KR20150012468A - Circuit breaker of gas insulation switchgear - Google Patents

Circuit breaker of gas insulation switchgear Download PDF

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Publication number
KR20150012468A
KR20150012468A KR1020130088010A KR20130088010A KR20150012468A KR 20150012468 A KR20150012468 A KR 20150012468A KR 1020130088010 A KR1020130088010 A KR 1020130088010A KR 20130088010 A KR20130088010 A KR 20130088010A KR 20150012468 A KR20150012468 A KR 20150012468A
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KR
South Korea
Prior art keywords
contact
main contact
protection tip
arc
finger
Prior art date
Application number
KR1020130088010A
Other languages
Korean (ko)
Inventor
김형춘
Original Assignee
현대중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020130088010A priority Critical patent/KR20150012468A/en
Publication of KR20150012468A publication Critical patent/KR20150012468A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/0358—Connections to in or out conductors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

The present invention relates to a circuit breaker of a gas insulation switchgear. More particularly, disclosed is a gas insulation switchgear which has a structure for preventing damage due to the generation of arc in a main contact point by the error of an arc contact point. In a circuit breaker of a gas insulation switchgear which includes a conductor part of a moving part side, a conductor part fixing part side, and a moving rod part which moves between them and changes an input state and a blocking state, a circuit breaker of a gas insulation switchgear includes a main contact point of a moving rod part which provides a path for transmitting a constant current and a finger contact point of the conductor part of the fixing part side. It includes a main contact protection tip which has a surface which faces the finger contact point of the conductor part of the fixing part side separated from the main contact point of the moving rod part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a breaker of a gas insulated switchgear,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker of a gas insulated switchgear, and more particularly to a circuit breaker of a gas insulated switchgear having a structure capable of preventing damage caused by an arc at a main contact due to an abnormality of an arc contact will be.

The Gas Insulated Switchgear (GIS) is a gas insulated switchgear (GIS) that houses switchgear, breaker, switchgear, transformer, lightning arrester, and main circuit bus in a metal tank. The live part is supported by a solid insulator (Spacer) It is an opening / closing facility system filled with SF6 gas which is excellent in performance and SOHO capability as an insulation medium and sealed.

The main devices of internal pressure of GIS are gas breakers, disconnectors, folding switches, lightning arresters, potent transformers, and current transformers.

The operational responsibilities of the circuit breakers used in GIS are in accordance with the IEC standard. O-0.3s-CO-3min-CO '.

Basically, the circuit breaker requires two times of breaking performance within 0.3 seconds. The first shutdown obligation is due to the fact that SF6 gas is carried out in the state of cold gas, so the shut-off performance is excellent. At the time of shutdown, the arc that occurs causes the surrounding SF6 to rise from 20,000 to 30,000 degrees in a short time. The second blocking obligation after 0.3 seconds is to shut off with the high temperature and high pressure inside the blocking part. The SF6 gas at a high temperature has a drastically reduced breaking performance, making it difficult to cut off the breakdown current.

Related Prior Art Korean Patent Laid-Open No. 10-2006-0116567 (published on Nov. 15, 2006) has a high-voltage arc extinguishing device having a suction suction unit.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas insulated switchgear which is capable of operating normally when an arc arises between a movable main contact and a stationary finger contact when the movable arc contact and the stationary arc contact are largely worn due to frequent opening and closing of the gas- And a circuit breaker of the gas insulated switchgear having a structure that does not interfere with current conduction.

The present invention relates to a circuit breaker of a gas insulated switchgear comprising a movable portion side conductor portion, a fixed portion side conductor portion, and a movable rod portion for switching between a closed state and a closed state by moving between them, And the main contact of the movable rod portion has a main contact protection tip which forms a surface facing a finger contact of the separated fixed side conductor portion, characterized in that the main contact point of the movable rod portion has a main contact protection tip A breaker of a gas insulated switchgear is provided.

The main contact protection tip is preferably made of a refractory metal material having conductivity and melting point higher than copper.

It is further preferable that the main contact protection tip of the movable rod portion does not come into contact with the finger contact of the fixed side conductor portion in the closed state.

The main contact protection tip may have a fan shape or an elliptical shape in cross section.

