JPS59198806A - Truck grounding device of switchboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a cart-type grounding device for grounding a busbar or load cable during maintenance and inspection of a high-voltage distribution board having a drawer-type circuit breaker.

It is normal for the high voltage main circuit of extra high voltage and high voltage switchboards to be grounded for safety purposes during maintenance and inspection, but it is desirable that the grounding be done easily, safely and reliably using the simplest possible device.

Conventionally, for high-voltage distribution panels that require a grounding device for the high-voltage main circuit, a grounding switch is installed inside the panel, or a vacuum circuit breaker 2 is installed on a movable trolley 1 as shown in FIGS. 1 and 2.
A power distribution board in which a lifting platform 4 having a movable contactor 3 and a movable contactor 3 is mounted so as to be movable up and down, both ends of a vacuum circuit breaker 2 are connected to a movable contactor 3 and a grounding terminal 5, and a movable trolley 1 has a drawer-type circuit breaker pulled out. After the movable contactor 8 is inserted and connected to the busbar of the panel or the load cable connection end, the vacuum circuit breaker 2 is turned on and grounded. In the former case, the power distribution board is complicated, large, and expensive because the grounding switch and its operation selection mechanism are housed inside the panel, whereas in the latter case, one grounding device can be used commonly by many power distribution boards. However, the drawback is that the vacuum circuit breaker, its auxiliary equipment, and lifting device are complicated and expensive.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and mounts a grounding switch having a closing capacity and a movable contactor which can be selectively and interchangeably connected to the connecting end of a bus bar or a load cable on a movable carriage equipped with a retracting mechanism. The object of the present invention is to provide a trolley-type grounding device that connects a circuit breaker to a power distribution board to ground a high-voltage main circuit.

[Key points of the invention]

In order to achieve the above object, the present invention has a retracting device in which a rotating arm having a roller at its tip that engages with a guide groove provided in a side wall of a board is attached to both ends of an operating shaft that is rotated by a handle operation. A conductor bar is attached vertically to the movable trolley via an insulator, facing the busbar of the switchboard and the load cable connection end, and a movable contact that can be selectively replaced according to the busbar or load cable is attached to this conductor bar. The present invention is intended to mount an earthing switch having a closing capacity to open and close between the conductor bar and a grounding terminal provided on the truck.

[Embodiments of the invention]

Next, embodiments of the present invention will be described below with reference to the drawings. 8 and 4 show a trolley type grounding device according to an embodiment of the present invention, with FIG. 8 being a front view and FIG. 4 being a side view. In these figures, 6 is a movable trolley equipped with wheels 61 and capable of being moved freely. This movable trolley 6 is rotated by a handle 7 via a rotating shaft 8 and a worm gear 9. The operating shaft 10 is arranged horizontally and perpendicular to the running direction of the trolley, and a switchboard (not shown) is attached to the tip fixed to both ends of the operating shaft 10. Roller 11 that engages with a vertical guide groove provided on the side wall
It is equipped with a retracting device consisting of a rotating arm 12 having a rotary arm 12. Further, eight conductor bars 13 are vertically attached to the trolley 6 via insulators 14, facing the busbar connection ends and load cable connection ends of a distribution board (not shown). A movable contactor 15 is attached so as to protrude in the vibration direction so that the cable connection end can be selected and replaced. 16 is a mutually insulating barrier.

17 is a grounding terminal, and a grounding switch 18 is interposed between the grounding terminal 17 and the conductor bar 13 to connect the grounding terminal 17 and the conductor bar 13. The earthing switch 18 has a closing spring 181, and is opened and closed by a hash door 19 from the front of the truck via an operating shaft 20 and a crank 21. 22 is a voltage transformer for voltage detection, which is connected to the conductor bar 13. Cams 2B and 24 are attached to the truck pull-in operating shaft 10 and the earthing switch operating shaft 20, respectively, and a locking rod 25 is interposed between these cams to provide an interlock.

Furthermore, on the front plate of the trolley into which the handle 19 for operating the earthing switch is inserted, there is a locking plate 2 that opens and closes the handle insertion hole in response to a signal from the voltage transformer 22 or the circuit breaker of another switchboard.
6 is provided. 27 is a selection operation device for selectively attaching the movable contact 15 to the conductor bar 18 at the connection end of the bus bar or load cable;
They are pin-coupled to a cover 80 that covers the surface of the conductor bar 13 and slides up and down. The connecting rods 32a and 132b connected to the strikers 31σ and 31b are connected via a bottle.

Next, we will discuss how to operate this grounding device. Move the movable trolley 6 to the front of the switchboard from which the drawer-type circuit breaker has been pulled out,
Therefore, the movable contact 15 is attached to the conductor bar 13 facing the connection end selected by the selection operation device 27, the earthing switch 18 is turned OFF, the trolley is pushed into the panel, and the handle 7
When the trolley 6 is pulled into the grounding position by rotating, the grounding terminal 17 is also connected to a grounding terminal (not shown) provided on the panel.

Then, the handle 19 is rotated 6 to close the earthing switch 18 and perform earthing. When grounding the other connection end, turn off the grounding switch 18, pull out the trolley 6, and move the movable contact 1.
5 from the conductor bar 13, switch the tracing operation device 27, replace the movable contact 15 with the conductor bar 13 at a position opposite to the connection end to be grounded, and perform the grounding according to the procedure described above.

〔Effect of the invention〕

According to the present invention, an inexpensive trolley-shaped grounding device with a simple structure, easy operation, and no risk of erroneous operation is shared by many switchboards, and the high-voltage main circuit of the switchboard can be grounded safely and reliably, so maintenance of the switchboard can be carried out. This has the effect of improving safety and safety.

[Brief explanation of the drawing]

1 and 2 are a front view and a side view of a conventional truck-type grounding device, and FIGS. 3 and 4 are a front view and a side view of a truck-type grounding device according to an embodiment of the present invention. 1: Movable trolley, 2: Vacuum circuit breaker, 3: Movable contact, 4:
Elevating platform, 5: Ground terminal, 6: Movable trolley, 7: Handle,
8-Rotation axis, 9: Worm gear, 10: Operation axis, 11:
Roller, 12: Rotating arm, 13: Conductor bar, 14: Insulator, 15: Movable contact, 16: Insulating barrier, 17: Grounding terminal, 18: Earthing switch, 19: Handle, 20: Operating shaft, 21: Crank, 22: Voltage transformer, 2B, 24
: cam, 25: locking rod, 26: locking plate, 27: selection operation device, 28 nibble bar, 29: crank, 80: cover, 31iy, atb: striker, 82a,
82b: Connecting rod. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] In a trolley-type grounding device in which the circuit breaker of a power distribution board with a draw-out type circuit breaker is pulled into the pulled-out panel and the connection end of the bus bar or load cable is grounded, the circuit breaker can be rotated via a gear by operating the handle from the front. A rotating arm is fixed to both ends of an operating shaft which is installed horizontally and perpendicular to the direction in which the cart is moving. An insertion device is provided on a movable trolley, and a conductor bar is vertically attached to the trolley via an insulator facing the busbar of the panel and the connection end of the load cable, and a movable contact is inserted into the conductor bar and connected to the connection end. is selectively and replaceably installed in accordance with the bus bar or load cable, and is equipped with an earthing switch having a closing capacity for opening and closing between the conductor bar and a grounding terminal provided on the trolley. Trolley type grounding device for switchboard.