EP2510530A1 - High-voltage circuit breaker with a removable screen for improving the field gradient - Google Patents
High-voltage circuit breaker with a removable screen for improving the field gradientInfo
- Publication number
- EP2510530A1 EP2510530A1 EP10787765A EP10787765A EP2510530A1 EP 2510530 A1 EP2510530 A1 EP 2510530A1 EP 10787765 A EP10787765 A EP 10787765A EP 10787765 A EP10787765 A EP 10787765A EP 2510530 A1 EP2510530 A1 EP 2510530A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- screen
- circuit breaker
- contact support
- voltage circuit
- 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
Links
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
- H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
- H01H33/245—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring using movable field electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
Definitions
- the invention relates to electrical switchgear which must improve the performance with respect to electric field that appears during switching. It relates in particular to circuit breakers which it is desired to improve the coordination of the various parts provided vis-à-vis the electric field, during an opening operation of the disjcateur.
- High-voltage circuit breakers used to interrupt large short-circuit currents require a relatively large piston to create the overpressure required to blow the arc when opening the circuit breaker. This imposes an extremely wide radial space between the central contact, the rod and the corresponding permanent contact. As a result, electric field values become extremely important at the end of the rod. Thus, the performance of the high-voltage circuit breakers are depreciated, particularly the resistance to the inherent transient recovery voltage due to the power cut of the lines, cables or capacitor banks.
- another geometry must be proposed to improve the field values at the end of the rod. This consists in using a metal screen or a screen made of a material with a high dielectric constant and with a suitable shape. This screen can slide between the rod and the permanent contact. In this way, the shape of the equipotential lines changes and, as a result, the electric field can decrease significantly in other words for acceptable values.
- the display To fulfill its role, the display must remain stationary at least until the separation of the contacts or until the contacts of the circuit breaker travel a certain distance. At the end of this run, the position they arrived at is considered to be the starting point where the values of the electric field on the ends of the contacts start to be critical. At this determined moment, the screen must begin to move with one of the contacts until the end of the race of the latter. Springs pre ⁇ compressed define the initial position of the screen.
- US Patent 6,410,873 uses a very complicated mechanism consisting of lever systems.
- US Patent 4,132,876 Figure 1 implements a simple movement of contact with a screen operated by insulating rods. These very complicated mechanisms are unreliable for metal-enclosed circuit breakers in which external screens are generally used.
- the screen does not need to follow the rod which is fixed. Thus, it stops when it reaches the desired position.
- the screen is conveniently actuated via the nozzle, by means of a mechanism which also acts as a double-motion transmission system. So the screen, as for the documents presented previously, moves in a direction opposite to that of the stem, which is the contact that one wishes to protect. Thus, the effectiveness of such a device is low.
- the end position is much more advanced than that of the rod. Therefore, it is much more difficult to ensure a sufficient ratio between the electric field on the arcing contacts and that on the permanent contacts such that when a breakdown occurs, it always occurs between the arcing contacts.
- one of the disadvantages of this mechanism is that the mechanical shocks are cashed by the insulating nozzle during closing maneuver, while it is an extremely sensitive part.
- the object of the invention is to overcome the aforementioned drawbacks relating to the documents mentioned above.
- the concept according to the invention consists in modifying and / or reducing the radial space between the fixed contact (the arc electrode 4 in the document US 4,132,876) and the fixed permanent contact (the permanent contact 13 in the document US 4,132,876 This is intended to smooth out the equipotential lines. Then, the gradient variation of voltage decreases substantially and thus the electric field at the contact ends is greatly diminished. This lowers the E / N electric field / gas density ratio and reduces the risk of re-ignition, ie increases the resistance to the inherent transient recovery voltage due to the interruption of line currents, cables or batteries of capacitors.
- the main object of the invention is a high-voltage circuit breaker comprising two movable contacts relative to each other, so as to deviate to effect a power failure, the circuit breaker comprising, among others, a screen which surrounds a first of the two contacts and which has a support housing and must follow during a second part of the stroke of this first of the two contacts, the final position of the screen being defined by compressed springs, the second of the two contacts also having a crankcase.
- the screen is slidably mounted in the support housing of the first of the two contacts, is fixed to a rudder and is driven by a central body secured to the support of the second of the two contacts, during the separation of the two contacts as soon as possible.
- the screen having a stop that is integral with it and positioned to come into contact with the rudder and to drive the screen in the second part of the relative stroke of the first movable contact by coming into contact with the latter, when sliding apart, the housing of the first movable contact with the housing of the second movable contact , the two contacts moving in opposite directions with respect to each other.
- a control lever pivotally mounted towards its middle about a fixed axis relative to a fixed frame and being actuated in rotation by motor means;
- a first operating lever pivotally mounted at a first end to a first end of the control lever and pivotally mounted at a second end to the support housing of the first movable contact via the lifter;
- Two second operating levers pivotally mounted by a first end to a second end of the control lever and pivotally mounted at its second end to the support housing of the second movable contact.
