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
  • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
  • H01H33/16—Impedances connected with contacts
  • H01H33/165—Details concerning the impedances
• • 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
  • H01H33/025—Terminal arrangements

Definitions

• High-voltage shielded substation comprising a circuit breaker with an insertion resistor mounted in a busbar
• 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.
• a shielded station is described for example in the French patent document FR2784500.
• the circuit breaker is placed inside an enclosure and the insertion resistance (also called closing resistance) is mounted at one end of the enclosure inside a tank fixed to the '' with a flange.
• the insertion resistance also called closing resistance
• Other configurations exist where the insertion resistance and its reservoir are arranged in parallel with the casing of the circuit breaker.
• the insertion resistance is arranged inside the enclosure of the station coaxially with the axis of the circuit breaker, and is surrounded at a distance by a metal cylinder which electrically connects an arcing contact to a pole of the circuit breaker.
• the station is however insulated in air unlike a so-called shielded station, since it comprises an insulating envelope which supports the two poles and contains the insulating gas.
• shielded substations there are equivalent configurations in shielded substations, the pole of the circuit breaker in question then being extended by a conductive bar surrounded at a distance by the metal casing of the substation.
• An object of the invention is to remedy the large size of conventional shielded stations having insertion resistors housed longitudinally in the metal casing of the station, by proposing a more compact shielded station in the longitudinal direction.
• the subject of the invention is an armored high-voltage substation comprising at least one circuit breaker which is surrounded by a tank 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 movable contact of the circuit breaker when the circuit breaker is in the closed position for passage of the permanent current, this movable contact comprising at one end a first arcing contact, an insertion resistance being placed inside the hollow bar and electrically connected to the circuit breaker by an inserator, characterized in that the hollow bar plunges into the tank 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
• the inserter is mounted inside a casing which is fixed to one end of the busbar, this casing being arranged to electrically connect the bar to the moving contact of the circuit breaker when the latter is in the closed position.
• the inserter comprises a sliding contact connected on the one hand to the insertion resistance 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 being able to slide in a second support which is fixed.
• This second fixed support is preferably connected by a conductive rod to the insertion resistance.
• the first cylindrical support of the inserter is arranged to come into contact, at the end of the travel of the inserter, with a fixed contact electrically connected to the busbar.
• FIG. 1 is an overall view of an armored substation comprising two circuit breaker breaking sub-assemblies, and which can advantageously be transformed into a substation according to the invention
• Figure 2 is a schematic view of an end portion of a shielded post according to the invention obtained on the basis of a post similar to that shown in Figure 1, an insertion resistor being mounted at the interior of a hollow conductive bar which forms a pole of the station
• Figure 3 is a schematic representation of the inserter equipping the station according to the invention during the closing of the circuit breaker;
• Figure 4 is a schematic representation of the inserter equipping the station according to the invention in a closed state of the circuit breaker.
• the shielded station includes among other things a metal casing 1 which surrounds a circuit breaker extending in a longitudinal direction AX.
• the circuit breaker comprises two breaking sub-assemblies 2A and 2B arranged on either side of an actuator 3.
• the breaking sub-assemblies 2A, 2B are spaced along the longitudinal direction AX which is here horizontal , and each of them is electrically connected to a corresponding hollow conductive bar 4A, 4B which is here vertical.
• Each bar 4A, 4B is surrounded by a vertical cylindrical part of the metal casing 1.
• the metal casing 1 comprises a tank 4 which surrounds the circuit breaker, as well as two ferrules 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 tap of the tank 4.
• this shielded station can be equipped with two insertion resistors each disposed inside a conductive bar 4A, 4B each cooperating with a breaking sub-assembly 2A, 2B to reduce the amplitude of the overvoltages injected into the electrical network when the station circuit breaker is closed.
• a modification to obtain a station according to the invention can be carried out without having to modify the dimensions of the station, in particular from the moment when each hollow conductive bar 4A, 4B has sufficient internal space to accommodate the resistance of desired insertion.
• each resistance insert 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.
• 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 by being arranged substantially coaxial therewith.
• the insertion resistance is electrically isolated from the busbar by the dielectric gas contained in the envelope of the shielded station.
• a cylindrical insertion resistance 6B of larger diameter and electrically insulated from the busbar by a layer of solid insulation it is possible to envisage having a cylindrical insertion resistance 6B of larger diameter and electrically insulated from the busbar by a layer of solid insulation.
• the insertion resistance is kept centered inside the conductive bar 4B by two insulating parts 7 and 8 mounted respectively 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 internal surface of the conductive bar while being crossed in 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 resistance 6B.
