KR102206960B1 - Low voltage type double circuit breaker for extinguishing arc using vacuum insulation - Google Patents

Abstract

The present invention relates to a low voltage type positive power vacuum transfer circuit breaker, which can extinguish transfer switching and arc flash for positive power of a low voltage circuit through vacuum insulation. In the low voltage type positive power circuit breaker, provided is a low voltage type positive power vacuum transfer circuit breaker capable of extinguishing through vacuum insulation, which has an upper and lower input terminal for connecting commercial power and generator power up and down on one side with respect to a vertical piece, and a ″U″-shaped barrier forming an output terminal between the upper and lower input terminals, and in which first and second vacuum circuit breakers are installed at the upper and lower input terminals, respectively, and first and second manipulation units for controlling the opening and closing of the upper and lower input terminals are installed symmetrically on the left and right sides of the diaphragm on the other side of the vertical piece, respectively.

Description

Low voltage type double circuit breaker for extinguishing arc using vacuum insulation}

The present invention relates to a circuit breaker, and in particular, a low voltage type capable of extinguishing transfer switching and arc flash (hereinafter referred to as SOHO) for both power sources of a low voltage circuit through vacuum insulation. It relates to a vacuum circuit breaker for positive power.

In general, a circuit breaker is an electrical protection device that protects load devices and lines from accidental currents in case of accidents such as short circuits or ground faults occurring in electrical circuits.When overcurrents exceeding the rated current allowable value flow in the circuit, the contacts trip to protect the circuit. (Trip, Open) cuts off the current.

Some of these breakers have an exposed control device and are used as a switch as well as a cut-off device for circuit protection.

The circuit breaker is an air circuit breaker (ACB) using air as an extinguishing medium depending on the extinguishing medium, a vacuum circuit breaker (VCB) using the insulation strength of vacuum, and an oil circuit using oil as the extinguishing medium. Breaker, OCB), gas circuit breaker (GCB) using inert gas hexafluoride (SF ₆ ) gas, magnetic circuit breaker (MCB), etc.

Among them, air circuit breakers, vacuum circuit breakers, and gas circuit breakers are used in a wide range of applications, and the insulation capacity of the circuit breaker, that is, extinguishing ability, is in the order of vacuum circuit breaker, gas circuit breaker, and air circuit breaker, and vacuum circuit breakers are from medium voltage to high voltage (7.2 kV, 12kv, 24kv), gas circuit breaker is used for high voltage of 24kv, air circuit breaker is used for low voltage.

On the other hand, the vacuum circuit breaker is mainly responsible for power transport control and protection of the power system.It has a large breaking capacity, high reliability and safety, and can be mounted in a small installation space, so its usage is high. The vacuum valve (Vacuum Interrupter, VI) used as a core component is expensive, and the manipulator must be larger because the contact pressure of the contact must be stronger than other circuit breakers, and the gas circuit breaker requires a tank to fill the gas. It has the disadvantage that it is expensive. Therefore, a vacuum valve or a gas tank is not required and, as it is exposed to the air, relatively inexpensive air breaker (ACB) and air transfer switch (ATS) are commonly used.

However, the existing air circuit breaker (ACB) and air power transfer switch (ATS) open and close in the air when opening and closing, so the arc is exposed to the atmosphere, so there is a lot of contact loss due to the arc, and the function of the extinguishing box is insufficient. If the blocking fails, there is a risk of explosion due to an arc, and since the contact is exposed to the air, the minimum separation distance of the contact is reduced by dust or moisture in the air, and the insulation may be easily destroyed. There is a problem that is not suitable for application to chemical complexes or confined places.

In addition, with the exception of the existing two air power transfer switches, two air breakers are installed as a group, and as an interlock device is installed and used externally, a lot of space is required. When inrush current occurs, there is also a problem in that an arc chamber must be provided to prevent damage due to overcurrent.

KR 10-0423223 B1 (2004.03.04.) KR 10-0502841 B1 (2005.07.13.) KR 10-0687653 B1 (2007.02.21.) KR 10-0808927 B1 (2008.02.25.)

Accordingly, the present inventors have put an emphasis on solving the limitations and problems of the existing air circuit breaker, vacuum circuit breaker, and air power transfer switch by comprehensively considering the above-described matters, thereby omitting the arc chamber essential to the air circuit breaker. It is possible to reduce the size and weight due to the simple operation structure due to the short contact distance, and to maintain high reliability and long life with a low leakage rate, and a new structure with a large-capacity cut-off function when opening and closing a load. The present invention was invented as a result of continuous research with great effort to develop.

Therefore, the technical problem and object to be solved by the present invention is to replace the conventional two-power transfer switch in the air or integrate two air breakers in a vertically symmetrical structure to replace the functions performed by the two existing ones, and the vacuum valve This is to provide a low-voltage positive-power vacuum transfer circuit breaker that can be extinguished through vacuum insulation that can reduce the contact distance and reduce the size and weight.

Herein, the technical problems and objects to be solved by the present invention are not limited to the technical problems and objects mentioned above, and other technical problems and objects not mentioned will be clearly understood by those skilled in the art from the following description.

To achieve the above object, the low-pressure type positive power vacuum switch circuit breaker capable of extinguishing through vacuum insulation according to the present invention has an upper and lower input terminals connecting commercial power and generator power up and down on one side of the vertical side, and the upper and lower side It has a "U"-type barrier that forms an output end between the input ends of the side, and the first and second vacuum breakers are installed at the upper and lower input ends, respectively, and are located symmetrically on both sides with a diaphragm on the other side of the vertical side. It characterized in that it is formed by installing each of the first and second operation units respectively controlling the opening and closing of the upper and lower input terminals.

