Classifications

• • 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
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/62—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
  • H01H71/64—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement incorporating toggle linkage
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/20—Interlocking, locking, or latching mechanisms
  • H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/20—Interlocking, locking, or latching mechanisms
  • H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
  • H01H2009/267—Interlocking, locking, or latching mechanisms for interlocking two or more switches with interlocking of two out of three switches, e.g. two switches each connecting a power supply to a busbar and a bus coupling switch interlocked in such a way that the power supplies are never connected in parallel
• • 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
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/62—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement

Definitions

• the present disclosure generally relates to a locking mechanism for high voltage systems, more particularly the present disclosure relates to the locking mechanism for an energy storage module in a circuit breaker.
• the circuit breaker also includes an energy module, the energy module constitutes of an operating mechanism, individually controlled double close coils, close-on-close interlocking, spring charging indicators, and mechanical closing provisions.
• a locking mechanism for an energy storage module in a circuit breaker is provided.
• the locking mechanism is arranged to interact with a triggering lever in the circuit breaker.
• the locking mechanism includes a first link arranged to rotate upon engagement of a key with the first link.
• the locking mechanism also includes a second link coupled to the first link, wherein the rotation of the first link transfers a motion to the second link and rotates the second link.
• the locking mechanism includes a third link comprising a first end and a second end, wherein a first pivoting axis of the first end is displaced in a first direction and a second pivoting axis of the second end is displaced in a second direction.
• the first end of the third link is coupled to the second link and the second end of the third link is coupled to a first end of a fourth link.
• the locking mechanism includes a first joint arranged to convert the rotation of the second link into a linear motion of the third link.
• the locking mechanism also includes a second joint arranged to convert linear motion of the third link into rotation of the fourth link.
• the locking mechanism includes a third joint coupled to a second end of the fourth link, wherein upon rotation of the fourth link, the third joint is arranged to restrict a motion of the triggering lever.
• the above locking mechanism provides a compact design and achieves efficient motion transmission with minimal stroke loss. Further, the locking mechanism provides flexible rotation between the first link and the fourth link, thereby expanding its applicability beyond switchgear applications.
• first link and the second link are arranged to rotate around a first axis.
• fourth link is arranged to rotate around a second axis perpendicular to the first axis.
• a plane of rotation between the first link and the fourth link changes at a first angle selected in a range of 0° to 90°. Further, the first pivoting axis of the first end of third link and the second pivoting axis of the second end of third link are displaced at a second angle in selected in a range of 0° to 120°. The change in the plane of rotation provides versatile applicability of mechanism in various energy isolation requirements and other applications.
• the third link is a twisted link. Further, the third joint includes an eccentric pin.
• the triggering lever upon rotation of the fourth link, falls tangent to the third joint, thereby restricts the motion of the triggering lever.
• the first link is a fixed link and each of the second link, the third link, and fourth link are movable links.
• the locking mechanism is arranged to accommodate at least one of: a double coil module, and a close on close interlock module.
• the fourth link comprises a fourth joint, wherein the fourth joint is arranged to form a revolute joint with the fourth link.
• the first joint is arranged to form a slotted joint between the second link and the third link. Further, the second joint is arranged to form a slotted joint between the third link and the fourth link.
• first joint, the second joint, the third joint, and the fourth joint may be at least one of: pin and shaft.
• the four-bar mechanism described above may be a non-planar four-bar mechanism.
• a circuit breaker includes a triggering lever and an energy storage module comprising a locking mechanism according to the first aspect of the present disclosure configured to interact with the triggering lever.
• the circuit breaker includes a casing housing the energy storage module and the triggering lever, wherein the first link of the locking mechanism extends through a wall of the casing, is rotational around a first axis and is fixed relative to said wall in the direction of said first axis.
• the circuit breaker includes a key connected to the first link, said key is located on an outside of the casing and accessible from outside the casing for enabling rotation of the first link of the locking mechanism from outside the casing.
• the triggering lever is arranged to rotate around an axis which is perpendicular to the first axis.
• the state of the first link changes from unlocked condition to locked condition.
• the motion is transferred to the fourth link via a four-bar mechanism as described above.
• the third joint achieves the position wherein an outer surface of the triggering lever falls tangent to the third joint. Thereby rotation of the triggering lever is prevented and since lever rotation triggers the closing operation of the circuit breaker, until the first link is in locked state, closing operation of circuit breaker is prevented.
• the locking mechanism mentioned above is not only compact in nature but also transfers required motion with minimum loss of stroke via the four-bar mechanism. Further, the present mechanism provides flexible rotation between the first and fourth links, spanning a range of 0° to 90°, thereby expanding its applicability beyond switchgear applications.
• FIG. 1 to Fig. 4 different views of a locking mechanism 100 are shown in Fig. 1 to Fig. 4 in locked or unlocked condition.
• FIG. 1 discloses a side view of a locking mechanism 100 in an unlocked condition.
• the locking mechanism 100 is provided for an energy storage module 202 in a circuit breaker 200, in which the locking mechanism 100 is arranged to interact with a triggering lever 102 in the circuit breaker 200.
