EP1512160B1 - High voltage shielded gear comprising a circuit breaker with closure resistor mounted in a conducting bar - Google Patents

Description

The invention relates to a high-voltage shielded substation comprising, inter alia, a circuit breaker, an insertion resistor and an electrically conductive bar connecting the circuit breaker to the rest of the substation. Such an armored station is described for example in the French patent document FR2784500 . In this shielded substation, the circuit breaker is placed inside an envelope and the insertion resistor (also called the closing resistor) is mounted at one end of the envelope inside a tank attached to the enclosure. envelope by a flange. Other configurations exist where the insertion resistor and its reservoir are arranged in parallel with the circuit breaker envelope. In some configurations, as shown for example in the Japanese patent document JP01313823 the insertion resistor is disposed within the station envelope coaxially with the axis of the circuit breaker and is remotely surrounded by a metal cylinder which electrically connects an arc contact to a pole of the circuit breaker. breaker. In the latter document, however, the substation is insulated in the air contrary to a so-called shielded substation, since it comprises an insulating envelope that supports both poles and encloses the insulating gas. However, there are equivalent configurations in the shielded stations, the pole of the circuit breaker in question then being extended by a conductive bar remotely surrounded by the metal casing of the station.

These provisions of the insertion resistance are disadvantageous for the dimensions of the circuit breaker and for the bulk of the shielded station, in particular for a shielded station having an architecture similar to that of the station shown on the figure 1 and in which it is desired to install insertion resistors. For such a position, the installation of insertion resistors according to the known arrangements of the state of the art will require either a significant extension of the metal casing of the station to accommodate the resistances in this envelope, or the addition of tanks parallel to this envelope to accommodate the resistances outside the envelope.

An object of the invention is to overcome the large size of conventional shielded positions having insertion resistors housed longitudinally in the metal casing of the station, providing a more compact shielded station in the longitudinal direction.

For this purpose, the subject of the invention is a high-voltage shielded substation comprising at least one circuit-breaker which is surrounded by a vessel which extends in an axial direction, this circuit-breaker being associated with an electrically conductive hollow bar for the passage of the permanent current in the substation, this hollow bar being electrically connected to a moving contact of the circuit breaker when the circuit breaker is in the closed position for the passage of the permanent current, this mobile contact comprising at one end a first arcing contact, an insertion resistor being disposed within the hollow bar and electrically connected to the circuit breaker by an inserter, characterized in that the hollow bar is immersed in the vessel to form an angle with the axial direction, and in that the insertion resistance is electrically connected to a second arcing contact of the circuit breaker by the inserter, this second arcing contact being electrically isolated from the hollow bar at the m oins while it is separated from the first arc contact.

According to a particular embodiment of a shielded station according to the invention, the inserter is mounted inside a casing which is fixed at one end of the conductive bar, this housing being arranged to electrically connect the bar to the mobile contact of the circuit breaker when the latter is in the closed position.

Advantageously, the inserter comprises a sliding contact connected on the one hand to the insertion resistor and on the other hand to a fixed contact extended by the second arcing contact of the circuit breaker, this sliding contact consisting of a first support cylindrical which is movable in the axial direction by being slidable in a second support which is fixed. This second fixed support is preferably connected by a conductive rod to the insertion resistor.

According to another particular embodiment, the first cylindrical support of the inserter is arranged to come into contact, at the end of travel of the inserter, with a fixed contact electrically connected to the conductive bar.

• La figure 1 est une vue d'ensemble d'un poste blindé comprenant deux sous-ensembles de coupure disjoncteurs, et pouvant être avantageusement transformé en un poste selon l'invention;
• La figure 2 est une vue schématique d'une partie d'extrémité d'un poste blindé selon l'invention obtenu sur la base d'un poste analogue à celui montré à la figure 1, une résistance d'insertion étant montée à l'intérieur d'une barre conductrice creuse qui forme un pôle du poste;
• La figure 3 est une représentation schématique de l'inséreur équipant le poste selon l'invention durant la fermeture du disjoncteur ;
• La figure 4 est une représentation schématique de l'inséreur équipant le poste selon l'invention dans un état fermé du disjoncteur.

The invention will now be described in more detail and with reference to the accompanying drawings which illustrate an embodiment thereof by way of non-limiting example.

• The figure 1 is an overview of a shielded substation comprising two breaker breaking subassemblies, and which can be advantageously converted into a substation according to the invention;
• The figure 2 is a schematic view of an end portion of a shielded station according to the invention obtained on the basis of a station similar to that shown in FIG. figure 1 an insertion resistor being mounted inside a hollow conductor bar which forms a pole of the station;
• The figure 3 is a schematic representation of the inserter equipping the station according to the invention during the closure of the circuit breaker;
• The figure 4 is a schematic representation of the inserter equipping the station according to the invention in a closed state of the circuit breaker.