The present invention also provides a circuit breaker for a gas insulated switchgear comprising a movable portion side conductor portion, a fixed portion side conductor portion, and a movable rod portion for switching between a closed state and a closed state, And the movable contact main contact and the fixed finger contact are provided with a main contact protection tip and a finger contact protection tip on the surfaces facing each other in a cutoff state, The present invention also provides a circuit breaker for a gas insulated switchgear.

The main contact protection tip and the finger contact protection tip may be formed of a refractory metal material having conductivity and higher melting point than copper. The main contact protection tip and the finger contact protection tip may be in contact with the counter contact .

The breaker of the gas insulated switchgear according to the present invention is provided with a protection tip at the main contact even if an arc occurs at the main contact due to wear of the arc contact or the like so that the main contact is prevented from being damaged.

Therefore, even if an arc is generated at the main contact, there is an effect that the normal current through the main contact is not interrupted.

1 is a sectional view showing the structure of a circuit breaker provided in a gas insulated switchgear,
Fig. 2 is a sectional view showing a state in which a circuit breaker is charged,
3 is a cross-sectional view showing a cut-off state of the breaker,
4 and 5 are views showing a main contact and a finger contact of the circuit breaker according to the first embodiment of the present invention,
6 and 7 are views showing a main contact and a finger contact of the circuit breaker according to the second embodiment of the present invention,
8 is a view showing a finger contact of the circuit breaker according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A circuit breaker of a gas insulated switchgear for preventing arc damage of a main contact according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a circuit breaker provided in a gas insulated switchgear, FIG. 2 is a sectional view showing a state where a circuit breaker is inserted, and FIG. 3 is a sectional view showing a cut-off state of the circuit breaker.

1, the breaker of the gas insulated switchgear includes a movable portion 10 on the left side of the drawing, a fixed portion 20 on the upper side of the drawing, And includes a movable rod portion 30 as shown.

In the assembled state, the movable rod portion 30 slides while being coupled to the movable portion side conductor portion 10, and switches between the closing state and the closing state as shown in FIGS. 2 and 3.

The movable rod portion 30 and the movable portion side conductor portion 10 maintain the electrically connected state regardless of the moving position of the movable rod portion 30 but the movable rod portion 30 and the fixed portion side conductor portion 20 Is different depending on the position of the movable rod portion 30.

With reference to FIG. 2, the charging state will be described.

The finger contacts 22 of the fixed portion side conductor portion 20 are connected to the main contact point 32 of the movable rod portion 30 and the fixed arc contacts 24 of the fixed portion side conductor portion 20 are connected to the movable Is connected to the movable arc contact (34) of the rod section (30). Therefore, the fixed portion side conductor portion 20 and the movable portion side conductor portion 10 are connected through the movable rod portion 30. The steady state current in the loaded state flows mainly through the finger contact 22 and the main contact 32. [

The process of switching from the closing state as shown in FIG. 2 to the blocking state as shown in FIG. 3 will be described.

When the operating shaft 31 pulls the movable rod portion 30 downward, the main contact 32 and the finger contact 22 are first separated and then the fixed arc contact 24 and the movable arc point 34 Separated. An arc is generated when the fixed arc contact 24 and the movable arc contact 34 are separated.

SF6 gas is used to shut off the arc generated.

SF6 is stored in the pressure chamber 42 and is compressed by the piston 45 as the movable rod portion 30 moves to the movable portion side conductor portion 20. [ When the compressed SF6 gas reaches a predetermined pressure or higher, it moves to the heat chamber 44 and is injected into the nozzle unit 50. [

The nozzle unit 50 is formed to surround the movable arc contact 34 of the movable rod unit 30. The nozzle unit 50 includes a main nozzle 52 and an auxiliary nozzle 54. SF6 gas is injected at an interval between the main nozzle 52 and the auxiliary nozzle 54. [

The SF6 gas accumulated in the heat chamber 44 is injected to extinguish the arc through the nozzle unit 50. The SF6 gas injected due to the arc generated at the time of the shutoff becomes high temperature and high pressure, A supersonic flow is generated in the conductor portion 10 on the movable portion side. At this time, the insulation performance of SF6 gas at a high temperature drops sharply, and a gas having a low insulation performance may cause dielectric breakdown between the ground and the ground.

