KR20130078711A - Vacumm interrupter for vacumm circuit breaker - Google Patents

Vacumm interrupter for vacumm circuit breaker Download PDF

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Publication number
KR20130078711A
KR20130078711A KR1020110147813A KR20110147813A KR20130078711A KR 20130078711 A KR20130078711 A KR 20130078711A KR 1020110147813 A KR1020110147813 A KR 1020110147813A KR 20110147813 A KR20110147813 A KR 20110147813A KR 20130078711 A KR20130078711 A KR 20130078711A
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KR
South Korea
Prior art keywords
center shield
vacuum interrupter
inner layer
contact
movable
Prior art date
Application number
KR1020110147813A
Other languages
Korean (ko)
Inventor
김병욱
Original Assignee
엘에스산전 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 엘에스산전 주식회사 filed Critical 엘에스산전 주식회사
Priority to KR1020110147813A priority Critical patent/KR20130078711A/en
Publication of KR20130078711A publication Critical patent/KR20130078711A/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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

PURPOSE: A vacuum interrupter of a vacuum circuit breaker is provided to improve a performance of blocking high current by comprising an outer layer with an excellent heat resistance. CONSTITUTION: A vacuum interrupter (20) comprises: a movable electrode (1), a fixed electrode (3), a movable contact (2), a center shield (15), and an insulating container (6). The movable electrode and fixed electrode are arranged in the insulating container. The movable contact is attached on the end part of the fixed electrode, and attached on the end parts of a fixed contact and the movable electrode. The center shield adsorbs the steam of arc generated in the movable contact. The center shield comprises inner layers and outer layers of the movable contact and fixed contact. The insulating container is combined with upper and lower seal cups (7, 8), and the inside is maintained under a vacuumed condition.

Description

Vacuum interrupter for vacuum breaker {VACUMM INTERRUPTER FOR VACUMM CIRCUIT BREAKER}

The present invention relates to a vacuum interrupter of a vacuum interrupter, and more particularly to a center shield of a vacuum interrupter.

Vacuum circuit breaker is a circuit and device protection device that quickly disconnects the arc by extinguishing arc in vacuum interrupter during normal load opening and closing of fault current. The vacuum interrupter used as a core part of the vacuum breaker is made of an electrical insulation material such as ceramic, and it is configured to quickly extinguish the arc when opening and closing by installing a movable contact and a fixed contact in an insulation container in which the inside is kept in a vacuum state. It is used as a contact device for opening and closing a power system.

A vacuum interrupter according to an example of the prior art will be described with reference to FIGS. 1 and 2 as follows. The vacuum interrupter 20 includes a movable electrode 1, a movable contact 2, a fixed electrode 3, a fixed contact 4, a center shield 5, an insulation container 6, and an upper seal cup ( upper seal cup (7), lower seal cup (8), bellows (9) and the like.

The movable electrode 1 is formed of an electrical conductor and may be connected to a movable electrode drive shaft (not shown) to move toward the fixed contact 4 side or to move away from the fixed contact 4 side. The movable electrode (1) is a means for connecting and supporting the movable contact (2) mechanically and at the same time comprising an electrical conductor to provide an energization path through which current flowing through the movable contact (2) or current flowing from the movable contact (2) is energized. Becomes Thus, the movable electrode 1 is electrically connected to either the power supply side or the load side of the circuit of the power system. The movable contact 2 is connected to the end of the movable electrode 1.

Like the movable electrode 1, the fixed electrode 3 is mechanically supported by connecting the fixed contact 4 and is made of an electrical conductor, and the current flowing from the fixed contact 4 or the current flowing from the fixed contact 4 is energized. It is a means for providing an energization path. The fixed electrode 3 is electrically connected to the counter side of the power supply side or the load side of the circuit of the power system to which the movable electrode 1 is connected. The fixed contact 4 is a corresponding component opposed to the movable contact 2 and is connected to an end of the fixed electrode 3.

The center shield 5 is a support member as a shielding member that protects the insulating container 6 by preventing an arc generated between the contacts from being separated between the movable contact 2 and the fixed contact 4 from being transferred to the insulating container 6. It is supported by the insulated container 6 by (10).

The insulated container 6 is usually made of a material such as ceramic having excellent electrical insulation and heat resistance, and is formed in a cylindrical shape as an enclosure forming the outer shape of the vacuum interrupter 20, and the openings of the upper and lower parts are sealed by a seal cup. The interior of the insulated container 6 is maintained in a vacuum state.

