JP3416971B2 - Lifting type double busbar circuit breaker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an up / down type double-bus circuit breaker used for a double-bus type switchboard. 2. Description of the Related Art Switching of buses in a double-bus type switchboard has been performed by a disconnector. However, since a large space is required and the cost is high, a breaker for an up-and-down double-bus type (hereinafter simply referred to as a breaker). The switch is used to switch the bus. FIG. 4 is an explanatory diagram of a bus switching procedure in a double bus type switchboard containing a circuit breaker (hereinafter simply referred to as a switchboard). In FIG. 4, 1 is a switchboard, 2 is a measurement control room, 3 is an equipment room, 4 is a first bus, 5 is a cable, 6 is a second bus, and each bus and cable are separated by a partition. It is provided in a room. Reference numeral 7 denotes a partition wall between the equipment room 3 and the cable and bus room, and is provided with the following fixed disconnecting portions. 8 is for the first bus 4, 9 is for the cable 5,
Reference numeral 10 denotes a fixed disconnecting portion for the second bus 6. Reference numeral 11 denotes a circuit breaker unit having a movable disconnecting unit 11a and vertically moving up and down. Reference numeral 12 denotes a lift truck, and the circuit breaker unit 11 and the lift truck 12
3. In order to switch the first bus 4 connected to the cable 5 through the circuit breaker 13 shown in FIG. 4A to the second bus 6, as shown in FIG. 13 to the disconnection position, and as shown in FIG.
1 is raised to a predetermined upper position, and the circuit breaker 13 is inserted to the connection position as shown in FIG. In order to switch the second bus 6 connected to the cable 5 via the circuit breaker 13 to the first bus 4, the circuit breaker 13 is disconnected as shown in FIG. 4A, the circuit breaker unit 11 is lowered to a predetermined lower position as shown in FIG. 4B, and the circuit breaker 13 is inserted to the connection position as shown in FIG. 4A. FIG. 5 is a front view of the circuit breaker 13. Reference numeral 14 denotes a handle that can be inserted and removed to move the circuit breaker unit 11 up and down. Reference numeral 15 denotes a drive shaft that rotates through a bevel gear when the handle 14 is turned. Is a drive shaft 1 via a bevel gear
A screw rod 17 rotated by 5 is a nut screwed with the screw rod 16. When the handle 14 is turned, the screw rod 16 rotates, and the nut 1 mounted near both side surfaces of the breaker unit 11 is rotated.
7, the circuit breaker section 11 rises or falls. Reference numeral 18 denotes a scale plate attached to the circuit breaker section 11, reference numeral 18a denotes an upper predetermined position scale, and reference numeral 18b denotes a lower predetermined position scale. Reference numeral 19 denotes an oval hole provided on the surface plate 13a of the circuit breaker 13, on which a reference position scale 19a is engraved.
The figure shows a state where the reference position scale 19a and the lower predetermined position scale 18b match. Reference numeral 20 denotes a hole for pressing a manual trip push button provided on the circuit breaker unit 11, and is provided at predetermined positions in the upper and lower parts. Therefore, in order to set the circuit breaker portion 11 at a predetermined lower position to a predetermined upper position during busbar switching work,
The handle 14 is inserted and rotated, and the upper predetermined position scale 18
a until the reference position scale 19a coincides with the circuit breaker unit 11.
