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
  • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
  • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
  • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic

Definitions

• the invention relates to a hydromechanical drive for electrical circuit breaker with a hydraulic cylinder-piston arrangement for acting on the electric circuit breaker, with at least one Mehrwege- switching valve, with an integrated damping device, with a memory for hydraulic pressure fluid and with an energy storage, preferably of at least a disc spring assembly is formed, which cooperates with one or more memory modules.
• hydro-mechanical spring-loaded actuators usually work together with a 2/3-way poppet valve and are formed in a modular manner from the components charging module, working module, memory module, monitoring module and control module. Due to the modular design, the field of application of the drives is significantly expanded.
• the working module has an integrated damping for the switch-on and Ausschalttraum and is essentially acted upon by a spring-loaded memory, which acts on one or more memory modules.
• the known hydro-mechanical spring-actuated drive is adapted with regard to the required drive energy or the nominal switching sequence, this leads to an expansion of the component requirement in the existing designs.
• the known integrated damping must be adapted to the respective application. For this purpose, it has always been necessary to determine the respectively responsible for the damping components by trying to adjust the applicable damping characteristics, which increases the manufacturing effort in terms of time and material, as in the existing drives, the adjustment of the damping from the outside is not possible.
• Another disadvantage is that the measurement of each set damping and thus a secure control of compliance with the specified requirements from the outside is not possible.
• the invention provides that the hydromechanical drive is provided with at least two multi-way switching valves, which are designed as 2/2-way valve, and that the hydraulic control of the drive is adapted thereto.
• the otherwise previously required effort to control the circuit breaker is significantly reduced, since this standardized components can be used and not specially adapted, related to the particular order custom-made are required.
• a preferred embodiment of the hydromechanical drive according to the invention provides that the 2/2-way valves are each assigned separately with them. th memory modules work together as energy storage, whereby the possibility of a higher switching performance is given.
• An advantageous alternative of the hydromechanical drive according to the invention is characterized in that to increase the drive energy at least one further memory module is connected in parallel, which is not possible with conventional switchgear, but must be planned from the outset.
• At least one further memory module is connected in parallel for expanding the nominal switching sequence.
• This additional function increase requires a corresponding advance planning in conventional switching drives, otherwise a subsequent adaptation of the nominal switching sequence is not or only a lot of effort can be realized.
• the drive according to the invention is characterized in that the actuation of the valves is provided in each case by means of control cam of a camshaft.
• the camshaft may preferably be actuated electrically, for example by means of a stepping motor, or instead of an electric drive, the camshaft may be mechanically actuated, for example via a transmission.
• the drive for actuating the camshaft can be designed hydraulically or hydromechanically.
• control cams are rotationally actuated.
• control cams are translationally actuated instead.
• the outer contour of the control cam is predetermined, that is, according to the outer contour of the control cam is the Actuation of the switching on or off of the hydraulic drive inducing respect to the time course.
• control cam are provided with a defined contour, which specifically controls the switching behavior of the 2/2-way poppet valves.
• Another advantageous feature of the hydromechanical drive according to the invention is characterized in that the respective cam position is maintained at the end of a switching operation. This ensures that a subsequent switching operation is immediately possible without first a switching position must be approached first.
• each storage module serving as energy storage is advantageously formed by at least one spring assembly, which preferably consists of disc springs, which is preferably designed as a disc spring column.
• the single figure is a circuit diagram for a hydromechanical drive for an electrical circuit breaker.
• the single FIGURE shows a circuit diagram for a hydromechanical drive 10 for an electrical power switch 12, which shows the mode of action or the components belonging to the hydromechanical drive 10 in their respective functional assignment.
• a hydromechanical drive 10 for an electrical power switch 12 shows the mode of action or the components belonging to the hydromechanical drive 10 in their respective functional assignment.
