JPH0545047Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a closed power distribution board with an improved arrangement of 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. By arranging the instrument transformer at the rear, and providing a lid below the instrument transformer that can be opened and closed after moving toward the rear of the housing and then moving downward, and a power fuse being detachably installed inside the lid. In addition to reducing the size of the closed switchboard, it also made power fuse replacement and maintenance inspection safer and easier.

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 houses the shield 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 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 upper part of the load bus room, and the instrument transformer is placed at the rear of the upper part of the load bus room. At the same time, the fixed terminals connected to the voltage transformer and the fixed terminals connected to the load bus in the load bus room are placed facing toward the rear of the housing, and are placed on the rear panel of the housing located below the voltage transformer. A pair of rails that form a notch, extend toward the inside of the housing, and have a recess near the middle part are fixed to the housing and provided at the bottom of the notch, and are fixed to the housing above each rail to provide a guide. In addition to providing a plate, a guide hole is formed in the guide plate that is parallel to the rail and whose rear end extends downward along the circumference around the concave portion, while an insulator is provided inside the lid that closes the notch from the outside of the housing. A power fuse is provided removably through the power fuse, and a pair of movable terminals are provided at both ends of the power fuse to be removably connected to a fixed terminal, and a pair of frames located on both sides of the insulator are fixed to both inside sides of the lid. Wheels are provided at the front and rear of each frame, the distance between the axes being larger than the distance between the rear end of the rail and the recess, and a guide rod fixed to the outside of each frame is loosely fitted into each guide hole. shall be.

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 pull the lid located at the rear of the housing to the rear. Then, the wheels roll on the rails and the guide rod moves along the guide hole. That is, the lid moves toward the rear of the housing parallel to the horizontal line, the front wheels fit into the recesses of the rails, and at the same time the rear wheels come off the rails and the lid rotates downward. Therefore, when the lid moves horizontally, the movable terminal comes off from the fixed terminal, and the power fuse is then exposed at the rear of the housing. After this, the power fuse that was disconnected from the circuit is replaced and the lid is pushed in. The lid moves in the reverse order as described above, and the movable electrode is connected to the fixed electrode.

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 fourth figure.
The configuration diagram is shown in FIG. As shown,
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 bogie room 4 shown in FIG. 9 has been deleted, and the power supply bus room 6 has been removed.
The volume of the load bus chamber 7 is 1/2 that of the conventional one.

The VT 16 is arranged above the rear part of the load bus chamber 7, and the PF 17 is arranged below the VT 16. VT16 is fixed to the ceiling of housing 1,
Fixed terminal 26 fixed to partition wall 5 via insulator 25
connected to a. On the other hand, below the fixed terminal 26a is a fixed terminal 26b connected to the load bus 10.
is provided. These fixed terminals 26a, 2
The tip of the terminal 6b faces toward the rear of the closed switchboard, and a PF 17 is detachably provided between the fixed terminals 26a and 26b.

Next, the mounting structure of the PF 17 will be explained based on FIGS. 1 to 3.

As shown in FIG. 1, a notch 27 is formed in the rear plate of the casing 1 located below the VT 16, and a pair of rails 28 extending toward the inside of the casing 1 are provided on both sides of the lower part of the notch 27. It is fixedly provided inside (see Figure 3). 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 and whose rear end extends downward along a circumference centered on the recess 29 .

On the other hand, a PF 17 is removably provided on the inside of a lid 31 that closes the notch 27 from the outside of the housing 1 via an insulator 32, and at both ends of the PF 17, a PF 17 is provided for removably connecting to the fixed terminals 26a and 26b. A pair of movable terminals 33a, 33b having a recess 34 in
is provided. As shown in Figure 2, PF1
Similarly to the VT 16 and the load bus 10, the terminals 7 are arranged for three phases. A pair of frames 35 are fixedly provided inside the 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 such that the front wheel 36 is in the recess 2
9, when entering the rear wheel 3 from the rear end of the rail 28.
The distance L 2 between the recess 29 of the rail 28 and the rear end is set to be larger than the distance L ₂ so that the rail 7 can be removed. As shown in FIG. 3, a guide rod 38 is provided above the front wheel 36 and projects outward from each frame 35, and the guide rod 38 is loosely fitted into each guide hole 30. In addition, as shown in FIG. 2, a pair of handles 39 are attached to the outer surface of the lid 31, and a set screw 40 (see FIG. 1) for fixing the lid 31 to the housing 1 passes through the lid 31. and housing 1
is screwed into.

