KR101460299B1 - Gas Insulated Circuit-breaker using gas vent guide - Google Patents

Abstract

The present invention discloses a gas insulated circuit breaker to which a gas discharge guide is applied. In the gas insulated circuit breaker according to the present invention, a tube is formed inside the main contact point of the fixed part, (SF6) generated during the shutdown operation to the discharge port of the fixing part side, thereby preventing the arc contact and the main welding point, which are components applied to the gas insulated circuit breaker, from being sputtered The compressed gas is discharged to the outside of the shield by guiding the compressed gas, which is high in temperature by the tube, from the downstream end of the discharge nozzle to the shield of the fixing unit, The shield internal structure of the high-temperature compressed gas So that the insulation recovery performance is maintained constant.

Description

[0001] The present invention relates to a gas insulated circuit breaker using a gas vent guide,

The present invention relates to a gas insulated switchgear, and more particularly, to a gas insulated switchgear which is capable of electrically separating and contacting a moving part and a fixing part during an opening and closing operation of a gas insulated switchgear, The present invention relates to a gas-insulated circuit breaker, and more particularly, to a gas-insulated circuit breaker in which a gas discharge guide portion that maintains a constant insulation recovery performance of a high-temperature compressed gas while preventing a problem of sputtering components applied to the gas-

In general, the gas insulated breaker is applied to the transmission and substation systems to protect the power system by safely shutting off the current in the event of an opening or closing of the load or an occurrence of an accident such as a ground fault and a short circuit. The fixed part 10 includes a fixed part 10 and a movable part 20. The fixed part 10 includes a first arc contact 11 and a first main contact 12 for inducing generation of an arc.

The movable part 20 is moved to the fixed part 10 by the piston 51 to open and close the movable part 20 to induce an arc in correspondence with the first arc contact 11 of the fixed part 10 A second arc contact 21 and a second main contact 22 corresponding to the first main contact 12.

At this time, the fixing part 10 and the movable part 20 are enclosed by a shield 40, and the shield 40 is connected to the first arc contact 11 and the second arc contact 21, .

The second arc contact 21 and the piston 51 are formed in a cylinder 50 filled with a high-temperature gas in a compressed state. The outlet of the cylinder 50 is connected to a nozzle (52) are formed.

In the conventional gas insulated breaker, a gap between the first main contact 12 of the fixing part 10 and the second main contact 22 of the movable part 20 or between the first arc contact 11 and the second arc contact 21) so as to insulate the gaps of the insulating supports (60).

However, in the conventional gas insulated circuit breaker, as shown in FIGS. 1 and 2, when the fault current is cut off, the high-temperature compressed gas SF6 passes through the path from b1 to b2 in the downstream field A of the nozzle 52, The high temperature compressed gas discharged through the nozzle is discharged to the downstream section A of the nozzle 52 through the discharge port 13 provided in the nozzle section 10, The first main contact point 12 as well as the first arc contact 11, which is a close-off part disposed close to the first main contact point 11, is disadvantageously affected by the change of the insulation recovery characteristic according to the cooling performance of the high- .

Accordingly, in order to increase the lifetime of the circuit breaker and ensure the shutoff performance, it is necessary to effectively manage the high-temperature compressed gas flow generated during the shutdown.

However, in the conventional gas insulated circuit breaker, a method of increasing the distance between the fixing portion 10 and the moving portion 20 and the length of the structure is generally used, and a high temperature compression which is discharged to the downstream portion A of some nozzles 52 There is a case where the cooling structure is provided on the side of the fixing part 10 for forced cooling of the gas. However, since the discharged high temperature compressed gas directly contacts the first main contact 12 on the side of the fixing part 10, The first arc contact 11 and the first main contact 12, which are disposed close to the downstream field A of the high-temperature compressed gas 52, are spun to shorten the parts life span, .

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a gas insulated switchgear, Of course, by effectively guiding the flow of high-temperature compressed gas (eg SF6) generated in the shutdown operation to the discharge port of the fixing part, it is possible to prevent the arc contact and the main welding point, In particular, the high-temperature compressed gas is guided from the downstream end of the discharge nozzle to the inside of the shield of the fixing unit, and then discharged to the outside of the shield, so that the high- By being able to be cooled preferentially by the shield internal structure, the insulation recovery performance of the hot compressed gas To provide a gas-insulated circuit breaker is applied to a gas discharging guide so as to be maintained constant with that purpose.

The gas insulated breaker to which the gas discharge guide of the present invention for achieving the above object is applied includes a fixing part including a first arc contact, a first main contact and an outlet, and a fixing part including a first arc contact and a second main contact, A second arc contact and a second main contact, wherein the fixed portion and the movable portion are configured to be enclosed by a shield to attenuate a potential difference generated at the first arc contact and the second arc contact, Wherein the moving part has a cylinder and a piston which are filled with a high-temperature gas in a compressed state, and a nozzle for gas ejection is formed on an outlet side of the cylinder, The high-temperature compressed gas flow discharged to the downstream side through the nozzle is guided to the inside of the one-way contact through the shield of the fixing portion to the discharge port It is configured combined gas discharge guide portion.

The gas discharge guide portion is a tube having a predetermined length. The outer surface on the tip side of the tube is in contact with the inner side of the first main contact. The inner surface of the tube is provided with the gas discharge guide portion So that the end surface of the nozzle contacts without detaching.

