KR101604281B1 - Carriage for earth for circuit breaker - Google Patents

Abstract

The present invention relates to a grounding bogie of a circuit breaker, comprising: a ground bogie main body having a load terminal connection portion connected to a load terminal of a breaker chamber and a ground bus bar connected to the load terminal connection portion; A carriage having a wheel for movement and a ground pin connected to the ground bus bar and disposed below the ground bogie main body to move the ground bogie main body; A girder disposed on a front surface of the carriage; A lead screw rotatably connected to the girder at one end and rotatably connected to the carriage at the other end; A feed nut provided on the carriage and screwed to the lead screw; A feed nut control unit for restraining and releasing the feed nut; And an interlock device connected to the bus line power source and for releasing the feed nut control unit when the bus line power is applied, thereby suppressing the input of the ground line body. As a result, it is possible to suppress the occurrence of safety accidents due to the application of the bus line power by suppressing the entry of the breaker chamber during the application of the bus line power.

Description

{CARRIAGE FOR EARTH FOR CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding bogie of a circuit breaker, and more particularly, to a grounding bogie of a circuit breaker capable of suppressing the input of a ground bogie during power supply of a bus.

As is well known, a circuit breaker is an electric protective device installed between a power source and a load device so as to protect a load device and a line from an accident current (a large current due to a short circuit, a ground fault, etc.)

In general, the grounding braking circuit of the circuit breaker is a grounding device which can prevent a safety accident caused by the charging current by the operator during repair or inspection of the load side equipment by grounding and removing the charging current remaining on the load side of the switchboard .

Fig. 1 is a side view of a ground bogie of a conventional circuit breaker, and Fig. 2 is a front view of the ground bogie of Fig. 1. Fig. As shown in these drawings, the grounding bogie of the circuit breaker includes a grounding bogie main body 30 connected to the load terminal 11 of the breaker chamber 10, (40).

The breaker chamber 10 is provided with a load terminal 11 connected to the load device (circuit) and a bus terminal 15 connected to the bus bar.

As is well known, although not shown in the drawing, in the cutoff chamber 10, there are provided a load terminal connection portion connected to the load terminal 11, a bus terminal connection portion connected to the bus terminal 15, And a vacuum interrupter having a vacuum interrupter provided between the terminal connection portions. Thereby, the power of the bus bar supplied to the load device (circuit) can be safely opened and closed.

The grounding bogie body 30 is provided with a load terminal connection portion 31 connected to the load terminal 11 of the cutoff chamber 10.

The ground bus bar body 30 is provided with a ground bus bar 35 connected to the load terminal connection portion 31.

The carriage 40 is provided with a plurality of wheels 42 so that the carriage 40 can be easily moved.

A ground shoe 47 connected to the ground bus bar 35 is provided at a lower portion of the carriage 40.

The ground shoe 47 is in electrical contact with the ground plate 48 connected to the ground.

A lever 45 for movement is provided in the rear portion of the ground bogie body 30 or the carriage 40.

However, in the conventional ground circuit of the circuit breaker, when the grounding lane is drawn into the interrupter chamber 10 for connection with the load terminal 11 during the application of the bus line power, a safety accident caused by the current of the bus line There is a risk of occurrence.

KR 10-0396705 B1

Therefore, it is an object of the present invention to provide a grounding bogie of a circuit breaker capable of suppressing a pull-in during a bus power supply.

Another object of the present invention is to provide a grounding bogie capable of suppressing the movement of a ground bogie during application of bus power.

In order to achieve the above object, according to the present invention, there is provided a grounding bogie main body having a load terminal connecting portion connected to a load terminal of a breaking chamber and a grounding bus bar connected to the load terminal connecting portion; A carriage having a wheel for movement and a ground pin connected to the ground bus bar and disposed below the ground bogie main body to move the ground bogie main body; A girder disposed on a front surface of the carriage; A lead screw rotatably connected to the girder at one end and rotatably connected to the carriage at the other end; A feed nut provided on the carriage and screwed to the lead screw; A feed nut control unit for restraining and releasing the feed nut; And an interlock device for preventing the feeding nut control unit from releasing the restraint of the feeding nut during power application of the busbusters, thereby suppressing the input of the ground bogie body.

