JP2006166651A - Switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a switching device which exhibits an excellent radiation effect and assembly workability, while suppressing an increase in weight. <P>SOLUTION: An upper part main circuit conductor 11 is connected to the fixed contact 1a side of a vacuum switch tube 1 via an upper terminal 9, while a lower main circuit conductor 15 is connected to a movable contact 1b via a flexible conductor 13 and a lower terminal 14, and the entire bodies are mounted on a truck frame 3 to constitute the switching device. Both main circuit conductors 11, 15 comprise a bottomed cylinder conductor 17, and has a bolt hole 17a penetrating in the axial direction and a contact 18 which is provided at the end of the opening of the conductor 17, wherein the upper terminal 9 and the lower terminal 14 are connected to each other with the bolt 19 inserted into the conductor 17 from the end side of the opening. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power switchgear applied to, for example, power distribution facilities, and more particularly to the structure of a main circuit conductor thereof. In the present invention, the switching device is included in the switching device.

  For example, as shown in FIG. 4, the conventional switchgear is a fixed electrode derived from the fixed electrode side of the vacuum valve 41 in a vacuum circuit breaker using a vacuum valve (corresponding to the vacuum switch tube of the present invention) as the switchgear. The bar 41a is fixed to a conductor 43 supported and fixed to the insulating frame 42. The conductor 43 has a bar-like shape having a connector 45a for connecting to a busbar on the switchboard side through a main circuit terminal 44. Conductor 46a (corresponding to the main circuit conductor of the present invention) is connected. On the other hand, the movable electrode rod 41b of the vacuum valve 41 is connected to a main circuit terminal 48 through a flexible conductor 47, and a bar-shaped conductor 46b having a connector 45b at the tip is connected to the main circuit terminal 48. (See Patent Document 1).

Japanese Patent Laid-Open No. 6-208821 (second page, FIG. 1)

  In the above vacuum circuit breaker, the connector provided at the end of the conductor to connect to the bus on the switchboard side is composed of finger contacts, and this contact portion has a large contact resistance due to sliding contact. The heat generation is larger than the part. If the contact area is increased to suppress heat generation, it is necessary to increase the outer diameter of the conductor in contact with the contact. However, if the outer diameter is increased, the weight will be increased and the installation work of the conductor will be difficult. There was a problem of becoming.

  The present invention has been made to solve the above-described problems. It is an object of the present invention to obtain a switchgear having a main circuit conductor excellent in heat dissipation effect and good in assembly workability while suppressing an increase in weight. Objective.

  A switchgear according to the present invention is a switchgear that is detachably connected to a pair of main circuit disconnecting portions provided in a switchboard, and includes a vacuum switch tube having a fixed contact and a movable contact, An upper terminal connected to the contact side, an upper main circuit conductor having one end connected to the upper terminal and the other end connected to one main circuit disconnecting portion, and a lower portion connected to the movable contact side via a flexible conductor And a lower main circuit conductor having one end connected to the lower terminal and the other end connected to the other main circuit disconnecting portion. Both main circuit conductors have a bottomed cylindrical shape and penetrate the bottom in the axial direction. It is composed of a conductor part having a bolt hole and a contact provided at the opening end of the conductor part, and is connected to each of the upper terminal and the lower terminal by a bolt inserted into the conductor part from the opening end side. It is a thing.

According to the switchgear of the present invention, the upper main circuit conductor and the lower main circuit conductor are composed of a bottomed cylindrical conductor having a bolt hole at the bottom and a contact provided at the opening end of the conductor. In addition, the bolts inserted from the end of the opening are connected to the upper and lower terminals, so the required contact area can be secured by increasing the outer diameter of the conductor while suppressing the increase in weight, and heat dissipation. The area can also be increased. Therefore, it is possible to provide a switchgear having a main circuit conductor that is lightweight and has an excellent heat dissipation effect and can handle a large current.
Further, since the attachment work to the upper terminal and the lower terminal can be performed from the opening end side of the main circuit conductor, the assembly work of the main circuit conductor is facilitated.

Embodiment 1 FIG.
1 is a front view showing a switchgear according to Embodiment 1 of the present invention, which is partially broken and shows the inside. The switchgear according to the present embodiment will be described by taking a case where a vacuum switch tube is applied to the switchgear body as an example.
As shown in the figure, the vacuum switch tube 1 is mounted on a wheeled carriage frame 3 in which an operation mechanism 2 is accommodated, and can be connected to and separated from a pair of main circuit disconnecting portions 32 and 35 provided on a switchboard 31 described later. It is arranged connected to. The output from the operation mechanism 2 is transmitted to the insulating operation rod 6 through the output link 4 and the cross bar 5. The vacuum switch tube 1 has a fixed contact 1a and a movable contact 1b. The upper terminal 9 is connected to the fixed electrode rod 7 led out from the fixed contact 1 a together with the upper fixed plate 8, and the upper fixed plate 8 is supported and fixed to the carriage frame 3 via an insulating support insulator 10. Further, one end of an upper main circuit conductor 11 described later is connected to the upper terminal 9.

