 A2 EP0374384 A2 EP 0374384A2
Authority
EP
European Patent Office
Prior art keywords
opening
gas
switch
drive rod
switching
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.)
Granted
Application number
EP89117724A
Other languages
German (de)
English (en)
Other versions
EP0374384A3 (fr
EP0374384B1 (fr
Inventor
Herbert Dr.-Ing. Karrenbauer
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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
Priority claimed from DE19883843406 external-priority patent/DE3843406A1/de
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0374384A2 publication Critical patent/EP0374384A2/fr
Publication of EP0374384A3 publication Critical patent/EP0374384A3/fr
Application granted granted Critical
Publication of EP0374384B1 publication Critical patent/EP0374384B1/fr
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
    • H01H33/70—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
    • 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
    • H01H2033/908—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 using valves for regulating communication between, e.g. arc space, hot volume, compression volume, surrounding volume

Definitions

  • an SF6 impression switch with a switching chamber filled with insulating gas, at least two switching pieces, at least one of which is movable by a drive rod, a compression device for the insulating gas which can be actuated by this switching movement and whose compression space is delimited by two opposite floors which can be moved relative to one another , in which a pressure chamber is arranged between the insulating material nozzle and the bottom facing it, which has an outflow opening that can be closed by a non-return valve in the direction of the switching path, and an inflow opening that can be closed by means of a closing element is arranged in the bottom and a gas storage space connected to the switching path is located extends to an opening which can be closed by means of the closure member and which opens into the part of the pressure chamber which faces away from the outflow opening, in a first position of the closure member the inflow opening is open and the opening is closed and in a second position of the closure member the inflow opening is closed and the opening is open and the change in position of the closure member is
  • the invention is therefore based on the object of improving the subject matter of the main application in such a way that blowing with cold insulating gas of high density is ensured in all conceivable switching situations.
  • a ventilation opening with a valve is arranged between the compression space and the pressure chamber and in that the valve and the check valve are open when the switch is switched on.
  • the advantage of the invention is that the compression device sucks in the gas in the pressure chamber each time it is switched on, as a result of which cold quenching gas is sucked in from the switching chamber surrounding the arc extinguishing device through the nozzle opening.
  • the hot, low-density gas remaining in the pressure chamber after the interruption of a short-circuit current is sucked into the compression device in this way by the subsequent switch-on process, and the cold extinguishing gas flowing in is provided in the pressure chamber for re-blowing the arc. It is harmless that the hot quenching gas is sucked into the compression chamber, since this further cools down the quenching gas and the cold quenching gas sucked into the pressure chamber flows first to the switching path and causes the arc to be extinguished there.
  • a further advantageous embodiment provides that the opening connecting the gas storage space to the pressure chamber is closed when it is switched on, so that the flow of the fresh gas drawn in is not distributed over the pressure chamber and gas storage space, but is only and more intensively flowed through the pressure chamber, since it is renewed Switching off depends on the fact that there is cold, high-density extinguishing gas and that maximum cooling has been achieved.
  • Fig. 1 shows a first embodiment, the SF6 impression switch is shown in a partial view, in which the essential parts are shown by means of a section extending to the axis of rotation.
  • This exemplary embodiment contains the parts that are customary in an SF6 impression switch: 2 switching pieces 20 and 21, which form a switching path 4 when the switch is opened.
  • 2 switching pieces 20 and 21 which form a switching path 4 when the switch is opened.
  • one contact piece 20 is fixed and the other contact piece 21 can be brought from the switch-on to the switch-off position (and vice versa) by means of a drive rod 19 by means of a drive rod 19.
  • the arc 23 which arises in the switching path 4 when it is switched off is blown by means of a compression device.
  • an insulating gas stream is directed by means of an insulating material nozzle 12 onto the arc 23 burning in the switching path 4.
  • This compression device as is usual with SF6 indentation switches, consists of a compression cylinder 17 and two trays 1 and 2, which move towards one another when switched off and thus compress the insulating gas in a compression space 11.
