JP2012151952A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switchgear with improved countermeasures for electric shock prevention applied when maintenance and inspection are performed for external line cables and a load system.SOLUTION: A switchgear includes a drawer-type circuit breaker 2 housed in a circuit breaker chamber 1b in a housing 1 and an upper bushing 4a and a lower bushing 4b penetrating through a rear wall of the circuit breaker chamber 1b facing an upper terminal 3a and a lower terminal 3b led out from a back side of the circuit breaker 2. In this switchgear, one of both the upper bushing 4a and lower bushing 4b is connected to a bus 7 and the other is connected to an external line cable 9. A grounding device 10 which grounds a central conductor 4c of the upper bushing 4a and a central conductor 4d of the lower bushing 4b is disposed behind the circuit breaker 2 in the circuit breaker chamber 1b and an operation mechanism 17 for opening and closing the grounding device 10 is disposed on a front side in the housing 1.

Description

  The present invention relates to a switchgear in which a drawer type circuit breaker is accommodated, and more particularly to the configuration of the grounding device.

As a switchgear that can be provided with a conventional grounding device, for example, a configuration as shown in FIG. 12 is known. FIG. 12 is a side view showing the inside of the switchgear. In the figure, the inside of the casing 51 is partitioned by a partition plate, and a drawer-type circuit breaker 53 is accommodated in the device storage chamber 52. Corresponding to the upper and lower terminals derived from the back side of the circuit breaker 53, the partitioning plate behind the circuit breaker 53 is provided with upper and lower bushings 54, and the upper terminal of the circuit breaker 53 passes through the upper bushing 54. The lower terminal is connected to a load-side external cable 56 via a lower bushing 54. A grounding device 58 for grounding the load-side conductor 57 connected to the load cable 56 is provided for the purpose of reliably grounding the switchgear during maintenance and inspection. The grounding device 58 is connected to the operation mechanism portion by a drive link 59 and has a structure in which the grounding can be performed by operating the operation lever 60 in a state where the circuit breaker 53 is pulled out from the housing 51.
The switchgear having the above-described structure allows the cable room to be inspected by pulling out the disconnection type circuit breaker 53 to the front side of the casing 51 and disconnecting the grounding device 58 even when the bus 55 is being charged. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 62-195304 (page 5-7, FIG. 2)

  In order to maintain and check the external cable and load equipment, it is necessary to prevent the electric shock by grounding the relevant part securely. In the conventional structure such as Patent Document 1, there is a grounding device on the cable chamber side, and there is a problem that the state of the grounding device cannot be visually confirmed from the front of the housing when the circuit breaker is pulled out of the housing and disconnected. there were. One way to solve this problem is to provide a display device that can be viewed from the front of the housing and linked to the switching of the grounding device. However, there is a problem that the number of parts increases and the cost increases. It was.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a switch gear with improved measures for preventing electric shock when performing maintenance / inspection of an external cable and load equipment.

  The switchgear according to the present invention penetrates the rear wall of the circuit breaker chamber so as to face the drawer-type circuit breaker housed in the circuit breaker chamber in the housing and the upper terminal and the lower terminal led out from the back side of the circuit breaker. In a switchgear having an upper bushing and a lower bushing provided, one of the bushings being connected to the bus and the other being connected to the external cable, a grounding device for grounding the central conductor of the upper bushing and the lower bushing A grounding device for grounding the central conductor is disposed behind the circuit breaker in the circuit breaker chamber, and an operation mechanism for opening and closing the grounding device is disposed on the front side in the housing.

  According to the switchgear of the present invention, the grounding device for grounding the center conductor of the upper bushing and the grounding device for grounding the center conductor of the lower bushing are disposed behind the circuit breaker in the circuit breaker chamber, and open and close the grounding device. Since the operation mechanism is located on the front side of the housing, it is possible to select and ground the minimum necessary parts for maintenance / inspection of external cables and load equipment. Since the grounding part can be visually confirmed from the front surface of the housing in a state where the cable is pulled out and disconnected, a switchgear excellent in electric shock prevention measures can be provided.

