JPH0984226A - Interlock device of pull-out breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an interlock device operate without fail even when a power supply for an operation is off, by joining a stopper to a link mechanism interlocking with a breaker part and by making this stopper engage with the base side at the time when the breaker part is in a closed state. SOLUTION: When a breaker part is closed, an operating rod 24 lowers, interlocking with the breaker part. Then a stopper 21 at the lower end of the operating rod 24 comes to a position of a dotted line and the right-and-left movement of a truck 8 stops. When the breaker part is opened, on the other hand, the stopper 21 rises and the truck 8 becomes movable right and left freely. Since an interlock device operates mechanically completely according to this constitution, a disconnector part is not closed at all even when a power supply for an operation is off, only on condition that the breaker part is in a closed state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock device for preventing a disconnecting section from opening and closing when the breaking section of a drawer type circuit breaker is in a closed state.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing the structure of a conventional drawer type circuit breaker. Frame 4 and rail 9 on base 4
Are fixed, and the carriage 8 is mounted on the rail 9. An airtight container 7 is placed on the dolly 8, and a shutoff unit (not shown) is housed in the airtight container 7. Further, the porcelain insulators 5, 6 are placed on the closed container 7, and SF ₆ gas is enclosed inside the closed container 7 and the porcelain insulators 5, ₆ . Main circuit terminals 11A and 11B are attached to the respective ends of the porcelain bushings 5 and 6. Main circuit terminal 11
A is connected to the blocking portion in the closed container 7 through the conductors in the porcelain bushings 5 and 6. On the other hand, the main circuit terminal 11B is connected to the cutoff portion in the closed container 7 via another conductor inside the porcelain insulator 6. The main circuit terminals 11A and 11B are connected to other devices (not shown) via the main circuits 1A and 1B, respectively. The main circuits 1A and 1B are supported by the support insulators 2A and 2B, and the frame 16 is supported via the pedestal 3.
It is fixed to. The operation panel 10 of this apparatus is mounted on the frame 16. In the device of FIG. 5, the main circuits 1A and 1B are opened and closed by a breaker in the closed container 7, and the main circuits 1A and 1B are connected to the main circuit terminals 11A and 11B.
You can disconnect at. That is, the main circuit terminals 11A and 11B form the disconnection section 11. The dolly 8 is movable left and right, and main circuit terminals 11A and 11B
The disconnecting portion 11 opens and closes when the right end of the main circuit contacts and separates from the left end of the main circuits 1A and 1B. The main circuits 1A and 1B
, Two more similar ones are arranged on the depth side of the figure to form a three-phase circuit. For each phase, a closed container 7 having the same configuration as that in FIG.

FIG. 6 is a side view showing a state in which the disconnecting section 11 of FIG. 5 is disconnected. That is, the dolly 8 in FIG. 5 is pulled out to the near side (left side) along the rail 9.
The main circuit terminals 11A and 11B are separated from the main circuits 1A and 1B, respectively, and the disconnecting section 11 is cut off. The disconnector 11 can be turned on again by moving the carriage 8 to the right.

When the disconnecting section 11 is shut off as shown in FIG. 6, normally, the shutoff section in the closed container 7 is shut off. However, the operation test may be performed in the state of FIG. At that time, if the disconnecting section 11 is mistakenly inserted in a state where the shutoff section in the closed container 7 is closed, an arc is generated in the disconnecting section 11, which is very dangerous. To avoid this, an interlock device is provided to prevent the disconnecting part from opening and closing when the shut-off part is in the closed state.

That is, the interlock device receives an opening / closing electric signal of an auxiliary contact which works with the breaking portion when the breaking portion is in a closed state, and thereby electromagnetically drives a pin (not shown) to thereby move the cart 8 Are held so that they do not move.

[0006]

However, the conventional device as described above has a problem that the interlock device does not operate when the operating power supply fails. That is, since the interlock device is electrical, the interlock device does not work when the power supply for operation fails, and there is a risk that the disconnecting part is accidentally closed when the breaking part is in the closed state.

It is an object of the present invention to completely mechanically configure the interlock device so that the interlock device always operates even when the operating power supply is out of power.