The feed nut control unit includes a feed pin for restricting the feeding nut when the lead screw is rotated in the feeding direction, and for feeding the carriage. The interlock device further includes a feeding pin, And a solenoid operable to release the restraint of the transfer nut.

Wherein the interlock device includes a first cam profile having a restraint position where the pull pin restrains the feed nut and a release position where the pull pin releases the restraint of the feed nut, ; ≪ / RTI >

The inlet pin may include a roller that contacts the cam plate.

Wherein the first cam profile includes a first horizontal section in which the inlet pin is positioned in the restraining position, a second horizontal section in which the inlet pin is positioned in the release position, and a second horizontal section in which the inlet pin is positioned in the release position, And a connection section for slantingly connecting the connection section.

The interlock device may further include a guide unit provided on the carriage and the cam plate to guide movement of the cam plate.

Wherein the guide unit comprises: a guide pin formed on one of the carriage and the cam plate; And a guide slot formed on the other of the carriage and the cam plate.

Wherein the feed nut control unit includes a take-out pin for restricting the feed nut when the lead screw is rotated in the pull-out direction, so that the carriage is pulled out, and the cam plate has a restricting position where the pull- And a second cam profile file having a release position for releasing the constraint of the feeding nut by the drawing pin.

The drawing pin may include a roller that is in contact with the cam plate.

Wherein the second cam profile includes a first section in which the drawing pin is formed along the moving direction of the drawing pin so as to be movable between the holding position and the releasing position and a second section in which the drawing pin is held in the releasing position, And a second section formed perpendicularly to the section.

The interlock device may further comprise a return spring for returning the cam plate to an initial position.

As described above, according to the embodiment of the present invention, since the feed nut control unit during the bus-line power application is provided with the interlock device for restricting the feeding nut to restrain the feeding of the ground bogie body, The entry of the breaking chamber of the grounding bogie during power application can be suppressed.

In addition, since the feed nut control unit has the lead-in pin and the lead-out pin, and the cam plate includes the first cam profile file and the second camp profile file, all of the movements .

Further, since the interlock device is provided in the carriage and the cam plate and includes the guide unit for guiding the movement of the cam plate, the movement of the cam plate can be smooth.

Further, by providing rollers in contact with the cam plate on the lead-in pin and lead-out pin, the movement of the cam plate can be made more smooth.

1 is a side view of a grounding bogie of a conventional circuit breaker,
Figure 2 is a front view of the ground bogie of Figure 1,
3 is a view showing a state of use of a ground bogie of a circuit breaker according to an embodiment of the present invention,
Figure 4 shows the interior of the ground bogie of Figure 3,
Figure 5 is a front view of the ground bogie of Figure 3,
Fig. 6 is a bottom view of the grounding bogie of Fig. 3,
Figure 7 is a perspective view of the carriage of Figure 3,
FIG. 8 is a plan view showing the inside of the carriage of FIG. 3,
Fig. 9 is an enlarged view of the main part of Fig. 8,
FIG. 10 is a perspective view of a state in which the lead-in pin and the lead-out pin of FIG.
Fig. 11 is a perspective view of the conveying nut of Fig. 8,
Fig. 12 is a sectional view of the solenoid of Fig. 8,
Fig. 13 is a plan view of the cam plate of Fig. 8,
FIG. 14 is a view showing a power connection state of the interlock device of the ground bogie of FIG. 3,
Figure 15 is a control block diagram of the ground bogie of Figure 3,
16 is a view for explaining the operation of the interlock device of Fig.

