EP3901977A1 - Mécanisme de commande d'un commutateur de mise à la terre d'un appareillage de commutation moyenne tension - Google Patents

Mécanisme de commande d'un commutateur de mise à la terre d'un appareillage de commutation moyenne tension Download PDF

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Publication number
EP3901977A1
EP3901977A1 EP20170814.6A EP20170814A EP3901977A1 EP 3901977 A1 EP3901977 A1 EP 3901977A1 EP 20170814 A EP20170814 A EP 20170814A EP 3901977 A1 EP3901977 A1 EP 3901977A1
Authority
EP
European Patent Office
Prior art keywords
disk
assembly
sub
rotating element
rotating
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
EP20170814.6A
Other languages
German (de)
English (en)
Inventor
Simone Rambaldini
Andrea Arvati
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 EP20170814.6A priority Critical patent/EP3901977A1/fr
Priority to CN202110210893.2A priority patent/CN113539729A/zh
Publication of EP3901977A1 publication Critical patent/EP3901977A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/003—Earthing switches
    • 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
    • H01H3/3015—Charging means using cam devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/006—Air-break switches for high tension without arc-extinguishing or arc-preventing means adapted to be operated by a hot stick; Hot sticks therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/02—Details
    • H01H31/04—Interlocking mechanisms
    • 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
    • H01H2003/3057—Power arrangements internal to the switch for operating the driving mechanism using spring motor provisions for avoiding idling, e.g. preventing release of stored energy when a breaker is closed, or when the springs are not fully charged
    • 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
    • H01H3/3047—Power arrangements internal to the switch for operating the driving mechanism using spring motor adapted for operation of a three-position switch, e.g. on-off-earth
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H33/6661—Combination with other type of switch, e.g. for load break switches
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/128—Manual release or trip mechanisms, e.g. for test purposes
    • 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
    • H01H71/504—Manual reset mechanisms which may be also used for manual release provided with anti-rebound means
    • 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
    • H01H71/505—Latching devices between operating and release mechanism

Definitions

  • the present invention relates to an electric switchgear for medium-voltage applications. More particularly, the present invention relates to an operating mechanism for controlling an earthing switch addressed to be installed in a medium voltage switchgear.
  • Electric switchgears are well known in electric power transmission and distribution grids. They usually comprise a metallic cabinet internally divided into several compartments or cells accommodating various apparatuses and equipment. In many applications, electric switchgears include a switching apparatus (e.g. a circuit breaker) of the withdrawable type, i.e. reversibly movable between a first position (inserted position), in which the switching apparatus is electrically connected with the disconnection contacts of the switchgear, and a second position (withdrawn position), in which the switching apparatus is electrically disconnected from said disconnection contacts.
  • a switching apparatus e.g. a circuit breaker
  • withdrawable type i.e. reversibly movable between a first position (inserted position), in which the switching apparatus is electrically connected with the disconnection contacts of the switchgear, and a second position (withdrawn position), in which the switching apparatus is electrically disconnected from said disconnection contacts.
  • Electric switchgears of the above-mentioned type generally include also an earthing switch assembly.
  • the latter typically comprises an earthing switch, an operating mechanism for controlling the earthing switch and mechanical connection means, typically connection levers, which operatively connect the earthing switch to the operating mechanism.
  • the earthing switch comprises a mechanism for moving a plurality of moving contacts between a first reference position, characteristic of an opening condition of the earthing switch and a second reference position characteristic of a closing condition of the earthing switch. In the second reference position, the movable contacts engage fixed contacts each of one electrically connected to an electric line.
  • the mechanism of the earthing switch comprises a shaft on which the movable contacts are rigidly mounted.
  • the shaft rotates about a longitudinal axis so that also the movable contacts can rotate correspondingly between said reference positions.
  • the rotation is controlled by an operating mechanism above cited.
  • the operating mechanism typically comprises a rotating disk or a shaft operatively connected to the main shaft of the earthing switch mechanism so that a rotation of the disk results in a rotation of the earthing switch shaft supporting the movable contacts.
  • the disk can be rotated by means of an operating lever to change the condition of the earthing switch.
  • the operating mechanism is located far enough away from the earthing switch (1000-2000 mm) and it is operatively connected to the shaft of the earthing switch mechanism by connection means (a lever system).