  On the other hand, the movable contact 1 b side of the vacuum switch tube 1 is connected to the lower terminal 14 through a flexible conductor 13 connected and held by the split terminal 12. One end side of the lower terminal 14 is fixed to the carriage frame 3 via the insulating support insulator 10, and one end of the lower main circuit conductor 15 is connected to the other end side. The insulating operation rod 6 is connected to the movable contact 1b, and the movable contact 1b is driven by the output of the operation mechanism 2, and the movable contact 1b and the fixed contact 1a are brought into contact with and separated from each other, thereby realizing a function as a switching device. The insulating support 16 is interposed between the upper terminal 9 and the lower terminal 14 and holds them.

  Next, the detailed structure of the upper main circuit conductor 11 and the lower main circuit conductor 15 will be described. Both have the same structure. 2A and 2B are views showing the upper main circuit conductor 11 and the lower main circuit conductor 15, wherein FIG. 2A is a front sectional view and FIG. 2B is a right side view. As shown in the figure, it is composed of a conductor part 17 having a bottomed cylindrical shape and having a bolt hole 17a penetrating in the axial direction at the bottom part, and a contactor 18 provided at the open end of the conductor part 17. The contact 18 is composed of a plate-like member having a shape as shown in the cross section of FIG. (A). As shown in FIG. (B), a plurality of contacts 18 are arranged in the circumferential direction and the outer periphery thereof is tightened by a spring. Yes. One of the two projecting portions provided on the inner peripheral side engages with a concave portion provided on the conductor portion 17 side to form an energization path. The other protrusion 18a is in sliding contact with the connection conductor on the main circuit disconnecting portion side. The number of bolt holes 17a is not limited to four, and may be appropriately selected depending on the size of the conductor portion 17.

  The conductor portion 17 is provided with a cooling air hole 17b. The number of the air holes 17b may be determined in consideration of the heat generation amount of the conductor from the size of the conductor and the current carrying capacity, and may be provided only when necessary.

  The attachment of the upper main circuit conductor 11 and the lower main circuit conductor 15 to the switchgear body side will be described. As shown in FIG. 1, screw holes are provided in the end surfaces of the upper terminal 9 and the lower terminal 14, and the bolt holes 17 a of the conductor portion 17 on the main circuit conductor side are aligned with the screw holes to open the conductor portion 17. The bolts 19 are inserted into the inner space from the end side and tightened to be connected and fixed to the upper terminal 9 and the lower terminal 14.

The upper main circuit conductor 11 and the lower main circuit conductor 15 of the switchgear thus assembled are connected to a pair of main circuit disconnecting portions 32 and 35 provided on the switchboard 31 side, as shown in FIG. . The main circuit disconnecting portion 32 includes a bushing 33 that is provided through the surface of the switchboard 31 and is formed in a cylindrical shape with an insulating material, and a connection conductor 34 that is held by the bushing 33. Similarly, the main circuit disconnecting portion 35 is composed of a bushing 36 and a connection conductor 37. The connection conductors 34 and 37 are connected to a bus bar on the switchboard 31 side not shown.
When the switchgear mounted on the carriage frame 3 is moved to the switchboard 31 side and pushed into the main circuit disconnecting portions 32, 35, the contacts 18 of the upper and lower main circuit conductors 11, 15 are connected to the connecting conductors 34, 37. Are inserted and electrically connected.

  Next, the operation will be described. For example, if the switchgear has a large current that exceeds 1,000 amperes, the heat generated in the current-carrying part becomes considerably large and high. In the energized state of the switchgear, the portion having the highest resistance and generating the most heat is the contact portion of the contact. That is, it is a contact portion of the contact 18 of the upper and lower main circuit conductors 11 and 15. In order to suppress heat generation in this portion, it is necessary to increase the diameter of the contact portion of the contactor 18 to increase the contact area and increase the current carrying capacity. Increasing the diameter of the contact portion inevitably increases the diameter of the conductor portion 17 and increases the weight. Therefore, by adopting a hollow structure as in the present embodiment, the weight can be reduced and the surface area (heat radiation area) can be increased while ensuring the diameter of the necessary contact portion. Further, the bolt can be tightened from the opening end side using the hollow portion.

