WO2024077339A1

WO2024077339A1 - Recloser mechanism

Info

Publication number: WO2024077339A1
Application number: PCT/AU2023/050993
Authority: WO
Inventors: Joni Tortian; Mariano Ortega; Angelica Maree Vigar; David DART; Mark Ashley Gilroy; Joshua David Kemp; Asad AHMED
Original assignee: Noja Power Switchgear Pty Ltd
Priority date: 2022-10-10
Filing date: 2023-10-10
Publication date: 2024-04-18

Abstract

An actuator mechanism for use in a switchgear to selectively operate the switchgear for controlling a flow of a current in a distribution line, the actuator mechanism comprises an actuating member operably engaged with a current interrupter of the switchgear, the actuator member movable between: a first configuration wherein the current interrupter presents a closed circuit to the current, and a second configuration wherein the current interrupter presents an open circuit to the current, wherein the actuating member is operably engaged with a first biasing arrangement for storing potential energy imparted by movement of an operator handle coupled to the actuator mechanism, whereby the first biasing arrangement discharges the potential energy as a latching force which maintains the current interrupter stably in each of the first configuration or the second configuration is overcome by actuation of the actuating member.

Description

Recloser Mechanism

TECHNICAL FIELD

[1] The present invention relates to a recloser mechanism for use in switchgear applications.

BACKGROUND

[2] Any references to methods, apparatus or documents of the prior art are not to be taken as constituting any evidence or admission that they formed, or form part of the common general knowledge.

[3] High voltage electrical works are dangerous work environments which can cause serious and sometimes fatal accidents. When a fault occurs in a distribution line, there are known solutions which can assist with the clearing a fault without the need for workers to interact with the distribution line and/or work at heights.

[4] Improvements to existing components whether by simplification and/or improved functionality may result in safer work environments with fewer injuries and/or fatalities. Such solutions are routinely sought.

SUMMARY OF INVENTION

[5] In an aspect, the invention provides an actuator mechanism for use in a switchgear to selectively operate the switchgear for controlling a flow of a current in a distribution line, the actuator mechanism comprises: an actuating member operably engaged with a current interrupter of the switchgear, the actuator member movable between: a first configuration wherein the current interrupter presents a closed circuit to the current, and a second configuration wherein the current interrupter presents an open circuit to the current, wherein the actuating member is operably engaged with a first biasing arrangement for storing potential energy imparted by movement of an operator handle coupled to the actuator mechanism, whereby the first biasing arrangement discharges the potential energy as a latching force which maintains the current interrupter stably in each of the first configuration or the second configuration is overcome by actuation of the actuating member.

[6] In an embodiment, the actuating member is movable within a carrier.

[7] In an embodiment, the carrier is movable within a sleeve.

[8] In an embodiment, the actuator mechanism further comprises a detent member for retaining the actuating member in the second configuration.

[9] In an embodiment, the detent member is coupled to a second biasing arrangement for storing potential energy used for disengaging the detent member with the actuating member to allow the actuating member to move to the first configuration.

[10] In an embodiment, the detent member and the second biasing arrangement are coupled to and movable within the carrier.

[11] In an embodiment, the potential energy being stored in the first biasing arrangement increases until the actuating member begins to move to or towards the first configuration from the second configuration. [12] In an embodiment, the potential energy being stored in the first biasing arrangement increases until the actuating member begins to move to or towards the second configuration from the first configuration.

[13] In an embodiment, the detent member pivots between an engaged position and a disengaged position.

[14] In an embodiment, the potential energy being stored in the second biasing arrangement increases as the detent member moves to or towards the engaged position.

[15] In an embodiment, the actuating member is in the second configuration when the detent member is in the engaged position.

[16] In an embodiment, the actuating member is in the second configuration when the detent member is substantially aligned with the actuating member.

[17] In an embodiment, the actuating member is in the first configuration when the detent member is in the disengaged position.

[18] In an embodiment, the actuating member is in the first configuration when the detent member is substantially out of alignment with the actuating member.

[19] In an embodiment, the detent member comprises one or more guide pins for sliding within a profile of the sleeve.

[20] In an embodiment, the carrier comprises at least two slots.

[21] In an embodiment, the detent member is constrained to a pivot angle by one of the at least two slots of the carrier.

[22] In an embodiment, the actuating member comprises one or more guide pins for sliding within a slot of the carrier. [23] In an embodiment, the potential energy being stored in the second biasing arrangement is discharged as the actuating member moves to or towards the first configuration.

[24] In an embodiment, the carrier moving towards the first configuration causes the guide pins of the detent member to move to an alignment with the profile of the sleeve such that the second biasing arrangement discharges the stored potential energy to move the detent member to the disengaged position.