The bellows 9 is installed to be connected between the lower seal cup 8 and the movable electrode 1 to allow movement of the movable electrode 1 and at the same time between the lower seal cup 8 and the movable electrode 1. Seal tightly.

In such a vacuum interrupter 20, the center shield 5 absorbs the metal vapor of the arc generated at the contact when the movable contact 2 and the fixed contact 4 are opened and quickly extinguishes the circuit and the load device from the accident current. It is an important component of the vacuum interrupter to protect it. Typically, in the prior art vacuum interrupter 20, the center shield 5 is made of metal of a single material, and is generally made of copper (Cu) or stainless steel.

However, when the center shield 5 is made of the same material, the amount of arc is small when the small current is cut off, so that the arc is deposited in the center shield 5 less. Therefore, the amount of melting of the center shield 5 by the arc is small, so that no hole is formed in the center shield 5. However, when the breaking current is 25 kA or more, the amount of deposition of the arc on the center shield 5 increases, and the center shield 5 may be melted by the arc, causing a hole. When a hole is formed in the center shield 5, the arc is not deposited in the center shield 5, but directly contacts the insulation container 6 through the through hole formed in the center shield 5, and the insulation container directly in contact with the arc ( 6) the temperature rises locally due to lack of heat transfer, which may cause cracking due to heat shock.As a result, when a crack occurs in the insulating container 6, airtightness is destroyed between the cracks and the vacuum disappears, thus functioning as a vacuum interrupter. Can be lost.

In addition, when the center shield 5 is made of stainless steel, the melting point is higher than that of copper, so there is less possibility of holes due to the arc. However, stainless steel has a significantly lower heat transfer coefficient than copper, resulting in poor adsorption of the arc, that is, metal vapor. At the current zero, the degree of vacuum is higher than that of the copper center shield, which results in a lower breaking capability.

As described above, in the vacuum interrupter 20 according to the related art, when an accident current such as a short-circuit current is energized on the circuit to be connected, the arc is generated by the arc generated between the movable contact 2 and the fixed contact 4 when the contact is opened. The shield 5 is melted to form a hole, and the arc passes through the through hole formed in the center shield to directly contact the insulated container 6, causing a thermal shock, resulting in a crack in the insulated container 6, or the center shield 5 Heat transfer through) does not occur quickly and has a problem in that the breaking ability of the vacuum circuit breaker falls.

Accordingly, an object of the present invention is to provide a vacuum interrupter of a vacuum circuit breaker having a center shield for preventing heat from melting by an arc while having good heat transfer.

The above object of the present invention,

An insulated container in which the upper and lower seal cups are coupled and the inside thereof is maintained in a vacuum state;

A fixed electrode and a movable electrode disposed in the insulated container;

A fixed contact attached to the end of the fixed electrode and a movable contact attached to the end of the movable electrode;

A center shield for adsorbing the vapor of the arc generated at the contact point;

The center shield can be achieved by providing a vacuum interrupter of a vacuum circuit breaker comprising an inner layer of a predetermined thickness disposed around the movable contact and the fixed contact and an outer layer of a predetermined thickness disposed outside of the inner layer. have.

According to the present invention, since the center shield has an inner layer having good arc adsorption capacity and an outer layer having excellent heat resistance to prevent melting by the arc, the metal vapor of the arc is rapidly adsorbed at the zero point at the time of breaking the current and the degree of vacuum It can be good to improve the blocking capability and also to reduce the possibility of hole generation by the arc, thereby preventing the performance of the vacuum interrupter.

1 is a longitudinal cross-sectional view showing the internal structure of a vacuum interrupter according to an example of the prior art,
2 is a cross-sectional view of the center shield shown in FIG.
3 is a longitudinal sectional view showing the internal structure of a vacuum interrupter according to a first embodiment of the present invention;
4 is a perspective view of a center shield according to a first embodiment of the present invention;
5 is a cross-sectional view cut away in the radial direction of the center shield according to the first embodiment of the present invention, and
6 is a cross-sectional view cut away in the radial direction of the center shield according to the second embodiment of the present invention.

The object of the present invention described above and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Regarding the configuration of the vacuum interrupter of the vacuum circuit breaker of the present invention, the description of the same or similar parts as the configuration of the vacuum interrupter of the prior art will not be described repeatedly, and only the characteristic configuration of the present invention will be described in detail.