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

3 to 5, the ground braking circuit of the circuit breaker according to the embodiment of the present invention includes a load terminal connection part 131 connected to the load terminal 111 of the cutoff chamber 110, A ground bogie main body 130 having a ground bus bar 135 connected to the connection part 131; And a grounding pin 145 connected to the grounding bus bar 135. The grounding bus bar 135 is disposed below the grounding bogie main body 130 and is adapted to move the ground bogie main body 130. [ (140); A girder 150 disposed on a front surface of the carriage 140; A lead screw 160 rotatably connected to the girder 150 at one end and rotatably connected to the carriage 140 at the other end; A transfer nut 170 provided on the carriage 140 and screwed to the lead screw 160; A feed nut control unit 180 for restraining and releasing the feed nut 170; And an interlock device 210 for releasing the restraint of the feed nut 170 while the feed nut control unit 180 during the power application of the busbusters suppresses the input of the ground bogie body 130 have.

The breaker chamber 110 may be provided with a load terminal 111 and a bus terminal 115, respectively.

The load terminal 111 and the bus terminal 115 may be provided in a plurality (for example, three) of power sources (for example, R phase, S phase, and T phase).

The bus terminal 115 may be provided at a lower portion of the cutoff chamber 110, for example.

The load terminals 111 may be provided on the bus terminal 115, respectively.

The ground bogie main body 130 may include a load terminal connection portion 131 that contacts the load terminal 111 of the cutoff chamber 110, for example.

The load terminal connection portions 131 may be formed of three spaced apart in the horizontal direction.

A carriage 140 may be provided on the lower side of the ground bogie body 130.

The carriage 140 may include a plurality of wheels 142. As a result, the ground truck main body 130 can be smoothly moved

The wheels 142 may be spaced apart from each other on both sides of the carriage 140, for example.

A ground bus bar 135 may be provided inside the ground bogie body 130.

One end (upper end) of the ground bus bar 135 may be electrically connected to the load terminal connection part 131.

The other end (lower end) of the ground bus bar 135 may be connected to a ground pin 145 provided in the carriage 140, for example, as shown in FIG.

The ground pin 145 may be connected to the ground. Accordingly, the charge current of the load device connected to the load terminal 111 is lower than the charge current of the load terminal 111, the load terminal connection 131, the ground bus bar 135 and the ground pin 145) to the ground.

7 and 8, a girder 150 may be provided on the front side of the carriage 140. As shown in FIG.

The girder 150 may have a fixing piece 152 so as to be fixed to the blocking chamber 110. The carriage 140 is relatively moved with respect to the lead screw 160 rotatably supported by the girder 150 so that the ground truck main body 130 is moved to the rear of the cutoff chamber 110 .

The fixing piece 152 may be provided at both ends of the girder 150

The fixing piece 152 may be configured to protrude and retract from both ends of the girder 150.

A grip 154 may be provided on the front surface of the girder 150.

The knobs 154 may be formed as a pair, for example.

The carriage 140 and the girder 150 may be provided with a lead screw 160.

One end (for example, the rear end) of the lead screw 160 can be rotatably supported by the carriage 140.

The other end (for example, the front end) of the lead screw 160 may be rotatably supported by the girder 150.

The handle 150 may be provided with a handle coupling hole 156 through which a rotary handle 157 for rotating the lead screw 160 may be inserted.

A feed nut 170 may be screwed to the male screw portion 162 of the lead screw 160.

The feeding nut 170 may be provided in the carriage 140. Accordingly, the carriage 140 can be moved by the movement of the feed nut 170 when the lead screw 160 rotates.

A conveying nut control unit 180 for restraining and releasing the conveying nut 170 may be provided around the conveying nut 170.

8 and 9, the feed nut control unit 180 restricts the feed nut 170 when the lead screw 160 rotates in the pull-in direction, so that the carriage 140 And may be provided with an inlet pin 191 to be inserted.

The inlet pin 191 may be disposed at the front end of the feed nut 170, for example.