[25] In an embodiment, the first biasing arrangement comprises one or more springs.

[26] In an embodiment, the one or more springs of the first biasing arrangement comprise a torsional spring.

[27] In an embodiment, the second biasing arrangement comprises one or more springs.

[28] In an embodiment, the one or more springs of the second biasing arrangement comprise a linear spring.

[29] In an embodiment, the actuator mechanism comprises a sensor for sensing the current in the distribution line.

[30] In an embodiment, the actuating member is coupled to an armature.

[31] In an embodiment, the armature is operably engaged with the current interrupter for presenting the current interrupter in an open circuit or a closed circuit when the current in the distribution line exceeds a predetermined threshold one or more times within a predetermined time period.

[32] In an embodiment, the actuating member moves the armature to the first configuration wherein the current interrupter presents in the closed circuit to the current. [33] In an embodiment, the second configuration comprises an extended configuration.

[34] In an embodiment, the first configuration comprises a retracted configuration.

[35] In an embodiment, the actuator mechanism comprises a third biasing arrangement operably engaged with the first biasing arrangement.

[36] In an embodiment, the third biasing arrangement is configured to delay the discharge of potential energy of the first biasing arrangement until the potential energy stored in the first biasing arrangement reaches a predetermined threshold.

[37] In an embodiment, the third biasing arrangement comprises a plurality of cam and latch mechanisms.

[38] In an embodiment, the third biasing arrangement comprises a pair of interference pins resiliently biased to engage with an external profile of the carrier.

[39] In an aspect, there is a method of controlling the flow of a current in a distribution line, the method comprising: providing an actuating member operably engaged with a current interrupter of the switchgear, the actuator member movable between a first configuration wherein the current interrupter presents a closed circuit to the current, and a second configuration wherein the current interrupter presents an open circuit to the current, actuating the actuating member to move to or towards either of the first configuration or the second configuration wherein the actuating member is maintained in one of the first configuration or the second configuration by a latching force; biasing the actuating member towards the other of the first configuration or the second configuration which the actuating member is retained in by storing a potential energy in a first biasing arrangement for overcoming the latching force; discharging the potential energy in response to overcome the latching force so as to assist in moving the actuating member to or towards the other of the first configuration or the second configuration.

[40] In an embodiment, the method further comprises retaining the actuating member in the configuration by engaging a detent member with the actuating member.

[41] In an embodiment, the method further comprises disengaging the detent member with the actuating member by a second biasing arrangement.

[42] In an embodiment, the method further comprises delaying discharge of the potential energy in a first biasing arrangement with a third biasing arrangement until the potential energy reaches a predetermined threshold.

[43] In another aspect, there is a recloser actuator apparatus for use in controlling the flow of current through a recloser, the recloser actuator apparatus comprising: an actuating member movable between a first configuration and a second configuration for closing and opening a current interrupter; and a biasing arrangement for biasing the actuating member towards the other of the first configuration or the second configuration to thereby open or close the current interrupter.

BRIEF DESCRIPTION OF THE DRAWINGS [44] Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of the Invention in any way. The Detailed Description will make reference to a number of drawings as follows:

Figure 1 is an isometric view of a recloser comprising an actuator mechanism according to an embodiment of the present invention.

Figure 2 is a cross section of the recloser assembly of Figure 1 having the actuator mechanism.

Figure 3 is a rear view of the actuator mechanism of Figure 2.

Figure 4 is a portion of the sleeve of the actuator mechanism of Figure 2.

Figure 5 is an isometric view of the detent member in-situ with the actuator mechanism of Figure 2.

Figure 6 is a side view of the carrier of the actuator mechanism of Figure 2.

Figure 7 is an isometric side view of the actuating shaft engaged with the carrier in the first configuration.

Figure 8 is a cross sectional side view of a third biasing arrangement in the form of a cam and latch mechanism.

Figure 8A is a cross sectional side view of the cam and latch mechanism in a latched configuration.

Figure 8B is a cross sectional side view of the cam and latch mechanism in an unlatched configuration. Figure 9 is an isometric view of the first biasing arrangement arranged in use with the cams of the cam and latch mechanism as the third biasing arrangement.

Figure 10 is a cross section of an alternative third biasing arrangement operably engaged with the carrier of the actuator mechanism in a closed configuration.

Figure 10A is a side view of the alternative third biasing arrangement of Figure 10 midway through its operation.

Figure 11 is a cross section of the third biasing arrangement of Figure 10 in an open configuration.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[45] Figure 1 illustrates a recloser assembly 10 housing an actuator mechanism 20 according to an embodiment of the present invention. While the actuator mechanism 20 of the present invention is described for use with a recloser assembly 10, it may be used in other switchgear and switchgear applications. The actuator mechanism 20 is used for selectively operating the recloser assembly 10 for controlling the flow of a current in a distribution line.

