CN213519722U - Interlocking device between three-station mechanism and circuit breaker mechanism and ring main unit - Google Patents

Abstract

The utility model provides an interlock and looped netowrk cabinet that is used for between three station mechanisms and the circuit breaker mechanism, interlock includes: a first cable, one end of which is connected to the isolation operation hole blocking cover, and the first cable is pulled when the isolation operation hole blocking cover is rotated in a first direction from a closed position to an open position when the circuit breaker mechanism is in a brake-off state; a rotating member pivotably installed in the circuit breaker mechanism, the other end of the first cable being connected to a first end of the rotating member, the rotating member rotating in a second direction opposite to the first direction when the first cable is pulled by the isolation operation hole blocking cover; a second cable having one end connected to the rotating member and pulled when the rotating member rotates in a second direction; the driving medium is connected to the other end of second cable, and when the second cable received the pulling of rotating member, the driving medium was rotatory along first direction, can be connected with an indicator at rotatory in-process, and indicator pivotally ground is installed in circuit breaker mechanism, and the rotation of driving medium drives indicator pivot.

Description

Interlocking device between three-station mechanism and circuit breaker mechanism and ring main unit

Technical Field

The utility model relates to an interlock and looped netowrk cabinet that are used for between three station mechanisms and the circuit breaker mechanism.

Background

The circuit breaker cabinet of looped netowrk cabinet includes three station mechanisms and circuit breaker mechanism, because of three station mechanisms are different for the arrangement mode of circuit breaker, three station mechanisms divide into and keep apart three station mechanisms down on last. The interlocking device between the upper isolation three-station mechanism and the circuit breaker mechanism is not generally applicable to the interlocking device between the lower isolation three-station mechanism and the circuit breaker mechanism, so that the interlocking device which can be universally used for the upper isolation three-station mechanism or the lower isolation three-station mechanism and the circuit breaker mechanism is needed, the requirements of preventing an isolating switch from being switched on and off with load and preventing a grounding switch from being switched on in five-prevention are met, the three-station operating mechanism cannot be operated when the circuit breaker mechanism is switched on, and the circuit breaker mechanism must be switched off when the three-station operating mechanism is operated.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an interlock that is used for between three station mechanisms and the circuit breaker mechanism, three station mechanisms are including keeping apart operating device and ground connection operating device, keep apart operating device and keep apart the handle hole fender lid including can be at closed position and opening the rotatory isolation handle hole fender lid between the position, at closed position, keep apart the handle hole fender lid and shelter from keeping apart the handle hole to prevent that operating handle from inserting and keep apart the handle hole, opening the position, keep apart the handle hole fender lid and make the isolation handle hole expose, operating handle can insert and keep apart the handle hole, interlock includes: a first cable, one end of which is connected to the isolation operation hole blocking cover, and the first cable is pulled when the isolation operation hole blocking cover is rotated in a first direction from a closed position to an open position when the circuit breaker mechanism is in a brake-off state; a rotating member pivotably installed in the circuit breaker mechanism, the other end of the first cable being connected to a first end of the rotating member, the rotating member rotating in a second direction opposite to the first direction when the first cable is pulled by the isolation operation hole blocking cover; a second cable having one end connected to the rotating member and pulled when the rotating member rotates in a second direction; the driving medium is connected to the other end of second cable, and when the second cable received the pulling of rotating member, the driving medium was rotatory along first direction, can be connected with an indicator at rotatory in-process, but indicator pivot ground is installed in circuit breaker mechanism for the rotation of driving medium drives indicator pivot, can not close a floodgate when protection circuit breaker mechanism energy storage state.

Advantageously, the interlock further comprises a support plate mounted within the circuit breaker mechanism, the rotary member being pivotally mounted on the support plate.

Advantageously, the interlock device further includes an elastic member having one end connected to the second end of the rotating member and the other end connected to the support plate, the elastic member being stretched when the rotating member rotates in the second direction, and rotating the rotating member in the first direction by a restoring force when application of the rotational force to the isolating operation hole blocking cover is stopped, thereby restoring the first cable.

Advantageously, the circuit breaker mechanism comprises a stop fixedly connected to the main shaft of the circuit breaker mechanism, the stop being not located on the rotation path of the rotary member in the opening state of the circuit breaker mechanism, the stop being located on the rotation path of the rotary member in the closing state of the circuit breaker mechanism so as to block the rotation of the rotary member in the second direction and thus prevent the rotation of the isolating operation hole shutter from the closed position to the open position.