And an inlet drive pin 193 for driving the inlet pin 191 may be provided on one side of the inlet pin 191.

The inlet driving pin 193 may have a length longer than the inlet pin 191.

The lead-in drive pin 193 may be arranged in parallel to one side of the lead-in pin 191.

The lead-in drive pin 193 may be provided with a lead-in spring 196 for applying an elastic force to the lead-in pin 191 in a direction of restricting the lead-in nut 170.

The inlet pin 191 and the inlet drive pin 193 may be integrally connected by a connecting member 195.

The connecting member 195 may be coupled to the end of the lead-in pin 191 and the lead-in drive pin 193 at the same time.

The feed nut control unit 180 may include a feed pin 201 for restricting the feed nut 170 when the lead screw 160 rotates in the feed direction to draw the carriage 140 have.

The drawing pin 201 may be provided at the rear end of the conveying nut 170, for example.

A drawing-out driving pin 203 may be provided on one side of the drawing-out pin 201.

The pull-out driving pin 203 may have a longer length than the pull-out pin 201.

The drawing pin 201 and the drawing driving pin 203 may be integrally connected by a connecting member.

The take-out drive pin 203 may be provided with a take-off spring 206 for applying an elastic force to the take-out pin 201 in a direction for restricting the transfer nut 170.

The feed nut control unit 180 may include a frame 181 for supporting the feed pin 191 in a relatively movable manner.

The inlet pin 191 and the outlet pin 201 may be coupled to the frame 181 to be movable relative to each other.

One end of the lead-in drive pin 193 may protrude toward the rear side of the frame 181.

A roller 197 may be provided at an end of the lead-in driving pin 193. [

The roller 197 of the lead-in drive pin 193 may be rotatably disposed below the lead-in drive pin 193.

One end (e.g., the front end) of the drawing driving pin 203 may protrude toward the front side of the frame 181. [

The other end (for example, the rear end) of the drawing driving pin 203 may protrude toward the rear side of the frame 181.

The drawing driving pin 203 may have a longer length than the drawing driving pin 193.

A roller 207 may be provided at the rear end of the drawing drive pin 203.

The roller 207 of the drawing driving pin 203 may be rotatably disposed below the drawing driving pin 203.

The feed nut 170 may be received in the frame 181.

The feed nut 170 may include a female screw portion 177.

11, the feed nut 170 is provided with an inlet pin jaw 172 such that the inlet pin 191 and the outlet pin 201 can be engaged with the inlet and outlet directions, respectively, And a lead-out pin catching jaw 175 may be provided at both ends, respectively.

More specifically, one end (front end portion) of the conveying nut 170 may be provided with a lead-in pin 172 for preventing rotation in the lead-in direction by the lead-in pin 191. Accordingly, when the lead screw 160 rotates in the pull-in direction, rotation of the feed nut 170 in the pull-in direction is suppressed by the pull-in pin 172, thereby moving the carriage 140 in the pull- .

A lead pin guide surface 174 for guiding the lead pin 201 away from the end of the feed nut 170 when the lead screw 160 rotates in the pull-out direction is formed on one side of the lead- .

The other end (for example, the rear end portion) of the conveying nut 170 may be provided with a take-out pin engaging jaw 175 that is prevented from rotating in the take-out direction by the take-out pin 201. Accordingly, when the lead screw 160 is rotated in the pull-out direction, rotation of the feed nut 170 in the pull-out direction is suppressed by the pull-out pin engaging jaws 175 so that the carriage 140 is moved in the pull- .

A lead pin guide surface 176 for guiding the lead pin 201 away from the end of the feed nut 170 when the lead screw 160 rotates in the pulling direction is formed on one side of the lead pin holding tab 175 .

Each of the lead-in pin catching jaws 172 and the lead-out pin catching jaws 175 may be two.

Each of the inlet pin catching jaws 172 may be disposed opposite to the front end of the feed nut 170 at an interval of 180 degrees along the rotational direction.