[46] The actuator mechanism 20 comprises an actuating member 22 which is operably engaged with a current interrupter 80 by way of an armature 70 which will be discussed in detail below. The actuating member 22 operably engages with the current interrupter 80 to selectively present the current interrupter 80 in one of two configurations. In a first configuration, the actuating member 22 operably engages with the current interrupter 80 to present a closed circuit to the current in the distribution line. When the actuating member 22 is in the first configuration, the current in the distribution line may freely flow through the recloser assembly 10. In a second configuration, the actuating member 22 operably engages with the current interrupter 80 to present an open circuit to the current in the distribution line. When the actuating member 22 is in the second configuration, the current in the distribution line is prevented or interrupted from flowing through the recloser assembly 10.

[47] The current in the distribution line having the recloser assembly 10 associated with the distribution line, may flow in either direction between the fuse tip 110 and the busbar 192 and/or the trunnion 194, through the current interrupter 80. The actuator mechanism 22 may be used to operate the current interrupter 80 to disrupt the current in the distribution line. The actuator mechanism 22 may be used independently or in combination with an electromechanical recloser assembly. In the preferred embodiment, the actuator mechanism 22 is coupled with a bistable electromagnetic actuator.

[48] The recloser assembly 10 is used to clear faults in the distribution line and/or to assist in the prevention of surges of electrical power which may cause damage to connected electrical components. Accordingly, the actuator mechanism 20 is configured to move between the first configuration and the second configuration quickly. The actuating member 22 is operably engaged with a first biasing arrangement 30. The actuating member 22 is stable in either of the first configuration or the second configuration. In the preferred embodiment, the actuating member 22 is coupled with an armature 70. The armature 70 stably maintains the actuating member in the first configuration and the second configuration. The armature 70 is kept in place by magnetic interaction of spaced apart magnets. The magnetic interaction between the armature 70 and the spaced apart magnets acts as a latching force. The latching force maintains the armature 70, and due to their coupled arrangement, the actuating member 22 in a stable condition in each of the first configuration and the second configuration.

[49] In the preferred embodiment, the first biasing arrangement 30 comprises a pair of torsional springs 32. The torsional springs 32 of the first biasing arrangement are operably engaged with an actuating shaft 24 of the actuator mechanism 20 to move or otherwise facilitate the moving of the actuating member 22 from one of the first configuration or the second configuration to or towards the other of the first configuration of the second configuration. The first biasing arrangement stores potential energy in the torsional springs 32 to be discharged when specific conditions are met. As the torsional springs 32 twist while the actuating member 22 moves towards one of the first configuration of the second configuration, the potential energy being stored in the first biasing arrangement increases. The actuating shaft 24 may be coupled at an end or ends to a lever 50. In the present embodiment, the actuating shaft 24 extends on opposing sides of the recloser assembly 10 and connects to lever 50 having handle 150. The actuating shaft 24 may be manually actuated by rotation of the lever 50. The movement of the handle 150 attached to lever 50 rotates the actuating shaft 24 which rotates the torsional springs 32 to store potential energy in the first biasing arrangement. The lever 50 rotates prior to the actuating member 22 moving towards the first configuration or the second configuration due to the latching force maintaining the actuating member in either of the first configuration or the second configuration. Accordingly, the latching force must be overcome before the actuating member 22 will move from the first configuration or the second configuration. Therefore, the potential energy stored in the first biasing arrangement increases as the lever 50 moves until the actuating member 22 overcomes the latching force and begins to move to or towards the other of the first configuration or the second configuration. Once the actuating member 22 begins to move, the potential energy stored in the first biasing arrangement is discharged to assist in moving the actuating member to the other configuration.

[50] Referring to Figures 2, 3, and 5, the actuator mechanism 20 further comprises a detent member 26. The detent member 26 retains the actuating member 22 in the second configuration. The detent member 26 is disengaged and out of alignment when the actuating member 22 is in the first configuration. When in the lever 50 is moving up until immediately before the actuating member 22 begins to move to the other of the first configuration or the second configuration, the torsional springs 32 are storing their maximum potential energy. The detent member 26 is configured with a second biasing arrangement. In the preferred embodiment, the second biasing arrangement comprises a single linear spring 62. In alternative embodiments, the second biasing arrangement may comprise a plurality of springs, such as two or more of linear spring 62. The actuating member 22 is configured to move to the second configuration when the lever 50 is actuated to an open position. Alternatively, or in combination, the actuating member 22 is configured to move to the second configuration in response to the armature 70 moving the actuating member 22 to the second configuration when the current in a distribution line associated with the recloser assembly 10 exceeds a predetermined threshold one or more times within a given time period.