Incidentally, reference numerals 42 to 44 in FIG. 5 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 are capable of opening and closing upwardly 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 lid 31 to the right in FIG. Pull to the right. Then, as the guide rod 38 moves along the guide hole 30, the front wheel 36 and the rear wheel 37 roll on the rail 28, and when the front wheel 36 fits into the recess 29, the guide rod 38 moves in an arc along the guide hole 30. At the same time as the rail 28 moves downward, the rear wheel 37 comes off the rear end of the rail 28 and descends. Therefore, the movable terminals 33a, 3
3b moves to the right in FIG.
a, 26b, and then exposed to the rear of the housing 1.

Therefore, after replacing the PF 17 attached to the lid 31, if you grasp the handle 39, lift the lid 31, and push it into the housing 1, the operations will be performed in the reverse order, and the recesses 34 of the movable terminals 33a, 33b will Fixed terminals 26a and 26b are fitted. Once the new PF 17 has been set in this manner, the setscrew 40 can be tightened again.

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 approximately 1/2 of the size of the conventional one. . In addition, a lid is provided below the instrument transformer that can be opened and closed by moving toward the rear of the housing and then moving downward, and a power fuse is installed inside the lid so that it can be attached and removed, making it easy to disconnect electrical connections. Later, the power fuse can be exposed to the outside of the housing, allowing safe and easy replacement and maintenance of the power fuse.

[Brief explanation of the drawing]

1 to 5 relate to an embodiment of the closed switchboard according to the present invention, in which FIG. 1 is a configuration diagram showing the main parts, FIG. 2 is a plan view of the lid, and FIG. 3 is a partial detailed view of the lid. Figure 4 is a single line diagram of the main circuit, Figure 5 is a configuration diagram of a closed switchboard,
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 disconnect room, 6...Power bus room, 7...Load bus room, 10...Load bus, 1
6...Instrument transformer, 17...Power fuse,
26a, 26b... Fixed terminal, 27... Notch,
28...Rail, 29...Recess, 30...Guide hole, 31...Lid, 32...Insulator, 33a, 33b
...Movable terminal, 35...Frame, 36...Front wheel, 37...Rear wheel, 38...Guide rod, 41...
guide board.

Claims (1)

[Scope of Claim for Utility Model Registration] In a closed power distribution board 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. In addition to placing the potential transformer at the rear, the fixed terminals connected to the potential transformer and the fixed terminals connected to the load bus in the load bus room are placed facing toward the rear of the chassis, and the fixed terminals connected to the potential transformer are placed below the potential transformer. A notch is formed in the rear plate of the housing located at
A pair of rails extending toward the inside of the housing and having a recess near the middle part are fixed to the housing and provided at the bottom of the notch, and a guide plate is provided above each rail and fixed to the housing. A guide hole is formed in the guide plate that is parallel and whose rear end extends downward along the circumference around the recess, while a power fuse is inserted through an insulator inside the lid that closes the notch from the outside of the housing. A pair of movable terminals are provided at both ends of the power fuse to be detachably connected to a fixed terminal, and a pair of frames located on both sides of the insulator are fixed to both sides inside the lid.
Wheels are provided at the front and rear of each frame, the distance between the axes being larger than the distance between the rear end of the rail and the recess, and a guide rod fixed to the outside of each frame is loosely fitted into each guide hole. Closed switchboard.