  • the operating lever allows the rotation of the disk between a first angular position, characteristic of an opening condition of the earthing switch, and a second angular position characteristic of a closing condition of the earthing switch.
  • the earthing switch comprises spring means operatively connected to the shaft that supports the moving contacts.
  • the spring means are loaded during a first phase of the closing movement, i.e. during a first phase of rotation of the shaft and of the movable contacts mounted thereof.
  • the spring means discharge their elastic energy on the shaft so as to bring the movable contacts instantly and correctly in the second reference position, i.e. in electrical connection with the fixed contacts.
  • the spring means are loaded during the opening movement of the earthing switch.
  • the closing operation of the earthing switch comprises a first phase performed by an operator acting on the operating lever above indicated and a second phase, not controllable by the operator, determined by the release of the energy of the spring means. Therefore, the closing operation is only partially dependent from the operator.
  • the opening of the earthing switch is an operation totally dependent on the will and the force of the operator. That means, during the opening movement, substantially in any angular position, the operator is allowed to stop the opening movement and to start a re-closing movement, i.e. to bring back the disk in the position corresponding to the closing condition of the earthing switch.
  • the main aim of the present invention is providing an operating mechanism for controlling a medium voltage earthing switch, which makes it possible to overcome or mitigate the aforementioned problems of the known art.
  • an object of the present invention is providing an operating mechanism which allows to achieve the closing condition of the earthing switch in a safe way and to keep such a condition avoiding dangerous manoeuvres.
  • Another object of the present invention is providing an operating mechanism in which the closing condition of the earthing switch cannot be reached only by a manual intervention of an operator.
  • a further object is providing an operating mechanism in which the closing movement of the earthing switch always involves the action of the spring means associated to the earthing switch.
  • Yet another object of the present invention is providing an operating mechanism easy to manufacture at industrial level, at competitive costs with similar installations of the state of the art.
  • the operating mechanism comprises an operating disk rotating about a main axis between a first angular position and a second angular position that correspond, respectively, to an opening condition and to a closing condition of the earthing switch.
  • the mechanism also comprises a connecting assembly which connects operatively said operating disk to the earthing switch and an operating lever for rotating the disk from the first angular position to the second angular position according to a closing movement and vice-versa according to an opening movement; the connecting assembly is configured so as to transform the closing and the opening movement of the disk, respectively, in a closing and an opening movement of the earthing switch.
  • the operating mechanism comprises an interlock assembly that prevents a re-closing movement of the disk when, starting from said second angular position and according to said opening movement, the disk reaches a pre-established angle.
  • the interlock assembly avoids the return of the earthing switch in the closing condition unless the opening movement is completed. This means that the closing movement of the earthing switch can always exploit the elastic energy of spring assembly associated with the opening/closing mechanism installed on the earthing switch. Therefore, at the end of the closing movement, the moving contacts reach always the correct position which ensure a safe electrical connection with the fixed contacts.
  • the interlock assembly comprises a first sub-assembly integral with said disk and a second sub-assembly which interacts with the first sub-assembly, wherein the second sub-assembly is mounted on a fixed frame.
  • the first sub-assembly comprises a first element integral with the disk, while the second sub-assembly comprises a first element hinged to said frame.
  • the first rotating element rotates under the action of a at least one first spring element.
  • the first rotating element cooperates with the first element of the first sub-assembly to prevent said re-closing movement.
  • the first sub-assembly comprises a second element integral with the disk, wherein, during the rotation of said disk according to said opening movement, the second element moves the first rotating element from said locking position to an unlocking position loading said at least one first spring element;
  • the second sub-assembly comprises a second rotating element hinged to the frame and subjected to the action of at least one second spring element. Such a second rotating element locks said first rotating element when the latter reaches the unlocking position.
  • the first rotating element reaches the unlocking position when the disk reaches said second angular position.
  • the first rotating element of the second sub-assembly rests against the first element of the first sub-assembly.
  • the first sub-assembly comprises a third element, integral with said disk, which, during said closing movement, acts on the second rotating element so as to move it from the locking position and to make the first element of the second sub-assembly free to rotate under the action of said at least one spring element.
  • the third element is fixed to the disk in a position angularly interposed between the position of said first element and of said second element.