When the movable arc contact 34 and the fixed arc contact 24 are abraded due to frequent opening and closing operations of the gas insulated switchgear installed in a substation or the like, The main contact 32 and the finger contact 22 are not damaged by the arc even if an arc is generated between the finger contacts 22 so that no problem arises in the energization of the normal current.

The fixed arc contact 24 and the movable arc contact 34 are brought into contact with each other after the main contact 32 and the finger contact 22, which energize the steady state current, Is physically deteriorated. When the arc contacts 24 and 34 are separated from each other, an arc is generated due to the voltage. Although the arc contacts 24 and 34 are physically separated by the generated arc, It is possible to conduct current flow.

The arc contacts 24 and 34 are not intended for flowing a normal current but are a contact for enduring an arc generated in a break.

On the other hand, when the main contact point 32 and the finger contact point 22, which are supplied with a steady current, are damaged due to the arc, there arises a problem of energizing the steady current when switching to the input state.

The present invention is intended to provide a structure in which the main contact 32 and the finger contact 22 perform a basic function of conducting a normal current and are not damaged even if an arc is generated between them.

4 and 5 are views showing a main contact point and a finger contact point of the circuit breaker according to the first embodiment of the present invention. FIG. 4 shows a state in which the breaker is closed, and FIG. 5 shows a state in which the main contact point and the finger contact point are separated will be.

The breaker of the gas insulated switchgear according to the first embodiment of the present invention is characterized in that the main contact point protective tip 130 is provided at the main contact point 32 of the movable rod part 30. [

The main contact protection tip 130 is provided to form a surface facing the finger contact 22 of the separated fixed-side conductor portion 20 in the cut-off state as shown in Fig.

When an arc is generated between the main contact 32 and the finger contact 22, the arc is formed in a direction having the shortest path therebetween (closest to each other), so that the main contact protective tip 130 is spaced apart from the finger Thereby forming a surface close to the contact point 22.

In the drawing, an arrow indicates the path of the main current. In the energized state, current flows to the finger contact 22 through the main contact 32. When the main contact 32 and the finger contact 22 are separated from each other, Arc flows through the arc contacts 24 and 34 and an arc arises between the arc contacts 24 and 34 at the moment when the arc contacts 24 and 34 are separated.

4, the main contact point 32 and the finger contact point 22 are made of a metal material having excellent electric conductivity because a steady-state current must flow therethrough. Preferably, copper or a copper alloy material is used.

However, in the case of a copper or copper alloy material, it may be damaged by an arc when an arc is generated. Therefore, it is preferable to use a refractory metal material having a melting point higher than that of a copper or copper alloy material.

The high melting point metal material is generally a metal having a melting point higher than that of the melting point of iron (1535) and is composed of tungsten (melting point 3400 ° C), rhenium (3,147 ° C), tantalum (2,850 ° C), molybdenum (2,620 ° C) 1,900 ° C), and titanium (1,800 ° C).

In the present specification, the high-melting point metal material is meant to include both of these metallic pure materials and alloys containing these metals as a main component. More specifically, as the material of the main contact protection tip 130, a tungsten alloy having the highest melting point can be used.

The main contact protection tip 130 is not formed to be coated only on the surface but has a constant cross sectional area. In the illustrated embodiment, the main contact protection tip 130 has a fan-shaped cross-section, but the main contact protection tip 130 may have an elliptical cross-section. If the coating is formed only on the surface, the main contact protection tip may be peeled off due to the heat energy generated from the arc, and in this case, the function may not be performed.

Therefore, it is preferable that the main contact protection tip 130 has a length t in the thickness direction of 2 mm or more. If the thickness is less than 2 mm, peeling problems due to arcing may occur.

Since the main contact protection tip 130 uses a metal material having a melting point higher than that of copper, the main contact protection tip 130 has a lower electrical conductivity than copper. Therefore, it is preferable that no current flows into the main contact protection tip 130 in the closing state. To this end, the main contact protection tip 130 is preferably formed at a portion not in contact with the finger contact 22 in the closed state.

6 and 7 are views showing a main contact and a finger contact of the circuit breaker according to the second embodiment of the present invention, in which FIG. 6 shows the charging state and FIG. 7 shows the blocking state.

The circuit breaker according to the second embodiment of the present invention has a main contact protection tip 130 at the main contact 32 and a finger contact protection tip 120 at the finger contact 22 as well.

