KR100351301B1 - Ground connection apparatus for circuit breaker - Google Patents

Abstract

The present invention relates to a ground connection device for a circuit breaker, comprising: a plurality of fixed ground contact members formed to be electrically connected to each load side of the circuit breaker; A rotation support shaft disposed along a spaced direction of the fixed ground contact member to enable a predetermined angle rotation; A plurality of movables integrally coupled to the pivot support shaft to be rotatable between a ground input position in contact with the fixed ground contact member and electrically connected to each other, and an open position spaced apart from the fixed ground contact member and electrically separated from each other; A ground contact member; A working arm rotatably coupled to the pivot support shaft; A ground injection spring member having one end coupled to the free end region of the working arm so as to be relatively movable, and the other end pivotably coupled to the inside of the circuit breaker to elastically press the working arm at the ground insertion position and the open position, respectively. Wow; A drive shaft having one end disposed inside the circuit breaker in parallel with the axial direction of the rotation support shaft and the other end disposed outside the circuit breaker; And a clutch means interposed between the rotation support shaft and the drive shaft to transmit the rotational force of any one of the drive shaft and the rotation support shaft to the other with a predetermined phase difference. Thereby, the ground connection device of the circuit breaker which can suppress the repulsion force between the ground contacts at the time of energizing an accident current, and can perform a ground input operation quickly and safely is provided.

Description

Ground connection device of circuit breaker {GROUND CONNECTION APPARATUS FOR CIRCUIT BREAKER}

The present invention relates to a ground connection device of a circuit breaker, and more particularly, a ground connection of a circuit breaker that can suppress the repulsive force between the ground contacts when energizing an accident current, and can perform a ground input operation quickly and safely. Relates to a device.

Electricity generated at a voltage of about 20,000V at the power plant is boosted to super high voltage suitable for power transmission, and is transferred to the primary substation. At the primary substation, the power supplied is lowered to 22.9 ㎸ and supplied to the secondary substation or each customer. . The power supplied to the primary substation is supplied to the power receiving facilities of each customer through a distribution system composed of overhead distribution lines and underground distribution lines, and is supplied to low voltage consumers through special high customers, high pressure consumers, and various outdoor transformers.

On the other hand, for the purpose of track division, branch, and the transformer primary winding protection to the underground distribution line, and a so-called ring main unit that the circuit breaker is being used for (RING MAIN UNIT), the ring main to the insulating material the current sulfur hexafluoride (SF ₆₎ Units are widely used.

1 is a schematic perspective view of a ground connection device area of a conventional circuit breaker. As shown, the conventional ground connection device of the circuit breaker, a plurality of fixed ground contact member 121 is installed in the lower region of the cradle 113, the vacuum circuit breaker (VACUUM INTERRUPTER) is installed, the fixed ground contact member Rotating support shaft 123 which is disposed along the spaced direction of 121 to be rotatably supported, and rotatably coupled integrally with the rotatable support shaft 123 to contact the fixed ground contact member 121 to be electrically connected to each other. A ground input position to be connected, a plurality of movable ground contact members 125 separated from the fixed ground contact member 121 and electrically separated from each other, and disposed at right angles to the pivot support shaft 123, and one end of which is accessible from the outside. The drive shaft 127 is disposed so as to be possible, the driven gear 131, one end of which is rotatably coupled to one end of the rotation support shaft 123, and the drive shaft to be engaged with the driven gear 131 to rotate 127) one time at a time Which can be coupled has a driving gear 133.

The mounting plate 115 is fixedly coupled to the rear lower region of the cradle 113, and a plurality of insulators 117 are provided in the lower region of the mounting plate 115 to protrude from the plate surface. A fixed ground contact member 121 is protruded and coupled to the end region of the insulator 117 so as to be electrically connected to each load side of the vacuum circuit breaker, and a rotation support shaft 123 is disposed on the upper side of the fixed ground contact member 121. It is rotatably supported.

The movable support contact member 125 extends in the radial direction and is coupled to the rotation support shaft 123 so as to be spaced apart from each other in the axial direction to correspond to the fixed ground contact member 121, and one side of the rotation support shaft 123. Bevel gear type driven gear 131 is rotatably coupled to the end.

The driven gear 131 is engaged with the driving gear 133 integrally rotatably coupled to the end of the driving shaft 127 disposed at a right angle with respect to the rotation support shaft 123 so as to rotate integrally with each other.