Each of the take-out pin catching jaws 175 may be spaced apart from each other at an interval of 180 degrees along the rotational direction at the rear end of the conveying nut 170.

Meanwhile, an interlock device 210 may be provided around the feed nut 170 to prevent the feeding nut control unit 180 from being released during power application of the busbust, thereby restraining the insertion of the ground bogie body 130.

The interlock device 210 may include a solenoid 220 for operating the feed pin 191 to release the constraint of the feed nut 170 during application of the bus power.

12, the solenoid 220 includes a coil 222, a yoke 224 disposed around the coil 222 to form a magnetic path, a coil 222 A movable core 228 movably disposed inside the coil 222 and a return spring 231 for returning the movable core 228 to an initial position .

The coil 222 may have, for example, a cylindrical shape.

For example, a bobbin 223 may be provided inside the coil 222.

A rod 233 may be connected to the movable core 228.

One end of the rod 233 may be movably coupled to the center of the fixed core 226. Thereby, the behavior of the movable core 228 can be stabilized.

The outer end of the movable core 228 is protruded by the elastic force of the return spring 231 when the solenoid 220 is in the power supply stop state of the coil 222, The rod 233 is protruded at the time of power supply (energization) of the coil 222 to press the cam plate 250 to the release position, .

The interlock device 210 includes an interlock device 210 having a locking position where the inlet pin 191 restrains the transfer nut 170 and a release position where the inlet pin 191 releases the restraint of the transfer nut 170. [ And a cam plate 250 having a cam follower 251 and connected to the solenoid 220.

The cam plate 250 may be formed as a plate-like member, for example, as shown in Fig.

The cam plate 250 may be disposed to be movable transversely to the longitudinal direction of the lead screw 160.

The first cam profile 251 may be formed at one side edge (front edge) of the cam plate 250 to move the inlet pin 191 to the restraint position and the release position, respectively.

The first cam profile 251 may include a first horizontal section 252a in which the inlet pin 191 is positioned at the restraint position and a second horizontal section 252b in which the inlet pin 191 is positioned at the release position 2 horizontal section 252b and a connection section 252c connecting the first horizontal section 252a and the second horizontal section 252b in an inclined manner.

Here, the first horizontal section 252a, the connection section 252c, and the second horizontal section 252b may be configured to contact the roller 197 provided on the input driving pin 193.

The second horizontal section 252b may be implemented as a front side of the cam plate 250. [

The distance between the first horizontal section 252a and the second horizontal section 252b may correspond to a distance that the inlet pin 191 can be spaced from the inlet pin tab 172.

The cam plate 250 is provided at one side of the front edge thereof with a locking position where the release pin 201 restrains the transfer nut 170 and a release position where the release pin 201 releases the restraint of the transfer nut 170. [ A second camp guide 261 having a position can be formed.

The second camprofile 261 includes a first section 262a formed along the moving direction of the drawing pin 201 so that the drawing pin 201 is movable between the restraint position and the release position, And a second section 262b formed to be perpendicular to the first section 262a so that the drawing pin 201 is held at the releasing position.

The first section 262a may be formed along the moving direction of the drawing pin 201 and the second section 262b may be formed along the moving direction of the cam plate 250. [

A pressing portion 265 may be formed on one side of the cam plate 250 to be pressed against the solenoid 220.

The pressing portion 265 may be formed to protrude upward from the plate surface of the cam plate 250.

A cam plate return spring 268 for returning the cam plate 250 to an initial position may be provided on one side of the cam plate 250.

The cam plate return spring 268 may be configured to be extended or contracted along the moving direction of the cam plate 250, for example.

The cam plate return spring 268 may be embodied as a tension spring, for example.

The cam plate 250 may be provided at one side thereof with a cam plate return spring fixing portion 267 to which one end of the cam plate return spring 268 is fixed.

