JPH043377Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a vacuum switch using a vacuum interrupter.

B. Summary of the invention This invention provides a movable conductor on the top of an L-shaped insulating frame, and fixes the fixed lead rod of the vacuum interrupter placed between the insulating frame and the movable conductor to the insulating frame. In a vacuum switch in which the movable lead rod is slidably penetrated into the movable conductor via a contact while being connected to the side conductor, one end of the movable conductor and the insulating frame are connected with an insulating connecting member. By doing so, the attachment of the movable side conductor to the insulating frame is strengthened and vibration of the movable side conductor due to electromagnetic force is prevented.

C. Prior Art A ring main circuit is used in order to enable repair of the failed line while supplying power to other load lines when a fault occurs in one load line.

In order to configure this ring main circuit, the switching devices shown in FIGS. 4 to 7 have conventionally been used. The switching device will be explained below with reference to its circuit diagram (FIG. 3). In FIG. 3, the same reference numerals are given to the same parts as those of the opening/closing device.

As shown in FIGS. 4 to 6, vacuum switches A and B are arranged on both sides of the upper part of the pedestal 20, and a vacuum switch C is arranged between vacuum switches A and B. The grounding mechanism disconnectors 16a, 16 of these vacuum switches A, B, C are connected by the T branch 19 arranged horizontally behind the vacuum switches A, B, C.
b and 16c are connected to each other. A power fuse 18 is arranged below the vacuum switch C, and a grounding device 17c is arranged behind the power fuse 18 (see FIG. 5).

These vacuum switches A, B, C and T branch 1
9 and the grounding device 17c are housed inside the casings 21 to 25, and the insides of these casings 21 to 25 are filled with SF ₆ gas as an insulating gas, so that the pressure inside the casings is
0.10mpa, temperature is set at 12-16°C. The insulating gas is not limited to SF ₆ gas, but also SF ₆ gas (0~
60)% air can be used.

Next, each part will be explained.

Since the vacuum switches A and B have the same structure, the vacuum switch B will be explained based on FIG. 7, which is an enlarged view of FIG. 6. The three-phase vacuum interrupter 15b inside the housing 22 is attached to the housing 22 via an L-shaped insulating frame 26, and the fixed lead rod 27 of the vacuum interrupter 15b is fixed to the insulating frame 26 and fixed. It is connected to the side conductor 28. Additionally, a ground terminal 30 is attached to the fixed lead rod 27.
is fixed thereto, and a grounding blade 29 rotatably provided near the grounding terminal 30 and operated by an operating device 44 constitutes a grounding device 17b. On the other hand, the movable lead rod 31 of the vacuum interrupter 15b is in sliding contact with a movable conductor 32 integrally molded with the insulating frame 26 via a ring contact (not shown), and the movable conductor 32 rotates around a shaft 33. A blade 34 is movably attached. The blade 34 is in contact with a connecting conductor 35, and the connecting conductors 35 for three phases are each connected to a conductor 37 via a cable 36. 3
8 is a bushing, and 39 is an insulating conductor support. A ground terminal 41 is attached to the upper part of the housing 22 via a bushing 40, and a ground bar 42 is connected to the ground terminal 41. The tip of an insulating rod 43 is rotatably connected to the center of the blade 34 in order to rotate the blade 34 around the pin 33, and the base end of the insulating rod 43 is moved in the direction of the arrow by an operating device 44. Operating shaft 45 to be moved
is rotatably connected to. This rotatable blade 34 constitutes a disconnector with a grounding mechanism 16b. The vacuum interrupter 15b is connected to the insulating rod 4
6, is connected to the operating device 44 via a pressure contact spring 47, an operating shaft 48, a cutoff spring 49, and the like.

Next, the vacuum switch C will be explained based on FIG. 5. Since the vacuum switch C is only partially different from the vacuum switches A and B, only the different parts will be explained. A fixed conductor 50 is connected to the fixed lead rod of the vacuum interrupter 15c, and the fixed conductors 50 and 5
A power fuse 18 is detachably installed between the power fuse 1 and the power fuse 18. The fixed side conductor 51 is a bushing 52
A grounding blade 29 is rotatably connected to a grounding terminal 53 inside the housing 25 through the grounding terminal 53, and is rotatably provided near the grounding terminal 53 to be operated by an operating device 44. Housings 23 and 2 excluding power fuse 18
5 constitutes a vacuum switch C.

D Problems to be Solved by the Invention However, since the movable conductor 32 is supported by the insulating frame 26 at only one place, it may vibrate due to electromagnetic force. 31, which may cause sparks.

Therefore, an object of the present invention is to provide a vacuum switch that solves this problem.

E. Means for Solving the Problems In order to achieve the above object, the vacuum switch of the present invention is configured as follows.

L with integrated lower frame and side frame
A movable conductor whose one end side faces the lower frame is coupled to the upper part of the letter-shaped insulating frame, and a vacuum interrupter is disposed between the lower frame and one end of the movable conductor. Then, while the fixed lead rod of the vacuum interrupter is fixed to the lower frame, a hole is formed in the movable conductor, and the movable lead rod is slidably inserted into the hole via a contact.

One end of the movable conductor that supports the movable lead rod of the vacuum interrupter is not supported and lacks strength, so one end and the lower part of the movable conductor are connected via an insulating reinforcing member parallel to the axis of the vacuum interrupter. Connect with the frame. Then, a fixed conductor is connected to the fixed lead rod.