Thus, in the present invention, the tube is formed inside the main contact point of the fixed portion so that the movable portion and the fixing portion can be electrically separated and brought into contact with each other at the time of opening and closing operation of the gas insulation breaker, Which is applied to the gas insulated circuit breaker, to prevent the arc contact and the main contact point from being sputtered, thereby extending the life of the component. Especially, when the high temperature compressed gas is exhausted by the tube, So that the high-temperature compressed gas can be cooled preferentially by the shield internal structure of the fixing part, so that the insulation recovery performance of the high-temperature compressed gas can be improved Can be expected to be maintained constant.

1 is a schematic cross-sectional view showing a state in which a conventional gas insulated breaker is inserted.
2 is a schematic cross-sectional view showing a cut-off state of a conventional gas insulated breaker.
3 to 6 are schematic cross-sectional views showing a flow of interruption operation of the gas insulated breaker according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, and parts that are the same as those in FIG. 1 and FIG. 2 will be denoted by the same reference numerals.

FIGS. 3 to 6 are cross-sectional schematic views showing the flow of the shutoff operation of the gas insulated breaker according to the embodiment of the present invention.

3 to 6, a gas insulated breaker incorporating a gas discharge guide according to an embodiment of the present invention includes a first arc contact 11, a first main contact 12, and a discharge port 13, (20) including a second arc contact (21) and a second main contact (22) corresponding to the first arc contact (11) and the first main contact (12) The fixed portion 10 and the movable portion 20 are configured to be enclosed by the shield 40 so as to attenuate a potential difference generated in the first arc contact 11 and the second arc contact 21 A cylinder 50 and a piston 51 filled with a high-temperature gas are formed in the movable part 20 side and a nozzle 52 for gas ejection is formed on the exit side of the cylinder 50 In addition to constituting a gas-insulated breaker, it is also possible that a tube-shaped gas discharge guide portion 70 is connected to the fixed portion 10 side .

That is, the gas discharge guide portion 70 is provided at a position corresponding to the high-temperature compressed gas flow (hereinafter referred to as " high-temperature compressed gas flow ") discharged from the inside of the first main contact 12 included in the fixed portion 10 to the downstream- Is guided to the discharge port (13) through the shield (40) on the side of the fixing part (10), and the front end side outer surface of the gas discharge guide part (70) is in contact with the inside of the first main contact And the end surface of the nozzle 52 is in contact with the inner surface of the gas discharge guide portion 70 without separating from the movable portion 20 when the stationary portion 10 and the movable portion 20 are separated or contacted with each other.

3, the first and second arc contacts 11 and 21 of the fixed portion 10 and the movable portion 20 are connected to the gas insulated interrupter, The first and second main contacts 12 and 22 are brought into contact with each other.

4 and 5, the separating operation of the fixed portion 10 and the movable portion 20 is progressed by the piston 52, and when the load is opened or closed, An arc is generated at the first and second arc contacts 11 and 21 of the fixed portion 10 and the movable portion 20 (portion B in FIG. 4), and the arc is generated from the generated arc to the movable portion 20 side Inside the cylinder 50, a high-temperature compressed gas in which the temperature of the insulating gas abruptly rises and pressure is increased is accumulated.

6, when the fixed portion 10 and the movable portion 20 are completely separated from each other to perform a shutoff operation, the high-temperature compressed gas accumulated in the cylinder 50 on the movable portion 20 side Is discharged to the downstream sheet (A) through the nozzle (52) which is the tip end side of the cylinder (50).

At this time, the high-temperature compressed gas discharged into the downstream portion A of the nozzle 52 is coupled to the inside of the first main contact 12 of the fixing portion 10, that is, So that the end surface of the nozzle 52 is always in contact with the inner surface of the main contact 12 in the longitudinal direction of the inner surface of the movable contact 20 when the stationary portion 10 and the movable portion 20 are separated or contacted with each other Is guided to the inside of the shield (40) surrounding the fixed portion (10) by a tube serving as a gas discharge guide portion (70) for discharging the gas through the discharge port (13) of the fixing portion do.

Accordingly, the high-temperature compressed gas does not affect the first main contact 12, thereby preventing the first main contact 12 from being sputtered by the hot compressed gas, Since the gas is discharged to the outside through the discharge port 13 on the side of the fixing part 10 through the shield 40, the high temperature compressed gas is cooled while passing through the shield 40, The insulation recovery performance with respect to the compressed gas can be kept constant.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

10; A fixing part 11; The first arc contact
12; A first main contact 13; outlet
20; A movable portion 21; The second arc contact
22; A second main contact 40; shield
50; Cylinder 51; piston
52; Nozzle 70; The gas discharge guide

Claims (2)

A movable portion including a first arc contact and a first main contact and a discharge port and a second arc contact and a second main contact respectively corresponding to the first arc contact and the first main contact, The fixed portion and the movable portion are configured to be enclosed by a shield to attenuate a potential difference generated at the first arc contact and the second arc contact. The movable portion is provided with a cylinder filled with a high- Wherein a piston is constituted and a nozzle for gas ejection is formed at an outlet side of the cylinder,
And a gas discharge guide portion for guiding the high-temperature compressed gas flow discharged to the downstream side through the nozzle to the discharge port through the shield of the fixing portion is coupled to the inside of the first main contact included in the fixing portion Gas isolator with gas discharge guide. 2. The apparatus according to claim 1, wherein the gas discharge guide portion is a tube having a predetermined length, the outer surface of the tube on the tip side is in contact with the inside of the first main contact, Wherein the end face of the nozzle is in contact with the end face of the nozzle without detaching.

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