[51] In the preferred embodiment, the actuating member 22 is moveable within a carrier 64. In addition, the detent member 26 and the linear spring 60 are coupled to and moveable within the carrier 64. The carrier slides between the first configuration and the second configuration within a sleeve 40. Figure 4 illustrates one side of the sleeve 40 of the preferred embodiment. The sleeve 40 may be comprised of multiple parts which are coupled together either releasably or permanently. As seen in Figure 4, each side of the sleeve 40 comprises a profile 42 or groove for receiving a respective one of the guide pins 262 of the detent member 26. As the detent member 26 moves with the carrier 64 relative to the sleeve 40, the guide pins 262 of the detent member 26 move along the profile 42 of the sleeve 40. The guide pins 262 of the detent member 26 move along the profile 42 in a direction as shown in Figures 4 and 5. In the preferred embodiment, the detent member 26 comprise guide pins 262 on each respective side so as to slide within respective profiles 42 of the side portions of the sleeve 40. As the guide pins 262 move relatively downwardly (wherein downwardly is relative and refers to the orientation as shown in the Figures 4 and 5) within the profile 42, the detent member 26 is moved towards engagement with the actuating member 22. The potential energy stored in the linear spring 62 of the second biasing arrangement increases as the detent member 26 moves towards alignment and engagement with the actuating member 22. Once the guide pins 262 of the detent member 26 passes a lip 44 in the profile 42 of the sleeve 40, the detent member 26 remains in substantial alignment with the actuating member 22 until moved above the lip 44 to a position wherein the potential energy stored in the second biasing arrangement can be discharged and the detent member 26 moved back out alignment with the actuating member 22. In some embodiments, the guide pins 262 of the detent member 26 may be biased outwards such that after passing over the lip 44, each of the guide pins 262 extend further outward so as to interfere with the lip 44 preventing the detent member 26 from retreating. The second biasing arrangement is preferably discharged as the actuating member 22 moves towards the first configuration. The profile 42 of the sleeve 40 confines the guide pins 262 to a predetermined path of motion in a single direction. In the preferred embodiment, the profile appears to cause the detent member 26 to pivot in and out of alignment with the actuating member 22. Therefore, the detent member 26 pivots in and out of engagement with the actuating member 22. As the detent member 26 is moved towards engagement with the actuating member 22, the second biasing arrangement, comprising linear spring 62, begins to store potential energy. The maximum potential energy stored in the linear spring 62 of the second biasing arrangement occurs when the detent member 26 is substantially aligned with the actuating member 22. Accordingly, the maximum potential energy stored in the linear spring 62 of the second biasing arrangement occurs after the respective guide pins 262 pass lip 64 of the profile 42 of the sleeve 40. The detent member 26 is positioned at the narrowest point of the profile 42 (shown at the lowest point of the profile 42 seen in Figures 4 and 5) when the actuating member 22 is in the second configuration. The potential energy in the linear spring 60 is discharged and the detent member 26 out of alignment with the actuating member 22 when the actuating member 22 is the first configuration.

[52] As mentioned above and seen best in Figures 2 and 3, in the preferred embodiment, the detent member 26 and the linear spring 62 are supported by carrier 64 which slides within the sleeve 40. The carrier 64 provides openings 364 for receiving a respective pivot pin 264 positioned on each side of the detent member 26 as seen in Figure 6. The carrier 64 comprises at least two slots. A substantially horizontal slot 66 for receiving the guide pins 262 of the detent member 26 to allow the detent member 26 to pivot in and out of alignment with the actuating member 22. A substantially vertical slot 67 for receiving one or more guide pins (not shown) of the actuating member 22 for allowing the actuating member 22 to move along the length of the substantially vertical slot 67. The guide pins of the actuating member 22 generally slide up and down in a vertical slot 67. The actuating member 22 is moved downwards by the carrier 64 when the guide pins of the actuating member 22 are positioned at the top of the substantially vertical slot 67 and the carrier 64 slides downward within the sleeve 40. Further, the detent member 26 is constrained to pivoting in a pivot angle defined by an arcuate slot 66 of the carrier 64. Generally speaking, the guide pins 262 of the detent member 26 of the extend through the slot 66 of the carrier 64 and slide within the profile 42 of the sleeve 40. As best understood from Figures 6 and 7, the actuator mechanism 20 further comprises a push rod 68 which is positioned spaced from the actuating shaft 24. The push rod 68 threads through aperture 368 of the carrier 64. Accordingly, when the actuating shaft 24 is rotated, the push rod 68 pushes the carrier 64 up and down within the sleeve 40. Directional terms used herein are used with reference to the orientation of the invention as provided in the Figures. Accordingly, these directional terms i.e. vertical, horizontal, highest, lowest, upper, lower are provided in the context of the Figures and should not be interpreted as limiting in any way. The person skilled in the art would readily understand the manner and context in which they are used.

