WO1999060590A1 - Mean or high voltage interrupter device comprising a t-shaped circuit breaker mobile in rotation - Google Patents

Abstract

The invention concerns an interrupter device comprising a circuit breaker (1) bordered by two bar supports (3, 5), The circuit breaker (1) comprises a support column (7) mounted on a frame (9) and two interrupter chambers (11, 13) fixed on the support column in T-shaped configuration. The support column (7) is mounted mobile in axial rotation on the frame (9) via a trunnion mounting (27). Each support (3, 5) supports a bar (25) provided with a fixed contact jaw (25A) for co-operating with a conductor (11C, 13C) of each mobile interrupter chamber (11, 13), and is provided with telescopic earth connection (37, 39). The invention is characterised in that the support column (7) rotation enables to separate or connect each interrupter chamber (11, 13) contact jaw (25A) and the conductor (11C, 13C) The device thus ensures the disconnection of the open circuit breaker with a reduced number of members and controls, and is more compact and less costly.

Description

 MEDIUM OR HIGH VOLTAGE CUTTING DEVICE INCLUDING A ROTATING MOBILE T CIRCUIT BREAKER

The invention relates to a medium or high voltage circuit breaker which comprises a support column mounted on a chassis and two breaking chambers fixed to the support column in a T configuration. In a known manner, the column support for such a circuit breaker is fixedly mounted on the chassis to effectively support the two breaking chambers and meet the usual standards for the resistance of electrical equipment to the stresses of connections and external mechanical stresses such as wind or earthquakes.

Most often, the circuit breaker is bordered by two disconnectors which each cooperate with its terminal terminals. The disconnectors are for example of the type with two columns, or with pantograph or with vertical cut-off. A mechanical or electrical control device is associated with each disconnector and is controlled by an electrical or electronic system to ensure the opening or closing of the two disconnector in a manner coordinated with that of the circuit breaker.

The object of the invention is to open and close the two disconnectors which line a circuit breaker in a medium or high voltage electrical cut-off device with a reduced number of components and controls.

To this end, the subject of the invention is a medium or high voltage circuit breaker which comprises a support column mounted on a chassis and two breaking chambers fixed to the support column according to a T-configuration, characterized in that the support column is mounted movable in axial rotation on the chassis by means of a pin.

The invention also extends to a high or medium voltage electrical cut-off device, which comprises a support column circuit breaker mounted mobile in rotation on a chassis and which is bordered by two busbar supports which each include a fixed contact jaw which cooperates with a conductor of each mobiie breaking chamber. According to the invention, the support column is mounted mobile on the chassis via the pin to separate or connect the contact jaw and the conductor of each breaking chamber. The contact jaws are integral with the bar supports to allow a connection at closing or a separation at opening with the conductors of the movable breaking chambers in rotation. The device thus ensures the cutting of the open circuit breaker with a reduced number of members and controls, and has a limited size and cost.

By this arrangement, it removes the movable arm or the pantograph of each disconnector, as well as the individual mechanical control of these organs. The cutting results simply from the rotational movement of the interrupting chambers relative to the fixed jaws.

An electromechanical device is arranged in the chassis to control the opening or closing of the circuit breaker by means of an operating rod disposed inside the support column. The operating rod is integral in rotation with the support column so that the rotation of the pin causes the rotation of the mechanical device. Preferably, the electromechanical device and the operating rod are connected by means of a second pin mounted inside the chassis to make the electromechanical device independent of the rotation of the support column. In this way, the energy required for the rotational movement of the support column and of the two breaking chambers is reduced. According to another advantage of the invention, each bar support is associated with a telescopic earthing, which contributes to reducing the size of the electrical cut-off device. It is also planned to replace a telescopic earthing with a swivel arm.

Other characteristics and advantages of the invention will appear on reading the description of an embodiment illustrated by the drawings.

Figure 1 shows a breaking device according to the invention in which a circuit breaker is connected to two busbars supported by two supports bordering the circuit breaker.

