JPS6341769Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a closed power distribution board that incorporates a drawer-shaped disconnector and a grounding switch for grounding the load side, and is particularly provided with an interlock operation linked to the grounding switch.

The grounding switch of the closed power distribution board is used to ground the loads during maintenance and inspection of various electrical devices connected to the load side. The interlock conditions between the earthing switch and the shingle breaker are such that when the earthing switch is in a closed circuit state, the shingle breaker cannot be moved into its connection position. In order to satisfy this interlock condition, various types of interlock devices such as mechanical or electrical types are known.
However, the conventional electrical interlock device has the disadvantage that it takes time to inspect and repair when the life of the electronic component has expired or if the electronic component should fail.
In addition, the conventional mechanical interlock device has the disadvantage that, in the case of a large-capacity capacitor, the capacitor is easily destroyed because the impact force when the capacitor is carried in is large. That is, no matter which type of interlock device is used, the reliability of the interlock has conventionally been low.

The purpose of the present invention is to provide an interlock device between the shield breaker and the earthing switch, which has mechanical strength that will not be destroyed by the impact force when carrying a large-capacity shield breaker. The purpose of this project is to provide a closed switchboard. To achieve this objective, the present invention is a sheath breaker, an earthing switch, and an operating rod for opening and closing the earthing switch, which has wheels that roll on the floor of a box. Close the earthing switch by forward movement (move to the left in Figure 1), or return movement (move to the right in Figure 1)
In a closed switchboard equipped with an interlock device that is operated to open the earthing switch by a switch, the interlock device is linked to the operating rod, rotates as the operating rod moves forward, and connects to the wheel of the breaker. A lock lever that protrudes into the path of the wheel so as to come into contact with it or deviates out of the path of the wheel when the operating rod moves back, and a stopper fixed to the floor surface that abuts and supports the lock lever that protrudes into the path of the wheel. It is characterized by having the following.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached FIGS. 1 to 4. FIG.

In order to facilitate understanding of the present invention, the construction of a closed switchboard 1 incorporating an interlock device A will be schematically explained with reference to FIG. Closed switchboard 1
The inside of the box body 2 is divided into a front breaker chamber 3, a power bus chamber 4 at the upper rear, and a load bus chamber 5 at the lower rear. A vertical partition wall 6 is provided between the power supply bus room 4 and the load bus room 5, and a horizontal partition wall 7 is provided between the power supply bus room 4 and the load bus room 5. ing.

A drawer-shaped sheath disconnector 8 is housed in the front part of the sheath disconnector chamber 3 so as to be freely drawn out. The sheath cutter 8 has wheels 9 at its lower part.

Behind the sheath disconnector 8, a pair of disconnecting sections 12 and 13 are fixed to the vertical partition wall 6 in a wall penetrating state. One of the disconnection sections 12 protrudes into both the power disconnection chamber 3 and the power supply bus chamber 4, and the other disconnection section 1
3 protrudes into both the bow breaker chamber 3 and the load busbar chamber 5. A power supply bus 14 is provided in one disconnection section 12.
The terminal portion of the load bus 15 is held within the other disconnecting portion 13 .

In the shield disconnector 8, the pair of disconnectors 1
A pair of rods 16 and 1 that hold a pair of plugs (not shown) that are detachable from the power supply bus 14 and the load bus 15 are disposed opposite to the power supply bus 14 and the load bus 15.
7 is provided in a protruding state at the rear of the cutter 8. The above-mentioned pair of plugs are connected to a pair of electrodes (not shown) of the shield breaker 8.

An earthing switch 18 is attached to a part of the surface of the vertical partition wall 6 facing the load busbar chamber 5 .
This earthing switch 18 has a fixed blade 19 projecting downward at its rear end. The fixed blade 19 and the load bus 15 are connected by a connection bus 10. The earthing switch 18 also has a movable blade 20 that can be inserted into or removed from the fixed blade 19 . This movable blade 20
is rigidly connected to one end of the operating end link 21. The operating end link 21 is rotated by one end of an operating rod 23 extending toward the front side of the box body 2, using a fixed pivot 22 fixed to the earthing switch 18 as a fulcrum. Further, the operating rod 23 is located at a side position of the shear cutter 8, as is clear from FIG.

The movable blade 20 projects vertically downward when the earthing switch 18 is in the open state, and rotates 90 degrees counterclockwise in FIG. 1 until the earthing switch 18 transitions from the open state to the closed state. be done.

The operating rod 23 is horizontally reciprocating and has an L-shaped operating source link 2 at the other end.
4 by a movable pivot 25.
The operating end link 24 is supported at its corner by a fixed pivot 26 located at a fixed position relative to the box body 2. The operation source link 24 is rotated by a manual operation handle 24a, and the earthing switch 1
8 is in the open circuit state, it is in the position shown by the broken line, and when the earthing switch 18 is in the closed circuit state, it is in the position shown by the two-dot chain line.

In the closed switchboard 1 having the above-described structure, the interlock device A is provided in the shield breaker chamber 3 in a state in which it is interlocked with the operating rod 23.

