JP7528692B2 - Operating mechanism of solid insulated switchgear - Google Patents

Description

The present invention relates to an operating mechanism for a solid insulated switchgear.

In a solid insulated switchgear insulating the vacuum interrupter and main circuit conductors with a mold, a conversion lever is connected to the movable lead of the vacuum interrupter, and the on/off operating direction of the operating mechanism is changed by 90 degrees by the conversion lever (for example, Patent Document 1). An insulating rod is connected to the conversion lever, and when the operating mechanism connected to this insulating rod is operated, the vacuum interrupter is turned on and off.

When the vacuum interrupter is made smaller, the molded insulating structure is also made smaller, but it becomes impossible to place a conversion lever. Therefore, if the vacuum interrupter is placed horizontally, it can be operated from an insulating rod without the need for a conversion lever (for example, Patent Document 2).

Japanese Patent Application Publication No. 7-320609 JP 2019-96447 A

Placing the vacuum interrupter horizontally allows the height of the solid-insulated switchgear housing to be lowered, but this requires the operating mechanism to be made smaller. Since the housing is also limited in size in the depth direction, it may not be possible to place the operating mechanism.

When the operating mechanism is attached to a mounting plate and a current transformer is attached to the back of this mounting plate, wiring space for the current transformer is required, and it may not be possible to use the entire depth of the housing of the solid-insulated switchgear.

The interlock wiring that is connected to the electrical components is laid along the inner surface of the housing, but since there is not enough space to place the bundled wires, they are individually arranged side by side on the inner surface.

Furthermore, the dimensions of the lever of the operating shaft of the solid-insulated switchgear differ between the vacuum interrupter side and the operating mechanism side, and are determined based on the stroke of the vacuum interrupter and the operating force of the operating mechanism.

Conventional operating mechanisms have large installation dimensions in the depth direction of the device, which can make installation impossible. Also, if the lever ratio is set to a small value and the mechanism is positioned such that it is directly subjected to the operating force of the solid-insulated switchgear, the strength of the operating mechanism must be increased. Furthermore, during operation, the load increases at the installation position of the operating mechanism and the hook engagement position, which can cause the operating mechanism to deflect when the solid-insulated switchgear is in operation.

As described above, solid insulated switchgear requires miniaturization, and the operating mechanism also needs to be miniaturized to facilitate assembly inside the device and ensure wiring space.

In view of the above circumstances, the present invention aims to miniaturize solid insulated switchgear and its operating mechanism.

Therefore, one aspect of the present invention is an operating mechanism for a solid-insulated switchgear equipped with a vacuum interrupter, which has a mounting plate on which the closing coil, closing hook, closing lever, and release hook of the vacuum interrupter are provided, the closing coil is disposed on the front side of the mounting plate, and the closing lever is disposed on the front side between the closing coil and the closing hook.

In one aspect of the present invention, in the operating mechanism, an operating shaft for the vacuum interrupter is disposed on the rear side of the mounting plate that faces the insulating rod of the vacuum interrupter.

In one aspect of the present invention, a tripping coil is further disposed on the front side of the mounting plate, and is connected to a conversion lever connected to the insulating rod.

According to the present invention, the solid insulated switchgear and its operating mechanism can be made smaller.

FIG. 2 is a longitudinal sectional view of an operating mechanism of a solid insulated switchgear according to one embodiment of the present invention. FIG. FIG. 4A is a side view of the operating mechanism, and FIG. 4B is a front view of a closing coil of the operating mechanism. 3A is a side view of the tripping coil of the operating mechanism, and FIG. 3B is a plan view of the tripping coil.

The following describes an embodiment of the present invention with reference to the drawings.

The operating mechanism 3 of the solid insulated switchgear 1 equipped with the vacuum interrupter 2, which is one embodiment of the present invention illustrated in Figures 1 to 3, has a mounting plate 9 on which the closing coil 4, closing hook 5, closing lever 6, tripping coil 7, and tripping hook 8 of the vacuum interrupter 2 are mounted. The operating mechanism 3 is stored in a movable box-shaped operating unit 10, as illustrated in Figure 1.

The closing coil 4, closing hook 5, closing lever 6, tripping coil 7 and tripping hook 8 are arranged on the front 91 side of the mounting plate 9, near the insulating rod 21 of the vacuum interrupter 2.

The closing lever 6 is supported by a pair of support plates 93 on the front surface 91 side of the mounting plate 9 so that it is positioned between the closing coil 4 and the closing hook 5.

The tripping coil 7 is disposed on one of the pair of support plates 93 on the front surface 91 side of the mounting plate 9, and is connected to the tripping hook 8. The operating shaft 40 of the vacuum interrupter 2 is disposed on the back surface 92 side.

As shown in FIG. 4, the conversion fitting 70 of the tripping coil 7 has a connecting portion 71 that is connected to the tripping hook 8, a coil frame 72 equipped with this connecting portion 71, a movable plate 74 that is movably attached to the coil frame 72 by a movable shaft 73, and a pin bolt 75 that fixes the movable plate 74 to the coil frame 72. A long hole 76 through which the pin bolt 75 is inserted is formed in the movable plate 74 along the longitudinal direction of the coil frame 72.

An example of the basic operation of the operating mechanism 3 will be described with reference to Figures 1 to 4.