It is a side view of the switchgear by Embodiment 1 of this invention. It is the top view seen from II-II of FIG. It is a figure which shows the structure of the grounding apparatus main-body part of the switchgear of FIG. It is explanatory drawing explaining operation | movement of the grounding device part of the switchgear of FIG. It is explanatory drawing of the grounding path | route of the grounding apparatus of the switchgear of FIG. It is a side view which shows the other example of the switchgear by Embodiment 1 of this invention. It is a side view of the switchgear by Embodiment 2 of this invention. It is the top view seen from VIII-VIII of FIG. It is a side view of the switchgear by Embodiment 3 of this invention. It is a figure which shows the structure of the grounding apparatus main-body part of the switchgear of FIG. It is a side view which shows the other example of the switchgear by Embodiment 3 of this invention. It is a side view of the conventional switchgear.

Embodiment 1 FIG.
FIG. 1 is a side view of the inside of a switchgear according to the first embodiment, and FIG. 2 is a plan view seen from an arrow II-II in FIG.
In FIG. 1, the inside of the switchgear housing 1 is partitioned by a partition plate from the front side into a control chamber 1a, a circuit breaker chamber 1b, a cable chamber 1c, and an upper busbar chamber 1d. Accommodates a drawer-type circuit breaker 2 movable in the front-rear direction. An upper terminal 3a and a lower terminal 3b are led out from the back side of the circuit breaker 2, and a three-phase upper bushing 4a and a lower bushing 4b are provided on the rear wall of the circuit breaker chamber 1b opposite to the upper terminal 3a and the lower terminal 3b. . Each of the upper terminal 3a and the lower terminal 3b has a contact, and can be fitted into and separated from the center conductors 4c and 4d of the opposing bushings 4a and 4b. An end of the central conductor 4 c of the upper bushing 4 a that protrudes toward the bus bar side 1 d is connected via a branch conductor 5 to a three-phase bus 7 that is fixed to the ceiling of the casing 1 by a support insulator 6. An end portion of the central conductor 4 d of the lower bushing 4 b that protrudes toward the cable chamber 1 c is connected to the external cable 9 via the connection conductor 8.
Moreover, the door is provided in the front side of the housing | casing 1, and the removable cover (not shown) is provided in the back side.

In FIG. 1, the upper bushing 4a is connected to the bus 7 and the lower bushing 4b is connected to the external cable 9. However, the cable chamber 1c and the bus chamber 1d are turned upside down, and the upper bushing 4a is connected to the external cable 9. And a switchgear having a configuration in which the lower bushing 4b is connected to the bus 7 (the same applies to the following embodiments).
Further, the configuration of the switch gear shows only the part necessary for the description of the invention.

A grounding device 10 is disposed behind the circuit breaker 2 in the circuit breaker chamber 1b and between the upper bushing 4a and the lower bushing 4b. For example, when the main circuit is disconnected by pulling out the pull-out type circuit breaker 2, the grounding device 10 is for grounding the charging current remaining in the main circuit to ensure the safety of work such as maintenance and inspection. It is.
Although details of the grounding device 10 will be described later, one rotating shaft 11 disposed between the upper bushing 4a and the lower bushing 4b, and one end side corresponding to each phase of the upper and lower bushings 4a and 4b are connected to the rotating shaft 11. The control chamber 1a on the front side of the housing 1 has a fixed and expandable three-phase blade 13 and a through shaft 15 (see FIG. 2) provided through the three-phase blade 13. The drive shaft 18 and the penetrating shaft 15 of the operation mechanism 17 disposed in the are connected by a link mechanism 19 described later.
As shown in the plan sectional view of FIG. 2, the operation mechanism 17 and the link mechanism 19 are arranged on the side surface side of the housing 1 (in the case of the figure, the left side surface as viewed from the front surface).

Next, details of the grounding device 10 will be described.
3A and 3B are diagrams showing the configuration of the main body of the grounding device 10, where FIG. 3A is a front view and FIG. 3B is a side view.
The grounding device 10 corresponds to each of the rotating shaft 11 and the three-phase bushings 4a and 4b, three storage boxes 12 fixed to the rotating shaft 11, and one end side of which can be moved into the storage box 12. A blade 13 having a contact 14 on the other end side (tip side), and a through shaft 15 provided in the vicinity of the contact 14 side of the blade 13 and integrally connecting the three blades 13. Have.
The connection terminals 16 are provided on the central conductors 4c and 4d of the upper and lower bushings 4a and 4b. When the blade 13 rotates, the contact 14 of the blade 13 contacts the connection terminal 16. Therefore, the contact 14 is composed of two contact pieces 14a and a spring 14b so that the connection terminal 16 can be sandwiched between the two contact pieces 14a. 14b is biased in a direction to sandwich the connection terminal 16.
The material of the blade 13 and the contact 14 is a copper material, and the penetrating shaft 15 and the rotating shaft 11 are iron or brass.