[0008]

In order to achieve the above object, according to the present invention, there is provided a disconnecting portion which is placed on a base and is pulled out to the front so that the main circuit terminals at both ends of the breaking portion are separated from the main circuit side. It is an interlock device for preventing the disconnecting part from opening and closing when the breaker part of the drawer type circuit breaker is in the closed state, and the stopper is connected to the link mechanism that interlocks with the breaker part. It is preferable that the part is locked to the base side in the closed state. As a result, the interlock device operates completely mechanically, so that even if the power supply for operation is out of power, the disconnection section is never turned on as long as the interruption section is in the on state.

Further, in such a configuration, it is preferable that the stopper is always locked to the base side when the cutoff portion is in the closed state regardless of whether the disconnection portion is closed or closed. This eliminates the risk of erroneously disconnecting the disconnecting section even when both the disconnecting section and the disconnecting section are in the closed state.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a side view showing the structure of a drawer type circuit breaker according to an embodiment of the present invention. An operation rod 24 for an interlock device is connected to a shutoff portion in the closed container 7. 2 is a side view showing a state in which the disconnecting section 11 of FIG. 1 is disconnected.

1 and 2, the detailed structure of the interlock device will be described later, but when the blocking portion is turned on, the operating rod 24 is lowered in conjunction with the blocking portion and the stopper 21 at the lower end of the operating rod 24 is interlocked. Came to the position of the dotted line,
The left and right movements of the carriage 8 are stopped. On the other hand, when the blocking portion is blocked, the stopper 21 is raised and the carriage 8 can freely move left and right. The other parts of FIGS. 1 and 2 are the same as the conventional configuration of FIGS. 5 and 6, respectively. The same parts as those of the related art are designated by the same reference numerals, and detailed description thereof will not be repeated here.

FIG. 3 is a plan view of the apparatus shown in FIG. 1, and shows only the frame 16 on the base, excluding the closed container and supporting insulator of the apparatus. A frame member 20 is also stretched in the center of the frame 16 stretched in a square shape. Rails 9 are fixed to the left and right of the frame 16, and stopper receivers 13 made of channel steel are fixed across the frame 16 and the frame member 20. Stopper receiver 13
There are two holes 14 and 15 in which the stoppers of the interlock device fit.

In FIG. 3, alternate long and short dash lines 17 and 18 are the central positions of the closed container when the disconnecting section is in the closed and closed states, respectively. The stopper of the interlock device is fitted into the hole 14 when the disconnecting portion is in the closed state, and the stopper of the interlock device is fitted into the hole 15 when the disconnecting portion is in the closed state. 4A and 4B are front views showing the configuration of the interlock device of FIG. 1, wherein FIG. 4A is a front view when the blocking unit is in a blocking state, and FIG. 4B is a front view when the blocking unit is in a closing state. Further, FIG. 4 is a front view seen from the left side of FIG. 1 in all cases, but among them, only members related to the interlock device are shown in an enlarged manner, and other parts are not shown. Has been done.

In FIG. 4A, a hole 1 is formed on one side of the channel steel.
A pin-shaped stopper 21 is arranged above the stopper receiver 13 provided with 4 or 15, and an operation rod 24 is attached to this stopper 21 via a compression spring 22 and a mounting member 23. On the other hand, the crank rod 28 is attached to the drive rod 29 of the drive unit (not shown) of the shutoff unit.
Are connected via a pin 32, and the crank lever 28
Is rotatably supported by the fixed shaft 30. The crank lever 28 is connected to a contact (not shown) of the breaking portion via a pin 31 arranged at one end. The interlock device forms a link mechanism from a pin 33 arranged at another position of the crank lever 28 to the operation rod 24, and the crank lever 28 and the stopper 21 are interlocked with each other. That is, the bending lever 27 is attached to the pin 33.
Further, one arm of the two-arm lever 25 is connected to the bending lever 27. The two-armed lever 25 is
It is rotatably supported by a fixed shaft 26, and the other arm of the two-arm lever 25 is connected to the operation rod 24. When a closing command is issued to the cutoff portion, the drive rod 29 is driven leftward, and the crank lever 28 rotates clockwise around the fixed shaft 30. Since the pin 31 moves upward in conjunction with this, the contact of the breaking portion is closed. The drive rod 29
Two more crank levers 28 (not shown) are connected to the right side of the, and the contacts of the breaking portion of the other phase are simultaneously closed by one drive rod 29.