When the rotation of the motor 31 of the operation mechanism 3 shown in Figures 2 and 3 is transmitted to the reduction mechanism 32, the rotation speed of the motor 31 is reduced. When the ratchet wheel 34 is pushed by the energy-storing claw 33 connected to the reduction mechanism 32 in Figure 3, the ratchet wheel axle 35 rotates, and the closing spring 36 connected to this ratchet wheel axle 35 is charged. When the closing spring 36 reaches the fully charged position, the roller follower 37 attached to the ratchet wheel axle 35 engages with the closing hook 5 and stops at that position. When the closing coil 4 operates in this state, the axis of the closing coil 4 pushes the closing lever 6, which rotates and presses the closing hook 5. At this time, the engagement between the closing hook 5 and the roller follower 37 is released, and the ratchet wheel axle 35 rotates due to the force of the closing spring 36. When the ratchet wheel axle 35 rotates, the closing cam 38 attached to the ratchet wheel axle 35 rotates. As a result, the operating shaft 40 rotates in one direction by rotating the operating side spindle lever 41 shown in Figure 1. As a result, the conversion lever 23 connected to the insulating rod side spindle lever 42 is pushed, which in turn pushes the insulating rod 21 connected to the conversion lever 23, and the movable lead 22 of the vacuum interrupter 2 connected to the insulating rod 21, and the vacuum interrupter 2 enters the closed state. At this time, the roller follower 37 and the pull-out hook 8 shown in Figure 3 attached to the operating side spindle lever 41 and the insulating rod side spindle lever 42 engage with each other, and the vacuum interrupter 2 is maintained in the closed state.

On the other hand, when the tripping coil 7 operates in the closed state, the shaft of the tripping coil 7 pushes the tripping hook 8, disengaging the tripping hook 8 from the roller follower 37, and the operating shaft 40 rotates in the other direction due to the breaking spring force. This causes the insulating rod 21 connected to the insulating rod side main shaft lever 42 via the conversion lever 23 to be pulled, and the movable lead 22 of the vacuum interrupter 2 connected to this insulating rod 21 is pulled, causing the vacuum interrupter 2 to enter a cut-off state.

Next, the effect of the operating mechanism 3 of this embodiment will be explained.

In conventional operating mechanisms, the closing coil and the tripping coil are located on the front surface 91 of the mounting plate 9, and the closing hook and the tripping hook are directly operated by the closing coil and the tripping coil, so the size of the operating mechanism is large in the depth direction.

In contrast, in the present embodiment, the operating mechanism 3 has the closing coil 4 and the release coil 7 arranged on the front surface 91 of the mounting plate 9, and the closing lever 6 arranged between the closing coil 4 and the closing hook 5, which allows the solid insulated switchgear 1 and its operating mechanism 3 to be made smaller.

In addition, the tripping coil 7 is positioned so that the distance between it and the conversion lever 23 of the vacuum interrupter 2 can be adjusted and it can be connected to the conversion lever 23, making it easy to adjust the gap between the tripping hook 8 and the vacuum interrupter 2.

Furthermore, in the tripping coil 7 shown in FIG. 4, the movable shaft 73 and movable plate 74 increase friction within the coil frame 72, increasing the operating force, but by attaching a pin bolt 75 to the movable plate 74, it is possible to prevent an increase in the operating force of the tripping hook 8.

In addition, the closing lever 6, which is located between the closing coil 4 and the closing hook 5, functions as the operating button of the operating mechanism 3, allowing the closing hook 5 to be manually operated, eliminating the need for parts such as the manual push button that was previously installed.

Furthermore, since the closing coil 4 is operated by the closing hook 5 via the closing lever 6, the operating force of the closing coil 4 can be reduced, and the operating mechanism 3 can be made smaller.

The closing coil 4, closing hook 5, closing lever 6, and pull-out hook 8 of the operating mechanism 3 are arranged on the front surface 91 of the mounting plate 9, and the operating shaft 40 of the vacuum interrupter 2 is arranged on the back surface 92 of the mounting plate 9, so that space for wiring can be secured. Furthermore, the lever ratio of the operating side spindle lever 41 and the insulating rod side spindle lever 42 can be easily optimized.

1...Solid insulated switchgear 2...Vacuum interrupter, 21...Insulating rod, 22...Movable lead 3...Operation mechanism 4...Making coil 5...Making hook 6...Making lever 7...Trip coil, 70...Conversion metal fitting, 71...Connecting part, 72...Coil frame, 73...Movable shaft, 74...Movable plate, 75...Pin bolt, 76...Elongated hole 8...Trip hook 9...Mounting plate, 91...Front, 92...Rear, 93...Support plate 10...Operation part 40...Operation shaft, 41...Operation side main shaft lever, 42...Insulating rod side main shaft lever 31...Motor, 32...Reduction mechanism, 33...Energy storage claw, 34...Ratchet wheel, 35...Ratchet wheel axle, 36...Making spring, 37...Roller follower, 38...Making cam

Claims (1)

An operating mechanism for a solid insulated switchgear having a vacuum interrupter, comprising:
a mounting plate on which a closing coil, a closing hook, a closing lever and a release hook of the vacuum interrupter are provided;
the closing coil , the closing hook, the closing lever, and the tripping hook are disposed on a front side of the mounting plate,
the closing lever is disposed on the front side between the closing coil and the closing hook, and the closing coil pushes and operates the closing hook via the closing lever to close the vacuum interrupter ;
an operating shaft of the vacuum interrupter is disposed on a rear side of the mounting plate opposite the insulating rod of the vacuum interrupter;
a tripping coil that can cut off the vacuum interrupter by pushing the tripping hook is further disposed on the front side of the mounting plate.

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