JPH0545046Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a closed power distribution board with improvements regarding a voltage transformer and a power fuse.

B. Overview of the invention This invention provides a closed switchboard with a sheath disconnection chamber at the front of the interior of the casing, a load bus chamber at the rear, and a power supply bus chamber at the front of the upper part of the load bus chamber. An instrument transformer is placed at the rear to provide a first cover, while a second cover is provided below the first cover and a power fuse is provided inside the second cover. By installing an interlock mechanism that prevents the power from opening, the size of the closed switchboard can be reduced, and work safety is ensured by ensuring that the first cover does not open until after the second cover has opened and the voltage transformer has been disconnected. This is what we have ensured.

C. Prior Art A main circuit single line diagram of a conventional closed switchboard is shown in FIG. 6, a front view is shown in FIG. 7, a view taken from the - arrow in FIG. 7 is shown in FIG. 9th view
As shown in the figure. The lower part in FIG. 6 which is a plan view will be described as the front part of the closed switchboard, and the upper part as the rear part.

The inside of the housing 1 is partitioned by a partition wall 2 into a front chamber and a rear chamber, and the front chamber is partitioned by a partition wall (not shown) into a breaker chamber 3 on the left side and a bogie chamber 4 on the right side. On the other hand, the rear chamber is partitioned by a partition wall 5 into a power bus chamber 6 and a load bus chamber 7 located above the front portion. The three-phase power bus 8 introduced into the power bus room 6 is connected to a disconnecting section 9 provided on the partition wall 2, and is connected to a load (not shown), as well as the three-phase load introduced into the load bus room 7. A bus bar 10 is connected to a disconnection section 11 provided on the partition wall 2. A pull-out type disconnector 12 that is detachably connected to the disconnecting sections 9 and 11 is provided in the disconnector chamber 3. A grounding device 13 for grounding the load bus 10 is provided in the load bus chamber 7 .

Inside the bogie chamber 4, a disconnection section 1 provided on the partition wall 2 is provided.
The pull-out trolley 1 can be detachably attached to the load bus 10 via 4.
5, and a voltage transformer (hereinafter simply referred to as VT) 16 and a power fuse (hereinafter simply referred to as PF) 17 are mounted on the pull-out cart 15.
That is, the VT 16 is detachably connected to the load bus 10 via the PF 17. This VT16 is
It is used for purposes such as measuring circuit voltage using a combination of meters and relays, detecting over/under voltage, and detecting ground faults. In addition, as shown in FIG.
A VT 16 is provided in the transformer room 19, and the VT 16 is connected to the disconnect section 20 provided in the bulkhead 2, and the pull-out cart 15 carrying the PF 17 is connected to the disconnect section 1.
4 and 20 may be configured to be detachable.

Since the PF17 is mounted on the pull-out trolley 15 in this way, if the PF17 melts, the pull-out trolley 15
The PF 17 can be carried out to the outside of the truck room 4, and the PF 17 can be replaced safely and easily.

D. Problems to be solved by the invention However, since the shield disconnector chamber 3 that stores the disconnector 12 and the trolley chamber 4 that stores the drawer trolley 15 are arranged side by side, the closed switchboard cannot be moved from side to side. There is a problem in that it is large and requires a lot of installation space.

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

E Means for solving the problem The structure of the present invention to achieve this purpose is as follows:
In a closed power distribution board, a power supply bus room is provided at the front of the top of the load bus room, and a power bus room is provided at the front of the upper part of the load bus room.The instrument transformer is placed above the load bus room. At the same time, a first cover is provided behind the instrument transformer, and a first fixed terminal connected to the instrument transformer is arranged below the instrument transformer. A second fixed terminal connected to the load bus bar is arranged, a second cover is provided below the first cover that opens toward the outside of the housing, and a power fuse is detachably provided inside the second cover via an insulator. , the first fixed terminal and the second fixed terminal are provided with first and second movable terminals that can be attached or detached at both ends of the power fuse, and the bent part of the dogleg-shaped lever is rotatable near the second lid inside the housing. The lower end of the lever is rotatably connected to the inside of the second lid while the lower end of the rod supported vertically within the housing is rotatably connected to the upper end of the lever. It is characterized in that a hole is formed in the latch integrally fixed to the inside of the first lid, and the upper end of the rod is inserted into the hole.

F Effects Since the instrument transformer and power fuse are placed above the load bus room, there is no need for a trolley room or a pull-out trolley, and as a result, the closed switchboard becomes smaller in the left and right direction, making it more compact than before. .

If the power fuse blows out, simply open the second cover to the rear of the housing and replace the power fuse, and when performing maintenance or inspection on the instrument transformer, open the second cover to the rear to disconnect the instrument transformer. You will have to open the first lid later. That is, if the second cover is not opened, the first cover cannot be opened due to the interlock mechanism, and the danger of touching the voltage transformer in an undisconnected state is inevitably avoided.

G. Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. Note that the same parts as those of the conventional closed switchboard are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be explained.