Advantageously, the first cable is connected to the isolation operating hole cover via a ring, and the interlock further includes a baffle provided on the isolation operating mechanism, the baffle having a circular arc surface along which the isolation operating hole cover pulls the ring of the first cable when the isolation operating hole cover rotates from the closed position to the open position.

Advantageously, the shutter further includes an arc guide portion that guides the first cable when the first cable is pulled.

Advantageously, the interlock further comprises a drive member having a waisted bore in which the second end of the rotary member is received via a pin such that rotation of the rotary member in the second direction translates the second end of the rotary member within the waisted bore without causing movement of the drive member.

Advantageously, the ground operating mechanism further includes a ground operating hole blocking cover rotatable between a closed position in which the ground operating hole blocking cover blocks the ground operating hole to prevent the operating handle from being inserted into the ground operating hole and an open position in which the ground operating hole blocking cover exposes the ground operating hole, the operating handle being insertable into the ground operating hole, the ground operating hole blocking cover being connected to the driving member via a connecting member, and the driving member being pulled to move and rotate the rotating member in the second direction via the second end of the rotating member when the ground operating hole blocking cover is rotated in the second direction from the closed position to the open position in the opening state of the circuit breaker mechanism.

Advantageously, a support is provided below the drive member to support the drive member and prevent the drive member from tilting during movement.

Advantageously, the three-position operating mechanism is used for an upper disconnecting circuit breaker mechanism.

Advantageously, the ground operating mechanism further comprises a ground operating hole blocking cover rotatable between a closed position in which the ground operating hole blocking cover blocks the ground operating hole to prevent the operating handle from being inserted into the ground operating hole and an open position in which the ground operating hole blocking cover exposes the ground operating hole, the operating handle being insertable into the ground operating hole, the ground operating hole blocking cover being connected to the rotary member via a third cable, the third cable being pulled when the ground operating hole blocking cover is rotated in the first direction from the closed position to the open position in the opening state of the circuit breaker mechanism, thereby causing the rotary member to rotate the transmission member and thereby causing the indicator member to pivot.

Advantageously, the three-position operating mechanism is used for a lower disconnecting circuit breaker mechanism.

The utility model also provides a looped netowrk cabinet, including three station mechanisms, circuit breaker mechanism and as above interlock.

Drawings

The advantages and objects of the present invention will be better understood from the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the relationship of the various components. In the drawings:

fig. 1 shows the utility model discloses a perspective view of looped netowrk cabinet, wherein, three station mechanism show to keep apart three station mechanisms on, and circuit breaker mechanism shows to be the separating brake state.

Fig. 2 shows a perspective view of a flap of the locking device.

Fig. 3 shows a perspective view of the support plate of the locking device.

Fig. 4 shows a perspective view of the rotating part of the locking device.

Fig. 5 shows a perspective view of the drive element of the locking device.

Fig. 6 shows a perspective view of the circuit breaker mechanism with the stop preventing rotation of the rotary member.

Fig. 7a, 7b and 7c are enlarged views showing the connection between the first cable, the barrier and the isolation operating hole barrier cover.

Fig. 8a and 8b are enlarged views showing the connection between the driving member and the ground operating hole blocking cover.

Fig. 9 shows a schematic view of an indicator of the circuit breaker mechanism.

Fig. 10a and 10b show a driving process when the blocking cover of the disconnecting operation hole of the circuit breaker mechanism is opened in the opening state of the circuit breaker mechanism.

Fig. 11a and 11b show a driving process when the blocking cover of the disconnecting operation hole of the circuit breaker mechanism is closed in the opening state of the circuit breaker mechanism.

Fig. 12a and 12b show a driving process when the ground operation hole blocking cover of the circuit breaker mechanism is opened in the opening state of the circuit breaker mechanism.

Fig. 13a and 13b show the driving process when the ground operation hole blocking cover of the circuit breaker mechanism is closed in the opening state of the circuit breaker mechanism.

Fig. 14a and 14b are schematic views showing a stopper of the circuit breaker mechanism preventing the rotation of the rotary member in a closed state of the circuit breaker mechanism.

Fig. 15 shows the utility model discloses a perspective view of looped netowrk cabinet, wherein, three station operating device show to keep apart three station mechanisms down, and circuit breaker mechanism shows to be the separating brake state.