By such a configuration, when the operator rotates the driving shaft 127 by operating the manipulation handle (not shown), the rotational force of the driving shaft 127 is transmitted to the rotation support shaft 123 through the driving gear 133 and the driven gear 131. do. Accordingly, the rotation support shaft 123 is rotated between the input position where the fixed ground contact member 121 and the movable ground contact member 125 are in contact with each other and the open positions separated from each other according to the operator's selection.

On the other hand, in the input state in which the fixed ground contact member 121 and the movable ground contact member 125 are in contact with each other and electrically connected to each other, when the accident current is energized, the fixed ground contact member 121 and the movable ground contact member 125 ), So-called electron repelling force is generated, which repulses in the direction of mutual separation.

By the way, in the conventional ground connection device of the circuit breaker, the rotation support shaft 123 for rotatably supporting the movable ground contact member 125 and the rotational force generated by the operator's operation are supported by the rotation support shaft 123. Since the drive shaft 127 to be transmitted to the drive shaft 127 is simply engaged by the drive gear 133 and the driven gear 131 and is transmitted, there is a problem in that the electromagnetic repulsive force due to the conduction current cannot be suppressed during grounding.

In addition, since the rotational force from the drive shaft 127 is transmitted to the rotation support shaft 123 through the pair of interlocked drive gear 133 and the driven gear 131, since the feeding speed is relatively slow, the ground input There is a problem that the operation can not be performed in a timely manner.

Accordingly, it is an object of the present invention to provide a grounding connection device for a circuit breaker that can suppress the repulsive force between ground contacts when energizing an accidental current and can perform the grounding input operation quickly and safely.

1 is a schematic perspective view of a ground connection device region of a conventional circuit breaker;

2 is a front view showing an installation state of a ground connection device of a circuit breaker according to an embodiment of the present invention;

3 is a side view of the ground connection device of the circuit breaker of FIG.

4A and 4B are rear views of the ground input position and the open position of the ground connection device of the circuit breaker of FIG. 2, respectively.

5 is an enlarged perspective view of the movable ground contact member region of FIG. 2;

6 and 7 are an enlarged perspective view and a front view of the transmission member of Fig. 5, respectively;

8 and 9 are enlarged perspective views and front views of the driven clutch member of Fig. 5, respectively;

10 is an enlarged cross-sectional view taken along the line A-A of FIG.

11 is an enlarged view illustrating main parts of FIG. 3;

12 and 13 are an enlarged perspective view and a front view of the fixed guide member of FIG.

14 to 17 are views showing an operating state of the ground connection device of the circuit breaker of FIG.

18 is an exploded perspective view of a contact area between a drive shaft and a rotation support shaft according to another embodiment of the present invention;

19 is an exploded perspective view of the contact area between the drive shaft and the rotation support shaft according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

3: enclosure 5: vacuum circuit breaker

11: fixed ground contact member 13: pivot support shaft

15: movable ground contact member 19: locking jaw

23: ground insertion spring member 24: the first spring guide

25: drive shaft 26: second spring guide

33: transmission member 34, 53: teeth

36,42: chuck 41: driven clutch member

51 driving member 51 shaft support

67: fixed guide member 68a, 68b: depression

71: stopper member 73: spring member

75: adjusting bolt

The object is, according to the present invention, a plurality of fixed ground contact member is formed to be electrically connected to each of the load side of the circuit breaker; A rotation support shaft disposed along a spaced direction of the fixed ground contact member and capable of a predetermined angle rotation; A ground input position spaced apart from each other along the axial direction of the pivot support shaft and electrically connected to the fixed ground contact member, and an open position spaced apart from the fixed ground contact member to be electrically separated from each other; A plurality of movable ground contact members integrally coupled to the pivot support shaft; A working arm rotatably coupled to the pivot support shaft; A ground injection spring member having one end coupled to the free end region of the working arm so as to be relatively movable, and the other end pivotably coupled to the inside of the circuit breaker to elastically press the working arm at the ground insertion position and the open position, respectively. Wow; A drive shaft rotatably disposed outside of the circuit breaker so that one end thereof is disposed inside the circuit breaker in parallel with the axial direction of the rotation support shaft and the other end thereof is accessible to the outside; It is achieved by the ground connection device of the circuit breaker interposed between the rotation support shaft and the drive shaft to transfer the rotational force of any one of the drive shaft and the rotation support shaft with a predetermined phase difference to the other. do.

