EP3965130A1 - Schaltsystem - Google Patents

Schaltsystem Download PDF

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Publication number
EP3965130A1
EP3965130A1 EP20194853.6A EP20194853A EP3965130A1 EP 3965130 A1 EP3965130 A1 EP 3965130A1 EP 20194853 A EP20194853 A EP 20194853A EP 3965130 A1 EP3965130 A1 EP 3965130A1
Authority
EP
European Patent Office
Prior art keywords
motor
spring
rotate
switching system
thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20194853.6A
Other languages
English (en)
French (fr)
Inventor
Dietmar Gentsch
Christian Reuber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP20194853.6A priority Critical patent/EP3965130A1/de
Priority to CN202111040220.3A priority patent/CN114156143A/zh
Publication of EP3965130A1 publication Critical patent/EP3965130A1/de
Pending legal-status Critical Current

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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
    • H01H3/3042—Power arrangements internal to the switch for operating the driving mechanism using spring motor using a torsion spring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • 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
    • 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
    • H01H33/40—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/66—Power reset mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/66—Power reset mechanisms
    • H01H71/70—Power reset mechanisms actuated by electric motor

Definitions

  • the present invention relates to a switching system that comprises a low, medium or high voltage switch (such as a circuit breaker or that forms part of a circuit breaker) and a charging device, as well as to a low, medium or high voltage switchgear that comprises such a switching system.
  • a low, medium or high voltage switch such as a circuit breaker or that forms part of a circuit breaker
  • a charging device such as a circuit breaker or that forms part of a circuit breaker
  • MV circuit breakers are driven by a mechanical drive that contains a main spring to store and release the energy for an operation.
  • the main spring can either be charged manually or by use of an electric drive, usually an electric motor. This also applies to low and high voltage circuit breakers and other switching systems.
  • the electric motor requires some mechanism or means to switch it on when it is needed to charge the spring and to switch it off when the spring is charged.
  • This control of the switching on and off of the motor to turn the motor on to charge the spring when required and to turn the motor off when the spring is charged is via a mechanism that checks the mechanical position of the spring. This is control of the motor is therefore via an additional mechanism that increases the complexity of the CB drive system, and that could potentially fail.
  • a switching system comprising a low, medium or high voltage switch and a charging device, comprising:
  • a first end of the main spring is connected to the spring support.
  • a second end of the main spring is connected to the main shaft.
  • the spring support is configured to rotate about an axis of the main shaft. At least part of a circumference of the spring support comprises a thread.
  • the motor comprises a worm thread configured to engage with the thread of the spring support. The motor is configured to rotate the worm thread. Rotation of the worm thread is configured to rotate the spring support to store energy in the main spring. The motor is configured not to rotate the worm thread when the energy stored in the main spring has reached a threshold level. Energy release from the main spring is configured to rotate the main shaft.
  • the spring support comprises a cup.
  • At least part of an outer circumference of the spring support comprises the thread.
  • a mounting of the motor is configured to enable the motor to move.
  • the motor is configured not to rotate the worm thread when the motor has moved a threshold distance.
  • the mounting of the motor comprises a spring configured to resist the movement of motor to the threshold distance.
  • movement of the motor to the threshold distance is configured to trigger a switch to stop the motor from rotating the worm thread.
  • a simple microswitch or switch can be triggered based on a lateral movement of the motor then turns the motor off.
  • the motor comprises at least one power connection.
  • the at least one power connection of the motor is configured to be in electrical connection with at least one fixed connection to provide power to the motor to rotate the worm thread.
  • the at least one power connection of the motor is configured to be electrically disconnected from the at least one fixed connection.
  • the motor is configured not to rotate the worm thread in response to a threshold torque being applied from the spring support to the worm thread when the energy stored in the main spring has reached the threshold level.
  • an increasing torque is developed in the spring support or cup and this in effect pushes against the worm thread.
  • An internal sensor within the motor can for example sense this increasing pushing force and when a threshold torque has developed, the motor can be switched off.
  • the motor is fixed and only the worm thread moves itself laterally with respect to the body of the motor, and this movement can be utilised to turn off the motor when for example a threshold movement distance has occurred.
  • the switch or sensor that detects the lateral movement of the worm thread can be outside of the housing of the motor, or it can also be integrated in the motor.
  • application of the threshold torque from the spring support to the worm thread is configured to move the motor the threshold distance.
  • the motor is configured to continuously rotate the worm thread when a power source is connected to the motor.