  • the first element and the second element of the second sub-assembly rotate, respectively, about a first rotation axis and a second rotation axis parallel to said main axis.
  • the frame comprises a pair of side walls opposite each other and that develop on planes substantially orthogonal to the main axis; the frame also comprises a longitudinal wall which develops parallelly to the main axis between the side walls in a position distal from the disk so that the second sub-assembly is substantially arranged between said disk and the longitudinal wall.
  • the first element and/or the third element of the first sub-assembly are rigidly connected to a cylindrical peripheral surface of the disk.
  • the second element of the first sub-assembly is plate shaped and connected to a main surface of the disk.
  • the first rotating element of the second sub-assembly comprises a first portion and a second portion that is fork shaped; said at least one first spring element is connected between the frame and the first portion; the second portion interacts with the first element of the first sub-assembly to prevent said re-closing movement.
  • the second portion defines a central slot for the passage of the third element of the first sub-assembly during the opening movement of the disk and when the first rotating element is at said locking position.
  • the second rotating element of the second sub-assembly comprises a front portion faced to the disk and a rear portion opposed to the front portion; the second spring element is connected to the rear portion and to a wall of the frame.
  • the front portion is provided with a locking pawl that protrudes towards the first rotating element; the first portion of the first rotating element comprises a bottom seat in which the locking pawl inserts when the first rotating element reaches the unlocking position due to the action of the second element of the first sub-assembly.
  • the present invention relates to an operating mechanism 1 for controlling an earthing switch usable for medium voltage applications.
  • the term "medium voltage” relates to operating voltages higher than 1 kV up to some tens of kV, e.g. 70 kV AC and 100 kV DC.
  • the operating mechanism 1 is usable in a MV switchgear and operatively connectable to an earthing switch (not shown in the figures) arranged in a position relatively away from the mechanism 1 (typically 1-2 meters).
  • the operating mechanism 1 is usable independently on the configuration of the mechanism of the earthing switch provided to rotate the moving contacts.
  • the operating mechanism 1 is arranged in a casing 80 that is connectable to the switchgear or that can be a part of it.
  • the casing 80 comprises a base 81 and two opposite flanks 81A, 81B which develop orthogonally from the base 81.
  • the most of the components of the mechanism 1 is arranged between the flanks 81A, 81B.
  • the casing 80 also comprises a rear wall 82 and a front panel 83 opposed to the rear wall 82.
  • the base 81 and the real wall 82 could be defined by a sole metal sheet L shaped.
  • the mechanism 1 comprises an operating disk 10 rotating about a main axis 100.
  • the disk 10 is mounted on a shaft 110 which is supported, inside the casing 80, by the flanks 81A, 81B at opposite ends. As indicated in figure 8 , the disk 10 comprises two main surfaces 10A mutually opposed that develop on parallel planes orthogonal to the main axis. The disk 10 also comprises a cylindrical peripheral surface 10B that develops between the two main surfaces 10A of the disk 10.
  • the disk 10 is configured so as to assume a first angular position and a second angular position, which are characteristic, respectively, of an opening condition and of a closing condition of said earthing switch.
  • the angular positions are considered with respect to the main axis 100. Therefore, a movement from said first angular position to said second angular position, or vice versa, corresponds to a rotation of the disk 10 of a pre-established angle ⁇ .
  • the disk 10 is shown in the second reference position (closing condition).
  • the references axes X-X and Y-Y are indicated on a plane orthogonal to the main axis 100.
  • Figure 12 shows the disk 10 in the first angular position (opening condition).
  • said pre-established angle ⁇ is about 90° as clear evident from the comparison of Figures 6 and 12 .
  • the operating mechanism 1 comprises a connecting assembly 11 (see figures 1 and 3 ) configured to connect the operating disk 10 with the earthing switch (not shown) so that a rotation of the disk 10 determines a change of the earthing switch condition. More in detail, according to a solution per-se known, the connecting assembly 11 turns the rotation of the disk 10 in a corresponding rotation of the shaft of the earthing switch mechanism to which the moving contacts are rigidly connected.
  • the connecting assembly 11 comprises two connecting levers 11A, 11B (see figure 1 ) hinge at a lever 111 mounted at one end 110A of the shaft 110 supporting the disk 10. More in detail, the connecting levers 11A, 11B are hinged at points of said lever 111 diametrically opposed with respect to the main axis 100.