Here, the clutch means, a driven clutch portion which is rotatably disposed at one end of the rotation support shaft and integrally formed with the rotation support shaft and protruding from the plate surface on the side edge, and the driven shaft of the drive shaft It is coupled so as to be integrally rotatable to the clutch part side end, and is spaced apart by a predetermined angle difference along the circumferential direction on the side and rotated by a predetermined angle so as to be engaged with the bite jaw of the driven clutch part so as to rotate any one of the drive shaft and the rotation support shaft. It is preferable to include a drive clutch portion to be transmitted with a predetermined phase difference to the other.

And, it is effective to further include a fixing holding means for holding the drive shaft fixed to any one of the ground input position and the open position so that the drive shaft is not rotated inadvertently.

The fixing holding means has a depression formed in the circumferential surface corresponding to the ground input position and the open position, the position fixing guide member is rotatably coupled to the drive shaft and the radius of the position fixing guide member It is preferable to include a stopper member disposed to be movable along the direction and elastically contacting the recessed portion of the positioning guide member to prevent the positioning guide member from inadvertently rotating.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

2 is a front view illustrating an installation state of the ground connection device of the circuit breaker according to the exemplary embodiment of the present invention, FIG. 3 is a side view of the ground connection device of the circuit breaker of FIG. 2, and FIGS. 4A and 4B are respectively shown in FIG. Fig. 2 is a rear view of the ground connection device in the open position and the ground input position of the circuit breaker. As shown in these figures, a bush 6 on each side of the load side is disposed along the transverse direction on the front surface of the enclosure 3 of the circuit breaker, and inside the enclosure 3 each of the inlet side phases 7 and the load side. A plurality of vacuum circuit breakers 5 interposed to connect the respective phases 8 of the plurality of phases 8 are provided to be spaced apart from each other along the front and rear directions. One side of these vacuum circuit breakers 5 is provided with a ground connection device 10 of a circuit breaker according to an embodiment of the present invention.

The ground connection device 10 of the circuit breaker includes a plurality of fixed ground contact members 11 provided to electrically connect each phase 8 on the load side of the circuit breaker and the vacuum circuit breaker 5, respectively, and an enclosure 3 The rotational support shaft 13 which is disposed in the front-rear direction and extends along the radial direction of the rotation support shaft 13 and along the axial direction of the rotation support shaft 13 to each fixed ground contact member 11. A plurality of movable ground contact members (15) rotatable between a ground input position contacting the fixed ground contact member (11) and an open position spaced apart from each fixed ground contact member (11) correspondingly spaced apart from each other; An actuating arm 17 extending along the radial direction of the support shaft 13 to rotate integrally with the pivot support shaft 13, one end pivotably coupled to the enclosure 3, and the other end actuating arm 17. Relatively coupled to the free end of the unit, the unit A ground input spring member 23 elastically pressurizing the arm 17, a drive shaft 25 having one end disposed at one side of the rotation support shaft 13 and the other end exposed to the outside of the enclosure 3, and a drive shaft A power transmission unit 31 interposed between the 25 and the rotation support shaft 13 to transmit the rotational force of any one of the drive shaft 25 and the rotation support shaft 13 to the other with a predetermined phase difference. It is composed.

An actuating arm 17 is coupled to the rear end region of the pivot support shaft 13, and a ground input spring member 23 is coupled to the free end region of the actuating arm 17 so as to be relatively movable. At one side of the working arm 17, a locking jaw 19 is formed in contact with the fixing bolt 21 formed at one side at the ground insertion position to suppress the rotation of the working arm 17.

The ground injection spring member 23 is formed of a compression coil spring, and both ends thereof are supported in a relative movement by the first spring guide 24 and the second spring guide 26 which are elastically coupled to each other. .

In the ground input spring member 23 according to the present embodiment, the rotation angle from the open position of the movable ground contact member 15 to the ground input position is 90 °, and the working arm 17 is centered on the pivot support shaft 13. It is installed to have the dead point (압축) that is compressed to the maximum at the point rotated by 15 °.

The power transmission part 31 has a toothed part 34 formed in a circumferential surface thereof, and a transmission member 33 and a transmission member 33 coupled to the front end of the rotation support shaft 13 so as to be freely rotatable. The driven clutch member 41 and the tooth of the transmission member 33 are coupled to one side of the rotatable support shaft 13 so as to be integrally rotatably engaged with the transmission member 33 at a predetermined phase difference with respect to the rotational direction. It has a drive member 51 which is rotatably coupled to the inner end of the drive shaft 25 with the teeth 53 formed over a predetermined length section on the circumferential surface so as to be tooth-coupled to the mold 34.