Figure 2 shows the cut-off device of Figure 1 in which the circuit breaker is disconnected from the two busbars after a 90 degree rotation of the circuit breaker support column.

A high or medium voltage electrical cut-off device comprises, in FIG. 1, a circuit breaker 1 bordered by two busbar supports 3 and 5.

The circuit breaker comprises a support column 7 and two breaking chambers 11 and 13 fixed to the top of the support column 7 in a T-configuration.

The support column 7 is mounted on a frame 9 which is intended to rest on the ground where the electrical device is installed. The material constituting the support column 7, for example porcelain, is insulating and is shaped in a succession of fins to guarantee the electrical insulation of the chassis in the event of rainwater runoff.

The fixing of the two switching chambers 11 and 13 on the support column 7 is ensured by a conductive connecting element 15. Each switching chamber 11 or 13 includes a insulating outer casing, for example made of porcelain, and a means of cutting off an electric current consisting mainly of a fixed contact and a movable contact arranged inside the casing. When the two cut-off means are in the closed position, an electric current flows through a conductor 110 projecting from a casing

11A of one 11 of the two breaking chambers, the fixed and movable contacts of the two breaking means, the connecting element 15, and a conductor 13C projecting from a casing 13B of the other 13 breaking chamber. For the sake of clarity, the breaking devices and the conductive elements have not been shown, with the exception of the protruding conductors of the casings. In FIG. 1, it can be seen that the protruding conductors 11 C and 13C of the casings 11A and 13A are protected from a peak effect or from a corona effect by guard rings 11 B and 13B circular or ellipsoid.

The two support bars 3 and 5 consist of an insulating column 17 and 19 which is mounted on a frame 21 and 23. They support at the top of the insulating column 17 or 19 a conductive bar 25. According to the invention, the support column 7 of the circuit breaker is mounted movable in axial rotation on the chassis 9 by means of a pin 27. The two busbar supports 3 and 5 each comprise a fixed contact jaw 25A.

As indicated above, the support column 7 is movably mounted on the chassis 9 via the pin 27 to separate or connect the contact jaw 25A and the conductor 11 C or 130 of each switching chamber 11 or 13. The jaws 25A contact are integral with the bar supports 3 and 5 to allow a connection to the closure or separation at the opening with the conductors of the movable breaking chambers in rotation. The device thus ensures the cut-out of the open circuit breaker with a reduced number of components and controls.

The removal of a movable member associated with each disconnector as well as the control of these members provides the device according to the invention with reduced bulk and cost.

In the example of FIG. 1 or 2, the two contact jaws 25A are held by a piece 17A or 19A disposed at the top of the insulating column 17 or 19 of the bar supports. The pin 27 has a pinion system 29 which is controlled by a motor 31 arranged in the chassis 9 to maneuver in rotation the support column 7. It is planned to equip the contact jaws 25A with a known icebreaker device in itself.

It should be noted that the pin 27 does not weaken the mechanical strength of the support column 7 and that a support column meeting the usual standards of resistance to external stresses is rotated through the pin in the condition, without requiring structural reinforcement.

Figure 2, the circuit breaker is disconnected from the busbars

25. The sectioning was obtained by an axial rotation, indicated by arrow F, of the support column 7 and of the two cutting chambers causing separation of the jaws 25A from the projecting conductors 11C and 130.

Preferably, the support column is rotated 90 degrees to guarantee a maximum dielectric withstand distance in air. By way of example, the motor 31 controls the pin 27 at a speed such that the rotation of the support column 7 by 90 degrees lasts between 5 and 20 seconds.

In the example of Figures 1 and 2, an electromechanical device

33 is arranged in the frame 9 to control in translation an operating rod 35 disposed inside the support column 7. The translation of the operating rod makes it possible to control the movable contact of the switching means of the breaking means of each breaking chamber 11 and 13 in movement in order to open or close the circuit breaker.