  • the compression cylinder 17 is connected as a fixed part to the base 2 and the base 1 with the switching piece 21 carry out the switching movement by means of the drive rod 19, the base 1 being pulled into the compression cylinder 17.
  • a pressure chamber 3 is located between the base 1 and the insulating material nozzle 12 and a gas storage space 9 is separated therefrom by a partition 25.
  • the pressure chamber 3 is provided in the direction of the switching path 4 with an outflow opening 5, in which an insulating gas heated by the arc flows in a check valve 6 is prevented.
  • the check valve 6 closes only against the force of a spring 31, the spring contacts of which are dimensioned such that the check valve 6 closes in the event of a gas pressure wave resulting from high-current arcs, but remains open when gas is drawn into the compression space 11 as a result of a switch-on.
  • the gas storage space 9 has an inlet 26 in the direction of the switching path 4 and an opening 10 which opens into the pressure chamber 3 on the side opposite the outflow opening 5.
  • the bottom 1 is provided with an inflow opening 7, which connects the compression space 11 to the pressure chamber 3.
  • a closure element 8 is arranged in the region of the opening 10 and the inflow opening 7.
  • This closure member 8 is in Fig. 1 as a sliding ring with an L-shaped Cross section formed. It can assume two positions: a first position in which the axial leg of the closure element 8 is pushed in a sealing manner in front of the opening 10 and opens the inflow opening 7. In a second position, in which the closure element 8 is located in the illustration in FIG.
  • the opening 10 is opened and the inflow opening 7 is closed by the radial leg of the closure element 8. If no pressure differences act on the closure member 8, it is held in this second position shown by a spring 24.
  • the bottom 2 is designed as a fixed component, the drive rod 19 passing through a hole in this bottom and a seal ensuring the gas tightness of this passage.
  • a vent hole 13 is arranged, which is provided with a vent valve 14, which opens against the pressure of a spring 14 '.
  • the valve 35 to 39 is configured as follows: the base 1, which separates the pressure chamber 3 from the compression space 11, is not fixedly connected to the drive rod 19, but is displaceably mounted on it to a slight extent.
  • the drive rod 19 has an annular recess 35 which is delimited on one side by a shoulder 36 and on the other side by a snap ring 37.
  • the bottom 11 has at its bore, through which the drive rod 19 passes, a projection 38 which engages in the annular recess 35 of the drive rod 19. This projection 38 abuts the shoulder 36 in one position of the base 1 and in the other position of the base 1 this projection abuts the snap ring 37.
  • the projection 38 is designed such that it comes to a gas-tight system on the snap ring 37.
  • recesses 39 are formed in the manner of radially arranged cutouts. This creates a connection between the pressure chamber 3 and the compression space 11 in the position of the base 1, in which the projection 38 rests on the shoulder 36.
  • the wall of the pressure chamber 3, the nozzle 12 and the partition wall 25 are connected to the Bottom 1 firmly connected and thereby also displaceable relative to the drive rod 19 within the limits of the recess 35.
  • the SF6 impression switch shown has the following functions:
  • the function corresponds to that known from conventional SF6 impression switches:
  • the gas is compressed by the switching movement, mediated by the drive rod 19, between the base 1 moved with the drive rod 19 and the fixed base 2 in the compression space 11, passes through the inflow opening 7 and flows through the opening 5 to the arc 23 around it to blow at zero crossing.
  • the quenching gas opens the closure element 8 in this way, flows through the pressure chamber 3 and, after leaving the pressure chamber 3 through the outflow opening 5, finally reaches the switching path 4 in order to blow the arc 23.
  • the outflow opening 5 is not closed by the check valve 6, since in the case of low-current arcs there is no gas pressure wave which is strong enough to close the check valve 6 against the force of the spring 31.
  • the SF6 impression switch adapts to the conditions caused by the gas expansion and uses this gas expansion to produce the required insulating gas pressure:
  • insulating gas is compressed in the compression space 11 in the manner described above, flows through the inflow opening 7 into the pressure chamber 3, the closure member 8 being opened by the gas flow.
  • the arc 23 is drawn in the switching path 4, as a result of which extinguishing gas expands and, as represented by the curved arrow, flows in the direction of the compression device.
  • the outflow opening 5 is closed by the check valve 6 and the gas under pressure flows into the gas storage space 9.