5 is an enlarged perspective view of the movable ground contact member region of FIG. 2. As shown, a plurality of movable ground contact members 15 extending in the radial direction and spaced apart from each other along the axial direction are rotatably coupled to the rotation support shaft 13, and each movable ground contact member 15, a pair of contact springs 16 are respectively coupled to the free end region so as to be in contact with the fixed ground contact member 11 with a predetermined contact pressure.

One end of the pivot support shaft 13 is coupled by a split pin 44 so that the driven clutch member 41 can rotate integrally with the pivot support shaft 13, and on one side of the driven clutch member 41, The transmission member 33 is coupled to be freely rotatable with respect to the support shaft 13. One side of the transmission member 33 is coupled to the stopper ring 46 to prevent the transmission member 33 from being separated along the axial direction.

6 and 7 are enlarged perspective and front views, respectively, of the transmission member of FIG. 5, FIGS. 8 and 9 are enlarged perspective views and front views of the driven clutch member of FIG. 5, respectively, and FIG. 10 is an enlarged view taken along line AA of FIG. 5. It is a cross section. As shown in these figures, a bearing hole 38 is formed in the central area of the transmission member 33 to accommodate the pivot support shaft 13, and the teeth are partially toothed over some length section. 34 is formed. One side edge of the transmission member 33 is formed with a chamfer 36 protruding from the side edge and extending a predetermined length along the circumferential direction having an arc shape.

In the central area of the driven clutch member 41, a bearing hole 48 is formed to accommodate the pivot support shaft 13, and the driven clutch member 41 is integrally formed with the pivot support shaft 13 on the circumferential surface thereof. The split pin coupling hole 49 is formed to be penetrated so that the split pin 44 that can rotate is accommodated therein. One side edge of the driven clutch member 41 protrudes from the side edge so as to be engaged at a predetermined angle difference with respect to the chucking jaw 36 of the transmission member 33 and the rotational direction, and extends a predetermined length section along the circumferential direction. A jaw 42 having a shape is formed.

In the present embodiment, the transmission member 33 and the driven clutch member 41 have a clearance angle α of 70 ° to each other so that the engagement jaw 36 of the transmission member 33 can be rotated relative to each other. The angle β between both ends with respect to the center is formed to have 140 °, and the angle γ between both ends with respect to the center of the engagement jaw 42 of the driven clutch member 41 has 150 °. Are formed respectively.

Here, the clearance angle (α) and the angle (β, γ) between the two ends with respect to the center of the respective jaws (36, 42) can be configured differently as needed, respectively, each tooth (34, 53) The size and length of can also be appropriately adjusted.

11 is an enlarged view illustrating main parts of FIG. 3, FIG. 12 is an enlarged perspective view of the fixing guide member of FIG. 11, and FIG. 13 is a front view of the fixing guide member of FIG. 12. As shown in these figures, the shaft support member 61 is coupled to the enclosure 3 so as to support the rotation of the drive shaft 25, and the drive member 51 is divided by an inner end of the drive shaft 25. 54) to be integrally rotatable.

Inside the shaft support member 61, the bush member 64 is coupled to rotatably support the drive shaft 25 with respect to the shaft support member 61, and one side of the bush member 64 has a bush member ( A stopper ring 65 is coupled to prevent the flow of 64 and at the same time prevent the drive shaft 25 from escaping outward of the enclosure 3.

In the exposed end region of the drive shaft 25 disposed outside the enclosure 3, a lever coupling portion 27 having a rectangular cross-sectional shape is formed so that an operating lever (not shown) can be engaged, and the lever coupling portion is arranged along the axial direction. On one side of the fixed guide member 67 is rotatably coupled to the drive shaft 25 and formed with recesses 68a and 68b recessed on the circumferential surface to correspond to the ground input position and the open position. Are combined.

In the central region of the fixed guide member 67, a bearing hole 69 is formed to receive and couple the drive shaft 25, and the axis of the drive shaft 25 is rotatable integrally with the drive shaft 25 along the radial direction. The stopper member 71 is coupled to be movable horizontally in the direction.

On one side of the stopper member 71, the stopper member 71 is elastically received in contact with the recesses 68a and 68b of the fixed guide member 67, so that the drive shaft 25 can be prevented from being unintentionally rotated. A spring member 73 for elastically compressing the member 71 is coupled, and an adjustment bolt 75 is disposed on the upper side of the spring member 73 so as to be stretchable in the vertical direction to adjust the elastic force of the spring member 73. Is combined.