  • the motor is configured not to rotate the worm thread when the power source is dis-connected from the motor.
  • the worm thread is configured to engage with the thread of the spring support to stop the spring support from rotating when the energy stored in the main spring has reached the threshold level.
  • the motor is configured to rotate the worm thread upon energy release from the main spring that has reached the threshold energy level.
  • a circuit breaker comprises the low, medium or high voltage switch.
  • a low, medium or high voltage switchgear comprising a switching system according to the first aspect.
  • Figs. 1-2 relate to a switching system 1 that has a low, medium or high voltage switch, or at least part of such a switch, and a charging device, and to a switchgear that has such a switching system.
  • An example of a switching system 1 comprises a low, medium or high voltage switch and a charging device.
  • the switching system comprises a main spring 10 of the low, medium or high voltage switch, a spring support 20 of the low, medium or high voltage switch, a main shaft 30 of the low, medium or high voltage switch and a motor 40 of the charging device.
  • a first end 11 of the main spring is connected to the spring support.
  • a second end 12 of the main spring is connected to the main shaft.
  • the spring support is configured to rotate about an axis of the main shaft. At least part of a circumference of the spring support comprises a thread 22. The whole circumference can have the thread in certain examples.
  • the motor comprises a worm thread configured to engage with the thread of the spring support.
  • the motor is configured to rotate the worm thread, and rotation of the worm thread is configured to rotate the spring support to store energy in the main spring.
  • the motor is configured not to rotate the worm thread when the energy stored in the main spring has reached a threshold level. Energy release from the main spring is configured to rotate the main shaft.
  • the spring support comprises a cup.
  • At least part of an outer circumference of the spring support comprises the thread.
  • a mounting of the motor is configured to enable the motor to move.
  • the motor is configured not to rotate the worm thread when the motor has moved a threshold distance.
  • the mounting of the motor comprises a spring 60 configured to resist the movement of motor to the threshold distance.
  • movement of the motor to the threshold distance is configured to trigger a switch to stop the motor from rotating the worm thread.
  • the motor comprises at least one power connection 43, 44.
  • the at least one power connection of the motor is configured to be in electrical connection with at least one fixed connection 53, 54 to provide power to the motor to rotate the worm thread.
  • the at least one power connection of the motor is configured to be electrically disconnected from the at least one fixed connection 53, 54.
  • the motor is configured not to rotate the worm thread in response to a threshold torque being applied from the spring support to the worm thread when the energy stored in the main spring has reached the threshold level.
  • application of the threshold torque from the spring support to the worm thread is configured to move the motor the threshold distance.
  • the motor is configured to continuously rotate the worm thread when a power source is connected to the motor.
  • the motor is configured not to rotate the worm thread when the power source is dis-connected from the motor.
  • the worm thread is configured to engage with the thread of the spring support to stop the spring support from rotating when the energy stored in the main spring has reached the threshold level.
  • a circuit breaker can be or comprise the low, medium or high voltage switch as described above.
  • the motor is configured to rotate the worm thread upon energy release from the main spring that has reached the threshold energy level.
  • a simple and effective system is provided to charge the main spring of a drive for a circuit breaker for example, that continuously charges the mainspring until it reaches a threshold charge level, where charging stops, and upon discharge of the main spring the charging of the mainspring again begins.
  • a low, medium or high voltage switchgear can have a switching system as described above.
  • Fig. 1 shows the switching system 1 that CB main spring charging device with a discharged main spring 10 of a CB.
  • the main spring 10 is installed in a cup 20.
  • the main spring 10 has an outer end 11 that is connected to the pin 21 in the cup 20 and an inner end 12 that is connected to the groove 31 in the main shaft 30 of the CB. Unless the CB is operating, the main shaft 30 is not rotating, so that the main spring 10 can be charged when its outer end 11 is rotated counter clockwise.
  • a charging motor 40 is provided.
  • the charging motor 40 is movable from the left to right. Its worm thread 42 engages with the thread 22 of the cup 20, which provides a self-locking function based on the worm thread principle.
  • the auxiliary spring 60 pushes the motor 40 to the leftmost position shown in Fig. 1 .
  • the cup 20 is rotated counter clockwise to charge the main spring 10.
  • the torque that is building up in the main spring 10 pushes the motor 40 with a corresponding force to the right.
  • this force is lower than the force of the auxiliary spring 60, so that the charging motor 40 stays in the leftmost position shown in Fig 1 .
  • the leftmost position of the motor 40 can be defined with a mechanical stop (not shown). In this leftmost position, the motor 40 is connected to its electrical supply via the electrical contacts 43, 53 and 44, 54, where 43 and 44 are fixed to the motor 40 while 53 and 54 are fixed to the environment.
  • Fig. 2 the switching system is shown where charging of the main spring 10 is complete.