The main circuit single-line diagram of the closed switchboard according to the present invention is shown in the second figure.
The configuration is shown in FIG. 2b, and the configuration diagram is shown in FIG. As shown in the figure, when comparing the closed switchboard according to the present invention with the conventional one, the right half of the closed switchboard shown in FIG. 7 has been removed, and the volume is about half that of the conventional one. In other words, the truck chamber 4 shown in FIG. 9 is removed, and the volumes of the power bus chamber 6 and load bus chamber 7 are halved compared to the conventional one.

As shown in FIG. 2b, the VT 16 is attached to the rear ceiling of the load busbar room 7, and a first fixed terminal 26a connected to the VT 16 is attached below the VT 16 via an insulator 25. A second fixed terminal 26b connected to the load bus bar 10 is provided below the first fixed terminal 26a. The tips of the first and second fixed terminals 26a and 26b face toward the rear of the housing 1, and a PF 17 is detachably provided between the first and second fixed terminals 26a and 26b. A first lid 57 that opens toward the outside of the housing 1 is provided at the rear of the VT 16 so as to be rotatable via a hinge 58, as shown in FIG. 1, and a handle 59 is provided on the outside of the first lid 57. It is provided.

Next, the mounting structure of the PF 17 will be explained based on FIGS. 3 to 5.

As shown in FIG. 3, a notch 27 is formed in the rear plate of the housing 1 located below the VT 16, and a pair of rails 28 extending toward the inside of the housing 1 are provided on both sides of the lower part of the notch 27. It is fixedly provided inside (see Figure 5). Each rail 28
Arc-shaped recesses 29 are formed near the intermediate portions of each. A guide plate 41 is provided above each rail 28 and fixed to the housing 1, as shown in FIG.
A guide hole 30 is formed parallel to the guide hole 30 whose rear end extends downward along a circumference centered on the recess 29 .

On the other hand, a PF 17 is removably provided inside a second lid 31 that closes the notch 27 from the outside of the housing 1 via an insulator 32, and the first and second fixed terminals 26a, 26b are provided at both ends of the PF 17. A pair of first and second movable terminals 33a, 33b each having a recess 34 is provided for detachably connecting with the terminal. As shown in FIG. 4, the PF 17 is arranged for three phases in the same way as the VT 16 and the load bus 10. A pair of frames 35 are fixedly provided inside the second lid 31 on both sides of the three-phase insulator 32, and a front wheel 36 and a rear wheel 37 are provided at the outer lower part of each frame 35. The center distance L ₁ between the front wheel 36 and the rear wheel 37 is set such that the rear wheel 37 comes off from the rear end of the rail 28 when the front wheel 36 enters the recess 29 .
The distance L 2 between the recess 29 of the rail 28 and the rear end is set larger than the distance L ₂ . Above the front wheel 36,
As shown in FIG. 5, a guide rod 38 is provided to protrude outward from each frame 35.
8 is loosely fitted into each guide hole 30. In addition, as shown in FIG. 4, a pair of handles 39 are attached to the outer surface of the second lid 31, and a set screw 40 (see FIG. 3) for fixing the second lid 31 to the housing 1 is attached. It penetrates the second lid 31 and is screwed into the housing 1.

Next, based on FIG.
5 will be explained. Inside the second lid 31, a bent part of a dogleg-shaped lever 47 is attached to a shaft 4 fixed to the housing 1.
The lever 47 is rotatably supported around the lever 47.
The lower end of the second lid 31 is connected to either the left or right side of the second lid 31 . That is, one end of the auxiliary member 48 is coupled to the inner surface of the second lid 31, and a long hole 49 is formed along the longitudinal direction of the second lid 31.
The lower end of the lever 47 and a retainer 50 are connected to both ends of the pin 60 inserted into the lever 47 . On the other hand, inside the first lid 57, there is a rod 51 extending vertically.
is supported in a vertically movable manner via a support member 52 fixed to the housing 1, and a pin 53 connected to the lower end of the rod 51 is loosely fitted into an elongated hole 54 formed at the upper end of the lever 47. The upper end of the rod 51 is inserted into a hole 56 of a latch 55 fixed to the inside of the first lid 57.

Incidentally, reference numerals 42 to 44 in FIG. 2 are pressure relief plates that release gas into the atmosphere in the event of an arc accident to prevent the accident from spreading due to an increase in internal pressure, and can be opened and closed upward in the figure.

Next, the operation of such a closed switchboard will be explained.

As mentioned above, since the VT 16 and the PF 17 are arranged above the rear part of the load bus chamber 7, the volume of the closed switchboard is reduced to about 1/2 of that of the conventional one.

If the PF 17 is fused, remove the set screw 40, grasp the handle 39, pull the second lid 31 to the right in FIG. Pull further to the right.
Then, the guide rod 38 moves along the guide hole 30 and at the same time the front wheels 36 and rear wheels 37 move along the rail 28.
When the front wheel 36 is fitted into the recess 29, the guide rod 38 moves downward in an arc along the guide hole 30, and at the same time, the rear wheel 37 comes off the rear end of the rail 28 and descends. Therefore, the first and second movable terminals 33a and 33b move to the right in FIG. 3 and separate from the first and second fixed terminals 26a and 26b,
Thereafter, the PF 17 will be exposed to the rear of the housing 1.

