KR20060014540A - Structure of earthing switch contact - Google Patents

Abstract

The present invention relates to a ground circuit breaker (ES) applied to a high voltage circuit breaker for a gas insulated switchgear (GIS).

The present invention improves the contact structure of the fixed contact portion and the movable contact portion of the grounding switch, and thus, the movable contact portion composed of copper-tungsten in addition to the fixed contact portion, which is the main contact portion, is melted due to the arc phenomenon during the opening and closing operation of the grounding switch. Provides the contact structure of the ground switch which maintains the stability and stability of the power system while preventing the deterioration of the contact performance due to contact wear when the short circuit current is inputted by the ground switch.

Indicator, Ground Switch, Disconnection Switch, GIS, Lever, Link

Description

Structure of earthing switch contact

1 is an overall configuration diagram of a grounding switch.

Figure 2 is an exploded cross-sectional view showing a contact structure of the conventional movable contact portion and the fixed contact portion.

Figure 3 is an exploded cross-sectional view showing a contact structure of the movable contact portion and the fixed contact portion as an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

5; First body film 9; 2nd shield

21; Bolt 22; Contact guide part

22a; First locking step 23; Fixed contact point

24; Finger coupling portion 24a; 2nd hanging jaw

25; Finger 25a; Tension part

26; Contact contact portion 27; Movable Contact

27a; Contact insert

The present invention relates to a grounding switch (ES) applied to a high-voltage circuit breaker for a gas insulated switchgear (hereinafter referred to as GIS), and more specifically, a contact point of a fixed contact portion and a movable contact portion of the ground switch. By improving the structure, the contact point of the ground switch is designed to improve the contact performance by generating the melting phenomenon by arc phenomenon at the movable contact part composed of copper-tungsten in addition to the fixed contact part as the main contact part. It is about.

The grounding switch applied to the high-voltage circuit breaker for the conventional GIS is a device that ensures safety by grounding a conductor in a voltage-free state when repairing a contact, which is composed of a structure that grounds the remaining one line during one line operation in a two-line system.

That is, as shown in FIGS. 1 and 2, the ground breaker couples the conductor 2 to the insulating spacer 1, and then attaches the fixed contact portion 3 to the conductor 2 through a bolt 3a. And a plurality of fingers 4 are coupled to the upper portion of the fixed contact portion 3 so as to surround the fixed contact portion 3, and the finger 4 is connected to the first shielding film 5. The spring 6 supported by the spring 6 is not separated from the fixed contact portion 3.

In addition, an opening 8 through which the movable contact portion 7 may pass is formed at an upper portion of the shielding film 5, and the movable contact portion when the movable contact portion 7 passes through the opening 8 is formed. (7) was to be in contact with the inner surface of the plurality of fingers (4).

In this case, the movable contact portion 7 is connected to the ground terminal 10 while being protected by the second shielding film 9.                         

In addition, the ground switch is built in the lever 11 and the operating device 12, the lever 11 and the operating device 12 is connected to the main shaft 13 for the rotational movement, the main shaft 13 It consists of a structure that is connected to the insulating operating rod 14 for driving the movable contact portion 7 while performing a linear movement by the rotational movement of the main shaft (13).

On the other hand, when the grounding switch having the above structure is opened, the grounding device needs the ability to open and close the grounding device because an electromagnetic induction current or an electrostatic induction current flows from the operating circuit, and this may cause a grounded sound line to be grounded due to malfunction. This is because the short-circuit current input capability is necessary in consideration of the short-circuit current flowing.

That is, the short-circuit current input capability of the ground switch is required to ensure the short-circuit current input capability of the ground switch (LINE side ground switch) according to the possibility of incorrect operation in the live state. This is because the contact of the ground switch should open and close smoothly without melting.

To this end, conventionally, the mechanism of the grounding switch that requires a closing capacity has been applied to the motor spring method to minimize the melting time by minimizing the closing time to increase the speed.

However, the conventional ground switch has a simple design only with the contact structure of the fixed contact section 3 and the movable contact section 7, so that the short-circuit current input performance of the ground switch is affected when the drive system is operated. Due to the melting phenomenon of the main contact, that is, the fixed contact portion (3) due to the arc phenomenon that can cause the problem that the input performance of the short-circuit current which is the main task of the grounding switch is reduced.                         

In particular, judging the input performance of the grounding switch should be no damage to the contact point after the input, and the appropriate operation should be made in the opening and closing situation, if the melting phenomenon occurs severely, opening and closing operation of the grounding switch as shown in FIG. Unable to follow.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, the present invention, by improving the contact structure of the fixed contact portion and the movable contact portion of the grounding switch, the melting phenomenon by the arc phenomenon during the opening and closing operation of the grounding switch Is generated at the movable contact part composed of copper-tungsten in addition to the fixed contact part, which is the main contact part, so that the reliability of the power system can be maintained and stabilized while preventing the deterioration of the contact performance due to contact wear when the short-circuit current is input by the ground switch. The purpose is to provide a contact structure of a grounding switch.

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

3 is an exploded cross-sectional view illustrating a contact structure of a movable contact portion and a fixed contact portion according to an embodiment of the present invention.