The grounding path of the grounding device 10 will be described with reference to FIG. Both ends of the rotating shaft 11 are supported by bearings 20 fixed to the housing 1 side. One bearing 20 is connected to one end of a ground wire 21 and the other end is a ground bus provided in the housing 1. (Not shown).
As indicated by broken lines in the figure, from the contact 14 of the blade 13 electrically connected to the central conductors 4c, 4d of the upper or lower bushings 4a, 4b, the blade 13, the through shaft 15, the storage box 12, A grounding path that passes through the moving shaft 11, the bearing 20, and the grounding wire 21 is secured, and the contact 14 of the blade 13 is always at ground potential.

Next, returning to FIG. 4, the details of the link mechanism 19 will be described.
The link mechanism 19 includes a drive lever 22 provided on the drive shaft 18 of the operation mechanism 17, an intermediate shaft rotation lever 24 supported by an intermediate shaft 23 fixed to the housing 1, and the drive lever 22 and the intermediate shaft. A drive link 25 that connects one end side of the rotation lever 24 is provided. The other end side of the intermediate shaft rotation lever 24 is rotatably connected to one end portion of the through shaft 15 of the grounding device 10.

Next, the operation of the grounding device 10 will be described with reference to FIG.
First, the normal operation state will be described. 4A shows a normal operation state, FIG. 4B shows a state where the upper bushing 4a side is grounded, and FIG. 4C shows a case where the lower bushing 4b side is grounded.
In the normal operation state, the drive lever 22, the drive link 25, and the intermediate shaft rotation lever 24 of the operation mechanism 17 are all in the horizontal direction and are fixed in this state, as shown in FIG. . As a result, the blade 13 is also fixed in the horizontal direction, and the blade 13 has the shortest length in a state where the blade 13 is pushed into the storage box 12.
In this state, the grounding device 10 is not connected to either the upper bushing 4a side or the lower bushing 4b side of the switch gear, and the grounding device 10 is in the open state. The grounding operation as shown below is started in a state where the drawer type circuit breaker 2 is pulled out for maintenance and inspection.

  Since the operations of the upper and lower bushings 4a and 4b are similar (symmetrical) operations, the operation of grounding the upper bushing 4a side will be mainly described. As shown in FIG. 4B, by inserting the operation handle 26 from the front surface of the operation mechanism 17 and rotating it upward as indicated by an arrow, the drive lever 22 rotates clockwise around the drive shaft 18 in the figure. To do. As a result, one end side of the drive link 25 connecting the drive lever 22 and the intermediate shaft rotation lever 24 moves downward, and the intermediate shaft rotation lever 24 rotates counterclockwise about the intermediate shaft 23.

At this time, since the operation cannot be performed unless the length of the drive link 25 portion is extended, the intermediate shaft turning lever 24 is provided with a long hole 24a, and the pin 25a provided on the drive link 25 side slides into the long hole 24a. To be combined.
By rotating the intermediate shaft rotation lever 24 in the counterclockwise direction, the penetrating shaft 15 engaged therewith is pushed upward, and the three-phase blade 13 fixed to the penetrating shaft 15 in conjunction with it is pulled diagonally upward to the left. At the same time, it rotates clockwise around the rotation shaft 11 and extends while sliding in the storage box 12. Finally, with the blade 13 fully extended, the contact 14 at the tip is fitted to the connection terminal 16 provided on the center conductor 4c of the upper bushing 4a, and the state shown in FIG.

When the lower bushing 4b side is grounded, the operation is basically symmetric with the upper bushing 4a side, so detailed description is omitted. However, the operation handle 26 is inserted and the arrow shown in FIG. The intermediate shaft rotation lever 24 rotates clockwise in the drawing in conjunction with the movement of the drive link 25, and the blade 13 moves diagonally to the left in the drawing in conjunction with this movement. In addition to being pulled, it rotates counterclockwise around the rotation shaft 11 and extends while sliding in the storage box, finally resulting in a state as shown in (c).
In order to return to the normal operation state, the above operations may be reversed.