  • the torque that was built up in the main spring 10 is now strong enough to push the motor 40 to the right, against the force of the auxiliary spring 60, to the rightmost position of the motor 40.
  • This rightmost position can be defined with a mechanical stop (not shown).
  • the electrical contacts 43 and 44 are away from their fixed counterparts 53 and 54, so that the electrical feeding circuit of the motor 40 is interrupted and the charging process is terminated.
  • an off-the-shelf switch or microswitch can be used that is operated by the change of the position of the motor 40.
  • one of the two electrical contacts 43, 53 or 44, 54 may be replaced by a solid electrical connection, e.g. a cable. This would save one electrical contact while the switching function of the motor is still provided.
  • the pre-load of the auxiliary spring 60 may be adapted for example by changing the position of the fixed plate 70 towards or away from the auxiliary spring 60, or by inserting distance plates of a certain thickness between the auxiliary spring 60 and the fixed 70 or between the auxiliary 60 and the motor 40.
  • Fig. 3 shows an example of a planetary drive system for a circuit breaker, that utilizes a main spring 10 charged as described above with respects to Figs. 1-2 , and where rotation of the main shaft is utilized.
  • Fig. 3 shows three instants of the closing operation, from left to right: OFF position, intermediate position, ON position.
  • the energy for the operation is stored in the closing or main spring 10.
  • both the planetary cogwheel carrier 500 and the hollow cogwheel ring 600 are locked against rotation by their relevant locking features shown as 520, 620 and locking devices shown as 900, 1000.
  • the closing spring 10 is charged to drive the closing operation while the opening spring 800 is discharged.
  • the locking device 900 For closing, the locking device 900 is unlocked, so that the closing spring 10 can drive the carrier 500 counter-clockwise.
  • the outer end 21 of the closing spring 10 is currently locked in the shown position.
  • the sun cogwheel 300 is connected or coupled to the pushrod 100 by for example a high helix thread 200 (or another thread type) so that a counter-clockwise rotation of the sun cogwheel 300 shifts the pushrod 100 away from the OFF-position towards the ON-position.
  • This motion of the pushrod 100 charges the opening spring 800, as its upper end 820 is permanently locked in the shown position while the lower end of 800 is connected to the pushrod 100.
  • the sun cogwheel 300 can have a male thread and the pushrod 100 have a female thread, or the sun cogwheel 300 can have a female thread and the pushrod 100 have a male thread.
  • the closing spring 10 has rotated the carrier 500 by 45° counter-clockwise. According to the chosen number of teeth, this corresponds to a counter-clockwise rotation of 180° of the sun cogwheel 300. Due to the high helix thread 200, the pushrod was moved half of its way upwards from OFF to ON. The opening spring was charged by the movement of the pushrod. In the ON-position shown at the right side of Fig. 3 , the closing spring 10 has rotated the planetary carrier 500 by 90° counter-clockwise. According to the chosen number of teeth, this corresponds to a rotation of 360° counter-clockwise of the sun cogwheel 300.
  • the pushrod was moved its complete way upwards from OFF to ON.
  • the opening spring was fully charged.
  • the next locking feature 520 is in a position where the locking device 900 can push a pin, e.g. driven by a spring, into the locking feature 520 and so stop and latch the closing operation.
  • the closing operation can also be stopped and latched by separate devices.
  • locking features 520 are not only provided at the OFF and the ON positions of the cogwheel planetary carrier 500, but also in the intermediate position.
  • the pushrod 100 is again threaded but is not connected or coupled to the sun cogwheel 300.
  • the hollow cogwheel ring 600 has a top cover that can be for example a disk, and a centre of this disk is threaded.
  • the sun cogwheel 300 and planetary cogwheels 400 in this example are underneath the top cover of the cogwheel ring 600.
  • the closing spring 10 can again drive the carrier 500 and the planetary cogwheels 400 around the axis of the sun cogwheel 300.
  • the sun cogwheel 300 can then be locked in position and not rotate and the hollow cogwheel ring 600 then rotates in a clockwise direction.
  • the pushrod 100 can then be threaded in the opposite direction to that described above, and again the pushrod moves away from the off position towards the on position.
  • the closing spring 10 can be in effect rotated 180° and the energy release can rotate the carrier in the opposite direction to that described above and again rotation of the cogwheel ring 600 now again in the counter clockwise direction leads to movement of the pushrod from the opposition to the on position.
  • the cogwheel ring 600 can have a male thread and the pushrod 100 have a female thread, or the cogwheel ring 600 can have a female thread and the pushrod 100 have a male thread.
  • the pushrod 100 is again threaded and connected or coupled to the sun cogwheel 300.
  • the closing spring 10 is coupled to the cogwheel ring 600 and now drives rotation of the cogwheel ring 600 rather than driving rotation of the carrier 500 of the planetary cogwheels 400.
  • the carrier 500 of the planetary cogwheels 400 is then held in a fixed position, and does not rotate, but the individual planetary cogwheels 400 then rotate about their axes with rotation of the cogwheel ring 600 then rotating the sun cogwheel 300, which then drives the pushrod 100.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP20194853.6A 2020-09-07 2020-09-07 Schaltsystem Pending EP3965130A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20194853.6A EP3965130A1 (de) 2020-09-07 2020-09-07 Schaltsystem
CN202111040220.3A CN114156143A (zh) 2020-09-07 2021-09-06 开关***