The details of the configuration of interlock device A will be explained below. At approximately the middle of the operating rod 23, the 2
A support plate 28 is rigidly connected to the operating rod 23 by U-bolts and nuts 27. An interlock drive shaft 29 is fixed to the center of the support plate 28 in a downward direction.

As shown in FIG. 3, the lever 30
It is loosely connected to the interlock drive shaft 29 through a long hole 31 on one end thereof, and the upper end of a lock lever rotation shaft 32 is rigidly connected to the other end of the lever 30 by a knock pin 34.

As shown in FIGS. 1 and 4, the lock lever rotation shaft 32 is supported at its lower end by a bearing 33 fixed to the floor surface 2a of the box body 2. As shown in FIGS. A prismatic lock lever 35 is rigidly connected to the lower end of the lock lever rotation shaft 32.

At a position close to the bearing 33, a prismatic stopper 36 is fixed to the floor surface 2a by bolts 37, welding, or the like. The stopper 36 is configured such that when the lock lever 35 is in the lock position (the position where the lock lever 35 is indicated by a solid line in FIG. 3), the wheels 9 of the shear disconnector 8 that is moving to the connection position come into contact with the lock lever 35. When the force is applied to the lock lever 35 from the breaker 8,
This is for abutting and supporting the lock lever 35.

The operation of the interlock device A will be explained below.

In FIG. 1, when the operating handle 24a is in the downward position and the operating rod 23 is at the maximum backward movement position as shown by the solid line, the earthing switch 18 is
Since the movable blade 20 is separated from the fixed blade 19, it is in an open circuit state. In this case, interlock device A is inactive;
The lock lever 35 is in the unlocked position shown by the dashed double-dashed line in FIG. Therefore, the sheath cutter 8 is in a state where it can be carried in and out. In this state, the cable breaker 8 can be freely pulled out to the disconnection position shown by the two-dot chain line (in Figure 1), and can also be freely pulled out to the connection position shown by the solid line (in Figure 1). Can be moved.

On the other hand, in FIG. 1, when the operating handle 24a is in the upper position and the operating rod 23 is at the maximum forward movement position indicated by the two-dot chain line, the earthing switch 1
8 is in a closed circuit state because its movable blade 20 is in contact with the fixed blade 19 as shown by the two-dot chain line. In this case, interlock device A is in operation and lock lever 35
is in the locked position indicated by the solid line in FIG.
Therefore, once the shear cutter 8 is pulled out, its wheels 9 are stopped by the lock lever 35 which is strongly supported by the stopper 36.
It cannot be brought into the connection position.

Due to the action of interlock device A as described above,
The above interlock condition, ie, the condition that when the earthing switch is in the closed circuit state, the breaker cannot be brought into its connection position, is satisfied.

As described above, according to the present invention, when the earthing switch is operated to shift from the open circuit state to the closed circuit state, that is, when the operating rod moves forward, the interlock drive shaft rigidly connected to the operating rod As a result, the lock lever rotates and protrudes into the delivery path of the drawer and disconnector through the lever and the lock lever rotation shaft, thereby preventing the wheels of the disconnector from rotating. Furthermore, even if the lock lever is subjected to a large moment due to the impact force when a large-capacity shield and disconnector is carried in, it is supported by a stopper that is firmly fixed to the floor, so it will not be destroyed and will not be damaged. As a result, the interlock conditions between the shield breaker and the earthing switch are reliably met, allowing safe maintenance and inspection of electrical equipment on the load side. It has practical effects such as being able to perform

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a closed switchboard equipped with an interlock device according to the present invention, Fig. 2 is a plan view of the interlock device, and Fig. 3 is an enlarged plan view of the main parts of the interlock device to explain its operation. , 4th
The figure is an enlarged side view of the main parts of the above-mentioned interlock device.
...Load busbar room, 8...Shin breaker, 9...Wheel, 1
2, 13... Disconnection section, 14... Power bus, 15...
...Load bus bar, 18...Earth switch, 23...Operation rod, 29...Interlock drive shaft, 30...
Lever, 32...Lock lever rotation axis, 35...
Lock lever, 36... Stopper, A... Interlock device.

Claims (1)

[Scope of utility model claims] Power disconnection room 3, power bus room 4 and load bus room 5
A drawer type disconnector 8 that can be taken in and out is connected to a box body 2 consisting of a box 2, and a drawer disconnector 8 is connected to a power bus 14 in a power bus room 4 and a load bus 15 in a load bus room 5, respectively. Disconnecting sections 12 and 13 and the load bus bar 15
The interlock drive shaft 29 is rigidly connected to the operating rod 23 of the earthing switch 18, and is a closed switchboard housing the earthing switch 18 in the earthing circuit.
, a lever 30 rotated by the interlock drive shaft 29, a lock lever rotation shaft 32 rigidly connected to the lever 30, and the lock lever rotation shaft 3.
2, and a stopper 36 fixed to the floor surface 2a so as to abut and support the lock lever 35, which rotatably projects into the entrance path of the sheath cutter 8. A closed switchboard characterized in that A is provided in a box body 2.