[53] As seen in Figure 2 and mentioned above, in the preferred embodiment the actuating member 22 is coupled to the armature 70. The armature 70 is operated by an electromagnetic coil 16. The electromagnetic coil 16 is configured to move according to the current in the distribution line. In the preferred embodiment, the armature 70 is coupled to the actuating member 22 by way of a connecting rod 220 for transferring axial motion. The actuator mechanism 20 preferably comprises a sensor, such as a Rogowski coil 90, for sensing the current in the distribution line. The Rogowski coil 90 in the preferred embodiment is positioned immediately below the current interrupter 80. The armature 70 is configured to move the actuating member 22 according to the current in the distribution line. Where the Rogowski coil 90 senses a current which exceeds a predetermined threshold one or more times within a given time period, an energisation current is applied to the coil 16 such that the armature 70 is configured to apply an impact force to the actuating member 22. As the detent member 26 and the actuating member 22 are out of alignment when in the first configuration, the electromagnetic coil 16 can operate the armature 70 and move the actuating member 22 between the first configuration and the second configuration independently of the lever 50 being actuated. As mentioned above, moving the actuating member 22 from the first configuration to the second configuration will move the armature 70 to a position whereby the current interrupter 80 presents an open circuit to the current in the distribution line, thereby interrupting the flow of current in the distribution line. When the actuating member 22 is moved back to the first configuration, the armature 70 moves to a position whereby the current interrupter 80 presents in a closed circuit, thereby allowing the current in the distribution line to flow freely in the distribution line. As noted above, provided the lever 50 is in the closed position, the armature 70 may move the actuating member 22 independently of the actuator mechanism 20.

[54] In the preferred embodiment, the first configuration comprises a retracted configuration. The actuating member 22 and the detent member 26 are adjacent to each other and out of alignment in the retracted. Furthermore, the carrier is not extended. The retracted configuration being where the actuating member 22 is generally retracted into the actuator mechanism 20. In the preferred embodiment, the second configuration comprises an extended configuration. The actuating member 22 and the detent member 26 are in alignment in the extended configuration. Furthermore, the carrier is extended. The extended configuration being where the actuating member 22 is relatively extended away from the actuator mechanism 20. [55] Referring to Figures 8, 8A, 8B and 9 there is provided a preferred third biasing arrangement for use with the actuator mechanism 20. The third biasing arrangement comprises a cam and latch mechanism 310 coupled with the torsional spring 32 of the first biasing arrangement. In the preferred embodiment, the third biasing arrangement comprises two cam and latch mechanism 310. Each of the cam and latch mechanisms 310 is located on either side of the actuator shaft 24 and each one being operably engaged with a respective one of the torsional springs 32. The cam latch mechanism 310 on one side is a mirror in function. However, the cam and latch mechanisms 310 of the third biasing arrangement are rotationally offset. This rotational offset allows latching to occur with opening of the lever 50 as well as when closing of the lever 50. This ensures that the torsional springs 32 charge upon actuating the lever 50 from the first configuration to the second configuration and vice versa.

[56] Each of the cam and latch mechanism comprises an inner cam 312 and an outer cam 314. Each of the latches 316 comprise respective faces for engaging with each of the respective inner cam 312 and the respective outer cam 314. The inner cams 312 and the push rod 68 of the actuating mechanism 20 are rigidly connected. As such, rotation of the inner cams 312 will result in movement of the push rod 68 between the first configuration and the second configuration as described above. The outer cams 314 are rigidly connected with the lever 50. The inner cams 312 are operably engaged with one end of a respective one of the torsional springs 32. The outer cams 314 are operably engaged with the other end of the respective one of the torsional springs 32. Each of the latches 316 are biased towards the centre of rotation of the cams 312, 314.

[57] Referring to Figure 8 through Figures 8A and 8B, the cam and latch mechanism 310 of the third biasing arrangement is in the latched condition on one side. When one of the cam and latch mechanism 310 is in the latched condition, the other is in the unlatched condition. Accordingly, latching of one of the cam and latch mechanisms 310 occurs when the lever 50 is actuated and in either the first configuration or the second configuration. In this orientation, the cams 312, 314 are rotating or trying to rotate in an anticlockwise direction which is the same direction the lever 50 is being actuated.