As shown in FIG. 3, the insulating spacer 1, the conductor 2, the first shielding film 5, the opening 8, the second shielding film 9, the ground terminal 10, and the lever 11 are operated. In the ground switch structure of a conventional gas insulated switchgear consisting of a combination structure of the device 12, the main shaft 13, the insulating operation rod 14,

The conductor 2 is coupled to the contact guide portion 22 having the first locking step 22a through the bolt 21,

The contact guide portion 22 includes a rod-shaped fixed contact portion 23 extending from the opening 8 of the first shielding film 5 and a finger coupling portion 24 having a second locking jaw 24a. Forming,

Finger 25 for engaging the first and second locking jaws 22a and 24a is formed on the contact guide part 22 and the finger coupling part 24 while forming a tension part 25a inclined at a predetermined inclination angle. Combine,

In the tension part 25a, a contact contact part 26 is formed to space the finger 24 and the first shielding film 5 at a predetermined distance.

The contact insertion part into which the fixed contact part 23 is inserted into the ground terminal 10 to allow contact with the fixed contact part 23 while making contact with the outer surface of the tension part 25a and the contact contact part 26. A movable contact portion 27 made of copper-tungsten material having a 27a is connected.

Hereinafter, the same parts as those of the components of FIG. 1 described above will be denoted by the same reference numerals and description thereof will not be repeated.

Referring to Figures 1 and 3 attached to the operation of the embodiment of the present invention configured as described above are as follows.

First, when the electric motor of the operating device 12 is rotated, the rotational force of the electric motor compresses the spring through the gear.

At this time, the compressed spring is to generate a repulsive force out of the center line position, the movement of the main shaft 13 and the lever 11 of the grounding switch is generated from the repulsive force.

And, the movement of the lever 11 is converted into a linear motion by the link mechanism is transferred to the insulating operating rod 14,

The insulating operation rod 14 drives the movable contact portion 27 connected to the ground terminal 10 while forming the contact insertion portion 27a, thereby connecting the fixed contact portion 23 to the contact insertion portion 27a. Will be inserted.

That is, the contact guide portion 22 having the first locking step 22a is coupled to the conductor 2 through the bolt 21, and the opening of the first shielding film 5 is connected to the contact guide portion 22. 8) the contact guide portion 22 and the finger coupling portion 24 in a state in which the rod-like fixed contact portion 23 and the finger coupling portion 24 having the second locking jaw 24a are coupled to each other. The first and second locking jaws 22a and 24a of the bar are coupled with the finger 25 having the tension portion 25a formed therein.

The contact insertion portion 27a of the movable contact portion 27 when the movable contact portion 27, which is movable by the insulating operating rod 14, passes through the opening 8 formed in the first shielding film 5. In the furnace, a rod-shaped fixed contact portion 23 is inserted to perform a contact operation, and short-circuit current can be supplied from the contact operation.

At this time, the arc phenomenon generated at the same time as the input of the short-circuit current is generated in the contact insertion portion 27a of the movable contact portion 27 into which the fixed contact portion 23 is inserted in addition to the fixed contact portion 23. It is possible to disperse the melting phenomenon due to the arc phenomenon during the contact operation between the fixed contact portion 23 and the movable contact portion 27, which is to prevent the wear of the contact as well as damage to the fixed contact portion 23, the ground switch It is possible to improve the input performance of the short-circuit current for the opening and closing of the.

Here, the tension portion 25a of the finger 24, which has a predetermined angle of inclination on the outer circumferential surface of the movable contact portion 27, to which the contact contact portion 26 is coupled to the end portion, comes into close contact with the tension portion 25. By the 25a, the movable contact portion 27 can maintain the contact operation with the fixed contact portion 23 firmly.

As described above, the present invention improves the contact structure of the fixed contact portion and the movable contact portion of the ground switch, thereby enabling the melting phenomenon caused by the arc phenomenon during the opening / closing operation of the ground switch, which is composed of copper-tungsten in addition to the fixed contact portion as the main contact portion. It provides the effect of securing the reliability and stabilization of the power system while preventing the deterioration of contact performance due to contact wear when the short circuit current is input by the ground switch.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are within the scope of the claims.

Claims (1)

In the ground switch structure of a conventional gas insulated switchgear composed of a coupling structure of an insulating spacer, a conductor, a first shielding film, an opening, a second shielding film, a ground terminal, a lever, an operating device, a main shaft, and an insulating operating rod, Coupling the contact guide portion having a first locking step to the conductor through the bolt, The contact guide portion has a rod-shaped fixed contact portion extending from the opening of the first shielding film and a finger coupling portion having a second locking jaw, The contact guide portion and the finger coupling portion is coupled to the engaging finger to the first and second locking jaws while forming a tension portion inclined at a predetermined inclination angle, The tension part may include a contact contact part spaced apart from the finger and the first shielding film by a predetermined distance. The ground terminal is connected to the outer surface of the tension portion and the contact contact portion, and the movable contact portion made of copper-tungsten material which forms a contact insertion portion into which the fixed contact portion is inserted to enable contact with the fixed contact portion. Contact structure of grounding switch.

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