14 to 17 are views illustrating an operating state of the ground connection device of the circuit breaker of FIG. 2, respectively. Here, (a) shows the fixed guide member (67) region, (b) shows the movable ground contact member (15) region, (c) shows the respective bite jaws (36, 42) region, and (d) Areas of the ground injection spring member 23 are respectively indicated. As shown in these figures, the drive shaft 25 is pressed by the spring member 73 to the depression 68b of the fixed guide member 67, as shown in Fig. 14A in the open position. The stopper member 71 is fixed to be prevented from being accidentally rotated by elastic contact.

When the operation lever (not shown) is coupled to the lever coupling portion 27 of the drive shaft 25 and rotates in the clockwise direction of the drawing, the stopper member 71 is connected to the edge of the recess 68b of the fixed guide member 67. The driving member 51 which is brought into contact and moves upward and coupled to the inner end of the driving shaft 25 rotates in the clockwise direction, and the transmission member 33 rotates in the counterclockwise direction in engagement with the driving member 51. do.

At this time, the transmission member 33 is free to rotate about the rotation support shaft 13, the ground feed spring member 23, the rotation support shaft 13 and the movable ground contact member 15 are respectively shown in FIG. As shown in (d), it remains in the open position.

When the drive shaft 25 is rotated 70 ° clockwise from the open position, one end of the bite 36 of the transmission member 33 and the end of the bite 42 of the driven clutch member 41 mutually By contact, the rotational force of the drive shaft 25 is transmitted to the rotation support shaft 13 so that the movable ground contact member 15 rotates integrally with the rotation support shaft 13. At the same time, the working arm 17 starts to rotate integrally with the pivot support shaft 13, whereby the ground injection spring member 23 is gradually compressed to accumulate elastic force.

When the drive shaft 25 is rotated 85 ° from the open position, the pivot support shaft 13 and the movable ground contact member 15 rotate 15 ° from the open position, as shown in FIG. The input spring member 23 is located at the dead point which is compressed to the maximum.

When the drive shaft 25 is continuously rotated, the working arm 17 is quickly rotated to the ground insertion position by the elastic force of the ground insertion spring member 23 passing through the dead point, thereby causing the rotation support shaft 13 and Each movable ground contact member 15, which is integrally rotatable, is quickly rotated to the ground input position and brought into contact with the fixed ground contact member 11.

At this time, the rotational force of the rotation support shaft 13 is driven by the other end of the engagement jaw 42 of the driven clutch member 41 is in contact with the other end of the transmission member 33, the driving member ( By being transmitted to 51, the drive shaft 25 is quickly rotated to the ground input position.

Here, the drive shaft 25 is rotated at a relatively high speed only 5 ° even if the ground injection spring member 23 is rotated quickly, so that the operator is not applied to the force is secured to ensure the safety of the operator. When the rotation of the drive shaft 25 is completed, the stopper member 71 is accommodated in the depression 68a of the fixed guide member 67 and the spring member 73 is extended to press the stopper member 71 to press the drive shaft ( 25) can be prevented from being accidentally rotated.

On the other hand, when switching from the ground input position to the open position, the operation lever is coupled to the lever engaging portion 27 of the drive shaft 25, and rotated counterclockwise in the figure. At this time, the engagement jaw 36 of the transmission member 33 and the engagement jaw 42 of the driven clutch member 41 which are engaged with the driving member 51 coupled to the drive shaft 25 are in contact with each other, The rotational force of the drive shaft 25 is transmitted to the rotation support shaft 13 through the drive member 51, the transmission member 33, and the driven clutch member 41, so that the rotation support shaft 13 rotates together with the drive shaft 25. Done.

Accordingly, the movable ground contact member 15 coupled to rotate integrally with the rotation support shaft 13 is rotated by being separated from the fixed ground contact member 11 and rotated integrally with the rotation support shaft 13. By 17, the ground injection spring member 23 is gradually compressed to accumulate elastic force.

The ground feed spring member 23 is continuously compressed until the drive shaft 25 rotates 70 ° counterclockwise from the ground feed position, and is opened quickly by the accumulated elastic force when passing through the dead point of 70 °. To the position. When the rotation of the drive shaft 25 is completed, the stopper member 71 is accommodated in the recess 68a of the fixed guide member 67 and elastically contacted to prevent the drive shaft 25 from being unintentionally rotated.

