KR20030057081A - Ground switch - Google Patents

Abstract

PURPOSE: A ground switch is provided to be easy to operate and to improve a stability according to large current conduction and accident current. CONSTITUTION: A plurality of fixing contacts(205) are fixed at a mounting plate(207) through support insulators, and a switch shaft(202) is connected to the mounting plate. A plurality of moving contacts(208) are connected to the switch shaft(202) so as to correspond to each fixing contact. The moving contacts(208) and the fixing contacts(205) are integrated at the mounting plate(207) so as to be attached to clads by the mounting plate.

Description

Earthing Switch {GROUND SWITCH}

The present invention relates to a grounding switch of a switchboard of an industrial electric device, and in particular, a driving mechanism and a current-carrying part for protecting a circuit and a device having a capability of inputting and energizing an accident current while safely connecting a charging current under no load. To a grounded ground switch.

In general, the switchgear field is a device used to monitor, control, and protect the electric system used for power distribution of electric power sent from power plants and substations to consumers (mainly high-pressure water users), and structurally attaches breakers, protection relays, and meter-type unit devices. It consists of a structure that supports and protects and a collection of wires that connect and connect them.

The gas insulated switchgear and the insulated switchgear are divided into two types by the insulation method in the switchboard. In terms of the functional aspects, it is classified into the main purpose of monitoring control, the main purpose of opening and closing, and the main purpose of power conversion by a semiconductor or the like.

The present invention relates to a grounding switch used in combination with an applied vacuum circuit breaker, wherein the grounding switch has a fixed contact portion supported by an insulator, a rotating shaft portion fixed to a blade-shaped movable contact, and a rotating shaft thereof. A drive for transmitting power is further configured.

In the conventional ground switch, as shown in FIGS. 1 to 3, the bevel gears 103 and 104 are coupled to each other at the ends of the driving shaft 101 and the opening / closing shaft 102, and the fixed contact 105 is connected. The contact spring 110 is fastened to the mounting plate 107 via the support insulator 106, and the movable contact 108 is coupled to the opening and closing shaft 102, and the contact spring 110 forms a contact pressure at the end of the movable contact 108. ) Is fixed through the spring holder 111.

In addition, the mounting plate 107 is configured to be firmly installed at the lower end of the cradle 109 for the vacuum circuit breaker.

In the conventional ground switch, when the operator inserts the operation handle into the drive shaft 101 and rotates it in a clockwise or counterclockwise direction, the bevel gear 103 installed at the end of the drive shaft 101 is interlocked to rotate and interlock with each other. When the rotational force is transmitted to the bevel gear 104, the rotational force of the drive shaft 101 is changed in the direction perpendicular to the power is transmitted to the opening and closing shaft (102). In addition, the movable contact 108 welded on the opening / closing shaft 102 rotates in accordance with the rotational direction of the opening / closing shaft 102 to be coupled to or separated from the fixed contact 105 provided on the support insulator 106.

In addition, when the fixed contact 105 and the movable contact 108 are coupled to each other, a path for grounding the current remaining on the load side is formed.

Looking at the problem of such a conventional grounding switch, in the state that the grounding switch is put in, that is, the movable contact 108 and the fixed contact 105 is coupled, in a state that the appropriate spring force acting on the movable contact 108 When the accident current is energized, the current must be capable of energizing the current for a predetermined time, and after the energization, the ground switch can be easily opened, that is, the movable contact 108 can be completely separated from the fixed contact 105. The bevel gears 103 and 104 have a very difficult disadvantage in separating the movable contact 108 from the fixed contact 105 while overcoming the welding force generated by the welding phenomenon generated by the accident current. The reason for this is that when the operator inserts the operation handle into the drive shaft 101 and rotates it clockwise to open the ground switch, a slight flow occurs in the drive shaft 101, and thus, at the end of the drive shaft 101. This is because the bevel gear 103 provided is separated from the bevel gear 104 provided at the end of the opening and closing shaft 102. In this case, the pair of bevel gears 103 and 104 do not mesh with each other in the pitch circle, and thus the driving force cannot be properly transmitted.

In addition, in general, the operator rotates the drive shaft 101 in the clockwise direction in order to insert the ground switch. However, in the related art, the direction is counterclockwise, which may cause confusion in terms of operation.

In addition, according to the magnitude of the fault current, the shape of the movable contact 108 and the contact pressure applied to the movable contact 108 are different. However, when the fault current is large, there is a limit in energizing the conventional structure.

The present invention has been made to solve the above-mentioned conventional defects and problems, it is easy to operate for the insertion and opening of the grounding switch, and provides a grounding switch that can improve the stability according to the large current and accident current The purpose is to.

1 is a perspective view of a conventional grounding switch.

2 and 3 are a front view and a side view showing a movable contact of the conventional ground switch.

4 to 14 is a view of the grounding switch according to the present invention,

4 is a plan view of the grounding switch.

Figure 5 is a side view of the grounding switch.

6 and 7 are plan and side views of the movable contact.

8 is a plan view showing a combined form of the driving bevel gear and the driven bevel gear.

9 is a front view of a driven bevel gear.