The interlock device 210 may include a guide unit 270 provided on the carriage 140 and the cam plate 250 to guide movement of the cam plate 250.

The guide unit 270 includes a guide pin 274 formed on one of the carriage 140 and the cam plate 250; And a guide slot 272 formed on the other one of the carriage 140 and the cam plate 250.

The guide pin 274 may be provided on the carriage 140, for example.

More specifically, for example, the guide pin 274 may be embodied as a bolt inserted into the guide slot 272 and screwed into the carriage 140.

The cam plate 250 may be formed with a guide slot 272 in which the guide pin 274 is relatively movably received.

The guide slot 272 may be formed as a slot having a long length along the relative movement trajectory of the guide pin 274.

The guide pin 274 and the guide slot 272 may be formed of a plurality of guide pins.

The solenoid 220 may include a cable 235 for applying an excitation power to the coil 222.

As shown in FIG. 14, the cable 235 may be electrically connected to a power connection unit 239 connected to an external power source. When the external power is supplied, the solenoid 220 is moved to the operating position to move the inlet pin 191 and the outlet pin 201 to the release position of the transfer nut 170, It is possible to suppress the draw-in and draw-out of

The power connection unit 239 may include a connection cable 237 to be connected to the cable 235 of the solenoid 220.

The ground braking circuit of the circuit breaker of the present embodiment may include a power supply control unit 280 for controlling the power supply of the solenoid 220.

15, for example, the solenoid 220 may be controllably connected to the power control unit 280.

The power supply control unit 280 may be connected to a bus power detection unit 285 for detecting whether or not the bus of the cutoff chamber 110 is connected to the power supply.

The connection cable 237 of the solenoid 220 can be connected to the connection terminal 231 of the interrupter chamber 110 via the connection cable 237. In this case, have.

The power supply control unit 280 may check whether the bus line power is applied from the bus line power detection unit 285 and control the power supply of the solenoid 220 to be turned off during the bus line power supply.

When the power of the solenoid 220 is cut off, the movable core 228 is returned to the initial position where the movable core 228 is separated from the fixed core 226 by the elastic force of the return spring 231, as shown in FIG. 16 .

When the movable core 228 returns to the initial position, the outer end of the movable core 228 presses the pressing portion 265 of the cam plate 250.

When the outer end of the movable core 228 presses the pressing portion 265 of the cam plate 250, the cam plate 250 can be moved to the release position. At this time, the guide unit 270 supports the cam plate 250 to guide the cam plate 250 to move smoothly from the restraint position to the release position.

As the cam plate 250 moves, the cam plate return spring 268 is able to accumulate the elastic force while being stretched.

When the cam plate 250 is moved from the restraint position to the release position, the roller 197 of the lead-in drive pin 193 and the roller 207 of the lead-out drive pin 203 are moved to the first cam- Can be moved relative to each other along the second camprofile (251) and the second camprofile (261).

More specifically, as the cam plate 250 moves, the roller 197 of the inlet driving pin 193 is pressed along the connection section 252c in the first horizontal section 252a, Can be moved. As a result, the retracting spring 196 compresses and accumulates elastic force, and the retention pin 191 can be moved away from the retention pin 172.

The roller 207 of the drawing driving pin 203 is in a state in which the carriage 140 is moved toward the girder 150 before the grounding bogie is inserted so that the drawing driving pin 203 is pressed to protrude rearward I.e., at the rear end of the first section 262a of the second campfire 261. [ That is, since the carriage 140 has already been drawn out, the drawing pin 201 is already in the unlocked position.

When the cam plate 250 is moved from the restricting position to the releasing position, the roller of the drawing driving pin 203 can be relatively moved into the second section 262b of the second cam profile 261.

If the power of the bus bar of the cutoff chamber 110 is shut off as a result of power detection of the bus bar of the cutoff chamber 110 by the bus power detection unit 285, the power control unit 280 controls the solenoid 220 To be supplied with power. Accordingly, the grounding bogie can be inserted into the cutoff chamber 110 only when the power supply of the bus bar of the cutoff chamber 110 is stopped, so that a safety accident due to power supply of the bus can be prevented in advance .