By having the structure as described above, when the breaker 2 is pulled out of the housing 1 and disconnected during maintenance / inspection of the external cable 9 and the load facility, the upper bushing 4a or the lower bushing from the front of the switchgear. Since the grounding state in which the central conductors 4c and 4d of 4b are fitted to the grounding device 10 can be visually confirmed, it is possible to provide a switchgear that is improved in measures to prevent electric shock.
Further, in this switchgear grounding device 10, not only the external cable 9 side but also the bus 7 side can be grounded, and these can be selectively performed by one grounding device 10.
In addition, since the extendable blade 13 is provided, the length of the blade 13 becomes the shortest in the normal operation state, and it becomes easy to secure an insulation distance from the peripheral charging portions such as the upper bushing 4a and the lower bushing 4b. The gear can be reduced.

Up to this point, the case where the upper bushing 4a side and the lower bushing 4b side are selected and grounded with one grounding device 10 has been described. Next, this application example will be described.
As shown in FIG. 6, when there is a margin between the upper bushing 4a and the lower bushing 4b, a grounding device similar to that described above is provided separately for the upper bushing 4a and the lower bushing 4b. Also good. Since the operation of the blade is the same as that described in FIGS. 1 to 4 (however, only one side operation), the description thereof is omitted.
By arranging the same grounding devices 27a and 27b upside down, a configuration as shown in FIG. 6 is possible. The link mechanism 28a and the operation mechanism 29a of the upper stage grounding device 27a are disposed on one side surface of the housing 1, and the link mechanism portion 28b and the operation mechanism 29b of the lower stage grounding device 27b are disposed on the other side surface of the housing 1.
In this way, by separately providing the grounding devices corresponding to the upper and lower bushings 4a and 4b, the bus 7 side and the external cable 9 side can be grounded simultaneously.

As described above, according to the switchgear of the first embodiment, the drawer-type circuit breaker housed in the circuit breaker chamber in the housing is opposed to the upper terminal and the lower terminal derived from the back side of the circuit breaker. In a switchgear having an upper bushing and a lower bushing penetrating in the rear wall of the circuit breaker chamber, one of the bushings being connected to the bus and the other being connected to the external cable, the central conductor of the upper bushing Since the grounding device for grounding and the grounding device for grounding the central conductor of the lower bushing are arranged behind the circuit breaker in the circuit breaker room, the operation mechanism for opening and closing the grounding device is arranged on the front side in the housing, The minimum necessary parts can be selected and grounded during maintenance and inspection of the external cable and load equipment, and the grounding unit can be connected from the front of the chassis with the breaker pulled out from the switchgear chassis and disconnected. For possible confirmation of visual observation, it is possible to provide a superior switchgear electric shock prevention measures.

  In addition, the grounding device includes a rotating shaft disposed between the upper bushing and the lower bushing, and a telescopic blade having one end fixed to the rotating shaft and the other end connected to the operation mechanism via a drive link. The blade is shortened to the shortest in the normal operation state, and is rotated around the rotation axis while being extended by the grounding operation of the operation mechanism, and the tip is connected to the central conductor of the bushing to be grounded In addition to the above effects, the blade length is the shortest in the normal operation state, and it is easy to secure the insulation distance from the peripheral charging parts such as the upper bushing and the lower bushing. Can be miniaturized.

  The grounding device is composed of one grounding device arranged between the upper bushing and the lower bushing, and the blade is selected as the central conductor of either the upper or lower bushing by the operation of one operating device. In addition to the above-described effects, the grounding of the external cable side and the busbar side can be performed by one grounding device, so that the size of the device can be reduced.

  The grounding device is composed of an upper grounding device corresponding to the upper bushing and a lower grounding device corresponding to the lower bushing, and the operation mechanism is provided individually corresponding to each grounding device. The cable side can be grounded at the same time.

Embodiment 2. FIG.
7 shows a side view of the switchgear according to the second embodiment, and FIG. 8 is a plan view seen from arrows VIII-VIII in FIG. Parts equivalent to those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Below, it demonstrates centering around difference. The difference is the configuration of the grounding device and the link mechanism.