10 is a side view of the drive bevel gear.

11 is a view showing an extract of the pin fixed to the end of the opening and closing shaft.

12 is a block diagram showing an extract of the contact plate.

Figure 13 is a schematic view showing the force divider.

14 is a perspective view of a grounding switch according to the present invention;

<Description of the reference numerals for the main parts of the drawings>

200: joint 202: opening and closing shaft

203: driven bevel gear 204: driven bevel gear

204a: groove 205: fixed contact

206: support insulator 207: mounting plate

208: movable contact 208a: connecting member

208b: Contact plate 208e: Connector

208f: Spacing ring 208g: Connecting rod

208h: notch 208i: groove

209: contact spring 210: spring holder

211: force divider 211a: square base

211b: insertion hole 211c: annular protrusion

211d: support

In order to achieve the above object, the ground switch according to the present invention is configured such that the movable contact portion and the fixed contact portion are integrated to be attached to the lower portion of the cradle for the vacuum circuit breaker by a mounting plate. In addition, a force divider is provided to distribute the force of the contact spring evenly to the end of the movable contact, and the center of the end of the movable contact is cut out so as to be suitable for high current conduction. In addition, the driving bevel gear and the driven bevel gear for changing the direction of rotational force of the drive shaft to the grounding switch and transmitting to the open / close shaft are configured together at the open / close shaft end. The drive switching device which is a part of the present invention is also an apparatus configured to transfer power by changing the transmission of power in a right direction as an accessory device configured in the power transmission device.

More specifically, the ground switch according to the present invention has a plurality of fixed contacts are fixed to the mounting plate via supporting insulators, and the movable shafts are rotatably coupled to the mounting plate, and a plurality of movable contacts correspond to the fixed contacts. The movable contact and the fixed contact are integrally formed with the mounting plate in such a manner as to be coupled to each other, and configured to attach to the cradle for a vacuum circuit breaker by the mounting plate.

In addition, the movable contact is a connecting rod is inserted through the gap ring in the front end connection hole of both contact plates connected to the opening and closing shaft via a connecting member, and the force divider and the contact spring is inserted into both sides of the connecting rod, respectively Spring holders are fixed to each end, and a cutout is formed at the front end of the contact plate, and the force divider has support portions formed at both ends of the square base part having an insertion hole and an annular protrusion at the center thereof. It is configured to fit into the groove formed on both sides of the cutout of the plate.

In addition, the driving bevel gear and the driven bevel gear is coupled to the joint to engage the joint to the end of the opening and closing shaft, the driving bevel gear to form a groove, the operation handle is inserted into the groove of the driving bevel gear Rotating the drive bevel gear is configured to rotate the opening and closing shaft while the driven bevel gear rotates together.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail as follows.

4 to 14 are views of the ground switch according to the present invention, Figure 4 is a plan view of the ground switch, Figure 5 is a side view of the ground switch, respectively, Figures 6 and 7 are a plan view and a side view of the movable contact Each is shown, and Fig. 14 is a perspective view of the grounding switch according to the present invention.

First, in the drawing, 201 is a drive shaft, 202 is an open / close shaft, 203 is a driven bevel gear, and 204 is a drive bevel gear, and a plurality of fixed contacts 205 are mounted on the mounting plate 207 through the support insulator 206. And a plurality of movable contacts 208 are respectively coupled to the opening and closing shafts 202 rotatably coupled to the mounting plate 207 so as to correspond to the respective fixed contacts 205 to rotate the opening and closing shafts 202. The movable contact 208 is brought into contact with and disconnected from the fixed contact 205 by applying.

The movable contact 208 has contact plates 208b disposed on both sides of the connecting member 208a welded to the opening / closing shaft 202 as shown in FIGS. 6 and 7 in the rear end portion and the connecting hole 208e of the intermediate portion. The nut 208d is fastened and fixed to the bolt 208c to be inserted, and the connecting rod 208g is inserted into the connecting hole 208e formed at the front end of both contact plates 208b via the spacer ring 208f, and the connecting rod The force divider 211 and the contact spring 209 are inserted in both sides of 208g, and the spring holder 210 is fixed to the end part.

As for the contact plate 208b of the said movable contact 208, the notch part 208h is formed in the front-end | tip middle part as shown in FIG. 11, and the recessed part 208i is formed in the both sides. As shown in FIG. 12, the force divider 211 has an insertion hole 211b formed at the center of the square base portion 211a for coupling with the connecting rod 208g, and for supporting the pressure spring 209 around the force divider 211a. The annular protrusion 211c is formed, and support portions 211d fitted to the grooves 208i of both contact plates 208b are formed at both end portions of the square base portion 211a.

The opening and closing shaft rotating means for rotating the opening and closing shaft 202 may be used using the above-described conventional configuration, in the present invention, as shown in Figs. 8 and 9, the driving bevel gear 204 and the driven in the joint 200 The bevel gear 203 is engaged with each other to engage the joint 200 to the end of the opening and closing shaft 202 as shown in Figure 4, the driving bevel gear 204 has a groove 204a for inserting and rotating the operation handle When the driving bevel gear 204 is rotated by the operation handle, the driven bevel gear 203 rotates together, so that the opening and closing shaft 202 rotates.