  • the operating mechanism 1 also comprises an operating lever 12 for rotating the disk 10 between said angular positions (first and second) above defined. More precisely, the operating lever 12 allows to rotate the disk 10 from said first angular position (see Figure 12 ) to said second angular position according to a closing movement W1 and from said second angular position (see figure 9 ) to said first angular position according to an opening movement W2.
  • the connecting assembly 11 is configured so that the closing movement W1 and the opening movement W2 of the disk 10 result, respectively, in a closing movement and in an opening movement of the earthing switch.
  • the lever 12 is the means that allows the operator to change, via the disk 10, the configuration of the earthing switch.
  • the front panel 83 comprises a slot 83A from which a handling part 12A of the operating lever 12 protrudes (see figure 4 ).
  • a fixing part 12B of the lever 12 is connected to the disk 10 inside the casing 80. An operator can grasp the handling part to rotate the disk 10. Referring to a normal installation position, when the operating disk 10 is at the first angular position, the lever 12 is oriented downwards (see figure 12 ). On the contrary, the operating disk 10 is at the second angular position, the lever 12 is oriented upwards (see figure 4 ).
  • the lever 12 is connectable to the disk 10 in a removable way by coupling means configured so that the lever 12 can be separated from, or connected, to the disk 10 only if the latter is at one of said angular positions (first or second). Therefore, the lever 12 can be removed from the disk 10 only when a corresponding manouvre (opening or closing) has been completed, without that any part of it protrudes anymore from the front panel 83 as shown in figures 1 and 3 .
  • the operating mechanism 1 comprises an interlock assembly 15 that prevents a re-closing movement of the disk 10 when, during the opening movement W2, it reaches, starting from said second angular position, a pre-established angle ⁇ .
  • the interlock assembly 15 prevents the return of the disk 10 in the second angular position (i.e. said re-closing movement) unless the opening movement is completed.
  • a pre-established angular position corresponding to said angle ⁇
  • the interlock assembly 15 avoids the rotation of the disk 10 in a direction corresponding to said closing movement W1.
  • the interlock assembly 15 comprises a first sub-assembly 15A integral with the disk 10 and a second sub-assembly 15B separated from said disk 10 and that interacts with the first-assembly 15A.
  • the components (31, 32, 33) of the first sub-assembly 15A are grouped by a dashed line.
  • the first sub-assembly 15A comprises a plurality of element 31, 32, 33 that are rigidly mounted on said disk 10 so that they can rotate with the disk 10 about the main axis 100.
  • the second sub-assembly 15B comprises a plurality of elements 41, 42, 51A, 51B, 52 mounted on a fixed frame 5 separated from the disk 10.
  • the frame 5 comprises a pair of the side walls 512A, 512B opposite each other and that develop on planes substantially orthogonal to the main axis 100 of the disk 10.
  • the side walls 512A, 512B are preferably mounted on the base 81 of the casing 80.
  • the frame 5 also comprises a longitudinal wall 513 that develops parallelly to the main axis 100 and that connects the two side walls 512A, 512B. As clearly shown in figure 8 , the frame 5 is arranged so that the longitudinal wall 513 is placed in a position relatively distal from the disk 10 so that the most of the elements of the second sub-assembly 15B is arranged between the longitudinal wall 513 and the disk 10 according to a reference direction T orthogonal to the main axis 100.
  • the first sub-assembly 15A comprises a first element 31 fixed to the disk 10, preferably on its peripheral cylindrical surface 10B.
  • the second sub-assembly 15B comprises a first rotating element 41 hinged to said frame 5 so as to rotate about a first axis 101 under the action of at least one spring element 51A, 51B (see figure 7 ).
  • the second sub-assembly 15B comprises a pair of spring elements 51A, 51B each of one connected between the first rotating element 41 and a corresponding of said side walls 512A, 512B.
  • the first rotating element 41 of the second sub-assembly 15B cooperates with the first element 31 of the first sub-assembly 15A to prevent said re-closing movement when, starting from said second angular position (closing condition), the disk 10 reaches said pre-established angle ⁇ .
  • the first rotating element 41 is dragged by the spring elements 51A, 51B in said locking position (see figure 10 ).