As for the grounding device, an upper grounding device 30a for the upper bushing 4a and a lower grounding device 30b for the lower bushing 4b are individually provided between the upper and lower bushings 4a and 4b behind the circuit breaker 2 in the circuit breaker chamber 1b. It has been. Since the two grounding devices 30a and 30b are basically arranged symmetrically in the vertical direction, the upper grounding device 30a will be described as a representative.
The upper grounding device 30a includes three blades 32a fixed to the rotating shaft 31a so as to correspond to the rotating shaft 31a disposed at the lower portion of the upper bushing 4a in the circuit breaker chamber 1b and the three-phase upper end bushing 4a. And a contactor 33 provided at the tip thereof. The contactor 33 is composed of a contactor piece and a spring as in the first embodiment, and has a spring pressure.

The link mechanism connects the rotation lever 34a fixed to one end of the rotation shaft 31a, the drive lever 36a provided on the drive shaft of the operation mechanism 35a disposed in the control chamber 1a, and both levers 34a and 36a. The drive link 37a is used.
As shown in FIG. 8, the operation mechanism 35 a and the link mechanism are arranged on one side surface (in the drawing, the left side surface as viewed from the front surface) in the housing 1.

The lower stage grounding device 30b may be provided with the same configuration as the upper stage side upside down. In this case, the operation mechanism 35b, the rotation lever 34b, the drive link 37b, and the drive lever 36b are arranged on the right side as viewed from the front as shown in FIG.
As in the first embodiment, a ground wire (not shown) is connected to the bearings of the rotating shafts 31a and 31b, and the ground wire is connected to a ground bus (not shown). As a result, a grounding path from the contactor 33-blade 32a (32b) -rotating shaft 31a (31b) to the grounding wire-grounding bus via the bearing is secured, and the contactor 33 is always at ground potential. Yes.

Next, the operation will be described.
In the normal operation state, as indicated by solid lines in FIG. 7, the blades 32a and 32b are disconnected from the bushings 4a and 4b, the blade 32a of the upper stage grounding device 30a is rotated downward, and the lower grounding device 30b The blade 32b is rotated upward and stopped.
The grounding operation when the drawer-type circuit breaker 2 is pulled out for maintenance / inspection will be described using the upper stage grounding device 30a.
For the operation, a dedicated operation handle 26 is inserted into the front surface of the operation mechanism 35a, and the operation handle 26 is rotated upward. As a result, the drive lever 36a rotates clockwise in the drawing, and the rotation lever 34a connected to the drive link 37a also rotates clockwise. By this operation, the rotating shaft 31a and the blade 32a fixed thereto are also rotated in the clockwise direction, and the contact 33 is fitted and connected to the connection terminal 16 (see FIG. 8) provided on the central conductor of the upper bushing 4a. The grounding operation is completed.

The operation of the lower grounding device 30b is symmetrical to the above, and in conjunction with the operation of rotating the operation handle 26 downward, the blade 32b rotates counterclockwise, and the contactor 33 moves to the center of the lower bushing 4b. The connection terminal 16 provided on the conductor is fitted and connected.
When returning to the normal operation state, the reverse operation of the above series of operations may be performed.

With the configuration of the switch gear as described above, when the circuit breaker 2 is pulled out of the housing 1 and disconnected during maintenance / inspection of the external cable 9 and the load facility, the upper bushing 4a or the lower bushing from the front of the switch gear. Since the connection state between the 4b side and the upper grounding device 30a or the lower grounding device 30b, that is, the grounding state can be visually confirmed, it is possible to provide a switchgear with improved measures for preventing electric shock.
Further, according to this switchgear configuration, not only the external cable 9 side but also the bus 7 side can be grounded, and further improvement of the electric shock prevention effect can be expected by grounding the bus 7 side and the external cable 9 side. .
Further, during normal operation, the blade 32a of the upper stage grounding device 30a is positioned directly downward, and the blade 32b of the lower stage grounding device 30b is positioned directly upward. A sufficient insulation distance from the upper and lower terminals 3a and 3b can be secured.

  As described above, according to the switchgear of the second embodiment, the grounding device includes the upper stage grounding device that is provided on the upper stage pivot shaft and has a blade that rotates and can contact and separate from each phase of the upper stage bushing. A lower grounding device having a blade provided on a rotating shaft and having a blade that rotates and can be contacted / separated with each phase of the lower bushing, is disposed between the bushings, and is provided by an operation mechanism provided corresponding to each grounding device. By rotating each rotation shaft through the drive link, each blade is rotated and connected to the center conductor of the corresponding bushing so that it is grounded. The cable sides can be grounded individually or simultaneously. In addition, since the circuit breaker is pulled out from the switchgear housing and disconnected, the grounding part can be visually confirmed from the front surface of the housing, so that it is possible to provide a switchgear that is excellent in measures for preventing electric shock.