- the first contact support casing and the second contact support are preferably slidably mounted relative to the fixed frame of the circuit breaker.
- the stop is mounted on a rod screwed into the screen. It is also possible that the circuit breaker has rods screwed into the screen to pre-compress the springs. LIST OF FIGURES
- FIGS. 3A, 3B and 3C in sections, the high-voltage circuit breaker, according to the invention, in three positions of its operation, during the opening thereof, and
- FIGS. 4A, 4B, 5A, 5B, 6A and 6B curves illustrating the results of the computation of the electric field on the arcing contacts and on the permanent contacts.
- Flared part 5B; Body: 5C;
- Second contact support 8;
- Second contact housing 10;
- Stopper 28 (from the flange 18);
- FIG. 2 shows, in section, the central part of the circuit breaker according to the invention, for the purpose of locating the screen 1, which is movable and which is intended to be positioned in such a way that determined around a first movable contact 2, constituted by the end of a rod 3, translating longitudinally in the circuit breaker, in the center thereof.
- the other contact 6 consists of a hollow tip, of revolution, placed in a cover 7, itself placed on a second contact support 8.
- blowing nozzle 5 comprising a first conical portion 5A, placed on the right in the figures, on the side of the first contact 2, a central and cylindrical body 5C and a part extended 5B placed on the side of the second contact 6.
- This blowing nozzle 5 allows to concentrate the jet of gas at the determined moment to blow the arc when the two contacts 2 and 6 move away from each other.
- the assembly is structured by a central insulating tube 14 through which the movement of the second contact 6 (motor) is transmitted to the first contact 2, placed around the blowing nozzle 5.
- a first contact support casing 16 is fixed in a crossbar 15 carrying the rod 3, at the end of which is the first contact 2.
- a second contact housing 10 is placed around the second contact support 8 carrying the second contact 6.
- One of the master pieces of the circuit breaker is a screen 1 placed inside a fixed body 9, positioned on the inner wall of the first contact support casing 16 attached to a lifter 15. Its shape is therefore of hollow revolution and surrounds globally, at a determined distance, the left part of the rod 3. Its role is to follow the latter, in particular the first contact 2 constituting its end, from a given moment of the respective stroke of the two contacts 2 and 6.
- the presence of the screen 1 contributes to reducing the variation of voltage gradient and thus significantly reduce the electric field at the end of the first contact 2.
- the second contact support assembly 8 is placed a little to the left, inside the second contact housing 10.
- the left end 20 of the first contact support housing 16 surrounds the right end 21 of the second contact housing 10.
- the assembly located inside the central body 14 is completely surrounded by the first contact support casing 16, since the central body 14 is integral with the second contact housing 10. There is therefore a sliding of the first contact support casing 16 around the whole of the second contact housing 10 and the central body 14.
- FIGS. 3A, 3B and 3C show, inter alia, the actuation of all its parts of the circuit-breaker, thanks, in particular, to three levers, which are a control lever 22, pivotally mounted about a horizontal axis 23, which is fixed relative to the assembly, that is to say fixed relative to a frame on which is fixed the circuit breaker.
- control lever 22 In the closed position of the circuit breaker, illustrated by this FIG. 3A, the control lever 22 has a first end 22A, to which is mounted, in an articulated manner, a first end 24A of a first operating lever 24 whose other end 24B is hingedly mounted on the central portion of the rudder 15.
- a second end 22B of the control lever 22 is hingedly connected to a first end 25A of two second operating levers 25, whose second end is hingedly mounted on an end ring 26 of the part flared 5A of the blast nozzle 5, also integral with the assembly of the central body 14 and the second contact casing 10.
- control lever 22 is inclined, so that the first operating lever 24 is pushed to the left. In this way, the rudder 15 is itself pushed to its extreme position to the left. In correspondence, the two operating levers 25 are pulled to the right, keeping the entire second contact housing 10 of the central insulating tube 14, to the interior, to the right.
- control lever 22 continued to rotate and pulled the first operating lever 24 to the right, pulling the rod 3 and contact 2 to the right to its maximum.
- FIG. 3C shows the end of this compression of springs 17.
- the screen 1 was thus driven, together with the compression of the springs 17 to the right, by means of the stop 30, placed to the right of the rod 31.
- the main advantage of this circuit breaker is an improved resistance to the transient recovery voltage inherent due to the power cut of the lines, cables or capacitor banks, especially for very high voltages.
- FIGS. 4A and 4B illustrate the values of the gradient of the electric field calculated for a speed of 13 m / s without a moving screen.