The control rod 35 is structurally integral in rotation with the support column 7 so that the rotation of the pin 27 causes the rotation of the electromechanical device 33. To this end, provision is made for a flexible electrical connection of the electromechanical device 33 with a power supply so as not to risk a break in the connection during the rotation of the device. Preferably, the electromechanical device 33 and the operating rod 35 are connected by means of a second pin 37 mounted inside the chassis 9 to make the electromechanical device 33 independent of the rotation of the support column 7. In this way, the energy required for the rotational movement of the support column 7 and of the switching chambers 11 and

13.

According to an advantage of the invention, each bar support 3 or 5 is provided with a telescopic earthing 37 or 39 which contributes to reducing the size of the breaking device. When the circuit breaker is connected to the busbars 25, Figure 1, the earthing is in the lowered position. After opening the circuit breaker and then rotating the support column 7, one or both of the earth connections are operated to engage in an earth jaw 3B or 5B fixed to the busbar 25. It is planned to replace the telescopic earthing systems with a pivoting arm relative to each busbar support 3 or 5.

Guard rings 30 and 50 are mounted around the top of the insulating column 17 and 19 and earth jaws 3B and 5B to prevent a tip effect or a corona effect. According to another advantage of the invention, it is planned to install a measurement cell by current transformation, of the Faraday or Rogowski type, or by voltage transformation, of the Pockels type, in one of the housings 11 A or 13A switching chambers 11 or 13. An electronic unit intended for supplying the cell with a transmission signal and for the acquisition and processing of a reception signal, is arranged inside the chassis 9 to contribute reducing the size of the cut-off device. The transmission and reception signals are transported by optical fibers which are housed inside the support column 7 and the breaking chambers 11 and 13 to take advantage of the protected atmosphere which reigns in these elements and which consists for example of air or dielectric gas such as sulfur hexafluoride SF ₆ under pressure. It is also planned to house the optical fibers inside capacitors 11D and 13D mounted in parallel with the breaking chambers 11 and 13.

The optical fibers constitute a sufficiently flexible connection to be compatible with the rotation of the support column 7 during the separation or connection of the contact jaws 25A of the conductive bars 25 and of the conductors 11c and 13C of two interrupting chambers 11 and 13 of the circuit breaker.

The invention is dedicated to high or medium voltage electrical substations, in particular between 345 and 500 kilovolts.

Claims

99/60590 CLAIMS 1. A medium or high voltage circuit breaker (1) which comprises a support column (7) mounted on a chassis (9) and two breaking chambers (11, 13) fixed to the support column according to a T-configuration , characterized in that the support column (7) is mounted movable in axial rotation on the chassis (9) by means of a journal (27). 2. A circuit breaker according to claim 1, in which an electromechanical device (33) is disposed in the chassis (9) and controls in translation an operating rod (35) for opening or closing the circuit breaker, disposed inside. of the support column (7), by means of a second pin (37) with independent rotation of the pin (27) of the support column (7). 3. A medium or high voltage electrical cutoff device, which comprises a circuit breaker (1) according to one of claims 1 or 2 and which is bordered by two supports (3,5) of bars (25) which each include a fixed contact jaw (25A) for cooperating with a conductor (11C.13C) of each movable breaking chamber (11,13). 4. A cut-off device according to claim 3, which comprises a telescopic earthing (37,39) or a pivoting arm adjoining each bar support (3,5). 5. A cut-off device according to claim 3 or 4, in which a measurement cell by transformation of current or voltage is installed inside a casing (11A.13A) of each conductor (110,130) and communicates with an electronic system arranged in the chassis via optical fibers. 6. A device according to claim 5, in which the optical fibers are housed in the support column (7) and in the interrupting chambers (11, 13). 7. A device according to claim 5, in which the optical fibers are housed in the support column (7) and in two capacitors (11 D.13D) mounted in parallel with the interrupting chambers (11, 13).