F Effect Since one end of the movable side conductor and the lower frame are connected by the reinforcing member, the movable side conductor is connected at two places, the side frame and the reinforcing member, and the strength of the movable side conductor is reduced. does not vibrate more greatly than before due to electromagnetic force.

G. Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In this embodiment, only the vicinity of the attachment part of the vacuum interrupter in the vacuum switch will be described.

As shown in FIGS. 1 and 2, a three-phase vacuum interrupter 56 is installed inside the housing 55, but since the mounting structure is the same, only one phase will be described.

As shown in the figure, an insulating frame 59 in which a lower frame 57 and a side frame 58 are integrated connects the side frame 58 to the housing 55 via bolts 60, and a reinforcing member welded to the housing 55. 6
2 to the lower frame 57 via bolts 61, and is attached to the housing 55. A central portion of a movable conductor 63 extending in the horizontal direction is coupled to the upper part of the side frame 58 via two bolts 64 . A vacuum interrupter 56 is disposed between one end of the movable conductor 63 and the lower conductor 57, and connects the fixed lead rod 65 to the lower frame 57 and forms a movable lead rod 66 on the movable conductor 63. It is inserted into the hole 67 via a ring contact 79 as a contact. In this embodiment, a coil 68 for applying a vertical magnetic field is provided on the outer periphery of the vacuum interrupter 56, and an embedded metal fitting 69 and a coil 68 are embedded in the lower frame 57.
A bolt 70 passing through the inner end of the coil 68 is screwed into the fixed lead rod 65, and a spring pin 77 is inserted between the inner end of the coil 68 and the fixed lead rod 65.
is typed in. The outer end of the coil 68 is coupled to a fixed conductor 72 embedded in a bushing 71 via a bolt 73. An insulating reinforcing member 74 extending in the axial direction of the vacuum interrupter 56 is interposed between the inner coil and the outer coil of the coil 68, and its upper end is coupled to the movable conductor 63 via a bolt 75. A lower end is connected to the lower frame 57 via a bolt 76. The inner coil and outer coil of the coil 68 and the reinforcing member 74 are coupled via a caulking pin 78. An insulating member is interposed between the caulking pin 78, the inner and outer coils of the coil 68, and the reinforcing member 74. The movable lead rod 66 is attached to the housing 55 as in the conventional case.
It is connected to an operating device (not shown) located above the .

In such a vacuum switch, one end of the movable conductor 63 and the lower frame 57 are connected via the reinforcing member 74, so the movable conductor 63 is supported at two locations on both sides of the movable lead rod 66. become,
It does not vibrate due to electromagnetic force, etc.

In addition, the vacuum interrupter 56 is connected to the insulating frame 5.
When installing the insulation frame 59 together with the vacuum interrupter 56 into the housing 55 after the vacuum interrupter 56 and the movable conductor 63 have been attached to the housing 55, the insulation frame 59 cannot be connected to the housing 55 even if the axes of the vacuum interrupter 56 and the movable conductor 63 are aligned. There will be no misalignment of the axis when doing so.

On the other hand, since the reinforcing member 74 is interposed between the inner coil and the outer coil of the coil 68 and these are coupled by the caulking pin 78, the coil 68 is prevented from opening due to electromagnetic force, and the coil 68 is prevented from opening due to electromagnetic force. Runout is prevented.

E. Effects of the invention As explained above, according to the invention, the end of the movable conductor and the lower frame are connected via an insulating reinforcing member, so that vibrations due to electromagnetic force applied to the movable conductor The vacuum interrupter is reliably fixed to the insulating frame.

[Brief explanation of the drawing]

Figures 1 and 2 relate to an embodiment of the vacuum switch according to the present invention, and Figure 1 is a structural diagram of the vacuum switch, and Figure 2 is a structural diagram of the vacuum switch.
The figure is a view from the - arrow in Figure 1, Figure 3 is a circuit diagram of the switchgear, Figures 4 to 7 relate to a conventional vacuum switch, Figure 4 is a structural diagram of the switchgear, and Figure 5 is a diagram of the switchgear. is a view in the direction of the - arrow in FIG. 4, FIG. 6 is a view in the direction of the - arrow in FIG. 4, and FIG. 7 is an enlarged view of FIG. 56... Vacuum interrupter, 57... Lower frame, 58... Side frame, 59... Insulating frame, 63... Movable side conductor, 65... Fixed lead bar, 66... Movable lead bar, 68... Ring Contact, 72... fixed side conductor, 74... reinforcing member.

Claims (1)

[Scope of utility model registration request] L with integrated lower frame and side frame
A movable conductor, one end of which faces the lower frame, is coupled to the upper part of a letter-shaped insulating frame, and a vacuum interrupter is disposed between the lower frame and one end of the movable conductor, and a fixed lead of the vacuum interrupter is disposed. The rod is fixed to the lower frame, while the movable lead rod is slidably passed through the movable conductor via a contact, and is inserted into the movable conductor through an insulating reinforcing member substantially parallel to the axis of the vacuum interrupter. A vacuum switch characterized in that one end of a movable conductor is connected to the lower frame, and a fixed conductor is connected to the fixed lead rod.