[58] As the lever 50 is actuated, the latch 316 prevents movement of the inner cam 312 by abutting of an inner cam face 322 and inner latch face 326 (as best seen in Figure 8 but features labelled in Figures 8A and 8B). As the lever 50 is continued to be actuated the outer cam 314 rotates one end of the torsional spring relative the other end which in turn charges up the torsional springs 32 of the first biasing arrangement with potential energy. As the outer cam 314 continues to rotate, an outer cam face 324 and an outer latch face 336 begin to engage. The geometry of the cams is arranged such that once the outer cam 314 reaches a predetermined rotation, the torsional springs 32 are sufficiently charged. The outer cam face 324 and outer latch face 336 are shaped such that further engagement produces a resultant force which causes the latch 316 to move upwards and away from the inner cam 312 and the outer cam 314. The engagement of outer cam face 324 with outer latch face 336 unlatches the latch 316 by moving inner cam face 322 out of engagement with inner latch face 326. The unlatching of the latch 316 by disengaging inner cam face 322 with inner latch face 326 allows the discharge of potential energy from the torsional springs 32 of the first biasing arrangement. As discussed above, the discharging of the potential energy of the first biasing arrangement moves the carrier 64 within the sleeve 40 to either the first configuration or the second configuration according to the direction of the actuation of the lever 50. Upon discharge of the torsional springs 32, the other latch 316 which was not engaged moves into an engaged position and the process repeats for the actuation of the lever in the opposite direction. The previously latched latch 316 remains unlatched until the newly latched latch moves through the cycle by actuation of the lever 50 and discharge of the torsional springs 32. Accordingly, as the inner cams 312 are rigidly connected, the latching of one side charges both of the torsional springs 32 of the first biasing arrangement. The third biasing arrangement ensures that when the first biasing arrangement is discharged, there is sufficient energy to overcome losses from friction and/or other limitations in the actuator mechanism 20.

[59] Figure 9 illustrates the inner cam 312 and the outer cam 314 engaged with the torsional springs 32. Stub 50A provides a connection point for lever 50A to be attached to the actuating shaft 24 of the actuator mechanism 20 so as to impart a torque to manually operate the actuator mechanism 20. The third biasing arrangement delays the discharge of the energy of the first biasing arrangement until there is sufficient energy to ensure the carrier 64 can be moved from the first configuration to the second configuration and vice versa.

[60] Referring to Figures 10 and 11 there is provided an alternative third biasing arrangement. This alternative third biasing arrangement provides similar functionality through different means. As seen in Figure 10, there is provided the carrier 64 having projections 464 projecting outwards from the carrier 64 on opposing sides. In the preferred embodiment, the projections 464 are triangular in shape, however, they may be any shape which can act as a ramp. This will be explained in further detail below.

[61] In the alternative, the third biasing arrangement may incorporate resiliently biased interference pins 466. The interference pins 466 are configured to engage with the projections 464 to delay the movement of the carrier 64 across the interference pins 466. The interference pins 466 are adapted to resiliently retract by way of springs to move out of interference with the projections 464 upon application of a sufficient force to overcome the force applied by the compression of springs 468. The delay provided by the interference pins 466 provides further charging of the first biasing arrangement. As detailed above, the carrier 64 is connected to the actuating shaft 24 by threading through aperture 368 of the carrier 64. Accordingly, as the lever 50 is actuated the torsional springs 32 of the first biasing arrangement will charge until the potential energy built up in the torsional springs 32 is sufficient to move the carrier from the first configuration to the second configuration or vice versa. As the lever 50 is continued to be actuated, the downward force on the carrier 64 will increase thereby increasing the pressure from the projections 464 on the interference pins 466. The springs 468 are compressed against their respective housings which may be within the sleeve 40 or otherwise coupled with the sleeve 40. This continue until the force is sufficient to compress the springs 468 as seen in Figure 10A. The springs 468 are chosen so as to provide sufficient stiffness such that the torsional springs 32 can charge to a predetermined threshold before the interference pins 466 are able to be moved by the projections 464. Once the projections 464 on the carrier 64 apply a force on the interference pins 466 thereby compressing the projections 464 to a max compression, the projections 464 move past the respective interference pins 466. Once past the interference pins 466, the first biasing arrangement is free to discharge the potential energy stored in the torsional springs 32.

[62] In the first configuration, as seen in Figure 10, where the lever 50 has not been actuated, the projections 464 and the interference pins 466 may not be touching or may be abutting. Similarly, as seen in Figure 11 , after the lever 50 has been fully actuated and the projections 464 have moved past the interference pins 466, the respective faces of the projections 464, the interference pins 466 may not touch or may be abutting until the lever 50 begins to be actuated. The carrier 64 may be limited in movement after passing over the interference pins 466 by providing limited space for the interference pins 466 to slide relative to the carrier 64.

[63] The method of controlling the flow of a current in a distribution line will now be described with respect to the Figures generally.