In the case of the finger contact 22, the damage due to the arc is less than the main contact 32 due to its radially arranged nature. However, since the finger contact 22 can not be free from damage by the arc, the finger contact protection tip 120 is provided.

Like the main contact protection tip, the finger contact protection tip 120 is preferably made of a refractory metal, and is preferably formed in a shape having a constant cross-sectional area rather than being formed only on the surface.

The material and the cross-sectional shape of the finger contact protection tip 120 are the same as those of the main contact protection tip 130, so duplicate explanation is omitted.

8 is a view showing finger contacts of a circuit breaker according to a second embodiment of the present invention.

The finger contact 22 is formed on the front and rear sides of the flat portion 22a in contact with the main contact 32 and the sliding contact of the finger contacts 22 is smooth Round portions 22b and 22c are formed in front of and behind the flat portion 22a.

Due to such a shape, the round portions 22b and 22c do not contact the main contact 32. [

Here, it is preferable that the finger contact protection tip 120 is formed in the round portion 22b. The finger contact protection tip 120 is preferably made of a metal having a higher melting point than that of the conductive material and has a higher resistance than the finger contact. Therefore, the finger contact protection tip 120 is preferably formed on the rounded portion 22b that does not contact the main contact 32.

When the current flows through the finger contact protection tip 120, the resistance is high and is not good, so that current does not flow through the finger contact protection tip 120 in the closing state.

As described above, the breaker of the gas insulated switchgear according to the present invention has the effect of preventing the main contact and the finger contact from being damaged by the arc even if an arc occurs between the main contact and the finger contact due to wear of the arc contact .

In addition, the main contact protection tip and the finger contact protection tip of the circuit breaker according to the present invention are formed so that current does not flow in a charged state, so that there is no hindrance in flowing a normal current in a charged state.

10: movable part side conductor part
20: Fixing portion side conductor portion
22: Finger contact
22a:
22b, 22c:
30: movable rod section
32: Main contact
120: Finger contact protection tips
130: Main contact protection tips

Claims (8)

A movable portion side conductor portion, a fixed portion side conductor portion, and a movable rod portion that is moved between the closed state and the closed state to switch between the closed state and the closed state,
A main contact of the movable rod portion providing a path for conducting a normal current and a finger contact of the fixed portion side conductor portion,
Wherein the main contact of the movable rod portion comprises a main contact protection tip forming a surface facing a finger contact of the separated fixed portion side conductor portion.
The method according to claim 1,
Wherein the main contact protection tip is made of a refractory metal material having conductivity and melting point higher than that of copper.
The method according to claim 1,
And the main contact protection tip of the movable rod portion does not contact the finger contact of the fixed side conductor portion in the closed state.
4. The method of claim 3,
Wherein the main contact protection tip has a sectional shape of a fan shape or an elliptical shape.
A movable portion side conductor portion, a fixed portion side conductor portion, and a movable rod portion that is moved between the closed state and the closed state to switch between the closed state and the closed state,
A main contact of the movable rod portion providing a path for conducting a normal current and a finger contact of the fixed portion side conductor portion,
Wherein the movable contact main contact and the fixed finger contact are provided with a main contact protection tip and a finger contact protection tip on a surface facing each other in a cut-off state.
6. The method of claim 5,
Wherein the main contact protection tip and the finger contact protection tip are made of a refractory metal material having conductivity and melting point higher than that of copper.
6. The method of claim 5,
Wherein the main contact protection tip and the finger contact protection tip do not contact the counter contact in a closed state.
The method of claim 5,
Wherein the main contact protection and the finger contact protection tip have a fan shape or a elliptical shape in section.
KR1020130088010A 2013-07-25 2013-07-25 Circuit breaker of gas insulation switchgear KR20150012468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130088010A KR20150012468A (en) 2013-07-25 2013-07-25 Circuit breaker of gas insulation switchgear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130088010A KR20150012468A (en) 2013-07-25 2013-07-25 Circuit breaker of gas insulation switchgear

Publications (1)

Publication Number Publication Date
KR20150012468A true KR20150012468A (en) 2015-02-04

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Family Applications (1)

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KR1020130088010A KR20150012468A (en) 2013-07-25 2013-07-25 Circuit breaker of gas insulation switchgear

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KR (1) KR20150012468A (en)

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