KR101752301B1 - Structure of insulation barrier for circuit breaker - Google Patents

Structure of insulation barrier for circuit breaker Download PDF

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Publication number
KR101752301B1
KR101752301B1 KR1020150187785A KR20150187785A KR101752301B1 KR 101752301 B1 KR101752301 B1 KR 101752301B1 KR 1020150187785 A KR1020150187785 A KR 1020150187785A KR 20150187785 A KR20150187785 A KR 20150187785A KR 101752301 B1 KR101752301 B1 KR 101752301B1
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KR
South Korea
Prior art keywords
insulating
insulating barrier
slot
insulation
cover
Prior art date
Application number
KR1020150187785A
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Korean (ko)
Inventor
이재용
Original Assignee
엘에스산전 주식회사
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Priority to KR1020150187785A priority Critical patent/KR101752301B1/en
Application granted granted Critical
Publication of KR101752301B1 publication Critical patent/KR101752301B1/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
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/12—Means for earthing parts of switch not normally conductively connected to the 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
    • H02B13/0354—Gas-insulated switchgear comprising a vacuum switch

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

The present invention relates to an insulation barrier assembly structure of a circuit breaker in which an insulation barrier for insulation between phases of a circuit breaker can be installed directly on an insulation cover.
In order to achieve the above object, the present invention provides an insulation cover for insulation of a main circuit, a first terminal connected to the power source side exposed to the outside through a terminal hole formed in the insulation cover, a second terminal connected to the load side, And an insulating barrier detachably coupled to the insulating cover so as to isolate the two terminals of the circuit breaker from each other.

Description

[0001] STRUCTURE OF INSULATION BARRIER FOR CIRCUIT BREAKER [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation barrier of a circuit breaker, and more particularly, to an insulation barrier assembly structure of a circuit breaker in which an insulation barrier for insulation between phases of a circuit breaker can be installed directly on an insulation cover.

The circuit breaker is an electric device that cuts off the current flow to prevent accidents when the current overflows in the circuit, and various kinds of circuit breakers such as a vacuum circuit breaker and an air circuit breaker, depending on the size of the applied voltage, exist.

These circuit breakers require interphase insulation of the external terminals exposed to the outside for the protection of the circuit. For this purpose of isolation, the external terminals between the three phases, namely RST, are provided with insulating barriers.

Hereinafter, a description will be given of an insulating barrier according to the related art by taking an example in which an insulating barrier is applied to a vacuum circuit breaker for the sake of understanding.

Vacuum circuit breaker is a product that protects people and load devices by breaking the circuit in vacuum interrupter inside vacuum circuit breaker when abnormal current such as overcurrent, short circuit and ground fault of extra high voltage / high voltage distribution line occurs.

Such a vacuum circuit breaker is installed together with a switchboard for inserting and managing various electric devices including a breaker for operation and control of a power plant and a substation, and for operation of an electric motor, and is generally stored in a cradle fixed to the switchboard .

1 is a perspective view of a vacuum circuit breaker according to the related art. Referring to FIG. 1, a vacuum circuit breaker 10 includes frames 11 and 12, a main circuit unit 20, an opening / closing mechanism And a control device (not shown) for controlling the opening / closing mechanism.

2B, the main circuit unit 20 includes a housing 21, an upper terminal 22 fixed to the housing 21 and connected to the power source side, a lower terminal 23 connected to the load side, An opening and closing part such as an unillustrated vacuum interrupter connected to the upper and lower terminals 22 and 23 and an opening and closing part such as an unillustrated vacuum interrupter housed in the housing 21. The upper and lower terminals 22 and 23, And an insulating cover (24, 25) joined thereto.

The opening / closing mechanism (not shown) is a known device that controls opening and closing of the main circuit unit 20 by opening / closing the opening / closing unit (not shown) built in the housing 21.