18 is an exploded perspective view of a contact area between a drive shaft and a rotation support shaft according to another embodiment of the present invention. The same reference numerals are given to the same and equivalent parts as the above-described and illustrated embodiments, and detailed description thereof will be omitted. As shown, a drive shaft 25 is disposed on an extension line of the rotation support shaft 13 to which the movable ground contact member 15 is rotatably coupled integrally.

On the other hand, the end of the rotation support shaft 13 is coupled so that the driven clutch member 85 having a bite jaw 87 is formed on the side so as to be integrally rotatable, and the driven clutch member 85 at one end of the drive shaft 25. ) And a driving clutch member 81 having a claw 83 formed at a side thereof to be engaged with each other with a predetermined phase difference with respect to the rotation direction.

19 is an exploded perspective view of the contact area between the drive shaft and the rotation support shaft according to another embodiment of the present invention. The same reference numerals are given to the same and equivalent parts as the above-described and illustrated embodiments, and detailed description thereof will be omitted. As shown in the drawing, the inner end of the drive shaft 25 is coupled so as to be integrally rotatable a drive member 91 having a bite jaw 92 formed on one side thereof, and along the axial direction of the drive shaft 25. One side of the drive member 91 has a transmission member 93 having a chuck 95 formed therein so as to be engaged with the chuck 92 of the drive member 91 with a predetermined phase difference with respect to the rotational direction with respect to the drive shaft 25. It is coupled freely. A tooth portion 94 is formed over a predetermined length section on the circumferential surface of the transmission member 93.

On the other hand, the driven member 97 is formed at one end of the rotation support shaft 13, the tooth portion 98 is formed in the tooth portion 98 to be mutually coupled with the tooth portion 94 formed on the peripheral surface of the transmission member (93) Is rotatably coupled with the pivot support shaft 13.

As described above, according to the present invention, there is provided a working arm that is rotatably coupled to the rotational support shaft of the movable ground contact member, engaging the flexible grounding input spring member to the free end of the working arm, the movable ground By providing a mutually engaging clutch means with a predetermined phase difference with respect to the rotational direction between the drive shafts arranged in parallel with the rotational support shaft of the contact member, the repulsive force between the ground contacts is suppressed even when an accident current is energized. In addition, a ground connection device of a circuit breaker is provided which can perform a ground input operation quickly and safely.

Claims (4)

A plurality of fixed ground contact members formed to be electrically connected to each of the load side portions of the circuit breaker; A rotation support shaft disposed along a spaced direction of the fixed ground contact member and capable of a predetermined angle rotation; A ground input position spaced apart from each other along the axial direction of the pivot support shaft and electrically connected to the fixed ground contact member, and an open position spaced apart from the fixed ground contact member to be electrically separated from each other; A plurality of movable ground contact members integrally coupled to the pivot support shaft; A working arm rotatably coupled to the pivot support shaft; A ground injection spring member having one end coupled to the free end region of the working arm so as to be relatively movable, and the other end pivotably coupled to the inside of the circuit breaker to elastically press the working arm at the ground insertion position and the open position, respectively. Wow; A drive shaft rotatably disposed outside of the circuit breaker so that one end thereof is disposed inside the circuit breaker in parallel with the axial direction of the rotation support shaft and the other end thereof is accessible to the outside; And a clutch means interposed between the rotation support shaft and the drive shaft to transmit a rotational force of any one of the drive shaft and the rotation support shaft to the other with a predetermined phase difference. The method of claim 1, The clutch means includes: a driven clutch portion at one end of the pivot support shaft rotatably integrated with the pivot support shaft and formed with at least one bite jaw protruding from the plate surface at the side edge; and the driven clutch portion side of the drive shaft. It is coupled to the end integrally rotatable and is spaced apart by a predetermined angle difference along the circumferential direction on the side and rotated by a predetermined angle to be engaged with the engagement jaw of the driven clutch portion to the other one of the drive shaft and the rotation support shaft And a driving clutch part configured to be transmitted at a predetermined phase difference in the ground connection device of the circuit breaker. The method according to claim 1 or 2, And a fixing holding means for holding the driving shaft fixed at any one of the ground input position and the open position so that the driving shaft is not rotated inadvertently. The method of claim 3, The fixing holding means has a depression formed in the circumferential surface corresponding to the ground input position and the open position, the position fixing guide member is rotatably coupled to the drive shaft and the radius of the position fixing guide member And a stopper member disposed to be movable along the direction and elastically contacting the recessed portion of the position fixing guide member to prevent the position fixing guide member from inadvertently rotating. .