- FIGS. 5A and 5B illustrate the values of the gradient of the electric field calculated for a speed of 19 m / s without a moving screen
- FIGS. 6A and 6B illustrate the values of the gradient of the electric field calculated for a speed of 13 m / s with screen mobile.
- the results presented relate to the voltage that has been applied on the side of the rod (first moving contact 2) and in FIGS. 4B, 5B, 6B, the calculations presented relate to the voltage which has been applied on the side of the tulip (second moving contact 6).
Landscapes
- Circuit Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0958771A FR2953639B1 (en) | 2009-12-09 | 2009-12-09 | HIGH VOLTAGE CIRCUIT BREAKER WITH REMOVABLE SCREEN FOR IMPROVING THE GRADIENT OF FIELD |
PCT/EP2010/069087 WO2011070022A1 (en) | 2009-12-09 | 2010-12-07 | High-voltage circuit breaker with a removable screen for improving the field gradient |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2510530A1 true EP2510530A1 (en) | 2012-10-17 |
EP2510530B1 EP2510530B1 (en) | 2014-04-16 |
Family
ID=42315805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10787765.6A Not-in-force EP2510530B1 (en) | 2009-12-09 | 2010-12-07 | High-voltage circuit breaker with a removable screen for improving the field gradient |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2510530B1 (en) |
CN (1) | CN102725810B (en) |
FR (1) | FR2953639B1 (en) |
WO (1) | WO2011070022A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3151261A1 (en) | 2015-10-02 | 2017-04-05 | Siemens Aktiengesellschaft | Cam circuit-breaker for medium and high voltages |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2982069B1 (en) | 2011-10-27 | 2013-12-20 | Alstom Technology Ltd | CUTTING CHAMBER WITH A TUBE LIMITING THE IMPACT OF PARTICLE GENERATION AND ELECTRIC CUTTING EQUIPMENT EQUIPPED WITH SUCH CUTTING CHAMBER |
CN102881477B (en) * | 2012-09-24 | 2014-12-24 | 中国西电电气股份有限公司 | Double glide transmission mechanism |
FR3008225B1 (en) * | 2013-07-08 | 2016-11-25 | Alstom Technology Ltd | REMOVABLE SCREEN BREAKER |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2140284A1 (en) * | 1971-08-06 | 1973-02-15 | Siemens Ag | ELECTRIC PRESSURE GAS SWITCH |
JPS5238173A (en) * | 1975-09-22 | 1977-03-24 | Hitachi Ltd | Buffer gas breaker |
CH644969A5 (en) | 1979-09-25 | 1984-08-31 | Sprecher & Schuh Ag | Gas pressure switch. |
WO1995027299A1 (en) | 1994-04-05 | 1995-10-12 | Abb Power T & D Company Inc. | Moving gas mixing plate for puffer interrupter |
US5478980A (en) * | 1994-04-05 | 1995-12-26 | Abb Power T&D Company, Inc. | Compact low force dead tank circuit breaker interrupter |
DE19622460C2 (en) * | 1996-05-24 | 1998-04-02 | Siemens Ag | High-voltage circuit breaker with two drivable switch contact pieces |
FR2783088B1 (en) * | 1998-09-09 | 2000-10-13 | Alstom Technology | SWITCH WITH A LONG-TERM INSERTION RESISTOR INSERTION SYSTEM |
DE29901205U1 (en) | 1999-01-15 | 1999-05-12 | Siemens AG, 80333 München | High-voltage circuit breakers, in particular compressed gas circuit breakers |
DE19902835C2 (en) | 1999-01-20 | 2001-12-06 | Siemens Ag | High-voltage circuit breaker with an insulating nozzle |
FR2826503B1 (en) * | 2001-06-25 | 2003-09-05 | Alstom | CUTTING CHAMBER WITH VACUUM BULB |
-
2009
- 2009-12-09 FR FR0958771A patent/FR2953639B1/en not_active Expired - Fee Related
-
2010
- 2010-12-07 EP EP10787765.6A patent/EP2510530B1/en not_active Not-in-force
- 2010-12-07 WO PCT/EP2010/069087 patent/WO2011070022A1/en active Application Filing
- 2010-12-07 CN CN201080054815.8A patent/CN102725810B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011070022A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3151261A1 (en) | 2015-10-02 | 2017-04-05 | Siemens Aktiengesellschaft | Cam circuit-breaker for medium and high voltages |
WO2017055051A1 (en) | 2015-10-02 | 2017-04-06 | Siemens Aktiengesellschaft | Circuit breaker with cam for medium and high voltages |
Also Published As
Publication number | Publication date |
---|---|
FR2953639A1 (en) | 2011-06-10 |
EP2510530B1 (en) | 2014-04-16 |
CN102725810A (en) | 2012-10-10 |
CN102725810B (en) | 2015-04-01 |
WO2011070022A1 (en) | 2011-06-16 |
FR2953639B1 (en) | 2012-01-13 |
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