Embodiment 3 FIG.
FIG. 9 is a side view of the switchgear according to the third embodiment. FIG. 10 is a detailed view showing the configuration of the grounding device main body, where (a) is a front view and (b) is a side view.
The same parts as those in FIG. Since the configuration of the grounding device is similar to that of the second embodiment, the following description will focus on differences from the second embodiment.
In the second embodiment, since the grounding device is provided between the upper and lower bushings 4a and 4b in the rear part of the circuit breaker chamber 1b, an upper and lower bushing interval for arranging two grounding devices is necessary. It was. Therefore, the third embodiment is configured such that it can be disposed even when the upper and lower bushing intervals are narrow. Since the two grounding devices are basically arranged symmetrically in the vertical direction, the upper grounding device will be described as a representative.

As shown in FIG. 9, the upper stage grounding device 38a includes an upper stage rotating shaft 39a disposed above the upper stage bushing 4a and a lower part of the upper stage rotating shaft 39a sandwiching the upper stage bushing 4a in parallel with the upper stage rotating shaft 39a. The upper grounding bar 40a, the contact 33 provided on the upper grounding bar 40a corresponding to each phase of the upper bushing 4a, and the upper rotating shaft 39a disposed between the phases of the three-phase bushing 4a. The upper arm 41a is connected to the upper ground bar 40a. (In the lower part, the subscript of the code is b and the explanation is omitted.)
The link mechanism is the same as that of the second embodiment (however, the rotation angle is different), the rotation lever 34a (see FIG. 10) fixed to one end of the upper rotation shaft 39a, and the control chamber 1a. The drive lever 36a is provided on the drive shaft of the operating mechanism 35a disposed on the drive mechanism 37a, and the drive link 37a connects the levers 34a and 36a.

The grounding operation is the same as in the second embodiment. If it demonstrates on the upper stage side, the operation lever 35a of the operation mechanism 35a will rotate clockwise in the figure by inserting the operation handle 26 for exclusive use in the front surface of the operation mechanism 35a, and turning it upwards, and the drive link 37a The connected turning lever 34a also turns clockwise. By this operation, the upper stage rotating shaft 39a and the upper stage arm 41a, the upper stage grounding bar 40a and the contact 33 fixed to the upper stage rotating shaft 39a are also rotated clockwise, and the contact 33 is fitted to the connection terminal 16 of the upper stage bushing 4a. Connected. The grounding path is a path from the contactor 33-upper grounding bar 40a-upper arm 41a-upper rotating shaft 39a to the grounding line via a bearing.
The lower stage grounding device 36b has a similar (symmetric) operation, and the reverse operation described above may be performed when returning to the normal state.

Next, a modification of FIG. 9 will be described. FIG. 11 is a side view showing a switchgear of the modification of FIG. The difference from FIG. 9 is that the arrangement of the rotating shaft and the grounding bar is reversed with respect to the bushing.
As shown in FIG. 11, the rotating shafts 39a and 39b of the grounding devices 38a and 38b are disposed inside the upper bushing 4a and the lower bushing 4b, and the grounding bars 40a and 40b are disposed on the upper and lower bushings 4a, It is arranged outside 4b. That is, the upper stage grounding device in FIG. 9 is arranged on the lower stage side in FIG. 11, and the lower stage grounding apparatus in FIG. 9 is arranged on the upper stage side in FIG.
Since the operation is the same as that in FIG.

  As another modification, the upper grounding device and the lower grounding device are not symmetrically arranged, for example, the upper grounding device in FIG. 9 and the lower grounding device in FIG. 11, or the lower grounding device in FIG. 9 and FIG. The upper and lower grounding devices may be combined to have the same configuration at the top and bottom.