[64] The method of controlling the flow of a current in a distribution line comprises providing an actuating member 22 configured as described herein and installed in a recloser assembly 10. The actuating member 22 being stably maintained in a first configuration and a second configuration. The actuating member 22 being biased towards the other of the first configuration or the second configuration as the lever 50 moves towards said other of the first or the second configuration. The present invention comprising the first biasing arrangement. The first biasing arrangement preferably being configured using one or more torsional springs 62. Wherein potential energy is stored in the one or more torsional springs 62 as the lever 50 is actuated and the actuating member stays in either of the first configuration or the second configuration. The potential energy stored in the torsional springs 62 is discharged as the actuating member begins to move to the other of the first configuration or the second configuration.

[65] In some embodiments, the charging or storing of potential energy in the one or more torsional springs 32 of the first biasing arrangement may be assisted by a third biasing arrangement. As described above, the third biasing arrangement may implement a cam ans latch mechanisms 310 to delay the discharge of the torsional springs 32 until a sufficient predetermined potential energy in the torsional springs 32 has been met. Alternatively, interference pins 466 and projections 464 on the carrier 64 may delay movement of the carrier 64 while the lever 50 is being actuated allowing the torsional springs 32 to charge or store sufficient energy to be released all at once when moving the carrier 64 from a first configuration to a second configuration or vice versa. The third biasing configuration advantageously ensures that the torsional springs 32 are only discharged when there is sufficient energy to move the carrier 64 between the first configuration and the second configuration or vice versa.

[66] The preferred embodiment is preferably configured with a bistable actuator such that the bistable actuator can present the current interrupter 80 in the open circuit even while the lever 50 is in the closed position. However, if the lever 50 is in the open position the current interrupter 80 will always be presented in an open circuit. The present invention provides a sensor, such as Rogowski coil 90, in a configuration to measure the current in a distribution line. As mentioned above, the Rogowski coil 90 is positioned immediately below the current interrupter 80. When the Rogowski coil 90 senses one or more surges in current which exceed a predetermined threshold within a time period, the armature 70 is configured to move to the actuating member 22 to the second configuration.

[67] The actuating member 22 may be retained in the second configuration by the detent member 26. The detent member 26 may abut or otherwise engage the actuating member 22 to maintain in the second configuration. The second biasing arrangement may be triggered when the actuating member 22 move towards the first configuration and the guide pins 262 of the detent member 26 move above the lip 44 in alignment with the slot and the linear spring 60. The potential energy stored in the linear spring 60 of the second biasing arrangement discharges to disengage the detent member 26 with the actuating member 22.

[68] In use the actuator mechanism 20 is particularly beneficial for quickly responding to a surge when coupled with an electromechanical recloser assembly. The present invention is preferably configured to be capable of an actuator mechanism response time of approximately 50 milliseconds. However, the actual response time may vary based on the components used. The present invention may also be advantageous in the resetting process without requiring complex and additional movements.

[69] In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. The term “comprises” and its variations, such as “comprising” and “comprised of” is used throughout in an inclusive sense and not to the exclusion of any additional features.

[70] It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the invention into effect.

[71] The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted by those skilled in the art.

Claims

1. An actuator mechanism for use in a switchgear to selectively operate the switchgear for controlling a flow of a current in a distribution line, the actuator mechanism comprises: an actuating member operably engaged with a current interrupter of the switchgear, the actuator member movable between: a first configuration wherein the current interrupter presents a closed circuit to the current, and a second configuration wherein the current interrupter presents an open circuit to the current, wherein the actuating member is operably engaged with a first biasing arrangement for storing potential energy imparted by movement of an operator handle coupled to the actuator mechanism, whereby the first biasing arrangement discharges the potential energy as a latching force which maintains the current interrupter stably in each of the first configuration or the second configuration is overcome by actuation of the actuating member.

2. An actuator mechanism according to claim 1 , wherein the actuating member is movable within a carrier.

3. An actuator mechanism according to claim 2, wherein the carrier is movable within a sleeve.

4. An actuator mechanism according to claim 2 or 3, wherein the actuator mechanism further comprises a detent member for retaining the actuating member in the second configuration.

5. An actuator mechanism according to any one of claims 2 to 4, wherein the detent member is coupled to a second biasing arrangement for storing potential energy used for disengaging the detent member with the actuating member to allow the actuating member to move to the first configuration.

6. An actuator mechanism according to any one of claims 2 to 5, wherein the detent member and the second biasing arrangement are coupled to and movable within the carrier.

7. An actuator mechanism according to any one of claims 2 to 6, wherein the potential energy being stored in the first biasing arrangement increases until the actuating member begins to move to or towards the first configuration from the second configuration.

8. An actuator mechanism according to any one of claims 2 to 7, wherein the potential energy being stored in the first biasing arrangement increases until the actuating member begins to move to or towards the second configuration from the first configuration.