  • the closed check valve 6 in the pressure chamber 3 and the compression chamber 11 produce reproducible pressure conditions, so that a specific pressure can be assigned to a specific distance between the switching contacts 21 and 22.
  • the pressure in the compression space 11 drops sharply, which has the consequence that the closure member 8 moves into the position in which it closes the inflow opening 7 with its radial leg and at the same time opens the opening 10.
  • the drive is completely relieved of the pressure force in the compression chamber 11 by venting it, so that there is no braking of the switching movement or even a backward movement, on the contrary - the switching movement is even accelerated by the relief.
  • the drive advantageously only has to apply the energy for the pre-compression of the gas in the pressure chamber 3.
  • the expanded gas which is stored in the gas storage space 9 and thereby cooled, flows through the opening 10 into the pressure chamber 3.
  • the cold gas pre-compressed in the pressure chamber 3 is post-compressed by the gas pressure wave coming from the gas storage space 9, which cold gas of high density lies in front of the outflow opening 5 in order to serve the blowing at the moment of zero current crossing which is decisive for the extinguishing of the arc.
  • the gas pressure generated by the arc 23 decreases, the check valve 6 opens and the cold gas cushion flows out of the outflow opening 5 in the direction of the switching path 4 in order to blow the arc there. In this way, optimal extinguishing conditions were created while relieving the load on the drive.
  • the valve 35 to 39 has no function in the shutdowns: If the drive rod 19 is moved downward to shutdown, the base 1 initially remains due to the inertia of itself and the pressure chamber wall, the partition 25 and the insulating material nozzle 12, as well as under the action of Frictional force of the contact 32 in its position. As a result, the projection 38 rests gas-tight on the snap ring 37 regardless of the starting position of the base 1, as a result of which the base 1 is carried along in the course of the opening movement. The gas compressed in the compression space 11 also exerts a compressive force on the base 1, which also presses the base 1 against the snap ring 37.
  • ventilation of the compression space 11 is achieved through the pressure chamber 3 through the valve 35 to 39: at the beginning of the switch-on movement, the base 1 and the switching element 21, the pressure chamber 3, the gas storage space 9 and the nozzle 12 remain, which are connected with are firmly connected to the floor 1, due to their inertia and due to the frictional force of the contact 32, initially in their initial position.
  • the drive rod 19 thus initially moves upwards without taking the floor 1 with it until the projection 38 bears against the shoulder 36 and the drive takes the floor 1 with it. In this position there is a connection via the recesses 35 and 39 between the pressure chamber 3 and the compression space 11.
  • the goal is achieved to fill the pressure chamber 3 with cold gas by the switch-on movement, so that cold quenching gas is provided in the pressure chamber 3 for renewed arcing.
  • arc quenching is also ensured if a short-time switch-off takes place shortly after the interruption of a short-circuit current, which requires blowing of the arc with the aid of the compression device.
  • the fact that the hot low-density gas is in the compression chamber 11 is harmless because this gas only flows to the switching path when all the cold gas from the pressure chamber 3 has blown the arc 23. At this point in time, when the gas of lower density flows in from the compression space 11, the arc 23 has already been extinguished.
  • Fig. 2 shows a different embodiment of the floors 1 and 2 and the cylinder of the compression chamber, which as a cylinder 17 'with the bottom 1st is connected and is pulled by the switch-off movement over the bottom 2 designed as a piston.
  • the vent valve 14 is opened against the force of a spring 14 ⁇ by a pin 18.
  • the length of this pin 18 is dimensioned such that the vent valve 14 lifts the valve plate of the vent valve 14 out of its closed position when a sufficient distance between the switching pieces 20 and 21 is reached for arc extinguishing.
  • the spring 14 ⁇ must have a larger spring constant than the spring 14 'described in Fig. 1.
  • the closure member 8 is also designed as an L-shaped ring, but in order to achieve better guidance, the axial leg is longer and the connection to the valve 35 to 39 is made through a bore.
  • the opening leading from the gas storage space 9 into the pressure chamber 3 has been moved upwards compared to FIG. 1 in order to insert a shoulder 47 designed as a projection of the drive rod 19.
  • the lower end 46 of the partition wall 25 was designed such that when it is switched on when the projection 38 bears against the shoulder 36, there is a gas-tight seal between the end 46 of the partition wall 25 and the shoulder 47. As a result, a closable opening 10 'is achieved.