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20194853.6A EP3965130A1 (de) 2020-09-07 2020-09-07 Schaltsystem

Publications (1)

Publication Number Publication Date
EP3965130A1 true EP3965130A1 (de) 2022-03-09

Family

ID=72428155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20194853.6A Pending EP3965130A1 (de) 2020-09-07 2020-09-07 Schaltsystem

Country Status (2)

Country Link
EP (1) EP3965130A1 (de)
CN (1) CN114156143A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE499839C (de) * 1928-09-26 1930-06-17 Asea Ab Antriebsvorrichtung fuer Stromschalter
CH220843A (de) * 1941-06-07 1942-04-30 Oerlikon Maschf Antriebsvorrichtung mit Spiralfeder-Kraftspeicher für elektrische Schalter.
JPS5794123U (de) * 1980-12-01 1982-06-10
CH682431A5 (de) * 1991-09-10 1993-09-15 Sprecher Energie Ag Federkraftspeicherantrieb.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2249360B1 (de) * 2009-05-04 2012-07-04 ABB Technology AG Antriebsmechanismus für Mittelspannungsschalter
DE102011008833B4 (de) * 2011-01-19 2013-03-07 Abb Ag Überstromauslöser und Installationsschaltgerät mit Überstromauslöser
JP5810922B2 (ja) * 2012-01-06 2015-11-11 住友電装株式会社 電源回路遮断装置
CN202816814U (zh) * 2012-08-31 2013-03-20 朱国忠 脱扣开关装置
CN105221594A (zh) * 2015-09-28 2016-01-06 平高集团有限公司 一种操动机构及其摩擦离合装置
CN107833807B (zh) * 2017-11-21 2021-06-22 浙江正泰电器股份有限公司 电磁脱扣装置
CN111048364A (zh) * 2020-01-14 2020-04-21 永康串行电子有限公司 一种可防止间歇电流不稳定断电的电开关
CN111438134A (zh) * 2020-04-28 2020-07-24 江西省赣抚平原水利工程管理局(江西省灌溉试验中心站) 一种蒸渗测坑地下水柱筒自动清洗装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE499839C (de) * 1928-09-26 1930-06-17 Asea Ab Antriebsvorrichtung fuer Stromschalter
CH220843A (de) * 1941-06-07 1942-04-30 Oerlikon Maschf Antriebsvorrichtung mit Spiralfeder-Kraftspeicher für elektrische Schalter.
JPS5794123U (de) * 1980-12-01 1982-06-10
CH682431A5 (de) * 1991-09-10 1993-09-15 Sprecher Energie Ag Federkraftspeicherantrieb.

Also Published As

Publication number Publication date
CN114156143A (zh) 2022-03-08

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