9. An actuator mechanism according to any one of claims 2 to 8, wherein the detent member pivots between an engaged position and a disengaged position.

10. An actuator mechanism according to any one of claims 2 to 9, wherein the potential energy being stored in the second biasing arrangement increases as the detent member moves to or towards the engaged position.

11. An actuator mechanism according to any one of claims 2 to 10, wherein the actuating member is in the second configuration when the detent member is in the engaged position.

12. An actuator mechanism according to any one of claims 2 to 11 , wherein the actuating member is in the second configuration when the detent member is substantially aligned with the actuating member.

13. An actuator mechanism according to any one of claims 2 to 12, wherein the actuating member is in the first configuration when the detent member is in the disengaged position.

14. An actuator mechanism according to any one of claims 2 to 13, wherein the actuating member is in the first configuration when the detent member is substantially out of alignment with the actuating member.

15. An actuator mechanism according to any one of claims 2 to 14, wherein the detent member comprises one or more guide pins for sliding within a profile of the sleeve.

16. An actuator mechanism according to any one of claims 2 to 15, wherein the carrier comprises at least two slots.

17. An actuator mechanism according to any one of claims 2 to 16, wherein the detent member is constrained to a pivot angle by one of the at least two slots of the carrier.

18. An actuator mechanism according to any one of claims 2 to 17, wherein the actuating member comprises one or more guide pins for sliding within a slot of the carrier.

19. An actuator mechanism according to any one of claims 2 to 18, wherein the potential energy being stored in the second biasing arrangement is discharged as the actuating member moves to or towards the first configuration.

20. An actuator mechanism according to any one of claims 2 to 19, wherein the carrier moving towards the first configuration causes the guide pins of the detent member to move to an alignment with the profile of the sleeve such that the second biasing arrangement discharges the stored potential energy to move the detent member to the disengaged position.

21. An actuator mechanism according to any one of claims 2 to 20, wherein the first biasing arrangement comprises one or more springs.

22. An actuator mechanism according to any one of claims 2 to 21 , wherein the one or more springs of the first biasing arrangement comprise a torsional spring.

23. An actuator mechanism according to any one of claims 2 to 22, wherein the second biasing arrangement comprises one or more springs.

24. An actuator mechanism according to any one of claims 2 to 23, wherein the one or more springs of the second biasing arrangement comprise a linear spring.

25. An actuator mechanism according to any one of claims 2 to 24, wherein the actuator mechanism comprises a sensor for sensing the current in the distribution line.

26. An actuator mechanism according to any one of claims 2 to 25, wherein the actuating member is coupled to an armature.

27. An actuator mechanism according to claim 26, wherein the armature is operably engaged with the current interrupter for presenting the current interrupter in an open circuit or a closed circuit when the current in the distribution line exceeds a predetermined threshold one or more times within a predetermined time period.

28. An actuator mechanism according to claims 26 to 27, wherein the actuating member moves the armature to the first configuration wherein the current interrupter presents in the closed circuit to the current.

29. An actuator mechanism according to any one of claims 1 to 28, wherein the actuator mechanism comprises a third biasing arrangement operably engaged with the first biasing arrangement.

30. An actuator mechanism according to claim 29, wherein the third biasing arrangement is configured to delay the discharge of potential energy of the first biasing arrangement until the potential energy stored in the first biasing arrangement reaches a predetermined threshold.

31. An actuator mechanism according to claim 29 or 30, wherein the third biasing arrangement comprises a plurality of cam and latch mechanisms.

32. An actuator mechanism according to claim 29 or 30 when dependent on claim 2, wherein the third biasing arrangement comprises a pair of interference pins resiliently biased to engage with an external profile of the carrier.

33. A method of controlling the flow of a current in a distribution line, the method comprising: providing an actuating member operably engaged with a current interrupter of the switchgear, the actuator member movable between a first configuration wherein the current interrupter presents a closed circuit to the current, and a second configuration wherein the current interrupter presents an open circuit to the current, actuating the actuating member to move to or towards either of the first configuration or the second configuration wherein the actuating member is maintained in one of the first configuration or the second configuration by a latching force; biasing the actuating member towards the other of the first configuration or the second configuration which the actuating member is retained in by storing a potential energy in a first biasing arrangement for overcoming the latching force; discharging the potential energy in response to overcome the latching force so as to assist in moving the actuating member to or towards the other of the first configuration or the second configuration.

34. The method of claim 33, further comprising retaining the actuating member in the configuration by engaging a detent member with the actuating member.

35. The method of claim 34, further comprising disengaging the detent member with the actuating member by a second biasing arrangement.

36. The method of claim 33, further comprising delaying discharge of the potential energy in a first biasing arrangement with a third biasing arrangement until the potential energy reaches a predetermined threshold.