KR200203184Y1 - 3-Position Arc Extinction Device for SF6 Gas Insulated Padmount Switchgear - Google Patents

Abstract

The present invention enables the grounding work to be miniaturized by eliminating the need for a separate grounding plug, and the operation and the operation of the grounding and opening operation of the grounding circuit and the grounding and opening operation of the grounding circuit are performed on the same axis. The present invention relates to a subunit having a grounding switch of a multi-circuit switch which can ensure the safety of the operator by reducing the installation space and ensuring a reliable grounding by allowing the contact to be moved using only a mechanism.

A main circuit contact point and a ground-side contact point are fixedly arranged on the same axis, and a movable contact point for moving up and down along the movable axis is provided therebetween; Along the movable shaft, the movable contact is operated to have three positions of main circuit energization, openness, and ground, so that the main circuit is inserted and opened, and the ground circuit is opened and opened. When the state is made, the main circuit is characterized in that the open state is maintained.

Description

Sub-section with ground switch of multi-circuit switch {3-Position Arc Extinction Device for SF6 Gas Insulated Padmount Switchgear}

The present invention relates to a subdivision having a ground switch of a multi-circuit switch, and more particularly, it is applied to a multi-circuit switch used for underground lines, so that the input / opening of the main circuit and the grounding / opening of the grounding circuit are performed on the same axis. The present invention relates to a subunit having a grounding switch of a multi-circuit switch which reduces installation space and ensures reliable grounding.

In general, the electricity generated in a power plant is boosted to a very high voltage suitable for power transmission and is then transmitted to a primary substation. In the primary substation, the supplied voltage is dropped to 22.9 KV and supplied to the secondary substation or each customer. Electric power supplied from the primary substation is supplied to the power receiving facilities of each customer through a distribution system consisting of overhead distribution lines and underground distribution lines, and is supplied to low voltage consumers through special high pressure consumers, high pressure consumers and various outdoor transformers.

At this time, a multi-circuit switch is used for the purpose of branching and branching underground distribution lines, and now SF6 gas insulated load switch using SF6 gas as an insulating material is widely used.

The multi-circuit switch according to the prior art is a toggle type operation mechanism for manipulating a two-position (open-closed) contact point so as to be able to completely perform the opening / closing operation of two positions. At this time, the multi-circuit switch of the prior art for the grounding operation is arranged to have a connection state for the operation mechanism for the energization of the main circuit and the connection material for grounding.

1 is a view showing the shape of a stick type connection member used in a multi-circuit switch according to the prior art, Figure 2 is a view showing the shape of a grounding plug used in the multi-circuit switch according to the prior art. .

Referring to FIG. 1, reference numeral 11 denotes a bushing coupled to a switch body (not shown), 12 denotes a distribution line for power transmission, and 13 denotes a connection plug for connection of an external ground terminal. And 14 denotes an insulating cap that blocks the outside when the connection plug 13 is not in use.

On the other hand, referring to Figure 2, one side is connected to the ground plane, the other side is provided with a projection portion 21 that can be coupled to the connection plug 13 of the connecting member is formed in the overall L-shape.

As a result, in the conventional case, the insulating cap 14 is removed from the stick-type connecting member when the line is changed and the cable is replaced, and the protrusion 21 of the grounding plug is coupled to the connecting plug 13. After grounding, perform cable work after grounding.

By the way, as shown in Figure 1, the connection member as shown in Figure 1, because the connection plug 13 and the insulating cap 14 is increased in price, the length of the length of the enclosure to protect the switch is large problem This happens.

In addition, even when the ground state is established, when another operator operates a separate operation mechanism for energizing the main circuit, the working cable may be energized, which may cause personnel accidents, thereby preventing anxiety of the worker. .

The present invention is devised to solve the conventional problems as described above, the purpose is to change the structure of the breaker grounding of the multi-circuit switchgear can be miniaturized by making the grounding work without the need for a separate plug It is to provide a subunit having a switch.

In addition, another object of the present invention is to make the input and the opening of the main circuit and the grounding and opening operation of the grounding circuit to be performed on the same axis, that is, the three-position (opening-grounding) operation using only one operating mechanism. The present invention provides a subtractor having a ground switch of a multi-circuit switch that can secure the operator by reducing the installation space and making sure grounding by moving the contact point.

1 is a view showing the shape of the grounding plug used in the multi-circuit switch according to the prior art

2 is a view showing the shape of the connecting member to which the prior art is applied;

3 is a view showing the structure of the arc extinguisher having a ground switch of a multi-circuit switch according to the present invention

4 is a view showing the shape of the connecting member applied to the present invention

5 is a view showing a state comparing the installation size of the switchgear when the extinguishing unit according to the present invention and the prior art is installed;

According to a feature of the present invention for achieving the above object, the main circuit contact and the ground-side contact is fixedly arranged on the same axis, there is provided with a movable contact for moving up and down along the movable shaft; If the ground contact is made at the time of cable replacement by operating the movable contact along the movable shaft to have three positions of energizing, opening, and grounding of the main circuit to perform the opening and closing of the main circuit and the grounding and opening of the grounding circuit. The main circuit provides an extinguishing section having a ground switch of the multi-circuit switch which is kept open to allow safe operation.

