JPH0567115U - Switchgear grounding device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a switchgear grounding device capable of easily and safely grounding a main circuit even in a switchgear where the main circuit conductor is not exposed in the panel body. [Structure] Draw-out type circuit breaker 17 housed in the panel body 10
On the outside of the primary disconnection bushing 11 that contacts and separates with the grounding contact 22 connected to the internal conductor of the bushing 11.
The ground blade 2 which leads the
5, the bushing 11 is integrally provided with an insulating envelope 23 that covers the outer circumference of the grounding contact 22 with the blade 25 opening left, and the blade 25 is opened and closed. 26 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switchgear grounding device for grounding a main circuit in a panel body.

[0002]

[Prior Art]

 Conventionally, the switchgear, in which the draw-out main circuit device such as a circuit breaker is housed in the panel body, has the structure shown in Fig. 3, for example, when an air-insulated bus bar is used. A partition plate 2 for partitioning the inside of 1 into front and back is provided with upper and lower primary disconnection bushings 3 and 4 of three phases, and a bus bar 5 drawn into the rear part of the board body 1 for each phase The board body 1 is branched by the conductor 6 and connected to the upper disconnection bushing 3 respectively, and the lower disconnection bushing 4 is connected to the three-phase cable bushing 8 via the flexible conductor 7, respectively. A retractable circuit breaker 9 is housed in the front part of the inside, and upper and lower terminals of the circuit breaker 9 are connected to both disconnecting section bushings 3 and 4 so as to be able to come into contact with and separate from each other.

Further, a switchgear using a solid insulation type bus bar is configured as shown in FIG. 4, for example, and a rear face plate of the board body 10 has three phase upper and lower primary disconnection section bushings 11 and 12. The three-phase busbars 13 of the solid insulation type disposed on the back surface of the board body 10 are connected to the disconnecting part bushings 12 at the bottom, respectively, and are housed in the container 14, and -The cable connector 16 of the bull 15 is detachably connected to the disconnecting section bushing 11 above the rear surface, and the circuit breaker 17 housed in and out of the board body 10 is connected to both disconnecting section bushings 11 and 12. It is connected so that it can come in and out freely.

By the way, since the switchgear described above does not have a grounding switch in the panel, when grounding the main circuit at the time of maintenance or inspection, a grounding foot connected to a grounding wire is used. Ku stick is used.

That is, in the switchgear shown in FIG. 3, as shown by the chain double-dashed line in the figure, with the breaker 9 pulled out, the rear door of the panel body 1 is opened and the cable bushing is opened. By inserting the ground terminal 18 attached to No. 8 into the hook portion at the tip of the ground hook bar 19, the main circuit is grounded via the ground wire 20 connected to this hook portion.

In the switchgear shown in FIG. 4, the circuit breaker 17 is pulled out from the board body 10, and the grounding hook bar 19 is inserted from the front surface of the board body 10 to disconnect the upper disconnecting portion bushing 11 The hook portion is connected to the contact of the above, and the main circuit is grounded through the ground wire 20.

[0007]

[Problems to be solved by the device]

 In the above-mentioned prior art, when the main circuit is grounded, a person uses the hook bar 19 to directly ground the main circuit conductor, which is very dangerous and difficult to operate. In the case of the switch gear, the circuit breaker 17 has to be pulled out of the panel body 10, which causes a problem of complicated grounding operation.

Conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 62-195304, a grounding switch connected to the main circuit conductor is provided in a board body accommodating a drawer type main circuit device. In some cases, the main circuit is grounded by operating the lever from outside the panel while the main circuit device is disconnected, and turning on the ground switch.

However, in the case of the switchgear shown in FIG. 4, since the solid insulation type busbar 13 is used, there is no exposed portion of the main circuit conductor in the panel body 10, and thus the exposed main circuit conductor is not present. Therefore, the technology of the above publication in which a part of the above is connected to the ground switch cannot be adopted.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to simplify a switch gear using a bus bar of a solid insulation type. Moreover, it is to provide a switchgear grounding device that can safely ground the main circuit.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, in the switchgear grounding device of the present invention, connected to the inner conductor of the bushing on the outside of the primary disconnection bushing where the pull-out type main circuit device housed in the board main body comes in contact with and separates from Take out the grounded contactor, and provide a grounding blade that contacts and separates from this contactor, and covers the outer periphery of the grounding contactor integrally with the primary disconnection bushing, leaving the blade inlet. An insulating enclosure is provided, and an operating device for opening and closing the blade is provided.

[0012]

[Action]

 In the grounding device having the above-mentioned configuration, the main circuit device is disconnected from the primary disconnection bushing, and the operating device is closed, so that the contactor for grounding introduced from the primary disconnection bushing is operated. The ground blade contacts and the main circuit conductor is grounded through the internal conductor of the primary disconnection bushing.

