Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
  • H01H3/3005—Charging means
  • H01H3/3026—Charging means in which the closing spring charges the opening spring or vice versa
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
  • H01H3/3052—Linear spring motors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
  • H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
  • H01H2003/268—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor using a linear motor
• • 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
  • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
  • H01H33/36—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor

Definitions

• the present invention relates to a device for controlling a device for cutting off high or medium voltage electrical energy.
• electrical cut-off device it is understood here generally a circuit breaker, a disconnector or a grounding device.
• a control device is notably described in the documents WO 00/05735, WO 96/36922, or also DE 913 665.
• the invention poses the problem of presenting a circuit breaker control device provided with an improved arrangement for ensuring setting and maintaining the movable contact in the closed position, in particular by integrating a mixed solution which makes it possible to use a standard control assistance motor, together with a mechanical spring arrangement participating in the opening and closing of the contact.
• the invention relates to a circuit breaker control device intended to open and close this electrical energy cut-off device comprising a movable contact, this control device comprising a motor with a rotary output shaft and being connected to supply means and actuation means transforming the displacement at the outlet of the motor in displacement of the contact, device also comprising a mechanical spring arrangement participating in the opening and closing of the contact, the spring arrangement comprising two prestressed and antagonistic mechanical springs, a first spring called opening spring ensuring the opening of the contact and a second spring called closing spring ensuring the closing of the contact, the actuation means being urged by each of these two springs separated by a ring, and comprising an immobilization arrangement in the open position and in the position of closing said contact.
• the actuating means comprise a set of articulated elements ensuring the connection of the rotary shaft and the ring, and, in the closed position of the contact, the set of articulated elements is in abutment against an abutment element near a neutral position known as opening dead center, the opening spring being able to drive it towards the opening position only when this dead center is exceeded during an opening.
• the movable contact when the movable contact is in the closed position, it is maintained in this position due to the fact that the set of articulated elements to which it is linked is blocked in one direction by its stop against the stop element, and also in the other direction of the fact that it has exceeded the opening dead center and that the opening spring can no longer cause displacement.
• a standard motor can be used without the need for further development for this application.
• a low voltage converter can be used with a bank of supercapacitors as storage means.
• the invention has the following advantages thanks to the presence of the motor.
• the number of moving parts and mechanism links is considerably reduced. This implies less friction loss and therefore the use of smaller springs. This also results in less frequent and less heavy maintenance.
• the circuit breaker is always available and does not require a pause time after a given cycle of openings and closings.
• the springs do not need to be recharged.
• Closing the circuit breaker can be as fast as opening because the mechanical energy contained in the closing spring when the circuit breaker is in the open position is equal to that of the opening spring when the circuit breaker is in the closed position.
• said motor is a motor for assisting and controlling the trajectory of said contact supplied by a power converter controlled by a position and speed regulator.
• said regulator provides damping of the displacement of said contact at the end of opening stroke and at the end of closing stroke. Thanks to the servo motor, there is no longer any need for a end-of-travel damper, since the motor provides, by its servo-control, the damping necessary to arrive at zero speed at the end of the race.
• the closed loop control of the trajectory increases the robustness of the circuit breaker with regard to parametric variations such as, for example, the variation of the stiffness of the springs or the viscosity of the gas contained in the breaking chamber as a function of the temperature.
• said springs are mounted aligned along an axis, one of their respective ends being in abutment against a spring stop and their opposite ends being separated by said ring.
• said set of articulated elements comprises a crank driven in rotation by said output shaft and articulated at one end of a connecting rod whose other end is articulated on said ring.
• said set of articulated elements in the open position of said contact, is close to a neutral position known as dead center for closing, the closing spring being able to drive it towards the closed position only when it exceeds from this dead center during a closing.
• the closing spring being able to drive it towards the closed position only when it exceeds from this dead center during a closing.
• said connecting rod has a U-shaped end ensuring its partial rotation around the axis of rotation of said crank.
• Said crank can be rotated by said output shaft by means of a toothed sector meshed on said output shaft and on which it is articulated.
• it includes an arrangement for disengaging the action of the closing spring.
• said declutching arrangement consists of a device for controlled displacement of said stop of the closing spring.
• the control device comprises a device for pushing said set of articulated elements towards its opening dead center.
• Said thrust device may consist of a striker intended to urge said crank.
• FIG. 1 is a view in longitudinal section of a control device according to a preferred embodiment of the present invention, in the closed position of the movable contact;
• Figure 2 is a longitudinal sectional view of a control device according to this preferred embodiment, in the open position of the movable contact;
• Figure 3 is a longitudinal sectional view of a variant of this embodiment, in the closed position of the movable contact.
• FIGS. 1 and 2 show a circuit breaker provided with a control device according to an embodiment of the present invention.
• This circuit breaker comprises a motor 3 for assisting and controlling the trajectory of a movable contact (not shown) intended to cooperate with a fixed contact, here a motor 3 with a rotary shaft 12, connected to supply means.
• these supply means comprise a power converter 4 controlled by a position and speed regulator 5 thanks to a sensor 6 associated with the motor 3.
• the regulator 5 provides damping of the displacement of the movable contact at the end of the travel d 'opening and end of closing stroke.
• a capacity bench 7 provides the instantaneous power necessary for the supply of the converter 4.
• the management of the recharging of the capacities is carried out by a charging unit 8 connected to a continuous or alternating electrical network.
• An input and output unit 9 manages the speed and position references according to the opening or closing orders of the circuit breaker. If we refer to the direction seen according to Figures 1 and 2, the axis AA 'of the control device is shown in a vertical position and the rotary shaft 12 of the motor 3 is arranged perpendicular to this axis. These relative provisions are exemplary embodiments, any other provision that may be envisaged.
• the movable contact of the circuit breaker is not shown and is connected in a manner known per se to a crank 14 rotating around an axis B parallel to the rotating shaft 12 and offset from the axis AA '.
• the drive of the crank 14 is carried out by means of a toothed sector 13 also rotatable around the axis B, articulated on the crank 14 and meshed on the output shaft 12.
• the drive can be carried out by direct centering of the shaft 12 on the axis B.
• the mechanical spring arrangement comprises two prestressed mechanical springs, a first spring 15 said opening spring ensuring the opening of said contact and a second spring 16 said closing spring ensuring the closing of said contact, these two springs being antagonistic and of substantially identical stiffness.
• the preload of the two springs allows sufficient energy in the opening spring to execute an opening maneuver when the closing spring is released. It also ensures their mechanical stability when the springs are in the equilibrium position.
• the actuating means are biased by each of these two springs 15, 16 and comprise a set of articulated elements abutting against a stop element 19 in the open or closed position.
• These mobile / articulated elements are said crank 14 articulated at a first end of a connecting rod 17 whose other end is articulated on a ring 18.
• This connecting rod 17 preferably has a U-shaped end ensuring its partial rotation about the axis of rotation B of the crank 14.
• the springs 15, 16 are mounted aligned along the axis A-A ', one of their respective ends being in abutment against a spring stop 15A, 16A and their opposite ends being separated by said movable ring 18.
• the movable contact is in the open position, in a configuration as shown in FIG. 2.
• the motor 3 is active on a stroke corresponding to the overshoot of neutral point specified above.
• the transfer of mechanical energy is then carried out as soon as this neutral point passes from the closing spring 16 to the opening 15, the mechanical energy being transformed into kinetic energy and compressing the opening spring 15.
• the motor 3 ensures the control of the path of the movable contact so that it reaches the end of the closing stroke at zero speed, as shown in FIG. 1.
• the control device may comprise an arrangement for disengaging the action of the closing spring 16. This alternative is shown in FIG. 3.
• This disengagement arrangement consists of a device for controlled displacement of the stop 16A of the closing spring 16.
• this stop 16A can be slid in a cylindrical guide 20 downwards, seen according to FIG. 3.
• This movement is controlled by means of an arrangement of gears 21 meshed on a toothed rod 22 integral of the stop 16A in question.
• This arrangement of gears 21 maintains the stop 16A in the upper position as shown in FIG. 3, in normal operation.
• this declutching arrangement is put into operation and the stop 16A lowered.
• the force of the preloaded closing spring 16 added to the gravitational force, eliminates any action of the closing spring 16. No action then takes place against the action of the opening spring 15.
• a striker 23 is also provided, arranged to be able to operate the crank 14 so that it exceeds its upper dead center.
• This striker 23 consists of a system transforming electrical energy into mechanical energy. It can be a coil actuating a lock releasing a spring or a solenoid. Once the motor 3 is back in operation, the closing spring 16 is again compressed by raising the stop 16A and the control device can resume normal operation.
• This striker 23 consists of a system transforming electrical energy into mechanical energy. It can be a coil actuating a lock releasing a spring or a solenoid.