At this time, according to an additional feature of the present invention, the main circuit contact and the ground-side contact is formed with a convex portion, the movable contact is selectively selected according to the convex portion and state of the main circuit contact and the ground-side contact It is preferable that the recessed part joined is formed.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing the structure of the arc extinguishing unit having a ground switch of the multi-circuit switch according to the present invention, Figure 4 is a view showing the shape of the connection member to which the present invention is applied.

Referring to FIG. 3, reference numeral 31 denotes a main circuit contact fixedly installed to be connected to the main circuit, and 32 denotes a ground-side contact fixedly installed on the same axis as the main circuit contact 31 and connected to a ground circuit. 33 represents a movable shaft disposed between the main circuit contact 31 and the ground side contact 32, and 34 represents a vertical movement along the movable shaft 33 to move the main circuit contact 31 and the ground side. It is selectively coupled to the contact 32 to represent a movable contact that operates to have three positions of main circuit energization, open, and ground, and performs input and open of the main circuit and grounding and opening of the ground circuit.

As a result, the arc-extinguishing part having the ground switch of the multi-circuit switch according to the present invention fixes the main circuit contact 31 and the ground-side contact 32 on the same axis so that the movable contact 34 moves up and down along the movable shaft 33. It is to have a structure to do the input / open of the main circuit and the ground / open of the ground circuit.

Due to the structure as described above, if the movable contact 34 is coupled with the ground side contact 32 during the cable replacement operation, the main circuit contact 31 cannot be energized, so that a complete ground state can be maintained. Safe operation is possible since it is disconnected and grounded at.

Therefore, the present invention eliminates the need for a separate grounding plug, and thus also eliminates the need for a grounding plug 13 and thus requires a connection member as shown in FIG. 4. In this case, compared with FIG. 1, it turns out that the length is short compared with the conventional connection material.

Referring to the operation of the present invention having the configuration as described above are as follows.

First, when the movable contact 34 is inserted into the lower main circuit contact 31 while moving up and down along the movable shaft 33, the movable contact 34 is energized, and the movable contact 34 is circulated. When stopped at the middle of the furnace contact 31 and the ground contact 32, the open state is maintained. In addition, the movable contact 34 enters the grounded state when the movable contact 34 is inserted into the upper ground-side contact 32.

Therefore, since the main circuit energization and grounding are made on the same axis, it is possible to completely eliminate mechanically the cause of accidents in the conventional structure which can be energized in the grounded state, and it is to be made on one axis without configuring the two contacts separately. It can be manufactured with a simple structure, even the mechanism that drives the extinguishing unit.

Therefore, the manufacturing cost of the switchgear can be reduced, and the installation space can be reduced by about 60% as shown in FIG. 5 at the time of installation, thereby having an environmentally friendly structure. That is, in the conventional case, as shown in (B) of FIG. 5, the width of the switch was required to be 1300 mm, but in the case where the present invention is applied, the width of the switch is 800 mm as shown in FIG. Will be needed.

In addition, it is possible to reduce the installation cost of the distribution line and to visually check and maintain the grounding work directly related to the worker's life.

Although the present invention has been shown and described in connection with specific embodiments, it is common practice in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended utility model claims. Anyone who has a can easily know.

As described above, the extinguishing unit having a ground switch of the multi-circuit switch of the present invention can maintain a completely grounded state at the time of a cable replacement work, and thus can be safely operated by being completely disconnected from the live part and being grounded. It has the effect of being able to relieve fear.

In addition, the main circuit energization and grounding are made on the same axis, and the grounding work can be performed without the need for a separate grounding plug. There is an effect that can reduce the installation space.

Claims (2)

A main circuit contact point and a ground-side contact point are fixedly arranged on the same axis, and a movable contact point for moving up and down along the movable axis is provided therebetween; If the ground contact is made at the time of cable replacement by operating the movable contact along the movable shaft to have three positions of energizing, opening, and grounding of the main circuit to perform the opening and closing of the main circuit and the grounding and opening of the grounding circuit. The main circuit is a sub-unit having a ground switch of the multi-circuit switch characterized in that the open state is maintained to enable safe operation. The method of claim 1, The main circuit contact and the ground-side contact is formed with a convex portion, the movable contact is characterized in that the concave portion is selectively coupled according to the convex portion and the state of the main circuit contact and the ground-side contact A subheading having a grounding switch for a multi-circuit switch.