Therefore, PF1 attached to the second lid 31
After replacing 7, hold the handle 39 and remove the second lid 31.
If you lift it and push it into the housing 1, it will operate in the reverse order as described above, and the first and second movable terminals 33a, 33
The first and second fixed terminals 26a, 26 are placed in the recess 34 of b.
b fits in. In this way, the new PF17
Once set, just tighten the setscrew 40 again.

Next, for maintenance and inspection of VT16, first lid 5
The case where 7 is opened and closed will be explained.

In this case, if the second lid 31 is not open, the first
As shown in the figure, the first lid 57 is interlocked by the rod 51, and the first lid 57 cannot be opened. As can be seen from the above, this means that the second lid 31 is not open and the VT16
If the first lid 57 is not disconnected, the first lid 57 will not open, which means that danger will inevitably be avoided.
When the second lid 31 is opened, the lower end of the lever 47 comes out of the housing 1, causing the lever 47 to rotate counterclockwise in FIG.
As it descends, it comes out of the hole 56, the interlock is released, and the first lid 57 can be opened. When the first lid 57 is open, the second lid 3
1 is open and VT16 is disconnected, so VT
16 maintenance inspections can be performed safely.

Even if an attempt is made to close the second lid 31 and the first lid 57 after the maintenance and inspection is completed, the rod 51 obstructs the closing and the second lid 31 is closed after the first lid 57 is closed. Then, the lower end of the lever 47 is pushed by the auxiliary member 48 and rotates clockwise, so the upper end of the lever 47 pushes up the rod 51, and the rod 51 is inserted into the hole 56 to open the first lid 5.
7 is interlocked.

H. Effects of the invention As explained above, according to the closed switchboard according to the present invention, the instrument transformer and power fuse are placed at the rear of the upper part of the load bus chamber, so the closed switchboard can be reduced to about half the size of the conventional one. . In addition, since a second cover is provided that can be opened and closed, if the power fuse blows out, the second cover can be opened to easily replace the power fuse. Maintenance and inspection of the instrument transformer can also be carried out using the first cover. It can be opened and operated easily.

Furthermore, since the device has an interlock mechanism which prevents the first cover from being opened unless the second cover is opened and the potential transformer is disconnected, the risk of touching the potential transformer when it is not disconnected is reliably avoided, resulting in the remarkable effect of ensuring safety.

[Brief explanation of the drawing]

Figures 1 to 5 relate to an embodiment of the closed switchboard according to the present invention, where Figure 1 is a configuration diagram showing the interlock mechanism, Figure 2a is a main circuit single line diagram, and Figure 2b is the configuration of the closed switchboard. Figure 3 is a configuration diagram showing the main parts,
Fig. 4 is a plan view of the lid, Fig. 5 is a partial detailed view of the lid,
6 to 10 relate to a conventional closed switchboard, FIG. 6 is a main circuit single line diagram, FIG. 7 is a front view, FIG. Figure -
Fig. 10 is a - arrow view of Fig. 7 showing another example. 1...Housing, 3...Shipping breaker room, 6...Power bus room, 7...Load bus room, 10...Load bus, 1
6...Instrument transformer, 17...Power fuse,
26a...First fixed terminal, 26b...Second fixed terminal, 31...Second lid, 32...Insulator, 33a...
First movable terminal, 33b... Second movable terminal, 45...
...Interlock mechanism, 46...Shaft, 47...Lever, 51...Rod, 55...Latch, 56...
Hole, 57...first lid.

Claims (1)

[Scope of Claim for Utility Model Registration] In a closed switchboard in which a sheath breaker chamber is provided at the front of the interior of the casing, a load bus chamber is provided at the rear, and a power supply bus chamber is provided at the front of the upper part of the load bus chamber, the upper part of the load bus chamber. An instrument transformer is placed in the instrument transformer, and a first cover is provided behind the instrument transformer, and a first fixed terminal connected to the instrument transformer is arranged below the instrument transformer. A second fixed terminal connected to the load bus in the load busbar chamber is arranged below the housing, and a second lid that opens toward the outside of the housing is provided below the first lid, and an insulator is placed inside the second lid. The power fuse is detachably installed.
The first fixed terminal is detachable from the second fixed terminal,
A second movable terminal is provided at both ends of the power fuse, a bent portion of the dogleg-shaped lever is rotatably supported near the second lid in the housing, and the lower end of the lever is rotatably attached to the second lid. While connected to the inside, the lower end of the rod supported vertically movably within the housing is rotatably connected to the upper end of the lever, and a hole is formed in the latch integrally fixed inside the first lid. A closed switchboard characterized in that the upper end of the rod is inserted into the hole.