• the circuit breaker 10 to be actuated is shown in simplified form as an electrical circuit symbol. Its movable contact member 14 is acted upon by a connected to a hydraulic piston 20 in a hydraulic piston 18, which is designed as a differential piston piston rod 16 both to open the switch contact 14 of the circuit breaker 10 and to its closure.
• This hydraulic cylinder 20 which forms the core of the hydromechanical drive 10, has a total of four connections 20.1, 20.2, 20.3 and 20.4 for connecting fluid lines for the supply or removal of fluid.
• the guided in it piston 18 is designed as a differential piston. Accordingly, the hydraulic cylinder 20 has a cylinder space 21.1 and a cylinder space 21.2.
• the cylinder space 21.1 absorbs the fluid to turn off the electric circuit breaker 12; the cylinder space 21.2 is filled with fluid when the electric power switch 12 is to be turned on.
• first pressure line 22 is in each case fluidly connected via a first pressure line 22 and via a first outlet line 24 with a first also shown only as a symbol 2/2-way valve 26, which is actuated via a switching rod 27.1 by a first control cam 28 of a camshaft 30.
• hydraulic cylinder 20 is further connected via a second outlet line 32 and a second pressure line 34, a second also shown as a symbol 2/2-way valve 36 which is also actuated via a shift rod 37.1 of a second control cam 38 of the camshaft 30.
• the cams 28, 38 are offset by 90 ° relative to one another, so that the actuation of the two 2/2-way valves 26, 36 is synchronous, that is, at the same time, however in reverse.
• Required valve positions of the two 2/2-way valves 26, 36 which feed or discharge the control fluid accordingly.
• the following explanations relate to the achievement of the reproduced in the single figure open position of the switching contact 14 of the circuit breaker 12.
• the camshaft control is controlled so that the first cam 28 occupies the position shown in which he with his flat side, the shift rod 27.1 applied.
• the fluid channel in the valve 26.1 is opened in the 2/2-way valve 26, so that pressurized fluid from an energy store 40 via a pressure line 42 to the valve 26.1 and flows unhindered from there via the pressure line 22 to the port 20.1 of the hydraulic cylinder 20, thereby occupying the piston 18 in the end position shown on the cylinder bottom of the hydraulic cylinder 20.
• valve 26.2 of the 2/2-way valve 26 is opened so that the fluid previously located in the cylinder chamber 21.2 from the piston 18 moving to the cylinder bottom via the line 24 through the valve 26.2 via a line 44 to a low pressure tank for the fluid can escape.
• a controllable throttle 48 is installed, which is to ensure a controlled discharge of the fluid from the cylinder 20 to the low-pressure vessel 46.
• the outlet line 32 is connected to the port 20.3, through which the fluid in the cylinder 20 during the switch-on, that is, when the cylinder chamber 21.2 is filled with fluid, can flow out.
• a controllable throttle 49 is installed, which ensures a controlled flow of fluid, so that the closing operation of the electric circuit breaker 12 takes place with the required precision.
• the outlet provided with the controllable throttle 49 is guided to the valve block 36.2 of the 2/2-way valve 36, which is connected via a line 50 with a low-pressure tank 52.
• the low-pressure tank 49 in turn is connected via a further line 54, in which a ND filter 56 is arranged, with a pump 57 operated by a motor 57.
• the outlet line 34 is connected to the port 20.4, which is connected to the valve block 36.1 of the 2/2-way valve 36.
• the valve in the valve block 36.1 is open in this case so that pressurized fluid can flow from an energy store 60 via a line 62 to the valve 36 and thus to the cylinder space 21.2.
• the control of the 2/2-way valve 36 was carried out in a corresponding manner as well as the 2/2-way valve 26 by applying a cam 38th
• the aforementioned pump which is connected via lines 64, 68 to the pressure accumulators 40, 60 and these each supplied with pressurized fluid.
• the lines 64, 68 are each provided with a check valve 66, which holds the pressure fluid present in the energy storage devices 40, 60 at the required pressure level.
• a connecting line of the LP tank 46 with the LP tank 52 from which the common line 54 is guided with the interposition of the LP filter 56 to the pressure pump 58 for the fluid.

Landscapes

• Fluid-Pressure Circuits (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=42224832

Family Applications (1)

Country Status (5)

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• 2009
  • 2009-04-01 DE DE102009015881A patent/DE102009015881A1/de not_active Withdrawn
• 2010
  • 2010-03-12 EP EP10710204A patent/EP2415059A1/de not_active Withdrawn
  • 2010-03-12 CN CN2010800158068A patent/CN102379019A/zh active Pending
  • 2010-03-12 WO PCT/EP2010/001559 patent/WO2010112130A1/de active Application Filing
  • 2010-03-12 KR KR1020117023079A patent/KR20110137334A/ko not_active Application Discontinuation

Non-Patent Citations (1)

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