Detailed Description

Various embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Here, it is to be noted that, in the drawings, the same reference numerals are given to constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted. The terms "first direction", "second direction", "rotational direction", and the like herein are described with respect to the drawings of the present invention, unless otherwise specified. The term "sequentially comprising A, B, C, etc" merely indicates the order of the included elements A, B, C, etc. and does not exclude the possibility of including other elements between a and B and/or between B and C. The "left" and "right" directions are described with respect to the drawings of the present invention.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to fig. 1 to 15.

First, referring to fig. 1, a perspective view of the ring main unit according to the present invention is shown, wherein the three-position mechanism 1 is shown as an upper isolation three-position mechanism, and the circuit breaker mechanism 2 is shown as an open state. The three-station mechanism comprises an isolation operating mechanism and a grounding operating mechanism. The isolating operation mechanism includes an isolating operation hole shutter 11 and the ground operation mechanism includes a ground operation hole shutter 12, both of which are movable between a closed position and an open position. At the closed position of keeping apart the handle hole and keeping off the lid, keep apart the handle hole and keep off the handle hole that the lid shelters from to keep apart for operating handle can not insert and keep apart the handle hole and operate, keeps apart the open position that the handle hole kept off the lid, keeps apart the handle hole and keeps off the lid and make and keep apart the handle hole and expose, makes operating handle can insert and keep apart the handle hole and operate. Similarly, at the closed position of ground connection handle hole fender lid, ground connection handle hole fender lid shelters from the ground connection handle hole for operating handle can not insert the ground connection handle hole and operate, and at the open position of ground connection handle hole fender lid, ground connection handle hole fender lid makes the ground connection handle hole expose, makes operating handle can insert the ground connection handle hole and operate. When keeping apart the operation hole fender lid and being in open position, ground connection operation hole fender lid is in closed position, keeps apart operation hole fender lid and is in closed position when ground connection operation hole fender lid is in open position, does not have the condition that keeps apart operation hole fender lid and ground connection operation hole fender lid and be in open position simultaneously, and this is realized by the structure of three station mechanism self, does not belong to the discussion scope of this application, consequently no longer gives unnecessary details.

The interlock between the disconnecting operation mechanism and the circuit breaker mechanism includes a first cable 31 having one end connected to the disconnecting operation hole blocking cover 11 through an opening 333 in the blocking plate 33 (shown in fig. 2) by a ring 311 (shown in fig. 7a, showing that the first cable is not pulled) and the other end connected to a rotary member 32 (described later). The shutter 33 is provided on the circuit breaker mechanism with a circular arc surface 331 (shown in fig. 7b as the first cable is pulled) facing the circular ring 311 so that when the isolation operation hole shutter is rotated from the closed position to the open position, the circular ring 311 of the first cable is pulled to move along the circular arc surface and the circular arc surface prevents the circular ring from coming off. The baffle also has an arcuate guide portion 332 (shown in fig. 7 c) that guides the first cable as it is pulled, reducing friction during pulling of the first cable.

As shown in fig. 3, the interlock device also includes a support plate 34 that is mounted to the circuit breaker mechanism. As shown in fig. 4, the rotating member 35 is rotatably mounted to the support plate 34 via a pivot 341, the pivot 341 passes through two holes 354 of the rotating member 35, and a first cable passes through the support plate via a hole 342 to be connected to a first end 351 of the rotating member 35. The second end 352 of the rotating member 35 is connected to one end of an elastic member 36, and the other end of the elastic member 36 is connected to the supporting plate 34 (shown at 343 in fig. 3). The rotating member 35 further includes a mating member 355, and in the closed state of the circuit breaker mechanism, the stop 22 of the circuit breaker mechanism is adjacent to the mating member of the rotating member to block the rotating member from rotating, as shown in fig. 6. In the closed position, the stop member 22 is close to the mating member 355, but a small gap is present therebetween to prevent the stop member 22 from colliding with the rotary member 6 during closing of the circuit breaker mechanism, thereby damaging the rotary member 6.

As shown in fig. 5, the interlock device further includes an actuating member 37 having an opening 375 at one end into which a connector 374 is inserted to connect the actuating member to the ground access aperture cover (as shown in fig. 8a and 8 b), and a long waist aperture 371 at the other end into which the second end of the rotary member is received by a pin 353 such that the second end of the rotary member is movable within the long waist aperture 371 via the pin when the rotary member is rotated. Below the driving member 37, there is provided a support member 372 mounted to the support plate 34 to support the driving member 37.