Further, in FIG. 4A, the bending lever 27 is pushed to the left by the crank lever 28 during the operation of closing the contact of the breaking portion, so that the two-arm lever 2
5 rotates clockwise around the fixed shaft 26. Since the operation rod 24 moves downwards in conjunction with this, the stopper 21 enters the hole 14 or 15 of the stopper receiver 13 and the state as shown in FIG.
4, i.e., the blocking part cannot move forward and backward in the figure. Therefore, even if the power supply for operation has a power failure when the shut-off portion is in the closed state, the state as shown in FIG. 4B is maintained, so that the shut-off portion cannot be opened and closed. The compression spring 2
Reference numeral 2 is for relaxing the repulsive force toward the two-arm lever 25 side by contracting the stopper receiver 13 when the stopper 21 penetrates the hole 14 or 15.
In the state of FIG. 4 (B), if the shutoff portion is shut off, the drive rod 29 is pulled to the right, so that the link mechanism moves in the opposite direction described above and the stopper 21 is raised so that the state shown in FIG.
State.

Returning to FIG. 3, when the disconnecting portion is in the closed state and the shutoff portion is in the closed state, the stopper is always fitted in the hole 14 and locked to the frame 16. Therefore, it is impossible for the disconnecting part to be disconnected while the disconnecting part is closed. If the shutoff portion is in the closed state when the shutoff portion is in the shutoff state, the stopper is always fitted into the hole 15 and locked to the frame 16. For this reason, the disconnecting section is never closed while the blocking section is closed.

[0017]

As described above, according to the present invention, the stopper is connected to the link mechanism interlocking with the blocking portion, and the stopper is locked to the base side when the blocking portion is in the closed state.
Thereby, even if the power supply for operation is out of power, the disconnecting section will not be accidentally turned on when the interruption section is in the closed state, and the danger of arcing at the disconnecting section is eliminated.

Further, in such a configuration, the stopper is always locked to the base side when the cutoff portion is in the closed state regardless of whether the disconnection portion is closed or closed. As a result, when both the shutoff unit and the disconnecting unit are in the ON state, even if the power supply for operation is out of power, the disconnecting unit will not be accidentally turned ON, and there is a danger that an arc will occur at the disconnecting unit. It never happens.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a drawer type circuit breaker according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the disconnection portion of FIG. 1 is disconnected.

FIG. 3 is a plan view of the device of FIG.

4A and 4B are front views showing the configuration of the interlock device of FIG. 1, where FIG. 4A is a front view when the blocking unit is in a blocking state, and FIG. 4B is a front view when the blocking unit is in a closing state.

FIG. 5 is a side view showing a configuration of a conventional drawer type circuit breaker.

6 is a side view showing a state in which the disconnecting portion of FIG. 5 is disconnected.

[Explanation of symbols]

1A, 1B: main circuit, 4: base, 7: closed container, 8:
Cart, 9: Rail, 10: Control panel, 11: Disconnector, 11
A, 11B: main circuit terminal, 13: stopper receiver, 14,
15: hole, 16: frame, 20: frame material, 21:
Stopper, 22: compression spring, 24: operating rod, 25:
Two-arm lever, 26, 30: fixed axis, 27: curved lever,
28: Crank lever, 29: Drive rod, 31, 3
2,33: Pin

Claims (2)

[Claims] 1. A disconnection part of a drawer type circuit breaker having a disconnection part in which main circuit terminals at both ends of the disconnection part are separated from the main circuit side by being placed on a base and pulled out to the front when the disconnection part is opened. It is an interlock device for preventing opening and closing, and a stopper is connected to a link mechanism that interlocks with a blocking part, and this stopper is locked to the base side when the blocking part is in a closed state. An interlock device for the draw-out circuit breaker. 2. The stopper according to claim 1, wherein the stopper is always locked to the base side when the disconnecting portion is in the closed state regardless of whether the disconnecting portion is closed or disconnected. Drawer type circuit breaker interlock device.