• the locking mechanism 100 includes a first link 104 arranged to rotate upon engagement of a key 106 with the first link 104. Further, the locking mechanism 100 includes a second link 108 coupled to the first link 104. The rotation of the first link 104 transfers a motion to the second link 108 and rotates the second link 108.
• the locking mechanism 100 includes a third link 110 comprising a first end and a second end, wherein a first pivoting axis of the first end is displaced in a first direction and a second pivoting axis of the second end is displaced in a second direction.
• the first end of the third link 110 is coupled to the second link 108 and the second end of the third link 110 is coupled to a first end of a fourth link 112.
• the locking mechanism 100 includes a first j oint 114 arranged to convert the rotation of the second link 108 into a linear motion of the third link 110.
• the locking mechanism 100 also includes a second joint 116 arranged to convert linear motion of the third link 110 into rotation of the fourth link 112.
• the locking mechanism 100 further includes a third joint 118 coupled to a second end of the fourth link 112, and wherein upon rotation of the fourth link 112, the third joint 118 is arranged to restrict a motion of the triggering lever 102.
• the above locking mechanism 100 provides a compact design and achieves efficient motion transmission with minimal stroke loss. Further, the locking mechanism 100 provides flexible rotation between the first link 104 and the fourth link 112, thereby expanding its applicability beyond switchgear applications.
• first link 104 and the second link 108 are arranged to rotate around a first axis
• fourth link 112 is arranged to rotate around a second axis perpendicular to the first axis.
• a plane of rotation between the first link 104 and the fourth link 112 changes at a first angle selected in a range of 0° to 90°. Further, the first pivoting axis of the first end of the third link 110 and the second pivoting axis of the second end of the third link 110 are displaced at a second angle in selected in a range of 0° to 120°.
• the change in the plane of rotation provides versatile applicability of mechanism in various energy isolation requirements and other applications.
• the third link 110 is a twisted link.
• the third joint 118 comprises an eccentric pin.
• the triggering lever 102 falls tangent to the third joint 118 and thereby restricts the motion of the triggering lever 102.
• the first link 104 is a fixed link and each of the second link 108, the third link 110, and fourth link 112 are movable links. Further, the locking mechanism 100 is arranged to accommodate at least one of: a double coil module 120 and a close on close interlock module 122.
• the fourth link 112 comprises a fourth joint 124, wherein the fourth joint 124 is arranged to form a revolute joint with the fourth link 112.
• the fourth joint 124 forms slotted joint with the fourth link 112 and thereby it converts the linear motion of third link 110 into rotary motion of the fourth link 112.
• the fourth link 112 is pivoted to ground (not shown) by the fourth joint 124.
• first j oint 114 is arranged to form a slotted j oint between the second link 108 and the third link 110, and wherein the second joint 116 is arranged to form a slotted joint between the third link 110 and the fourth link 112.
• first joint 114, the second joint 116, the third joint 118, and the fourth joint 124 may be at least one of: pin and shaft.
• Fig. 2 depicts an isometric view of the locking mechanism 100 described above in an unlocked condition in reference to Fig 1 . Details of the locking mechanism 100 as shown in Fig. 2 are similar to the details as discussed in Fig. 1 and hence are not repeated for the sake of brevity.
• Fig. 3 discloses a side view of the locking mechanism 100 in a locked condition.
• Fig. 4 depicts an isometric view of the locking mechanism 100 described above in a locked condition.
• the locking mechanism 100 In operation of the locking mechanism 100 to change a state of the mechanism 100 from unlocked to locked condition, when the key 106 is rotated in clockwise direction it will rotate a shaft (not shown) of the first link 104 until it completes full stroke.
• the second link 108 fixated on the shaft of first link 104 also rotates by specified stroke.
• the second link 108 including a slot that allows the first joint 114 to slide freely and prevent the jamming of the mechanism 100.
• the second link 108 also prevents the axial movement of the third link 110 in a direction perpendicular to a rotation plane of the first link 104.
• the axial movement of the third link 110 in a direction perpendicular to the plane of rotation of the fourth link 112 is restricted by the fourth link 112.
• the circuit breaker 200 includes a triggering lever 102 and an energy storage module 202 comprising the locking mechanism 100 according to Figs. 1-4 .
• the locking mechanism 100 is configured to interact with the triggering lever 102.
• the circuit breaker 200 includes a casing 204, housing the energy storage module 202 and the triggering lever 102. Further, the first link 104 of the locking mechanism 100 extends through a wall of the casing 204 and is rotational around a first axis and is fixed relative to said wall in the direction of said first axis.
• the circuit breaker 200 includes the key 106 connected to the first link 104, said key 106 being located on an outside of the casing 204 and accessible from outside the casing 204 for enabling rotation of the first link 104 of the locking mechanism 100 from outside the casing 204. Further, the triggering lever 102 is arranged to rotate around an axis which is perpendicular to the first axis.
• the state of the first link 104 changes from unlocked condition to locked condition.
• the motion is transferred to the fourth link 112 via a four-bar mechanism as described above.
• the third joint 118 achieves the position wherein an outer surface of the triggering lever 102 falls tangent to the third joint 118.
• rotation of the triggering lever 102 is prevented and since lever rotation triggers the closing operation of the circuit breaker 200, until the first link 104 is in locked state, closing operation of circuit breaker 200 is prevented.
• the four-bar mechanism described above comprises a non-planar four-bar mechanism.
• the above mentioned locking mechanism 100 not only embodies a compact design but also achieves efficient motion transmission with minimal stroke loss, leveraging the advantages of the four-bar mechanism (i.e., the first link 104, the second link 108, the third link 110, and the fourth link 112). Further, the locking mechanism 100 provides flexible rotation between the first link 104 and fourth link 112, spanning a range of 0° to 90°, thereby expanding its applicability beyond switchgear applications.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

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Citations (2)

• 2024
  • 2024-01-23 EP EP24153449.4A patent/EP4593054A1/fr active Pending

Patent Citations (2)

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