The interlock device further includes a second cable 38, one end of which 38 is connected to the rotary member 35 through the hole 344 of the support plate so that the second cable can be pulled when the rotary member 35 rotates. The other end of the second cable 38 is connected to a transmission member 39, the transmission member 39 is pivotally mounted on the circuit breaker mechanism via a pivot 391 and is connected to an indicating member 21 (shown in fig. 9) of the circuit breaker mechanism, and the indicating member is pivotally mounted on the circuit breaker mechanism and can pivot under the action of the transmission member to ensure that the circuit breaker mechanism cannot be switched on in the energy storage state.

Next, with reference to fig. 10a and 10b, a description will be given of a transmission process when the disconnecting operation hole blocking cover is rotated from the closed position to the open position in the opening state of the circuit breaker mechanism.

In the opening state of the circuit breaker mechanism, i.e., the stopper 22 of the circuit breaker mechanism does not block the rotary piece 35, the isolation operation aperture cover 11 is rotated in the first direction (clockwise direction) as shown by the arrow a, which causes the first cable 31 to be pulled in the direction shown by the arrow B, i.e., the ring 311 of the first cable 31 moves along the arc surface 331 of the shutter 33 and is guided by the arc-shaped guide portion 332 of the shutter. Movement of the first cable in the direction of arrow B causes the rotary member 35 to rotate in a second direction (anti-clockwise) opposite to the first direction, as indicated by arrow C, during which the second end 352 of the rotary member 35 moves via the pin 353 to the left in the oblong hole 371 of the driving member 37 without moving the driving member, pulling the elastic member 36 to extend and store energy. The second cable 38 is pulled by the rotating member 35 to move in the direction of arrow D, which causes the transmission member 39 to rotate in the clockwise direction as indicated by arrow E. Furthermore, the indicator 21 pivots (as shown in fig. 9) and ensures, by means of other transmission mechanisms inside the circuit breaker mechanism, that the circuit breaker mechanism cannot be closed in the stored energy state. As shown in fig. 9, one end of the indicator 21 can move in the groove, when the indicator 21 pivots clockwise, the indicator 21 moves to abut against the left end of the groove, when the indicator 21 pivots counterclockwise, the indicator 21 moves to abut against the right end of the groove, the indicator 21 abuts against the left end or the right end, and further through other transmission mechanisms of the breaker mechanism, it is finally ensured that the breaker mechanism cannot be switched on in the energy storage state. The function of the indicator will be apparent to those skilled in the art and will not be described in detail here.

Next, referring to fig. 11a and 11b, a description will be given of a driving process when the disconnecting operation hole blocking cover is rotated from the open position to the closed position in the opening state of the circuit breaker mechanism.

In the opening state of the circuit breaker mechanism, in the case where the force for rotating the isolating operation hole blocking cover in the clockwise direction is removed and the operation handle is not inserted into the isolating operation hole, the isolating operation hole blocking cover is rotated in the counterclockwise direction by its own return spring, as shown by an arrow a' in the drawing. Meanwhile, since the force for moving the first cable in the arrow B disappears, the rotating member moves in the clockwise direction by the restoring force of the elastic member 36, as indicated by the arrow C ', thereby pulling the first cable 31 back to the original position in the arrow B'. In the process, the second end 352 of the rotary member 35 moves to the right in the long kidney hole 371 of the driving member 37 via the pin 353 without moving the driving member. At the same time, the transmission member 39 will also rotate in the anti-clockwise direction under the action of its own return spring, as indicated by arrow E ', which causes the second cable to move back rapidly along arrow D'. Rotation of the transmission 39 further causes the indicator to pivot in the corresponding direction, allowing the circuit breaker mechanism to close in the stored energy state.

Next, with reference to fig. 12a and 12b, a description will be given of a transmission process when the ground operation hole shutter is rotated from the closed position to the open position in the opening state of the circuit breaker mechanism.