The circuit of the vacuum circuit breaker 10 constructed in this way is constructed so as to withstand the withstand voltage and the impact voltage by keeping the distance of the insulation distance according to the insulation class.

Although the insulating covers 24 and 25 are respectively coupled to the upper and the front surfaces of the housing 21 after the insulating covers 24 and 25 are assembled to the housing 21, A sufficient inter-phase insulation distance can not be ensured because the cradle 50 (see FIG. 2) is exposed to the outside through the terminal hole 26 of the insulating cover 25 for coupling with a connection terminal (not shown) of the cradle 50

The upper and lower terminals 22 and 23 exposed to the outside may be provided with an insulation distance between the ground and the upper and lower terminals 22 and 23 or between the ground and the upper and lower terminals 22 and 23 in order to secure a sufficient insulation distance, A method of inserting the insulating barriers 31 between the upper and lower terminals 22 and 23 to insulate the upper and lower terminals 22 and 23 located between the upper and lower terminals 22 and 23 is widely used.

1C and 1D, the insulating barrier 31 is bolted to the wall 13 fixed to the frame 12 located rearwardly through the " C "bracket 41, as shown in FIG. 2C and bolted to the frame 11 located forward through the "C" shaped lower bracket 42 as shown in FIG. 2D.

2 shows another embodiment of the insulating barrier 32 provided on the frame 51 of the cradle 50 in which the vacuum circuit breaker 10 is housed. This embodiment is also a cradle The insulating barriers 32 are bolted to the frame 51 of the frame 50 to join them.

2, when the vacuum interrupter 10 is housed in the cradle 50, the housing 21 of the vacuum interrupter 10 is separated from the insulating barrier 32 by a predetermined distance, The spacing of the insulating barriers 32 is set in advance so as to be able to be isolated by the insulating barriers 32, respectively.

However, the insulating barriers 31 and 32 of the type shown in Figs. 1C and 2 are not limited to the height and width of the main circuit part 20, There is a problem that the material cost for manufacturing the insulating barrier 30 is increased.

The insulating barriers 31 and 32 having a large size as described above are not only difficult to handle but are also susceptible to breakage during assembly. Even when installed in the vacuum circuit breaker 10 or the cradle 50, There is always a risk that the insulating barriers 31 and 32 are damaged.

Separate brackets 41 and 42 for attaching the insulating barriers 31 and 32 to the frame 11 of the vacuum circuit breaker and the wall 13 fixed to the frame 12 and bolts 60 and nuts It is necessary not only to manufacture and manage the insulation barriers 31 and 32 but also to install the insulating barriers 31 and 32 on the frames 11 and 12 of the vacuum circuit breaker or the frame 51 of the cradle, The productivity for such a product was inevitably lowered.

Fig. 3 shows another embodiment of the insulating barrier 33, in which the upper and lower terminals 22 and 23 of the main circuit are all connected to the terminals of the main circuit, without the insulating barrier being provided between the housings 21 as shown in Fig. 1C and Fig. A cylindrical insulating barrier 33 formed along the longitudinal direction of the upper and lower terminals 22, 23 is provided on the insulating cover 25 so as to be able to be isolated.

3, the production cost of the cylindrical insulating barriers 33 is increased, and the number of the cylindrical insulating barriers 33 is increased. In addition, in the case of the conventional embodiment according to Fig. 3, Is long, it is also vulnerable to breakage, and the mass productivity is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides an insulating barrier assembly structure of a circuit breaker in which an insulating barrier is provided on a circuit breaker, the assembling convenience of the insulating barrier is improved, the risk of breakage is lowered, and the material cost can be minimized It has its purpose.

In order to achieve the above-mentioned object, the present invention provides an insulating cover for insulating a main circuit, a first terminal connected to the power source side exposed to the outside through a terminal hole formed in the insulating cover, a second terminal connected to the load side, and an insulating barrier detachably coupled to the insulating cover so as to isolate the first and second terminals from each other for phase-to-phase insulation.