3 is a longitudinal cross-sectional view illustrating an internal structure of a vacuum interrupter according to a first embodiment of the present invention, FIG. 4 is a perspective view of a center shield according to a first embodiment of the present invention, and FIG. 5 is a first view of the present invention. 6 is an enlarged cross-sectional view cut away in the radial direction of the center shield according to the embodiment, Figure 6 is an enlarged cross-sectional view cut away in the radial direction of the center shield according to the second embodiment of the present invention.

Referring to Figure 3 briefly described the structure of the vacuum interrupter 20 of the present invention, the movable electrode 1 and the fixed electrode (3) for the rated current, the operation to ensure the opening and closing performance and energizing the current in the normal state Couplings (2) and fixed contacts (4), the center shield (15) for absorbing the metal vapor of the arc generated when the fault current is interrupted, the insulating container (6) made of ceramic material, the upper and lower parts of the insulating container (6) Seals 7 and 8 for holding the internal vacuum of the vacuum interrupter 20, and a bellows 9 for allowing the movable electrode 1 to linearly move while maintaining the vacuum tightness inside the vacuum interrupter. In addition, an end shield (unsigned) to prevent creeping discharge inside the insulating container 6 to improve insulation performance, a bellows shield (unsigned) to protect the bellows, a movable contact 2 and a fixed contact ( 4) It is assembled at the bottom to prevent the deterioration of insulation performance due to the scattering of the metal melt generated when the accidental current is cut off, and includes a disk-shaped arc shield (unsigned) with an opening for assembly at the center.

In the vacuum interrupter of the present invention, the center shield 15 quickly adsorbs and extinguish metal vapors of the arc generated at the contacts during current switching and breaking, thereby maintaining a good vacuum degree of the vacuum interrupter at the current zero point and the arc directly It is a shielding member that shields reaching the insulated container 6. As shown in FIG. 3, the center shield 15 is disposed inside the insulated container 6 and is insulated from the insulated container 6 by the fixing member or the supporting member 10 at approximately an intermediate portion along the longitudinal direction of the insulated container 6. It is fixed to and installed at), and is spaced apart from the movable contact 2 and the fixed contact 4 by a predetermined distance to surround the circumference of the movable contact and the fixed contact in the circumferential direction.

As shown in FIG. 4, the center shield 15 installed at a predetermined distance from the movable contact 2 and the fixed contact 4 extends along the axial direction of the movable electrode 1 and the fixed electrode 3. It is an overall cylindrical shape with the upper and lower ends open.

As shown in cross-sectional view in FIG. 5, the center shield 15 according to the first embodiment of the present invention has an inner layer 15a having a predetermined thickness and an outer layer having a predetermined thickness disposed outside the inner layer 15a. It has a double wall structure composed of 15b. More specifically, the inner layer 15a of the center shield 15 to which the metal vapor of the arc is adsorbed is made of a material capable of quickly adsorbing the arc generated at the contacts during current switching and current interruption, and the center shield ( The outer layer 15b of 15 is made of a material having heat resistance. Regarding the material used for the center shield 15, in the first embodiment of the present invention, copper or a copper alloy was used for the inner layer 15a of the center shield 15, and the outer layer ( Stainless steel was used for 15b).

As such, the respective materials used for the center shield 15 having the multilayer structure of the inner layer 15a and the outer layer 15b having different materials may be joined in various ways. For example, the inner layer and the outer layer may be bonded by hot rolling of the base material and the cladding material, and the inner layer 15a and the outer layer 15b of the center shield 15 may face substantially without a gap. I'm in contact. The sheet metal of the dissimilar metal made of copper or copper alloy and stainless steel thus hot-rolled and joined is formed into a pipe shape in a forming die according to a method known in the art of manufacturing pipes using plate material, and then the pipe shape is opened. The open ends are welded to form a cylindrical center shield while the ends are fixed against each other.

On the other hand, in relation to the thickness of the center shield, if the thickness of the center shield 15 is too thin, the center shield may be easily melted due to the high heat generated by the arc formed between the movable contact 2 and the fixed contact 4. Not only this, but also the role as a shielding member which cuts off the heat shock to the insulating container 6 cannot be fully exhibited. On the contrary, if the thickness of the center shield is too thick, problems such as installation space related to other components inside the vacuum interrupter, correlation with other components due to weight increase, and cost increase may occur. Accordingly, the thickness of the inner layer 15a and the outer layer 15b in the center shield 15 according to the first embodiment of the present invention is about 1.5 mm, respectively. If necessary, the total thickness of the center shield 15, which is the sum of the thickness of the inner layer 15a of the center shield 15 and the thickness of the outer layer, may be selected in the range of approximately 1 to 3 mm. Further, preferably, the thickness of the inner layer 15a of the center shield 15 is approximately 0.5-1.5 mm, and the thickness of the inner layer 15a of the center shield 15 and the thickness of the outer layer 15b are the same. Naturally, various combinations of the thicknesses of the inner layer 15a and the outer layer 15b having the same thickness in the range of 1 to 3 mm in the total thickness of the center shield 15 are possible.