In the opening state of the circuit breaker mechanism, the ground operation hole shutter 12 is rotated in the clockwise direction as shown by an arrow a in the drawing. As described above, the ground operation hole blocking cover 12 is connected to the driving member 37 by the connecting member 374, and a support member 372 is provided below the driving member 37, so that the rotation of the ground operation hole blocking cover causes the driving member 37 to move leftward as indicated by arrow B, and since the second end of the rotating member is received in the long kidney hole 371 of the driving member via the pin, when the right end of the long kidney hole abuts against the second end of the rotating member, the leftward movement of the driving member causes the driving member to rotate in the counterclockwise direction as indicated by arrow C, and simultaneously pulls the elastic member 36 to extend and store energy. Due to the flexible property of the first inhaul cable, the first inhaul cable can deform and cannot be pushed upwards, and then the isolation operation hole blocking cover is pushed to rotate. Then, the second cable 38 is pulled by the rotating member 35 to move in the arrow D, which causes the transmission member 39 to rotate in the clockwise direction as shown by the arrow E. Furthermore, the indicator 21 pivots and ensures, through other transmission mechanisms inside the circuit breaker mechanism, that the circuit breaker mechanism cannot be closed in the stored energy state.

Next, referring to fig. 13a and 13b, a description will be given of a driving process when the ground operation hole shutter is rotated from the open position to the closed position in the opening state of the breaker mechanism.

In the opening state of the circuit breaker mechanism, in the case where the force for rotating the ground operation hole stopper cover in the clockwise direction is removed and the operation handle is not inserted into the ground operation hole, the ground operation hole stopper cover is rotated in the counterclockwise direction by its own return spring, as shown by an arrow a' in the drawing. At the same time, the rotary member is moved in the clockwise direction by the restoring force of the elastic member 36, as indicated by the arrow C'. In the process, the second end 352 of the rotary member 35 moves to the right in the long kidney hole 371 of the driving member 37 via the pin 353, and moves the driving member to the right as indicated by an arrow B'. At the same time, the transmission member 39 will also rotate in the anti-clockwise direction under the action of its own return spring, as indicated by arrow E ', which causes the second cable to move back rapidly along arrow D'. Rotation of the transmission 39 further causes the indicator to pivot in the corresponding direction, allowing the circuit breaker mechanism to close in the stored energy state.

In a state where the breaker mechanism is closed, as shown in fig. 14a and 14b, the stopper 22 of the breaker mechanism blocks the rotary piece 35 so that the rotary piece cannot rotate (indicated by "x"), the first cable cannot be pulled, the driving piece cannot move, and neither the isolating operation hole blocking cover nor the ground operation hole blocking cover cannot move from the closed position to the open position.

Fig. 15 shows the perspective view of the ring main unit according to the utility model discloses a, wherein, three station mechanism 1 show to keep apart three station mechanisms down, and circuit breaker mechanism 2 shows to be the separating brake state. The interlock described above can also be used for the coupling between the lower isolating three-position mechanism and the circuit breaker mechanism, with the only difference that the drive 37 is not required, which is determined by the characteristics of the lower isolating three-position mechanism, i.e. without the need to pivot the indicator of the circuit breaker mechanism in the case of the lower isolating three-position mechanism. Of course, a third cable (not shown) may be connected to the ground operating hole shutter and the rotary member, and the indicator of the circuit breaker mechanism is pivoted using a similar transmission process when the ground operating hole shutter is moved from the closed position to the open position. Under the condition of isolating the three-station mechanism from the lower part, under the opening state of the circuit breaker mechanism, the isolation operation hole blocking cover and the grounding operation hole blocking cover move from the closing position to the opening position similarly to the condition of isolating the three-station mechanism from the upper part, and the details are not repeated.

The utility model discloses an above has described the utility model discloses an interlock that is used for going up to keep apart three station mechanisms or keeps apart three station mechanisms and circuit breaker mechanism down, this interlock can be used to keep apart three station mechanisms and circuit breaker mechanism and keep apart between three station mechanisms and the circuit breaker mechanism down in the last of the looped netowrk cabinet of same series, and need not change interlock, the cost is reduced, and convenient assembling.

Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention to achieve the aim of the invention.