Here, a slot for coupling with an insulating barrier is formed on the insulating cover, and a coupling portion inserted and fixed in the slot is formed at the tip of the insulating barrier.

The coupling portion may include a head portion inserted into the slot, and a hooking groove may be formed in a lower portion of the head portion, in which the coupling wall of the insulating cover formed below the slot is inserted.

The coupling portion has a snap fit structure that is coupled to the slot by an elastic force of the coupling portion when the coupling portion is inserted into the slot.

It is preferable that a pressure wall is formed on the insulating cover on both sides of each slot so as to press both sides of the insulating barrier inserted in the slot.

The distance between the pressure walls is preferably smaller than the thickness of the insulating barrier.

Here, guide protrusions may be formed along the coupling direction of the insulating barrier on the inner side of each pressure wall or on both side surfaces of the insulating barrier.

Further, a supporting portion on which the bottom surface of the insulating barrier inserted in the slot is seated may be formed on the insulating cover under the pressure wall.

Further, it is preferable that the support portion and the pressure wall are connected to each other.

In the above embodiment, an insulating barrier may be provided only in the S-phase insulating cover positioned at the middle of the insulating covers on the RST 3.

The insulating barrier structure of the vacuum circuit breaker according to the present invention is constructed such that a small insulating barrier adjacent to the upper and lower terminals can be installed directly in the slot of the insulating cover so that only the upper and lower terminals requiring insulation are partially isolated, Which significantly reduces the material cost for producing an insulating barrier.

In particular, in comparison with the unreasonable point where the insulation barrier according to the conventional configuration shown in FIG. 1C and FIG. 2 is excessively arranged even in a portion where the insulation other than the upper and lower terminals is unnecessary, the insulating barrier assembly structure of the vacuum circuit breaker according to the present invention is effective It will be understood that the material of the insulating barrier can be reduced.

In addition, although the mold for manufacturing the insulation cover is separately fabricated, the present invention can reduce the size of the molding die compared with the conventional insulation cover having the cylindrical insulation barrier of FIG.

In addition, since the insulating barrier can be coupled to the insulating cover by simply inserting the coupling portion of the insulating barrier into the slot of the insulating cover, the present invention can improve the assembling convenience for assembling the insulating barrier to the insulating cover , It is unnecessary to use brackets, bolts and nuts for mounting the frame of the vacuum interrupter and the frame wall of the vacuum breaker or the frame of the cradle as in the conventional art.

In addition, the insulating barrier structure of the vacuum circuit breaker according to the present invention minimizes the size of the insulating barrier, thereby reducing the risk of handling and breakage thereof.

1A is a perspective view of a vacuum breaker according to the prior art.
1B is an exploded perspective view of a main circuit portion of a vacuum circuit breaker according to the prior art.
1C is a perspective view of a vacuum breaker according to the prior art showing a state in which the insulating barrier is fixed to the frame and the walls of the frame by "C" shaped brackets.
1D is a perspective view of a vacuum breaker according to the prior art showing a state in which the insulating barrier is fixed to the frame by a "C " shaped bracket.
2 is a perspective view of a cradle according to the prior art showing a state in which it is fixed to a frame by brackets "b ".
3 is a perspective view of a vacuum breaker according to the prior art in which the insulating cover is formed with a cylindrical insulating barrier.
4 is a perspective view of a vacuum circuit breaker in which an insulating barrier assembly structure according to the present invention is applied to an insulating cover.
5A is a front view of an insulating cover according to the present invention.
5B is a perspective view of an insulating cover according to the present invention.
6 is a perspective view of an insulating barrier according to the present invention.
7A and 7B are illustrations showing how an insulating barrier according to the first and second embodiments of the present invention is coupled to an insulating cover.

In describing the concrete embodiments of the present invention, it will be described that the insulating barrier according to the present invention is installed in the insulating cover of the vacuum circuit breaker for convenience of explanation.