  • the re-closing movement (rotation according to W1) is forbidden because the rotation of the first element 31 integral with the disk 10 is impeded by the first rotating element 41.
  • the first rotation axis 101 of the first element 41 of the second sub-assembly 15B is substantially parallel to the main axis 100 about which the disk 10 rotates.
  • Said spring elements 51A, 51B exert a force on the first element 41 that tends to rotate and to keep it in said locking position.
  • the first element 41 of the second sub-assembly 15B rests against the first element 31 of the first sub-assembly 15A (see for example figures 5, 6 and 16 ).
  • the rotation of the disk 10 according to the opening movement W2 causes a counter-rotation, in contrast to the spring elements 51A, 51B, of the first rotating element 41 in an opposite direction (arrow T2 in Figure 9 ).
  • a counter- rotation takes place when the disk 10 reaches said pre-established angle ⁇ .
  • the first sub-assembly 15A comprises a second element 32 integral with said disk 10 and angularly distanced from said first element 31.
  • the second element 32 acts (in contrast to said at least one first spring element 51A, 51B) on the first element 41 of the second sub-assembly 15B so as to rotate it from said locking position to an unlocking position (see figure12 ).
  • the latter is a position for which a subsequent closing movement (direction W1) is allowed.
  • the first rotating element 41 reaches said unlocking position when the disk 10 reaches the first angular position, i.e. when the opening movement is completed (see figure 12 ).
  • the second element 32 of the first sub-assembly 15A is a plate connected to one of the main surfaces 10A of the disk 10.
  • a plate has a portion 32A protruding radially with respect to the peripheral edge 10B and that interacts with the first rotating element 41.
  • the second sub-assembly 15B comprises a second rotating element 42 hinged to the frame 5 and subjected to the action of a second spring element 52.
  • the second rotating element 42 locks the first rotating element 41 as soon as the latter reaches the unlocking position above indicated. Therefore, the second rotating element 42 avoids the counter-rotation of the first rotating element 41 towards the locking position during a first phase of the closing movement, that means when the second element 32 of the first sub-assembly 15A moves away from the first rotating element 41.
  • the second rotating element 42 rotates about a second rotation axis 102 that is substantially parallel to the first axis 101 and to the main axis 100 above indicated.
  • the second spring element 52 exerts a force on the second element 42 that tends to rotate and to keep it in a first operative position at which it locks the first rotating element 41. Therefore, when the second rotating element 42 locks the first rotating element 41, the second spring element 52 is partially discharged.
  • the second spring element 52 preserves a part of elastic energy to assure the correct engagement of the second rotating element 42 with the first rotating element 41, as below better described.
  • the second spring element 52 is arranged so as to rotate the second rotating element 42 according to a direction opposed to that around which the first rotating element 41 tends to rotate under the action of the at least one spring element 51 A, 52B.
  • the second rotating element 42 contacts the first rotating element 41 so that the locking position of the first rotating element 41 also depends on the action of the second spring element 52.
  • the frame 5 is provided with a fixed element 59 against which the first rotating element 41 abuts due to the combined action of the first spring element 51A, 51B and of the second spring element 52.
  • the spring elements 51A, 51B, 52 and the fixed element 59 establish the locking position of the first rotating element 41 of the second sub-assembly 15B (see Figure 10 ).
  • the first sub-assembly 15A comprises a third element 33, integral with the disk 10 and preferably connected to it at the cylindrical peripheral surface 10B.
  • the third element 33 acts on the second rotating element 42 of the second sub-assembly 15B so as to move it from its operative position and to make the first rotating element 41 free to rotate around the first axis 101 due to the action of the spring elements 51A, 51B.
  • the third element 33 is fixed to the disk 10 in a position angularly interposed between the positions of said first element 31 and of said second element 32. Therefore, during the closing movement and following the unlocking of the first rotating element 41 due to the third element 33, the first element 31 reaches its reference position before that the first rotating element 41 reaches its locking position (see figures 15 and 16 ).
  • the first rotating element 41 comprises a first portion 41A and a second portion 41B fork shaped (see figure 7 ).
  • the two portions 41A, 41B are substantially opposed with respect to the first axis 101. That means, with respect to a horizontal installation of the frame 5 (see figure 7 ) the first portion 41A and the second portion 41B develop, respectively, above and below the first axis 101.