The coil 222 generates a magnetic force and the yoke 224, the fixed core 226 and the movable core 228 form a magnetic path when power is applied to the coil 222 of the solenoid 220 .

The movable core 228 is attracted to the fixed core 226 side by a magnetic force so that the return spring 231 can accumulate the elastic force while being compressed.

When the movable core 228 is moved toward the fixed core 226, the outer end of the movable core 228 may be moved away from the pressing portion 265.

At this time, the cam plate return spring 268 can move the cam plate 250 to the restraining position as shown in FIGS. 8 and 9 by the accumulated elastic force.

When the cam plate 250 is moved to the restraining position, the pulling pin 191 is moved to the restraining position by the elastic force of the pulling spring 196 as the pulling driving pin 193 moves to the restraining position . Accordingly, the inlet pin 191 is engaged with the inlet inlet pin 172 of the feed nut 170 in the direction of rotation of the inlet nut 170, thereby restricting the feed nut 170.

When the rotary handle 157 is inserted into the handle coupling hole 156 and the rotary handle 157 is rotated in the drawing direction (for example, clockwise direction in the drawing), the lead screw 160 is rotated in the drawing direction .

Since the feed nut 170 is constrained to the pulling direction by the pulling pin 191, the feedring nut 170 can be moved backward along the leadscrew 160. Accordingly, the carriage 140 and the grounding carriage body 130 can be relatively moved rearward of the cutoff chamber 110.

When the rotation handle 157 is continuously rotated in the pull-in direction, the load terminal connection portion 131 of the ground bogie body 130 can be coupled to the load terminal 111. Accordingly, the charge current charged in the load device can be removed by flowing to the ground through the load terminal 111, the load terminal connection portion 131, the ground bus bar 135, and the ground pin 145.

The end of the input driving pin 193 immediately before the completion of the engagement of the load terminal connection part 131 is brought into contact with a locking part (not shown) provided in the blocking chamber 110, The transfer nut 170 is separated from the lead pin 172 of the feed nut 170 so that the restraint of the feed nut 170 is released and the carriage 140 can be prevented from moving backward.

On the other hand, when the ground bogie is to be drawn out, the rotation handle 157 may be rotated in a pull-out direction (for example, counterclockwise) in a state of being engaged with the handle coupling hole 156.

When the rotation handle 157 is rotated in the pull-out direction, the feed nut 170 can be restricted from rotating in the pull-out direction by the pull-out pin 201. Accordingly, the feed nut 170 can be relatively moved forward along the lead screw 160. [

As the feed nut 170 moves, the carriage 140 and the grounding truck body 130 are moved forward of the cutoff chamber 110. The load terminal connection portion 131 is moved from the load terminal 111 Separated and spaced apart.

When the carriage 140 is moved forward, the front end of the drawing driving pin 203 may be in contact with the inner surface of the girder 150. As a result, the forward movement of the drawing drive pin 203 is stopped, and the drawing spring 206 is compressed to accumulate the elastic force. When the pull-out driving pin 203 is stopped, the pull-out pin 201 is stopped and the pull-out pin 201 can be separated from the pull-out pin hook 175 by the relative movement of the feed nut 170 . As a result, the conveyance nut 170 is released from restraint in the pull-out direction and the feed nut 170 is rotated in the pull-out direction along the lead screw 160 to move the carriage 140 relatively Can be stopped.