Claims (13)

1. An interlock between a three-position mechanism and a circuit breaker mechanism, the three-position mechanism including an isolation operation mechanism and a ground operation mechanism, the isolation operation mechanism including an isolation operation hole blocking cover rotatable between a closed position and an open position, the isolation operation hole blocking cover blocking the isolation operation hole in the closed position to prevent an operation handle from being inserted into the isolation operation hole, the isolation operation hole blocking cover exposing the isolation operation hole in the open position, the operation handle insertable into the isolation operation hole, the interlock comprising:

a first cable, one end of which is connected to the isolation operation hole blocking cover, and the first cable is pulled when the isolation operation hole blocking cover is rotated in a first direction from a closed position to an open position when the circuit breaker mechanism is in a brake-off state;

a rotating member pivotably installed in the circuit breaker mechanism, the other end of the first cable being connected to a first end of the rotating member, the rotating member rotating in a second direction opposite to the first direction when the first cable is pulled by the isolation operation hole blocking cover;

a second cable having one end connected to the rotating member and pulled when the rotating member rotates in a second direction;

the driving medium is connected to the other end of second cable, and when the second cable received the pulling of rotating member, the driving medium was rotatory along first direction, can be connected with an indicator at rotatory in-process, but indicator pivot ground is installed in circuit breaker mechanism for the rotation of driving medium drives indicator pivot, can not close a floodgate when protection circuit breaker mechanism energy storage state.

2. The interlock of claim 1 further comprising a support plate mounted within the circuit breaker mechanism, the rotary member being pivotally mounted to the support plate.

3. The interlock of claim 2 further comprising an elastic member having one end connected to the second end of the rotating member and the other end connected to the support plate, wherein the elastic member is stretched when the rotating member rotates in the second direction, and when the application of the rotational force to the isolating operation aperture stop cover is stopped, the elastic member rotates the rotating member in the first direction by a restoring force, thereby restoring the first cable.

4. The interlock of claim 1 wherein the circuit breaker mechanism includes a stop fixedly coupled to a main shaft of the circuit breaker mechanism, the stop not being positioned in a rotational path of the rotary member when the circuit breaker mechanism is in the open state, the stop being positioned in the rotational path of the rotary member to block rotation of the rotary member in the second direction to prevent rotation of the isolating access aperture cover from the closed position to the open position when the circuit breaker mechanism is in the closed state.

5. The interlock of claim 1 wherein the first cable is connected to the isolating operator aperture cover via a ring, the interlock further comprising a stop disposed on the isolating operator mechanism, the stop having a radius along which the isolating operator aperture cover pulls the ring of the first cable as the isolating operator aperture cover rotates from the closed position to the open position.

6. The interlock of claim 5 wherein the flapper further comprises an arcuate guide portion that guides the first cable when the first cable is pulled.

7. The interlock of claim 1 further comprising a drive member having an oblong aperture in which the second end of the rotary member is received via the pin such that rotation of the rotary member in the second direction translates the second end of the rotary member within the oblong aperture without causing movement of the drive member.

8. The interlock apparatus of claim 7, wherein the ground operating mechanism further comprises a ground operating hole blocking cover rotatable between a closed position in which the ground operating hole blocking cover blocks the ground operating hole to prevent the operating handle from being inserted into the ground operating hole and an open position in which the ground operating hole blocking cover exposes the ground operating hole and the operating handle can be inserted into the ground operating hole, the ground operating hole blocking cover being connected to the driving member via a connecting member, and the driving member being pulled to move and rotate the rotary member in the second direction via the second end of the rotary member when the ground operating hole blocking cover is rotated in the second direction from the closed position to the open position in the opening state of the circuit breaker mechanism.

9. An interlock as claimed in claim 8 wherein a support member is provided below the drive member to support the drive member and prevent tilting of the drive member during movement.

10. An interlock as claimed in any one of claims 1 to 9 wherein the three position mechanism is for an upper disconnecting circuit breaker mechanism.

11. The interlock device according to any one of claims 1 to 6, wherein the ground operating mechanism further includes a ground operating hole blocking cover rotatable between a closed position in which the ground operating hole blocking cover blocks the ground operating hole to prevent the operating handle from being inserted into the ground operating hole and an open position in which the ground operating hole blocking cover exposes the ground operating hole into which the operating handle can be inserted, the ground operating hole blocking cover being connected to the rotary member via a third cable, and when the ground operating hole blocking cover is rotated in the first direction from the closed position to the open position in the opening state of the circuit breaker mechanism, the third cable is pulled to rotate the rotary member to rotate the transmission member to thereby pivot the indicating member.

12. The interlock of claim 11 wherein said three position operating mechanism is used in a lower disconnect circuit breaker mechanism.

13. A ring main unit comprising a three-position mechanism, a circuit breaker mechanism and an interlock device according to any one of claims 1-12.

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