  • a first spring element 51A is connected between a first end 410A of the first portion 41A and a first side wall 512A of the frame 5, while a second spring element 51B is connected between a second end 410B of the first portion 41A and a second side wall 512B (see again Figure 7 ).
  • the second portion 41B fork shaped interacts with the first element 31 of the first sub-assembly 15A in order to prevent the re-closing movement as above indicated.
  • the second rotating element 42 locks the first rotating element 41 acting on the first portion 41A.
  • the second portion 41B defines a central slot 44 for the passage of the third element 33 during the opening movement of the disk. More precisely, the slot 44 allows the passage of third element 33 when the first rotating element 41 is at its locking position (see figure 10 ). Therefore, the shape and dimensions of the slot 44 are defined as a function of those of the third element 33 connected to the peripheral edge 10B of the disk 10.
  • the second rotating element 42 is mounted on a shaft 43 supported by the side walls 512A, 512B of the frame 5 so as to define said second axis 102.
  • the second rotating element 42 comprises a front portion 42A and a rear portion 42B. Such portions 42A, 42B are substantially opposed with respect to the second axis 102.
  • the front portion 42A is contacted by the third element 33 of the first sub-assembly 15A, while the rear portion 42B is subjected to the action of the second spring element 52.
  • the longitudinal wall 513 of the frame 5 comprises a slot 513A (see figure 7 ) from which an end 420B of the rear portion 42B protrudes (see figure 5 ).
  • a fixing element 49 is installed on the outer wall 513B of the longitudinal wall 513 near its bottom part 513C.
  • the second spring element 52 is connected between the end 420B of the rear portion 42B and said fixing element 49.
  • the front portion 42A of the second rotating element 42 is provided with a locking pawl 47 protruding upward, i.e. towards the first rotating element 41.
  • the first portion 41A of the first rotating element 41 comprises a bottom seat 48 in which the locking pawl 47 inserts when the first rotating element 41 reaches the unlocking position due to the action of the second element 32 of the first sub-assembly 15A.
  • the engaging of the locking pawl 47 with the bottom seat 48 in combination with the action of second spring element 52, keeps effectively the first rotating element in the unlocking position until the intervention of the third element 33 of the first sub-assembly 15A.
  • Figure 9 shows the operating mechanism 1 in a configuration corresponding to a closing condition of the earthing switch.
  • the disk 10 is at the second angular position and consequently the first element 31 of the first sub-assembly 15A is at its reference position.
  • the first rotating element 41 of the second sub-assembly 15B abuts against the first element 31 of the first sub-assembly 15A under the action of the pair of spring elements 51A, 51B.
  • the second rotating element 42 is kept separated by the first rotating element 41 by the third element 33 of the first sub-assembly 15A.
  • such a third element 33 keeps the second rotating element 42 rotated with respect to its operative position by charging, as a consequence, the second spring element 52.
  • the opening movement W2 is the result of a rotation of the disk 10 in the counter clock wise direction about the main axis 100. Such a rotation is performed by means of the operating lever 12.
  • the first element 31 rotates with the main disk 10 causing a counter rotation of the first rotating element 41 in a clock wise direction (indicated by the arrow T2).
  • the contact between the first element 31 and the first rotating element 41 is lost. Therefore, due to the action of the pair of spring elements 51A, 51B the first rotating element 41 is rotated in the counter-clock direction (indicated by the arrow T3) up to reaches the locking position (see Figure 10 ).
  • the locking position is not only depending on the first spring elements 51A, 51B, but also on the second spring element 52 acting on the second rotating element 42, in contact with the first rotating element 41, as well as on the reference element 59, preferably fixed to the rear wall 83 of the frame 5. As shown in figure 19, in the locking position the first rotating element 59 abuts against such a reference element 59.
  • the first rotating element 41 avoids the return of the disk 10 towards the second angular position. Therefore, for an operator any re-closing movement (direction W1) is prevented.
  • the only possibility to restore the closing condition is to compete the opening movement, i.e. to rotate the disk 10 up to reach the first angular position.
  • Figure 12 shows the operating mechanism 1 when the disk 10 reaches the first angular position (i.e. earthing switch in opening condition).
  • the disk 10 ha rotated of an angle ⁇ of about 90°.