However, if any type of circuit breaker has terminals exposed to the outside of the insulation cover and there is a necessity of insulation to the interphase terminals, the assembly structure of the insulation barrier to which the technical idea of the present invention is applied may be applied to the circuit breaker.

In other words, the assembly structure of the insulation barrier applied to the vacuum circuit breaker illustrated in the preferred embodiment of the present invention can be easily implemented by the person skilled in the art using the technical idea of the present invention. It should be understood, however, that the technical spirit and scope of the present invention are not meant to be limited to a vacuum circuit breaker.

Hereinafter, a vacuum circuit breaker to which the insulating barrier assembly structure according to the present invention is applied will be described with reference to FIGS.

4, the vacuum circuit breaker 100 includes frames 110 and 120, a main circuit unit 200, an unshown opening and closing mechanism for opening and closing the main circuit, and a not shown control unit for controlling the opening and closing unit mechanism Device.

The main circuit unit 200 includes a housing 210, a first terminal 220 fixed to the housing 210 and connected to the power supply side, a second terminal 230 connected to the load side, (Not shown), such as a vacuum interrupter, which is connected to the first and second terminals 220 and 230 and the housing 210. The first and second terminals 220 and 230 and the opening / And insulating covers 240 and 250, respectively, which are coupled to each other.

4, the first and second terminals 220 and 230 may be connected to each other through the first and second terminals 220 and 230, Is exposed to the outside through the terminal hole 251 formed in the insulating cover 250.

On the other hand, the opening and closing mechanism (not shown) is a well-known device that controls opening and closing of the main circuit unit 200 by opening and closing the opening and closing unit, which is not shown in the housing 210.

The insulating barrier assembly structure of the present invention having the above structure is characterized in that the insulating barrier 300 is formed on the insulating cover 250 covering the main circuit unit 200 to isolate the upper and lower terminal portions 220 and 230 of the main circuit unit 200 from each other, Is installed directly and removably.

The insulating barriers 31 and 32 are provided on the frame 11 of the vacuum circuit breaker 10 and the frame 51 of the cradle 50 fixed to the frame 120 so as to form an interphase terminal portion And upper and lower terminal portions) 22 and 23, there is a problem that the size of the insulating barriers 31 and 32 becomes excessively large.

However, the assembly structure of the insulating barrier 300 of the vacuum circuit breaker according to the present invention is such that the insulating barrier 300 is directly connected to the terminal portions 220 and 230 exposed from the insulating cover 250, Only the upper and lower terminals 220 and 230 that require substantial inter-phase insulation are isolated through the insulating barrier 300, so that the size of the insulating barrier 300 can be minimized while securing the inter-insulating distance.

Hereinafter, an assembling structure of the insulating barrier 300 and the insulating cover 250 according to the present invention will be described in detail.

5A and 5B, the insulating barrier 300 is provided with a slot 252 for coupling, and the tip end 310 of the insulating barrier, as shown in FIGS. 6 to 7B, An engaging portion 320 inserted and fixed in the slot 252 is formed.

The coupling portion 320 may have a hook shape and may have a structure in which the coupling portion 320 is hooked to the coupling wall 253 of the insulation cover forming the slot 252 after passing through the slot 252.

 7A, the coupling part 320 according to the first embodiment of the present invention includes a head part 321 inserted into the slot 252, and the head part 321 The engaging portion 320 may be formed in a hook shape by forming the engaging groove 322 into which the engaging wall 253 of the insulating cover located below the slot 252 is inserted.

Of course, as shown in FIG. 7B, the engaging part 320 according to the second embodiment of the present invention may have a snap fit structure in addition to the hook type described above.

At the level of those skilled in the art, the coupling part 330 having the snap fit structure can be variously implemented, for example, a pair of cantilevers 331 extending from the tip 310 of the insulating barrier, And a latching protrusion 332 formed at the tip of the latching protrusion 332.