  • the advantage of this design is that the fresh gas flow is passed completely through the pressure chamber 3, whereby a complete filling of the pressure chamber 3 with fresh gas is achieved, so that cold gas of high density is available in sufficient mass for renewed arcing and also the walls a certain amount Experience cooling.
  • the check valve 6 is also designed differently than in FIG. 1:
  • the check valve 6 has arms 34 which point in the direction of the switch axis and which, when switched on by means of a collar 33 connected to the drive rod 19, lift the check valve 6 out of its closed position.
  • This opening of the check valve 6 takes place due to the displaceability of the base 1 relative to the drive rod 19, which when switched on also leads to a relative movement of the valve seat of the check valve 6 relative to the drive rod 19 and thus the collar 33.
  • the remaining function of the check valve 6 is not impaired and a spring is not required.
  • Fig. 2 shows the switching off of a high-current arc.
  • the straight arrow shows the switch-off movement of the drive rod 19.
  • the gas pressure wave caused by the arc 23 flows in the direction of the curved arrow with the check valve 6 closed, through the inlet 26 into the gas storage space 9 and from there, in the second one described above (FIG. 1) Phase of the switch-off, through the opening 10 'in the pressure chamber 3.
  • the dashed arrows show the backflushing of the gas from the pressure chamber 3 when the current approaches the zero crossing with a blowing of the arc 23. Since the sufficient distance to achieve an arc extinguishing between the Switch contacts 20, 21 is achieved, the pin 18 has opened the vent valve 14.
  • the arrows pointing through the vent hole 13 show the venting of the compression space 11, which leads to a relief of the drive.
  • Fig. 3 shows the embodiment of FIG. 2 when switched on.
  • the straight, upward-pointing arrow shows the switch-on movement of the moving switch parts.
  • the projection 38 lies against the shoulder 36, as a result of which the pressure chamber 3 is connected to the compression space 11 via the recess 35 and the recesses 39 and the ventilation opening 30.
  • the compression space 11, which increases as a result of the switch-off, sucks the gas from the pressure chamber 3, as the dashed line shows. Since the check valve 6 is open, as shown by the curved arrows, fresh high-pressure quenching gas flows from the switching chamber surrounding the arc quenching device through the Nozzle 12 and the outflow opening 5 into the pressure chamber 3.
  • the vent valve 14 is closed when it is switched on.
  • the inflow opening 7 serves as a ventilation opening for switching on.
  • the closure member 8 takes over the function of the valve, this closure member 8 being opened when switched on.
  • the base 1 is equipped with an annular projection 43 which comprises the drive rod 19.
  • This projection 43 engages in an annular groove 40 of the drive rod 19, the base 1 — and the switch parts connected to it — can carry out a slight displacement in that the projection 43 has a smaller width than the groove 40.
  • the projection 43 When it is switched off the projection 43 on the Shoulder 41 of the groove 40 on.
  • the projection 43 rests on the shoulder 42.
  • the bottom 1 slides in a gastight manner on the drive rod 19.
  • a holding lug 45 is connected to the drive rod 19 and engages in a recess 44 in the closure member 8.
  • This retaining lug 45 is arranged such that when it is switched on, it lifts the closure member 8 out of its closed position due to the relative movement of the base 1 with respect to the drive rod 19.
  • the pressure chamber 3 is connected to the compression space 11 via the inflow opening 7.
  • the arrow through the inflow opening 7 shows the suction of the gas located in the pressure chamber 3 in the compression chamber 11.
  • the opening 10 ' is closed in the manner described above.
  • the fresh gas can flow into the pressure chamber 3 as described in FIG. 3.
  • the relative movement of the base 1 with respect to the drive rod 19 takes place, as already explained, by the inertia, the friction and the pressures.
  • Fig. 5 shows the same training when switching off a high-current arc.
  • the inflow opening 7 was closed by the fact that the pin 18 had opened the vent valve 14 (second phase of the switch-off) under the pressure of the spring 24 on the closure member 8 and the gas pressure wave flows through the opening 10 'into the pressure chamber 3.
  • the check valve 6 opens and the arc is blown.
  • FIG. 6 shows the design according to FIG. 4 when a low-current arc is switched off.
  • the gas compressed in the compression chamber 11 flows through the inflow opening 7 while opening the closure member 8 against the pressure of the spring 24 and closing the opening 10 'into the pressure chamber 3. From there, this quenching gas flows through the check valve 6 to the switching path, where the arc is blown.
  • the partition 25 is formed at its lower end 46 so that it comes to rest with the closure 48, which is formed by the upper part of the vertical leg of the closure member 8, thereby closing the opening 10 '.