a is raised. Further, the circuit breaker unit 11 located at a predetermined upper position
In order to make the lower position be the predetermined position, the handle 14 is inserted and rotated in the opposite direction to the above, and the circuit breaker unit 11 is lowered until the lower predetermined position scale 18b matches the reference position scale 19a. [0011] Even if the procedure of the bus switching operation by raising and lowering the circuit breaker section is clearly defined by a driving operation range or the like, there is a possibility that an operator may perform an erroneous operation. When the circuit breaker is moved up and down while the breaker is in the connection position or the movable disconnection end is in the fixed disconnection, the switchboard and the circuit breaker are damaged. If the breaker is inserted into the connection position in a state where the breaker is not at the predetermined upper or lower position, the switchboard or the breaker may be damaged, or the axes of the movable disconnecting portion and the fixed disconnecting portion may differ by several mm. Also, contact failure occurs at the connection portion. Further, for safety reasons, it is necessary to prevent the circuit breaker from being turned on and off while the circuit breaker is being raised and lowered. The present invention has been made in view of the above points, and an object of the present invention is to provide a lifter-type double-bus breaker capable of safely and reliably switching a bus. Means for achieving the above object of the present invention is to provide a lifter type double-bus breaker comprising a circuit breaker section that moves up and down and a lift car, An interlock plate that is provided on the floor surface, prevents the lock rod from descending from the disconnection position of the circuit breaker on the connection position side, and prevents unlocking of the handle insertion prevention plate; and an interlock plate provided on the circuit breaker unit. And a notch recess at upper and lower predetermined positions, and at a position other than the notch recess, a groove provided on the outer periphery of the boss tip portion of the handle engages with the edge to prevent the handle from being pulled out. Plate and the circuit breaker is outside the switchboard from the disconnecting position, and when the circuit breaker part is at a predetermined upper or lower position, when pressed down against an upward spring force,
The lock bar that releases the lock of the handle insertion prevention plate while pressing the manual release push button of the circuit breaker unit, and the convex portion that is locked by the lock bar and passes through the cutout concave portion of the regulation plate. And a handle insertion preventing plate for opening the closing circuit of the circuit breaker by operating the limit switch by inserting the handle to enable the handle to be inserted into the lifting operation shaft. When the circuit breaker is located closer to the connection position than the disconnection position, the handle cannot be inserted and the lifting operation cannot be performed. The handle can be inserted and removed only when the breaker is outside the disconnection position and the breaker section is at a predetermined upper or lower position. If the handle is not removed, the breaker can be inserted into the connection position. Can not. When the lock bar is pushed down, the manual trip push button of the circuit breaker is pushed, and when the handle is inserted, the closing circuit of the circuit breaker is opened and the closing / cutting operation during the elevating operation cannot be performed.
The opened closing circuit is closed by the return of the handle insertion preventing plate due to the removal of the handle, and the closing operation is enabled. Embodiments of the present invention will be described below with reference to an embodiment shown in the drawings. 4 and 5 are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 is a front view of a main part of the present invention, and FIG. 2 is a side view of FIG. 1. In these figures, reference numeral 21 denotes an interlock plate provided on the floor of a switchboard, which is shown in FIG. Vessel 1
The lock rod 22 is prevented from descending on the connection position side from the disconnection position of No. 3. The lock bar 22 is provided between the upper frame 12a and the lower frame 12b surrounding the drive shaft 15, and 23 is a spring for urging the lock bar 22 upward, and 24 is the upper frame. An L-shaped guide for an L-shaped lock rod 22 attached to 12a, a retaining ring 22a for restricting the upward movement of the lock rod 22, a handle 22b for pushing the lock rod 22 downward against a spring 23, 22c When the lock bar 22 is depressed when the breaker unit 11 is at a predetermined upper or lower position, the push button 25 provided on the breaker unit 11 is pressed, and a trip hook 27 is provided via a bell crank 26. This is a cam for tripping the circuit breaker to a free state and disabling manual operation. A regulating plate 28 is attached to the circuit breaker unit 11 and has notched recesses 28a and 28b at predetermined positions in the upper and lower portions. A regulating plate 29 is guided by a guide rod 30 attached to the upper frame 12a. With the handle insertion preventing plate urged outward, when the circuit breaker 13 is located outside the switchboard from the disconnection position and the circuit breaker unit 11 is at a predetermined upper or lower position, the handle 22b is pushed down. If the lock of the handle insertion prevention plate 29 by the lock bar 22 is released, and the vertical position of the notch recess 28a or 28b of the regulating plate 28 and the projection 29a of the handle insertion prevention plate 29 match, FIG. With the handle 14 shown, the handle insertion preventing plate 29 is pushed inside the regulating plate 28 against the pressing force of the spring 31, and the handle 14 can be inserted into the elevating operation shaft 32. FIG. 3 is an explanatory view of an insertion portion of the handle 14.