  • the action of the second element 32 of the first sub-assembly 15A is ended and the first rotating element 41 is at its unlocking position.
  • the second rotating element 42 is at its operative position for which the locking pawl 47 of the second rotating element 42 is inserted in the bottom seat 48 so that the first rotating element 41 is effectively locked.
  • the first rotating element 41 keeps the unlocking position even when, during the subsequent closing movement, the contact with the second element 32 of the first sub-assembly 15A is lost (see figure 13 ).
  • Figures 13 to 16 refer to the closing movement, i.e. the rotation of the disk 10 from the first angular position ( figure 12 ) to the second angular position ( figure 16 ).
  • the closing movement is performed by means of an upwards movement of the operating lever 12 that results in a clockwise rotation (direction W1) of the disk 10 about the main axis 100.
  • the second element 32 of the first sub-assembly 15A moves away from the first rotating element 41 locked by the second rotating element 42 (see figures 13 and 14 ).
  • the third element 33 of the first sub-assembly 15A approaches the front part 42A of the second rotating element 42 (see figure 14 ).
  • the second element 32 does not interfere with the second rotating element 42 by virtue of its installation on a main face 10A of the disk 10.
  • Figure 15 shows the operating mechanism 1 at the instant wherein the third element 33 of the first sub-assembly 15A begins to act on the second rotating element 42 rotating it in a counter-clock wise direction (indicated with L3).
  • the first element 31 has already reached a position for which the first rotating element 41 cannot reach the locking position.
  • the action of the third element 33 releases the locking pawl 47 of the second rotating element 42 from the seat 48 of the first rotating element 41 making the latter free to rotate in a counter-clock wise direction (arrow T3) under the action of the pair of spring elements 51A, 51B.
  • the first rotating element 41 can not reach the locking position and abuts against the first element 31 of the first sub-assembly 15A.
  • figure 16 shows the condition reached at the end of the closing movement, that corresponds exactly to that shown in Figure 9 .
  • Figures 9-16 are a sequence of views showing the working of the operating mechanism 1 during an opening movement and a subsequent closing movement.
  • the operating mechanism can be easily realized at industrial levels. Thus, it can be easily manufactured at competitive costs with similar installations of the state of the art.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP20170814.6A 2020-04-22 2020-04-22 Mécanisme de commande d'un commutateur de mise à la terre d'un appareillage de commutation moyenne tension Pending EP3901977A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20170814.6A EP3901977A1 (fr) 2020-04-22 2020-04-22 Mécanisme de commande d'un commutateur de mise à la terre d'un appareillage de commutation moyenne tension
CN202110210893.2A CN113539729A (zh) 2020-04-22 2021-02-25 用于控制中压开关设备的接地开关的操作机构

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20170814.6A EP3901977A1 (fr) 2020-04-22 2020-04-22 Mécanisme de commande d'un commutateur de mise à la terre d'un appareillage de commutation moyenne tension

Publications (1)

Publication Number Publication Date
EP3901977A1 true EP3901977A1 (fr) 2021-10-27

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Application Number Title Priority Date Filing Date
EP20170814.6A Pending EP3901977A1 (fr) 2020-04-22 2020-04-22 Mécanisme de commande d'un commutateur de mise à la terre d'un appareillage de commutation moyenne tension

Country Status (2)

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EP (1) EP3901977A1 (fr)
CN (1) CN113539729A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286474A1 (fr) * 1987-03-27 1988-10-12 Merlin Gerin Mécanisme de commande d'un interrupteur à trois positions
EP0563848A1 (fr) * 1992-04-01 1993-10-06 Gec Alsthom T & D GmbH Entrainement rotatif à ressort accumulateur
US5929405A (en) * 1998-05-07 1999-07-27 Eaton Corporation Interlock for electrical switching apparatus with stored energy closing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286474A1 (fr) * 1987-03-27 1988-10-12 Merlin Gerin Mécanisme de commande d'un interrupteur à trois positions
EP0563848A1 (fr) * 1992-04-01 1993-10-06 Gec Alsthom T & D GmbH Entrainement rotatif à ressort accumulateur
US5929405A (en) * 1998-05-07 1999-07-27 Eaton Corporation Interlock for electrical switching apparatus with stored energy closing

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