Figure 1 , the shielded station comprises inter alia a metal casing 1 which surrounds a circuit breaker extending in a longitudinal direction AX. In this example the circuit breaker comprises two cut-off subassemblies 2A and 2B disposed on either side of an actuator 3. The cut-off subassemblies 2A, 2B are spaced along the longitudinal direction AX which is horizontal here. , and each of them is electrically connected to a corresponding hollow conductor bar 4A, 4B which is vertical here. Each bar 4A, 4B is surrounded by a vertical cylindrical portion of the metal casing 1.

Each bar thus forms here an angle of 90 ° with respect to the longitudinal direction AX, but one can also consider a similar configuration in which at least one bar forms an angle different from 90 ° with respect to the longitudinal direction. The metal casing 1 comprises a tank 4 which surrounds the circuit breaker, and two rings 5A, 5B each surrounding a corresponding conductive bar 4A, 4B. Each ferrule substantially forms a tube extending vertically around the corresponding conductive bar and is fixed by a plurality of bolts to a corresponding branch of the vessel 4.

Advantageously, this shielded substation can be equipped with two insertion resistors each disposed inside a conducting bar 4A, 4B each cooperating with a breaking subassembly 2A, 2B to reduce the amplitude of the overvoltages injected into the electrical network when closing the circuit breaker of the substation. Such a modification to obtain a station according to the invention can be carried out without having to modify the dimensions of the stations, in particular from the moment when each hollow busbar 4A, 4B has an interior space sufficient to accommodate the resistance of the station. desired insertion. Thus, according to the invention, each resistance insertion is housed in a hollow bar which plunges into the tank of a circuit breaker to form an angle with the axial direction AX of the circuit breaker.

The figure 2 is a more detailed representation of a conductive bar 4B which substantially defines a hollow tubular shape. The insertion resistor 6B which here has a cylindrical shape is mounted inside the conductive bar 4B being disposed substantially coaxially therewith.

In the example given figure 2 , the insertion resistor is electrically isolated from the conductive bar by the dielectric gas contained in the shielded substation envelope. However, it is conceivable to have a cylindrical insertion resistor 6B of larger diameter and electrically insulated from the conductive bar by a solid insulating layer.

The insertion resistance is maintained centered inside the conductive bar 4B by two insulating parts 7 and 8 respectively mounted at each end of the conductive bar 4B. The centering piece 8 here consists of an insulating cone, and is located at the lower end of the conductive bar 4B. It is fixed on its periphery to the inner surface of the conductor bar being traversed at its center by a conductive rod 9 located in the extension of the insertion resistance. This conductive rod 9 is electrically connected to the lower end of the insertion resistor 6B.

As visible on the figure 3 , the lower end of the conductor bar and the insertion resistor are electrically connected to an inserter 10 which extends along the longitudinal axis AX which is also the axis of displacement of the moving contacts of the sub-assemblies cutoff 2A and 2B. This inserter 10 cooperates with a mobile contact equipment of the breaking subassembly 2B. This mobile contacting equipment comprises a conducting rod which is provided, at its end facing the inserter, with a first arcing contact 11 'which here has the shape of a tulip. It also comprises a tubular portion which is fixed to the rod coaxially and which is adapted to be connected to a housing of the inserter 10 to ensure the passage of the permanent current as explained below. In what follows, the mobile contact crew is called mobile contact 11.

More particularly, the inserter 10 is mounted inside a casing 17 which is fixed to the lower end of the conductive bar 4B in the example embodiment of the figure. This casing 17 is thus electrically connected to the conductive bar 4B. However, it is possible to envisage additional means for fixing the casing 17 in the tank 4, for example by means of at least one insulating support between the casing and the tank, and to provide the electrical connection between the casing and the busbar by connection means which do not necessarily ensure a single support function of the housing.

The conductive rod 9 which extends the insertion resistance penetrates into the volume of the housing 17 through an opening in the housing, to be electrically connected to a first movable support 14 via a tubular sliding contact member 15 which is fixed and electrically connected to the conductive rod 9. In what follows, the second fixed support of the inserter means that element 15 which is intended to form a sliding contact with the first mobile support 14 while partially supporting it this mobile support 14 ensuring a movable contact function of the inserter 10.

A fixed contact 12 of the breaking subassembly 2B, which comprises a second arcing contact 12 'at its end facing the movable contact 11, is fixed to the casing 17 via an electrically insulating piece 18 while being positioned along the AX axis. The second arcing contact 12 'is thus electrically isolated from the hollow bar as long as it is separated from the first arcing contact 11', or as long as the insertion resistor is not short-circuited as explained above. far. The inserter 10 coaxially surrounds the fixed contact 12 by being arranged to electrically connect the movable contact 11 of the breaking subassembly 2B to the conductive rod 9 during the occurrence of an electric arc between the arcing contacts 11. and 12 'for the current to flow through the insertion resistor 6B, which corresponds to the state shown figure 3 . The inserter 10 is also arranged to electrically connect the movable contact 11 to the conductive bar 4B so that the electric current passes through the busbar at the end of the closing of the inserter, which corresponds to the state represented in FIG. figure 4 .