The foregoing has been shown and described with respect to specific embodiments of the invention. However, the present invention may be embodied in various forms without departing from the spirit or essential characteristics thereof, so that the above-described embodiments should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: interrupter chamber 111: load terminal
115: bus terminal 130: grounding truck body
131: Load terminal connection part 135: Ground bus bar
140: carriage 142: wheel
145: ground pin 150: girder
152: Fixing piece 154: Handle
156: handle coupling hole 157: rotation handle
160: Lead screw 170: Feed nut
172: pin-and-pin jaw 174: leading pin guide surface
175: Draw-out pin jaw 176: Draw-out pin guide surface
177: Female thread unit 180: Feed nut control unit
181: Frame 191: Inlet pin
193: incoming drive pin 195,205: connecting member
196: incoming spring 197,207: roller
201: Draw-out pin 203: Draw-out drive pin
206: withdrawal spring 210: interlock device
220: Solenoid 222: Coil
224: yoke 226: stationary core
228: movable core 231: return spring
233: Load 235: Cable
237: Connecting cable 239: Power connection
250: cam plate 251: first cam follower
252a: first horizontal section 252b: second horizontal section
252c: connection section 261: second camp file
262a: first section 262b: second section
265: pressing portion 267: cam plate return spring fixing portion
268: cam plate return spring 270: guide unit
272: guide slot 274: guide pin
280: power control unit 285: bus power connection

Claims (12)

A grounding bogie main body having a load terminal connection portion connected to a load terminal of the cutoff chamber and a ground bus bar connected to the load terminal connection portion;
A carriage having a wheel for movement and a ground pin connected to the ground bus bar and disposed below the ground bogie main body to move the ground bogie main body;
A girder disposed on a front surface of the carriage;
A lead screw rotatably connected to the girder at one end and rotatably connected to the carriage at the other end;
A feed nut provided on the carriage and screwed to the lead screw;
A feed nut control unit for restraining and releasing the feed nut; And
And an interlock device for releasing the constraint of the feed nut during the application of the bus power to the feed nail control unit,
Wherein the feed nut control unit includes a feed pin for restricting the feed nut when the lead screw is rotated in the feed direction,
The interlock device includes:
And a solenoid operable to release the restraint of the feed nut when the bus line is powered on. delete 2. The apparatus according to claim 1,
And a cam plate coupled to the solenoid, the solenoid having a first cam profile including a restraint position where the lead pin restrains the feed nut and a release position where the lead pin releases the restraint of the lead nut, Grounding of the circuit breaker. The method of claim 3,
Wherein the lead pin contacts the cam plate. ≪ RTI ID = 0.0 > 11. < / RTI > The method of claim 3,
Wherein the first cam profile includes a first horizontal section in which the inlet pin is positioned in the restraining position, a second horizontal section in which the inlet pin is positioned in the release position, and a second horizontal section in which the inlet pin is positioned in the release position, And a connection section for connecting the connection terminal of the circuit breaker in an oblique manner. 4. The interlock device according to claim 3,
And a guide unit provided on the carriage and the cam plate to guide movement of the cam plate. 7. The apparatus according to claim 6,
A guide pin formed on one of the carriage and the cam plate; And
And a guide slot formed on the other one of the carriage and the cam plate. The method of claim 3,
Wherein the feed nut control unit includes a lead pin for restricting the feed nut when the lead screw is rotated in the pull-out direction,
Wherein the cam plate further comprises a second cam profile provided with a restraint position where the lead pin restrains the feed nut and a release position by which the lead pin releases restraint of the feed nut. Grounding bogie. 9. The method of claim 8,
And the drawing pin is in contact with the cam plate. 9. The method of claim 8,
Wherein the second cam profile includes a first section in which the drawing pin is formed along a moving direction of the drawing pin so as to be movable between the holding position and the releasing position and a second section in which the drawing pin is held in the releasing position, And a second section formed perpendicular to the section of the circuit breaker. 4. The interlock device according to claim 3,
And a return spring for returning the cam plate to an initial position. 12. The interlock device according to any one of claims 1 to 11,
A bus line power detector for detecting whether the bus line is powered on; And
And a power supply control unit for controlling the power supply of the solenoid based on the detection result of the bus-line power detection unit.

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