As shown in FIG. 10, a through hole 203a is formed in the driven bevel gear 203, and a pin 212 as shown in FIG. 11 is fixed to the end of the opening and closing shaft 202 through the through hole 203a.

More specifically, the end of the drive shaft 201 to be rotated by the operator inserting the operation handle has a shape that can be inserted into the drive bevel gear 204 installed at the end of the opening and closing shaft 202, the ground switch When the drive shaft 201 is rotated in the clockwise direction to inject the drive shaft 201, the drive shaft 201 rotates the drive bevel gear 204, and when the power is transmitted to the engaged driven bevel gear 203 in a perpendicular direction, the driven bevel gear 203 is rotated. The opening and closing shaft 202 is rotated by the rotational force of), and thus the movable contact 208 welded on the opening and closing shaft 202 is in the direction of the fixed contact 205 coupled to the support insulator 206. Is rotated and moved.

When the opening and closing shaft 202 is rotated by a predetermined angle is rotated quickly by the force of the spring provided in the drive mechanism of the ground switch from a predetermined position is automatically injected, the movable contact 208 and the fixed contact 205 is completely At the combined time, rotation of the opening and closing shaft 202 is stopped and the operation is stopped.

When the operation handle is inserted into the drive shaft 201 and rotated counterclockwise to open the ground switch, the driving bevel gear 204 rotates the driven bevel gear 203 counterclockwise, so that the opening and closing shaft 202 is It is moved to the position to return to the initial state.

In the present invention as described above, the operator rotates the drive shaft 201 clockwise to inject and operate the ground switch, and rotates counterclockwise to open the ground switch, thereby facilitating operation, and driving shaft 201. Even though there is a slight flow in the driving shaft 202, the driving bevel gear 204 and the driven bevel gear 203 are installed together so that power switching is ensured, so that some welding occurs in the ground switch due to the high current. Even if the opening operation was smoothly achieved, the stability of the operation was achieved.

In addition, if the fault current is energized for a predetermined time while the ground switch is turned on, the movable contact 208 and the fixed contact 205 may be caused when the current does not flow smoothly or the contact pressure of the contact spring 209 is weak. ) Welds are generated between each other. If the welding points are increased or severely welded, it will cause a fatal problem that the ground switch will not open and the water distribution system will no longer be operated. In order to facilitate the flow of current at the time of energizing a large current to develop an optimum movable contact portion to overcome the electron repelling force generated between the fixed contact 205 and the movable contact 208. The force divider 211, which serves to fix the pressure spring 209 installed at the end of the movable contact portion and simultaneously exerts the force of the pressure spring 209, is a key element, and is capable of energizing an accident current for more than 3 seconds. Helps to achieve high performance

The present invention as described above has the advantage that the operator can operate the ground switch by rotating the drive shaft clockwise to insert the ground switch, and rotate the counterclockwise to open the ground switch. In addition, even if a small amount of welding occurs on the ground switch due to the large current, smooth operation of the open operation improves the stability of operation, and facilitates the flow of current during the large current, while overcoming the electromagnetic repulsive force generated between the fixed contact and the movable contact. There is an advantage to this. In addition, the force divider which serves to fix the contact spring installed at the end of the movable contact portion and at the same time has an advantage of exhibiting high performance capable of energizing an accident current for at least 3 seconds by a force divider that efficiently operates the force of the contact spring.

Claims (3)

A plurality of fixed contacts 205 are respectively fixed to the mounting plate 207 via the support insulator 206, and a plurality of movable contacts 208 are provided on the opening and closing shaft 202 rotatably coupled to the mounting plate 207. ) And the movable contact 208 and the fixed contact 205 are integrated into the mounting plate 207 in a form that is coupled to correspond to each of the fixed contact 205, the cradle for the vacuum circuit breaker by the mounting plate 207 Grounding switch, characterized in that configured to attach to. 2. The movable contact 208 has a gap ring 208f at the front end connecting hole 208e of both contact plates 208b connected to the opening and closing shaft 202 via a connecting member 208a. A connecting rod 208g is inserted therebetween, and a force divider 211 and a contact spring 209 are respectively inserted in both side portions of the connecting rod 208g, and spring holders 210 are fixed to the ends, respectively, and the contact plate A cutout portion 208h is formed at the front end middle portion of 208b, and the force divider 211 is provided at both side ends of the square base portion 211a provided with an insertion hole 211b and an annular protrusion 211c at the center thereof. Grounding switch characterized in that the support portion (211d) is formed and fitted into the groove (208i) formed on both sides of the cut-out portion (208h) of the contact plates (208b). The method of claim 1, wherein the driving bevel gear 204 and the driven bevel gear 203 is engaged with the joint 200 to engage the joint 200 to the end of the opening and closing shaft 202, the drive The bevel gear 204 is provided with a groove 204a. When the driving bevel gear 204 is rotated by an operation handle inserted into the groove 204a of the driving bevel gear 204, the driven bevel gear 203 is rotated. Grounding switch, characterized in that configured to rotate while opening and closing the shaft (202).