Up to this point, the upper and lower main circuit conductors 11 and 15 have been described as having a shape having a straight bottomed cylindrical shape, but FIG. 3 is a diagram showing another example of the main circuit conductor. (A) of a figure is front sectional drawing, (b) is a right view. As illustrated, the main circuit conductor 20 includes a conductor portion 21 and a contact 18. The contact 18 is the same as that shown in FIG. The conductor portion 21 is formed with a taper so that the outer diameter is smaller on the bottom side than on the opening end side, and a bolt hole 21a is provided on the bottom portion.
As described above, in the energized state of the switchgear, the most heat generating part is the contact portion of the contact. Since the bottom of the main circuit conductor is firmly fastened to the mating terminal by bolts, the current capacity of the contact surface is large. Is possible. By utilizing this fact, a main circuit conductor having a shape as shown in FIG. 3 is obtained. If such a structure is adopted, the weight can be further reduced.
The number of bolt holes 21a at the bottom may be appropriately selected depending on the current carrying capacity and the size of the conductor. Further, as in the main circuit conductors 11 and 15 in FIG.

As described above, according to the invention of the present embodiment, the upper main circuit conductor connected to the upper terminal of the switchgear and the lower main circuit conductor connected to the lower terminal are formed in a bottomed cylindrical shape at the bottom. It is composed of a conductor part having a bolt hole penetrating in the axial direction and a contact provided at the opening end of the conductor part, and each of the upper terminal and the lower terminal by a bolt inserted into the conductor part from the opening end side. The main circuit conductor having a contact portion that requires a large contact area when energizing a large current is formed into a shape that can secure the contact area by increasing the outer diameter while suppressing an increase in weight. In addition, since the heat dissipating area can be increased, it is possible to provide a switchgear including a main circuit conductor that is lightweight and has an excellent heat dissipating effect.
Furthermore, since the main circuit conductor can be connected and fixed to the mating terminal from the opening end side, workability during assembly is improved. Further, since the fastening bolt does not appear outside, the electric field does not concentrate on the bolt portion.

  Further, since the outer diameters of the conductor portions of the upper main circuit conductor and the lower main circuit conductor are made smaller on the bottom side than on the opening end side, the weight can be further reduced in addition to the above effects.

  Furthermore, since the cooling vents are provided in the conductor portions of the upper main circuit conductor and the lower main circuit conductor, the ventilation is ventilated by the vents to improve the heat flow, thereby suppressing the temperature rise of the main circuit conductor. it can.

  The present invention can be widely applied to a switchgear provided in a high-voltage, high-current electric circuit and arranged so as to be able to contact and separate from the main circuit bus.

It is a front view which shows the switchgear by Embodiment 1 of this invention. It is a figure which shows the upper main circuit conductor and lower main circuit conductor of the switchgear by Embodiment 1 of this invention. It is a figure which shows the other example of the main circuit conductor of the switchgear by Embodiment 1 of this invention. It is a front view which shows the conventional switchgear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum switch pipe 1a Fixed contact 1b Movable contact 3 Bogie frame 9 Upper terminal 11 Upper main circuit conductor 13 Flexible conductor 14 Lower terminal 15 Lower main circuit conductor 17 Conductor part 17a Bolt hole 17b Vent 18 Contact 19 Volt 20 Main circuit Conductor 21 Conductor part 21a Bolt hole 31 Switchboard 32, 35 Main circuit disconnection part.

Claims (3)

  A switchgear that is detachably connected to a pair of main circuit disconnections provided on a switchboard, and is a vacuum switch tube having a fixed contact and a movable contact, and an upper part connected to the fixed contact A terminal, an upper main circuit conductor having one end connected to the upper terminal and the other end connected to the one main circuit disconnecting portion, a lower terminal connected to the movable contact side through a flexible conductor, and one end Is connected to the lower terminal and the other main circuit conductor is connected to the other main circuit disconnecting portion, and both the main circuit conductors have a bottomed cylindrical shape and penetrate the bottom portion in the axial direction. A conductor part having a bolt hole and a contact provided at the opening end of the conductor part, and each of the upper terminal and the lower terminal by a bolt inserted into the conductor part from the opening end side. It is characterized by connecting Closing device.   2. The switchgear according to claim 1, wherein an outer diameter of the conductor portion of the upper main circuit conductor and the lower main circuit conductor is smaller on the bottom side than on the opening end side.   3. The switchgear according to claim 1, wherein a cooling vent is provided in the conductor portion of the upper main circuit conductor and the lower main circuit conductor.

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