The coupling part 330 configured in the form of a snap-fit is moved such that the pair of cantilevers 331 move close to each other when the engaging jaw 332 comes into contact with the inner surface of the slot 252 when passing through the slot 252, After the latching jaw 332 has passed through the slot 252, the latching jaw 332 is caught by the latching wall 253 of the insulating cover by the self-restoring force of the cantilever 331.

The insulation barrier assembly structure of the circuit breaker according to the present invention further comprises a pressure wall 260 for pressing both sides of the insulation barrier 300 inserted in the slot 252 on the insulation cover 250 on both sides of each slot 252 Structure.

The distance w between the pressing walls 260 is formed to be smaller than the thickness t of the insulating barrier 300 so that when the insulating barrier 300 is inserted between the pressing walls 260, Are pressed outward on both sides of the insulating barrier 300 while being deformed outward.

The pressing wall 260 having such a configuration guides the insulating barrier 300 in the process of coupling the insulating barrier 300 to the insulating cover 250 so that the insulating barrier 300 smoothly contacts the insulating cover 250 .

Particularly, when the guide protrusion 270 is formed on the inner surface of each pressurizing wall 260 or on both sides of the insulating barrier 300 along the joining direction of the insulating barrier 300, It is possible.

When the guide protrusion 270 is formed in the pressing wall 260, the insulating cover 250, the slot 252, and the pressurizing wall 260 can be formed at the same time when the guide protrusion 270 is formed. A separate process is not required.

Although not shown, in the case of forming the insulating barrier 300 by molding, the pressing projection may be formed in the insulating barrier 300.

However, when the mold for forming the pressing projection is formed on the insulating barrier 300, the manufacturing cost of the insulating barrier 300 is increased.

Therefore, in the present invention, a method is employed in which the plate-like insulating barrier 250 is cut by a simple method such as laser machining, and the guide protrusion 270 is formed on the pressing wall 260 by molding.

Since the insulating barrier 300 is in contact with both sides of the insulating barrier 300 at all times after the insulating barrier 300 is coupled to the insulating cover 250, The insulating barrier 300 is not detached from the insulating cover 250 even when the vacuum circuit breaker is moved for the purpose of moving the vacuum breaker.

Particularly, by the structure in which the pressure wall 260 always coincides with both sides of the insulating barrier 300, the insulating barrier 300 and the pressure wall 260 are formed in a similar structure to each other, 260 support both sides of the insulating barrier 300, the possibility of breakage of the insulating barrier 300 during use of the vacuum circuit breaker is significantly reduced.

In addition to the structure of the pressurizing wall 260, a support portion 254 on which the bottom of the insulating barrier 300 inserted in the slot 252 is seated is formed on the insulating cover 250 below the pressurizing wall 260 It is possible.

The support portion 254 serves to firmly support the bottom surface of the insulating barrier 300 inserted into the slot 252.

The support portion 254 may be separated from the support portion 340 and the pressurizing wall 260. However, if the support portion 254 is formed so as to be connected to each other at the time of molding, the support portion 254 may be damaged by the pressurizing wall 260 The insulating barrier 300 coupled to the insulating cover 250 can be more stably supported.

Here, when the support portion 254 and the pressurizing wall 260 are connected to each other, their cross-section has a shape similar to a "U"

The insulating cover 250 according to the present invention can be applied to all of the RST 3 phases and the insulating barrier 300 can be provided only on the S phase located in the center of the RST 3 phase .

However, in order to further secure the insulation between the RST phases, the insulating barrier 300 corresponding to the R phase and the T phase may also be provided.

If an insulating cover is provided only in the insulating cover 250 corresponding to the S phase, the insulating cover 25 having the same shape as the conventional one can be applied to the insulating cover 250 corresponding to the R and T phases There will be.