• the lower end of the busbar and of the insertion resistance are electrically connected to an inserter 10 which extends along the longitudinal axis AX which is also the axis of movement of the movable contacts of the breaking sub-assemblies 2A and 2B.
• This inserter 10 cooperates with a moving contact assembly of the cut-off sub-assembly 2B.
• This movable contact assembly comprises a conductive rod which is provided, at its end oriented towards the inserter, with a first arcing contact 11 ′ which here has the shape of a tulip.
• the moving contact assembly is called moving contact 11. More particularly, the inserter 10 is mounted inside a casing 17 which is fixed to the lower end of the busbar 4B in the 'example of realization of the figure. This casing 17 is thus electrically connected to the busbar 4B.
• additional means of fixing the casing 17 in the tank 4 for example using at least one insulating support between the casing and the tank, and ensuring the electrical connection between the casing and the busbar by connection means which do not necessarily alone provide a housing support function.
• the conductive rod 9 which extends the insertion resistance enters the volume of the housing 17 through an opening in the housing, to be electrically connected to a first movable support 14 by means of a tubular sliding contact element 15 which is fixed and electrically connected to the conductive rod 9.
• the second fixed support of the inserator designates this element 15 which is intended to form a sliding contact with the first mobile support 14 while supporting it in part , this mobile support 14 ensuring a mobile contact function of the inserter 10.
• a fixed contact 12 of the breaking sub-assembly 2B which comprises a second arcing contact 12 ′ at its end oriented towards the movable contact 11, is fixed to the casing 17 by means of an electrically insulating part 18, being positioned along the axis AX.
• 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 even as long as the insertion resistance is not short-circuited as explained more far.
• the inserter 10 coaxially surrounds the fixed contact 12, being arranged to electrically connect the movable contact 11 of the breaking sub-assembly 2B to the conductive rod 9 during the appearance of an electric arc between the arcing contacts.
• the inserter 10 is also arranged to electrically connect the movable contact 11 to the busbar 4B so that the electric current crosses the conductive bar at the end of closing of the inserter, which corresponds to the state shown in FIG. 4.
• the movable contact 11 of the cut-off sub-assembly 2B comprises a piece 13 of insulating material which surrounds its end constituted by the arcing contact 11 'and which is in abutment against a first movable support 14 from the inserter.
• This first mobile support 14 has a substantially cylindrical shape which 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 part 13 against a return spring 14 ', and is also free to slide 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 mobile support 14 to leave it free to slide along the axis AX, ensuring sliding electrical contact.
• the insertion resistor 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 mobile support 14 of the '' inserter 10.
• the inserter 10 can be fixed at the lower end of the conductive bar while being electrically connected on the one hand to this conductive bar through its casing 17, and on the other hand to the insertion resistance.
• the first arcing contact 11 ' 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 arcing current then passes through the fixed contact 12, then the first mobile support 14 and the second fixed support 15 of the inserter to reach the insertion resistance through the conductive rod 9, as visible in FIG. 3.
• the movable support 14 of the inserter comes into contact with a fixed contact 16 of the inserter which is fixed to the casing 17 to be electrically connected to the busbar 4B, which corresponds to the state shown in 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 part which is in contact with the cylindrical inner wall of the casing 17.
• the movable contact 11 continues its course to reach a position not shown in which its end is fitted into the casing 17.
• the movable contact is electrically connected to the casing so as to significantly increase the contact section to ensure the passage of the permanent current to the busbar by short-circuiting the circuit breaker insertion resistance when the circuit breaker is in the closed position.
• the permanent current is generally defined as the nominal current that the station is able to pass through.
• a mobile support 14 associated with a fixed contact 16 for the inserter is not essential in a shielded post according to the invention, but is generally preferable in order to be able to short-circuit the insertion resistance before the permanent current does not flow between the movable contact 11 and the busbar 4B via the casing 17 of the inserter.
• the invention can be applied to other types of circuit breakers, in particular circuit breakers of the single-chamber breaking type, that is to say comprising a single breaking sub-assembly such as 2A or 2B and a single inserter.

Landscapes

• Arc-Extinguishing Devices That Are Switches (AREA)
• Circuit Breakers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=29595161

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (3)

• 2002
  • 2002-06-12 FR FR0207203A patent/FR2841039B1/fr not_active Expired - Fee Related
• 2003
  • 2003-06-06 WO PCT/FR2003/001699 patent/WO2003107370A1/fr not_active Application Discontinuation
  • 2003-06-06 EP EP03760002A patent/EP1512160B1/de not_active Expired - Lifetime
  • 2003-06-06 AU AU2003255648A patent/AU2003255648A1/en not_active Abandoned
  • 2003-06-06 DE DE60336311T patent/DE60336311D1/de not_active Expired - Lifetime
  • 2003-06-12 TW TW92115997A patent/TW200405376A/zh unknown

Non-Patent Citations (1)

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