(A) is before the handle 14 is inserted, (B) is the handle 14
After insertion. In FIG. 3, reference numeral 34 denotes a bearing portion of an operation shaft 32 fixed to the upper frame 12a. The operation shaft 32 is connected to the drive shaft 15 via bevel gears 35 and 36. As described above, when the lock rod 22 is pushed down by the handle 22b to unlock the handle insertion preventing plate 29 and insert the handle 14 into the operating shaft 32, the limit provided on the upper portion of the handle insertion preventing plate 29 is reached. The switch operating section 29b operates the limit switch 33 attached to the upper frame 12a to open the closing circuit of the circuit breaker so that the circuit breaker cannot be closed. Also, the L-shaped bending provided on the lower part of the handle insertion prevention plate 29 is provided. The portion 29c is the lock bar 22 which has been pushed down.
To prevent the rise. Circuit breaker unit 1 at a predetermined position in the upper or lower part
Handle 1 so that 1 is in the lower or upper position.
When the dial 4 is turned, the groove 14b provided on the outer periphery of the tip of the boss 14a of the handle 14 engages with the edge 28c of the regulating plate 28, making it impossible to remove the handle 14 during the elevating operation. Therefore, when the handle 14 is inserted into the elevating operation shaft 32, the circuit breaker is pulled out, the closing circuit is opened, and the closing and shutting operation cannot be performed. It is impossible to withdraw 14
Further, the lock bar 22 remains protruding downward, so that the breaker 13 cannot be inserted into the connection position. When the circuit breaker 11 reaches a predetermined upper or lower position by performing a lifting operation, when the handle 14 is pulled out,
The handle insertion preventing plate 29 is pushed by the spring 31 and attempts to return to the original position. However, the vertical position of the convex portion 29a of the handle insertion preventing plate 29 and the cutout recess 28b provided on the regulating plate 28 is the same. If they do not match within the gap between them,
The handle insertion preventing plate 29 cannot be pulled out by being hooked on the regulating plate 28, and the breaker 13 cannot be inserted into the connection position because the lock rod 22 does not rise. When the vertical position coincides, the handle insertion prevention plate 29 is pushed out before the regulating plate 28 and returns to the original position, the lock rod 22 rises and the circuit breaker 13 can be inserted into the connection position. And the handle insertion prevention plate 2
9 is locked to prevent the handle 14 from being inserted, and the limit switch 33 and the manual release push button 25 return to enable the closing / closing operation of the circuit breaker. The gap is determined by the required accuracy of the connection position between the movable disconnecting portion of the circuit breaker and the fixed disconnecting portion of the switchboard. The above-described bus switching operation using the circuit breaker 13 will be described with reference to FIG. 4. When the circuit breaker 13 is at the connection position as shown in FIG. 21 prevents the lock rod 22 from descending,
Since the handle 22b cannot be pushed down and the handle 14 cannot be inserted, the raising / lowering operation of the breaker unit 11 cannot be performed. As shown in FIG. 4B, when the circuit breaker 13 is pulled out of the switchboard from the disconnecting position or from the disconnecting position, the handle 22b is pushed down because the circuit breaker unit 11 is at a predetermined lower position, and the handle 14 is pushed down. It can be inserted into the operation shaft 32 to perform a lifting operation. When the handle 14 is inserted into the operation shaft 32, the push button 25 is pressed and the limit switch 3
3, the circuit breaker cannot be turned on and off, and the lock rod 22 remains protruding downward, so that the circuit breaker 13 cannot be inserted into the connection position. Further, the handle 14 cannot be pulled out during the operation of raising and lowering the circuit breaker unit 11. As shown in FIG. 4C, the handle 14 can be pulled out when the circuit breaker 11 reaches a predetermined upper position. When the handle 14 is pulled out, the manual trip push button 25,
When the limit switch 33 returns, the closing and closing operation test of the circuit breaker can be performed, and the lock rod 22 can be raised to be inserted into the connection position. FIG. 4D is a diagram in which the circuit breaker section 11 has inserted the circuit breaker 13 at a predetermined upper position into the connection position and completed the bus switching operation. At this connection position, the handle 14 cannot be inserted. The busbar switching operation by lowering the circuit breaker unit 11 at the upper predetermined position to the lower predetermined position can be performed in the same manner as described above. As described above, the lifting / lowering type double-bus circuit breaker according to the present invention is connected not only when the circuit breaker is at the connection position in the switchboard but also from the disconnection position. When it is at the position side, the handle cannot be inserted into the operation shaft, so that when the movable disconnecting portion is in the fixed disconnecting portion, it is impossible for the switchboard or the circuit breaker to be damaged by the lifting operation. When the circuit breaker is pulled out from the disconnection position, the handle can be inserted into the operation shaft to raise and lower the circuit breaker. The handle cannot be pulled out during the elevating operation, and the turning on / off operation of the breaker cannot be performed while the handle is inserted, so that the elevating operation can be performed safely.