Although the insulation barrier assembly structure of the circuit breaker according to the present invention constructed as described above has been described in connection with the preferred embodiment assuming that the present invention is applied to the above-mentioned vacuum circuit breaker, It will be appreciated by those skilled in the art that modifications and variations of the various conventional circuit breakers are possible and all such changes and modifications are intended to be within the scope of the appended claims.

100: vacuum breaker 110, 120: frame
200: main circuit part 210: housing
220: first terminal, upper terminal 230: second terminal, lower terminal
240, 250: Insulation cover 251: Terminal hole
252: Slot 253:
254: support part 260: pressure wall
270: guide projection 300: insulating barrier
310: tip of insulating barrier 320, 330:
321: head 322:
331: Cantilever 340: Jaw

Claims (10)

Insulation cover for main circuit insulation,
A first terminal connected to the power source side exposed to the outside through a terminal hole formed in the insulating cover, a second terminal connected to the load side,
And an insulating barrier detachably coupled to the insulating cover so as to isolate the first and second terminals from each other for phase insulation,
The insulating cover is formed with a slot for coupling with the insulating barrier,
The tip of the insulating barrier is provided with an engaging portion inserted and fixed in the slot,
On the insulating cover on both sides of each slot, a pressure wall for pressing both sides of the insulating barrier inserted in the slot is further formed,
And a guide protrusion is formed on the inner side of each pressure wall or on both sides of the insulating barrier along the direction of joining of the insulating barriers. delete The method according to claim 1,
The coupling portion has a head portion inserted into the slot,
Wherein an inserting groove is formed in a lower portion of the head portion to receive an engaging wall of an insulating cover formed under the slot. The method according to claim 1,
Wherein the coupling portion has a snap fit structure that is coupled to the slot by an elastic force of the coupling portion when the coupling portion is inserted into the slot. delete The method according to claim 1,
And the distance between the pressure walls is smaller than the thickness of the insulating barrier. delete 7. The method according to claim 1 or 6,
And a support portion on which a bottom surface of the insulating barrier inserted in the slot is seated is formed on the insulation cover under the pressure wall. 9. The method of claim 8,
Wherein the support portion and the pressure wall are connected to each other. The method according to any one of claims 1, 3, 4, and 6,
Wherein an insulation barrier is provided only in the S phase insulation cover located at the center of the RST 3 phase insulation cover.
KR1020150187785A 2015-12-28 2015-12-28 Structure of insulation barrier for circuit breaker KR101752301B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200093352A (en) 2019-01-28 2020-08-05 엘에스일렉트릭(주) Circuit breaker
WO2022035009A1 (en) * 2020-08-11 2022-02-17 엘에스일렉트릭 (주) Circuit breaker having main circuit unit cover
KR20220062956A (en) * 2020-11-09 2022-05-17 엘에스일렉트릭(주) Moled Case Circuit Breaker having Insulation Barrier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000333321A (en) * 1999-05-20 2000-11-30 Mitsubishi Electric Corp Switching device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000333321A (en) * 1999-05-20 2000-11-30 Mitsubishi Electric Corp Switching device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200093352A (en) 2019-01-28 2020-08-05 엘에스일렉트릭(주) Circuit breaker
WO2022035009A1 (en) * 2020-08-11 2022-02-17 엘에스일렉트릭 (주) Circuit breaker having main circuit unit cover
KR20220020111A (en) * 2020-08-11 2022-02-18 엘에스일렉트릭(주) Cuicuit Breaker having Main Circuit Part Cover
KR102467791B1 (en) * 2020-08-11 2022-11-16 엘에스일렉트릭(주) Cuicuit Breaker having Main Circuit Part Cover
KR20220062956A (en) * 2020-11-09 2022-05-17 엘에스일렉트릭(주) Moled Case Circuit Breaker having Insulation Barrier
KR102491916B1 (en) * 2020-11-09 2023-01-26 엘에스일렉트릭(주) Moled Case Circuit Breaker having Insulation Barrier

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