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EP89117724A 1988-12-23 1989-09-26 Interrupteur monopression à SF6 Expired - Lifetime EP0374384B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883843406 DE3843406A1 (de) 1988-03-25 1988-12-23 Sf(pfeil abwaerts)6(pfeil abwaerts)-eindruckschalter
DE3843406 1988-12-23

Publications (3)

Publication Number Publication Date
EP0374384A2 true EP0374384A2 (fr) 1990-06-27
EP0374384A3 EP0374384A3 (fr) 1991-06-19
EP0374384B1 EP0374384B1 (fr) 1994-12-28

Family

ID=6369955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117724A Expired - Lifetime EP0374384B1 (fr) 1988-12-23 1989-09-26 Interrupteur monopression à SF6

Country Status (2)

Country Link
EP (1) EP0374384B1 (fr)
DE (1) DE58908837D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0766278A2 (fr) * 1995-09-30 1997-04-02 Asea Brown Boveri Ag Disjoncteur
FR2751462A1 (fr) * 1996-07-22 1998-01-23 Gec Alsthom T & D Sa Disjoncteur a haute tension a auto-soufflage d'arc
EP1091378A1 (fr) * 1999-10-07 2001-04-11 Schneider Electric High Voltage SA Disjoncteur à autoexpansion à clapet de surpression et de remplissage
EP3032561A1 (fr) * 2014-12-08 2016-06-15 Siemens Aktiengesellschaft Arrangement d'interrupteur électrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568649A5 (fr) * 1974-07-29 1975-10-31 Sprecher & Schuh Ag
DE3132825A1 (de) * 1981-06-18 1983-01-13 Sprecher & Schuh AG, 5001 Aarau, Aargau Druckgasschalter
FR2575323A1 (fr) * 1984-12-20 1986-06-27 Alsthom Atlantique Disjoncteur a gaz comprime
EP0239068A1 (fr) * 1986-03-26 1987-09-30 Gec Alsthom Sa Disjoncteur à gaz diélectrique sous pression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568649A5 (fr) * 1974-07-29 1975-10-31 Sprecher & Schuh Ag
DE3132825A1 (de) * 1981-06-18 1983-01-13 Sprecher & Schuh AG, 5001 Aarau, Aargau Druckgasschalter
FR2575323A1 (fr) * 1984-12-20 1986-06-27 Alsthom Atlantique Disjoncteur a gaz comprime
EP0239068A1 (fr) * 1986-03-26 1987-09-30 Gec Alsthom Sa Disjoncteur à gaz diélectrique sous pression

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0766278A2 (fr) * 1995-09-30 1997-04-02 Asea Brown Boveri Ag Disjoncteur
EP0766278A3 (fr) * 1995-09-30 1998-11-04 Asea Brown Boveri Ag Disjoncteur
FR2751462A1 (fr) * 1996-07-22 1998-01-23 Gec Alsthom T & D Sa Disjoncteur a haute tension a auto-soufflage d'arc
EP1091378A1 (fr) * 1999-10-07 2001-04-11 Schneider Electric High Voltage SA Disjoncteur à autoexpansion à clapet de surpression et de remplissage
FR2799571A1 (fr) * 1999-10-07 2001-04-13 Schneider Electric High Voltag Disjoncteur a autoexpansion a clapet de surpression et de remplissage
EP3032561A1 (fr) * 2014-12-08 2016-06-15 Siemens Aktiengesellschaft Arrangement d'interrupteur électrique

Also Published As

Publication number Publication date
EP0374384A3 (fr) 1991-06-19
EP0374384B1 (fr) 1994-12-28
DE58908837D1 (de) 1995-02-09

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