6 shows in cross section a center shield 15 of a vacuum interrupter according to a second embodiment of the invention. The center shield in the second embodiment is located between the inner layer 25a and the outer layer 25a 'of a predetermined thickness made of copper or copper alloy and between the inner layer 25a and the outer layer 25a' and made of stainless steel. It consists of a triple-walled multilayer structure including the intermediate layer 25b of predetermined thickness. Also in the second embodiment, the total thickness of the center shield 25, which is the sum of the thickness of the inner layer 25a, the thickness of the outer layer 25a ', and the thickness of the middle layer 25b of the center shield 25, is approximately 1 to 3 mm. to be. And, preferably, the thickness of the inner layer 25a of the center shield 25, the thickness of the outer layer 25a 'and the thickness of the intermediate layer 25b are the same. Similarly, in the second embodiment, various combinations of the thicknesses of the inner layer 25a, the outer layer 25a 'and the intermediate layer 25b of the same thickness in the entire thickness range of the center shield 25 are possible.

Although the thicknesses of the inner and outer and middle layers of the center shield are described in the examples as being the same, in a variant embodiment the thickness of the inner layer of the center shield is greater than the thickness of the outer layer (center shield with double wall structure) or It is conceivable to make the thickness of the inner and outer layers of the center shield larger than the thickness of the intermediate layer (center shield of the triple wall structure). Therefore, it is apparent to those skilled in the art that other modified embodiments in which the thicknesses of the inner layer, outer layer and intermediate layer are different from each other within the scope of the present invention are possible, and such modified embodiments are included in the present invention.

1: movable electrode 2: movable contact
3: fixed electrode 4: fixed contact
5, 15: center shield 6: insulated container
7: upper thread cup 8: lower thread cup
9: bellows 10: support member
15a: inner layer 15b: outer layer
20: vacuum interrupter

Claims (8)

An insulated container in which the upper and lower seal cups are coupled and the inside thereof is maintained in a vacuum state;
A fixed electrode and a movable electrode disposed in the insulating container;
A fixed contact attached to an end of the fixed electrode and a movable contact attached to an end of the movable electrode;
And a center shield for absorbing the vapor of the arc generated at the contact point.
And the center shield includes an inner layer having a predetermined thickness disposed around the movable contact and the fixed contact point, and an outer layer having a predetermined thickness disposed outside the inner layer. The vacuum interrupter of claim 1, wherein the inner layer and the outer layer of the center shield are in surface contact. 3. The vacuum interrupter of claim 2, wherein the inner layer of the center shield is made of copper or copper alloy. 3. The vacuum interrupter of claim 2, wherein the outer layer of the center shield is made of stainless steel. 3. The vacuum interrupter of claim 2, wherein the center shield is joined by hot rolling. The vacuum interrupter of any one of claims 1 to 6, wherein the total thickness of the center shield is 1 to 3 mm. The vacuum interrupter of any one of claims 1 to 6, wherein the thickness of the inner layer of the center shield is 0.5 to 1.5 mm. 2. The center shield of claim 1, wherein the center shield is located between an inner layer having a predetermined thickness disposed around the movable contact and the fixed contact, an outer layer having a predetermined thickness disposed outside the inner layer, and between the inner layer and the outer layer. The vacuum interrupter of the vacuum circuit breaker, characterized in that it comprises an intermediate layer of a predetermined thickness.
KR1020110147813A 2011-12-30 2011-12-30 Vacumm interrupter for vacumm circuit breaker KR20130078711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110147813A KR20130078711A (en) 2011-12-30 2011-12-30 Vacumm interrupter for vacumm circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110147813A KR20130078711A (en) 2011-12-30 2011-12-30 Vacumm interrupter for vacumm circuit breaker

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9972466B2 (en) 2016-04-05 2018-05-15 Lsis Co., Ltd. Vacuum interrupter for a vacuum circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9972466B2 (en) 2016-04-05 2018-05-15 Lsis Co., Ltd. Vacuum interrupter for a vacuum circuit breaker

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