As visible in figures 3 and 4 the movable contact 11 of the breaking subassembly 2B comprises a piece 13 of insulating material which surrounds its end made of the arc contact 11 'and which bears against a first mobile support 14 of the inserter. This first mobile support 14 has a substantially cylindrical shape that surrounds the fixed contact 12 to which it is electrically connected. This support 14 is able to move in translation along the axis AX when it is driven in movement by the piece 13 against a return spring 14 ', and is also free to slide at the inside the second fixed support 15.

The second fixed support 15 is held in position by the conductive rod 9, and has a substantially cylindrical shape which surrounds the first movable support 14 to leave it free to slide along the axis AX ensuring sliding electrical contact. Thus, the insertion resistance is electrically connected to the second arcing contact 12 'at the end of the fixed contact 12 of the circuit breaker via the conductive rod 9, the second fixed support 15, and the first movable support 14 of the inserter 10.

With this arrangement, the inserter 10 can be fixed at the bottom end of the conductive bar while being electrically connected on the one hand to this conductive bar through its housing 17, and on the other hand to the insertion resistor.

On closing of the circuit breaker, the first arcing contact 11 'is approached to the second arcing contact 12', which causes the appearance of an arc between these two contacts. The arc current then passes through the fixed contact 12, then the first movable support 14 and the second fixed support 15 of the inserter to reach the insertion resistance through the conducting rod 9, as visible on the figure 3 .

After the first arcing contact 11 'has begun to cover the second arcing contact 12', the movable carrier 14 of the inserter contacts a fixed contact 16 of the inserter which is attached to the housing 17 to be electrically connected to the conducting bar 4B, which corresponds to the state represented on the figure 4 . The insertion resistance is then short-circuited, since the second arcing contact 12 'becomes electrically connected to the hollow bar 4B via the first movable support 14, the fixed contact 16 and the casing 17 of the inserter .

The fixed contact 16 is mounted in the axial direction AX, and comprises a tubular portion which is in contact with the cylindrical inner wall of the housing 17. At the end of closing of the circuit breaker, the movable contact 11 continues its travel to reach a position not shown in which its end is fitted into the housing 17. Thus, the movable contact is electrically connected to the housing so as to substantially increase the contact section to ensure the passage of the permanent current to the conductor bar by shorting the circuit breaker insertion resistor when the circuit breaker is in the closed position. It is recalled that the permanent current is generally defined as the rated current that the station is able to transit.

The presence of a mobile support 14 associated with a fixed contact 16 for the inserter is not essential in a shielded station according to the invention, but is generally preferable in order to be able to short-circuit the insertion resistance before the Permanent current flows between the movable contact 11 and the conductive bar 4B through the casing 17 of the inserter.

The invention can be applied to other types of circuit breakers, in particular circuit breakers type single-chamber cutoff, that is to say having a single sub-cutoff assembly such as 2A or 2B and a single inserter.

Claims (7)

1. A high-voltage shielded substation comprising at least one circuit breaker which is enclosed by a case (4) which extends according to an axial direction (AX), said circuit breaker being linked to an electrically conductive hollow bar (4B) for passage of permanent current in the substation, said hollow bar being electrically connected to a mobile contact (11) of the circuit breaker when the circuit breaker is in the closed position for passage of permanent current, said mobile contact (11) comprising at one end a first arc contact (11'), a closure resistor (6B) being placed inside said bar and electrically connected to the circuit breaker via an inserting appliance (10), characterised in that said hollow bar dips into said case to form an angle with the axial direction (AX), and in that said closure resistor is electrically connected to a second arc contact (12') of the circuit breaker via said inserting appliance (10), said second arc contact being electrically insulated from said hollow bar (4B) at least while it is separated from said first arc contact (11').
2. The shielded substation as claimed in Claim 1, in which said inserting appliance (10) is mounted inside a casing (17) which is fixed to an end of said conductive bar (4B), said casing being arranged to electrically connect said bar to the mobile contact (11) of the circuit breaker when the latter is in the closed position.
3. The shielded substation as claimed in any one of Claims 1 and 2, in which said inserting appliance (10) comprises a sliding contact (14, 15) connected both to said closure resistor (6B) and also to a fixed contact (12) extended by the second arc contact (12') of the circuit breaker, said sliding contact being constituted by a first cylindrical support (14) which is mobile according to the axial direction (AX) able to slide in a second support (15) which is fixed.
4. The shielded substation as claimed in Claim 3, in which said second fixed support (15) of the inserting appliance (10) is connected by a conductive rod (9) to the closure resistor (6B).
5. The shielded substation as claimed in any one of Claims 3 and 4, in which the first cylindrical support (14) of the inserting appliance (10) is arranged to make contact, at the end of a stroke of the inserting appliance, with a fixed contact (16) electrically connected to said conductive bar (4B).
6. The shielded substation as claimed in Claim 5, in which the casing (17) of the inserting appliance has a substantially tubular form according to the axial direction (AX) of the case (4), and in which said fixed contact (16) is mounted according to this axial direction and is arranged to be in electrical contact with the inner wall of said casing.
7. The shielded substation as claimed in any one of Claims 1 to 6, in which said hollow bar (4B) forms a right angle with the axial direction (AX) of the case (4) and is enclosed by a cylindrical ferrule (5B) fixed to a corresponding clip of the case.

Images