In this case, the main circuit device does not need to be pulled out of the main body of the panel, and may be retracted to the disconnection position with respect to the primary disconnection section bushing, and the primary disconnection section bushing may be connected via the ground contactor. Since the inner conductor of the above is led to the outside, the main circuit can be grounded without exposing this bus conductor even when a solid insulation type bus bar is used.

[0014]

【Example】

 An example will be described with reference to FIGS. 1 and 2. Similar to the case of FIG. 4, this embodiment is applied to a switch gear using a solid insulation type bus bar, and the same reference numerals as those used above denote the same or corresponding ones, and 21 denotes a lead conductor. In the three-phase upper primary disconnection bushing 11 which is arranged in the left-right direction on the rear surface of the board body 10 and extends through the bottom surface of the hole of the bushing 11 into which the terminal of the circuit breaker 17 is inserted. Each of the bases of the lead-out conductors 21 is connected to the inner conductor of the bushing 11 at the bottom of the hole, and the grounding contact 22 is integrated with the tip of the lead-out conductor 21 led out to the upper surface of the bushing 11. It is provided in. Reference numeral 23 denotes a planar U-shaped insulating enclosure provided so as to cover the rear side and the left and right sides of the ground contactor 22, and is integrally formed on the upper surface of the bushing 11.

Reference numeral 24 denotes a three-phase support base fixed to the upper portion of the rear plate in the board body 10 corresponding to the bushings 11 of each phase, and 25 is supported by each support base 24 so as to be vertically rotatable. It is a grounding blade, and the grounding wire is connected to the base portion, and the respective tip portions are loosely inserted into the envelope body 23 through the openings of the upper surface and the front surface thereof to come into contact with and separate from the grounding contactor 22.

Numeral 26 is an operating unit which is disposed on the upper front side in the box 10 and whose output shaft is connected to the rotating shaft of the ground blade 25 through levers, links, etc. The blade 25 of each phase is driven to rotate.

With such a configuration, when the main circuit is grounded for maintenance, inspection, etc. from the operating state as shown in FIG. 2, first, the main contact of the circuit breaker 17 is opened and then the circuit breaker is disconnected. The device 17 is pulled out to the position indicated by the dashed line in FIG. 2 (disconnection position), and the main circuit bushings 11 and 12 are disconnected as shown in FIG.

After that, the operation device 26 is operated electrically or manually to rotate the ground blade 25 downward, that is, backward, and insert the tip of the ground blade 25 into the envelope 23 to contact the ground contact 22. Let me

Therefore, the internal conductor of the primary disconnection bushing 11 is grounded through the lead-out conductor 21, the grounding contact 22 and the grounding blade 25 to ground the main circuit. In addition, when returning to the normal operating state, the procedure is reversed.

In addition, in the primary disconnection bushing 11 in which the grounding contact 22 is led out, in addition to increasing the insulation strength of the grounding contact 22 with the enclosure 23, the inside of the bushing 11 in the board body 10 The abdomen has a small diameter and a corrugated fold is formed to ensure a required creepage insulation distance between the rear surface of the board body 10. Further, the above-mentioned embodiment is the case of the switchgear accommodating the circuit breaker 17, but the present invention is not limited to this, and the present invention is similarly applied to a switchgear accommodating other drawer type main circuit devices such as a disconnector. It can be implemented.

[0021]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. Pull out the grounding contact connected to the inner conductor to the outside of the primary disconnection bushing where the pull-out type main circuit device comes in contact with and separate from it, and operate the ground blade with the operating device to connect to the grounding contact. The main circuit is configured to be separated and grounded via the grounding contact and the grounding blade, so the main circuit can be easily grounded without pulling out the main circuit device from the outside of the panel body. It is safe because the grounding operation can be performed by operating the switchgear.It is safe and easy even for a switchgear that uses a solid insulation type bus bar, that is, a switchgear where the main circuit conductor is not exposed in the panel body. It can be grounded.

[Brief description of drawings]

FIG. 1 is a side view of a switch gear grounding device according to an embodiment of the present invention when grounded.

FIG. 2 is an overall side view of a normal operating state of the embodiment.

FIG. 3 is a side view of a conventional example.

FIG. 4 is a side view of another conventional example.

[Explanation of symbols]

 10 Board Main Body 11 Primary Disconnection Bushing 17 Circuit Breaker 22 Grounding Contact 23 Enclosure 25 Grounding Blade 26 Manipulator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eisaku Tachibana 47 Umezu Takaunecho, Ukyo-ku, Kyoto City Nissin Electric Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A grounding contact, which is led out to the outside of a primary disconnection bushing with which a pull-out type main circuit device housed in a panel body comes in contact with and separates from and is connected to an internal conductor of the bushing,
The ground blade which is brought into contact with and separated from the contact, the insulating envelope which is provided integrally with the bushing and covers the outer periphery of the contact leaving the blade inlet, and the blade. Switchgear grounding device equipped with an operating device that opens and closes.