Further, the lock bar projects downward and hits the interlock plate, and the circuit breaker cannot be moved from the disconnection position to the connection position side. When the circuit breaker is at a predetermined upper or lower position after the lifting / lowering operation, the handle can be pulled out. However, the position is determined by the accuracy allowed when connecting the movable disconnecting section and the fixed disconnecting section. If it is not within the range, the handle insertion prevention plate does not return to the position before the handle was inserted, the breaker cannot be turned on / off, and it cannot be moved to the insertion position. It does not damage the connecting portion between the movable disconnecting portion and the fixed disconnecting portion by being inserted, or does not overheat due to poor contact. If the circuit breaker is located at a predetermined position at the upper or lower part and within the range of the accuracy allowed at the time of connection, the handle can be pulled out to perform a closing / closing test of the circuit breaker. You can also. In this way, there is an effect that the bus switching operation can be performed safely and reliably.

[Brief description of the drawings] FIG. 1 is a front view of an essential part showing one embodiment of the present invention. FIG. 2 is a side view of a main part showing one embodiment of the present invention. FIG. 3 is an explanatory view of a handle insertion portion of the present invention. FIG. 4 is an explanatory diagram of a bus switching procedure using a conventional circuit breaker. FIG. 5 is an explanatory front view of a conventional circuit breaker. [Explanation of symbols] 1. Switchboard 11 ... Circuit breaker 12 ... lifting truck 13 ... Circuit breaker (for lifting double busbar) 14 ... handle 14a ... Boss 14b ... groove 21 ... Interlock plate 22 ... Lock bar 23 ... Spring 25 ... Manual trip push button 28 ... Regulation plate 28a, 28b: Notch recess 28c ... edge 29… Handle insertion prevention plate 29a ... convex part 32 ... vertical operation axis 33 ... Limit switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02B 11/12-11/173

Claims (1)

(57) [Claims 1] An elevating double busbar circuit breaker comprising a circuit breaker part which moves up and down and a lift truck, wherein the circuit breaker is provided on the floor of a switchboard and disconnects the circuit breaker. An interlock plate that prevents the lock rod from lowering on the connection position side from the position and prevents unlocking of the handle insertion prevention plate; and a cutout recess provided at the predetermined upper and lower positions provided on the breaker unit, At a position other than the notch recess, a groove provided on the outer periphery of the boss tip portion of the handle engages with an edge to prevent the handle from being pulled out. And when the circuit breaker is at a predetermined upper or lower position, when pressed down against an upward spring force, the manual release push button of the circuit breaker is pressed, and the handle insertion prevention plate is pressed. The lock rod for releasing the lock of the lock; The handle is locked by a lock bar and a convex portion passes through the notch concave portion of the regulating plate to allow the handle to be inserted into an elevating operation shaft. By inserting the handle, a limit switch is operated to operate the breaker. An up-and-down type double bus breaker, comprising: the handle insertion preventing plate for opening a closing circuit.