As described above, according to the switchgear of the third embodiment, the grounding device includes the upper stage grounding formed by connecting the upper stage bushing with the upper stage rotating shaft and the upper stage grounding bar arranged in parallel above and below the upper stage bushing. And a lower stage grounding device in which a lower stage rotating shaft and a lower stage grounding bar arranged in parallel above and below the lower bushing are connected by an arm, and are provided corresponding to each grounding device. By rotating each rotation shaft through the drive link by the operating mechanism, the grounding bar rotates together with the arm, and the contact provided on the grounding bar is connected to the center conductor of each phase of the corresponding bushing. The grounding device for the upper bushing and the grounding device for the lower bushing can be arranged without difficulty even when the space between the upper and lower bushings is narrow, enabling downsizing of the device. , It is possible to obtain the same effect as in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Case 1a Control room 1b Circuit breaker room 1c Cable room 1d Bus bar room 2 Circuit breaker 3a Upper terminal 3b Lower terminal 4a Upper bushing 4b Lower bushing 4c, 4d Center conductor 5 Branch conductor 6 Support insulator 7 Bus 8 Connection conductor 9 Outer cable DESCRIPTION OF SYMBOLS 10 Grounding device 11 Rotating shaft 12 Storage box 13 Blade 14 Contact 14a Contact piece 14b Spring 15 Through shaft 16 Connection terminal 17 Operation mechanism 18 Drive shaft 19 Link mechanism 20 Bearing 21 Ground wire 22 Drive lever 23 Intermediate shaft 24 Intermediate shaft Rotating lever 25 Drive link 26 Operation handle 27a Upper grounding device 27b Lower grounding device 28a, 28b Link mechanism 29a, 29b Operating mechanism 30a Upper grounding device 30b Lower grounding device 31a, 31b Rotating shaft 32a, 32b Blade 33 Contact 34a, 34b Rotation Chromatography 35a, 35b operating mechanism 36a, 36b driving lever 37a, 37b drive link 38a upper grounding device 38b lower grounding device 39a upper pivot shafts 39b lower rotary shafts 40a upper ground bar 40b lower ground bar 41a upper arm 41b lower arm.

Claims (6)

A drawer type circuit breaker housed in a circuit breaker chamber in the housing, an upper bushing penetrating the rear wall of the circuit breaker chamber facing the upper terminal and the lower terminal derived from the back side of the circuit breaker; A switchgear having a lower bushing, wherein one of the bushings is connected to a bus and the other is connected to an external cable;
A grounding device for grounding the central conductor of the upper bushing and a grounding device for grounding the central conductor of the lower bushing are arranged behind the circuit breaker in the circuit breaker chamber, and an operation mechanism for opening and closing the grounding device, A switchgear, wherein the switchgear is disposed on a front side in the housing. The switchgear according to claim 1, wherein
The grounding device includes a pivot shaft disposed between the upper bushing and the lower bushing, and a telescopic structure having one end fixed to the pivot shaft and the other end coupled to the operation mechanism via a drive link. Blades and
The blade is shortened to the shortest in a normal operation state, and is rotated about the rotating shaft while extending by the grounding operation of the operation mechanism, and the tip is connected to the central conductor of the bushing to be grounded. A switchgear characterized by being configured as described above. The switchgear according to claim 2,
The grounding device is composed of a single grounding device disposed between the upper bushing and the lower bushing, and the blade is moved by either one of the upper bushing or the lower bushing according to the operation of the one operating device. A switchgear configured to be selectively connectable to the central conductor. The switchgear according to claim 2,
The grounding device includes an upper grounding device corresponding to the upper bushing and a lower grounding device corresponding to the lower bushing, and the operation mechanism is individually provided corresponding to each grounding device. Switch gear characterized by The switchgear according to claim 1, wherein
The grounding device includes an upper grounding device having a blade that is provided on an upper rotating shaft and rotates to be able to contact and separate from each phase of the upper bushing, and an upper grounding device that is provided on a lower rotating shaft and rotates to rotate the lower bushing. A lower grounding device having a blade that can contact and separate from each phase, and is arranged between the bushings, and the rotation mechanism is provided via the drive link by the operation mechanism provided corresponding to each grounding device. The switchgear is configured such that each blade is rotated and connected to the center conductor of the corresponding bushing to be grounded. The switchgear according to claim 1, wherein
The grounding device has an upper grounding device in which an upper pivot shaft and an upper grounding bar that are arranged in parallel above and below the upper bushing are connected by an arm,
A lower stage grounding device in which a lower stage rotating shaft and a lower stage grounding bar arranged in parallel above and below the lower stage bushing are connected by an arm,
The grounding bar is rotated together with the arm by rotating the rotation shafts via the drive links by the operation mechanisms provided corresponding to the grounding devices, and is provided on the grounding bar. A switchgear characterized in that a contact is connected to the center conductor of each phase of the corresponding bushing and grounded.

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