Landscapes

• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Mechanisms For Operating Contacts (AREA)
• Emergency Protection Circuit Devices (AREA)
• Control Of High-Frequency Heating Circuits (AREA)
• Protection Of Static Devices (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Control Of Linear Motors (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34717487

Family Applications (1)

Country Status (8)

Cited By (2)

Families Citing this family (12)

Citations (4)

Family Cites Families (8)

• 2004
  • 2004-01-23 FR FR0450124A patent/FR2865572B1/fr not_active Expired - Fee Related
• 2005
  • 2005-01-20 AT AT05717675T patent/ATE425546T1/de not_active IP Right Cessation
  • 2005-01-20 WO PCT/FR2005/050030 patent/WO2005076303A1/fr not_active Ceased
  • 2005-01-20 DE DE602005013186T patent/DE602005013186D1/de not_active Expired - Lifetime
  • 2005-01-20 EP EP05717675A patent/EP1706880B1/fr not_active Expired - Lifetime
  • 2005-01-20 US US10/586,295 patent/US7642478B2/en not_active Expired - Fee Related
  • 2005-01-20 CN CN2005800027925A patent/CN1910714B/zh not_active Expired - Fee Related
  • 2005-01-20 JP JP2006550252A patent/JP4563405B2/ja not_active Expired - Fee Related

Patent Citations (4)

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