In addition, the low-voltage type positive power supply vacuum switch circuit breaker capable of extinguishing through vacuum insulation according to the present invention for achieving the above object is, in the low-voltage type positive power supply circuit breaker, an intermediate output terminal for electrical output is coupled to one side based on a vertical piece. A barrier having a coupling end and an upper and lower coupling end to which first and second input terminals for electrical input are respectively coupled at an upper and lower position around the same; First and second vacuum circuit breakers positioned vertically symmetrically around the intermediate coupling end and electrically opening and closing the first and second input terminals and the output terminals, respectively; A first contact spring installed at the upper coupling end to open and close the first vacuum breaker; A second contact spring installed at the lower coupling end to open and close the second vacuum breaker; And first and second operation units positioned on the other side of the vertical piece in a pair of left and right with respect to the diaphragm, respectively, opening and closing the first and second contact springs, respectively.

At this time, in the low-pressure type positive power vacuum switch circuit breaker capable of extinguishing through vacuum insulation according to the present invention, the first and second operation units include a drive motor fixed to the diaphragm, a bevel gear coupled to a drive shaft of the drive motor, and , A worm gear meshed with the bevel gear and rotated, a worm wheel meshed with the worm gear and rotated, a spring support pin fixed to one side of the surface of the worm wheel, a close latch fixed to one surface of the worm wheel, and the worm wheel. A closing cam fixed to one side of the surface, a latch pin for restraining the rotation of the closing latch, a three-fold link deployed and reduced by the closing cam, an open latch for restraining the three-fold link, and one side is the A shaft chain spring connected to the spring support piece and the other side fixed to the spring fixing piece of the diaphragm, a driving cam rotatably fixed to the diaphragm, a first connection link connecting the three-fold link and the driving cam, A second connection link having one end connected to the first connection link, a compression lever rotatably coupled to the barrier and one end compressing a spring of the first contact spring, and the other end of the compression lever and the second connection link It is characterized in that it is each composed of an insulating arm connecting the other end of the.

In addition, in the low pressure type positive power vacuum switch circuit breaker capable of extinguishing through vacuum insulation according to the present invention, the three-fold link includes a fixing pin (A) and a fixing pin (B) fixed to the diaphragm, and a fixing pin ( A first link that is rotatably fixed to A) and has one end supported by the open latch and provided with a roller at the other end, and the center of the bent shape is rotatably coupled to the fixing pin (B), and one end is the first connection link And a second link connected to the second link and a third link connecting the other end of the second link and the other end of the first link.

As described above, the present invention has the advantage of miniaturization because it is possible to reduce the separation distance of the contact points through the vacuum breaker.

In addition, the present invention has the effect of providing a switch with a small size and weight by integrating two vacuum breakers in a vertically symmetrical structure.

In addition, by applying the advanced contact and insulation technology to the vacuum valve, the present invention can maintain high reliability and life as long as possible with a low leakage rate as well as miniaturization and weight reduction of the circuit breaker, and the spring shrinkage (injection) method is used as a worm gear method. By implementing it, there is an effect that can minimize the driving moment.

In addition, the present invention has the advantage of maintaining a long vacuum life by maintaining a vacuum state for a long time without being affected by the surrounding environment by sealing welding in a high vacuum state.

In addition, the present invention has an effect of providing a structure capable of withstanding a short circuit current and a high electromagnetic force generated during a short circuit by using the vacuum valve as an insulating tool.

In addition, the present invention has the advantage of being able to apply the voltage level of the vacuum valve without changing the operating mechanism even when applied to a DC voltage circuit requiring a higher insulation distance than an AC.

In addition, the present invention has the advantage of shortening the charging time by charging according to the motor operation.

1 is a front configuration diagram according to the present invention,
2 is a separate configuration diagram showing a vacuum circuit breaker and a contact spring in FIG. 1,
3 is a front cross-sectional view showing the barrier in FIGS. 1 and 2;
4 is a plan configuration diagram of FIG. 3;
5 is an enlarged view showing a vacuum breaker and a contact spring according to the present invention in FIG. 2;
6 is a use state diagram showing the rear manipulator centered on the diaphragm in FIGS. 1 and 2;
7 is a use state diagram showing a closing (CLOSE) state through the manipulator according to the present invention,
Figure 8 is a state of use of Figure 7,
9 is a use state diagram showing an open (OPEN) state through the manipulator according to the present invention.

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

Prior to this, the terms to be described later are defined in consideration of functions in the present invention, and this should be interpreted as a concept conforming to the technical idea of the present invention and a meaning commonly or commonly recognized in the art.

In addition, when it is determined that a detailed description of known functions or configurations related to the present invention may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Here, the accompanying drawings are partially exaggerated or simplified for convenience and clarity of explanation and understanding of the configuration and operation of the technology, and it is understood that each component does not exactly correspond to the actual size and shape.

In addition, when a certain part includes a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

1 is a front configuration diagram according to the present invention, Figure 2 is a separate configuration diagram showing a vacuum circuit breaker and a contact spring in Figure 1, Figure 3 is a front cross-sectional view showing the barrier in Figures 1 and 2, 4 is a plan configuration diagram of FIG. 3, FIG. 5 is an enlarged view showing a vacuum breaker and a contact spring according to the present invention in FIG. 2, and FIG. 6 is a rear manipulator centered on a diaphragm in FIGS. 1 and 2 Fig. 7 is a use state diagram showing a closing (CLOSE) state through a manipulator according to the present invention, Fig. 8 is a use state diagram of Fig. 7, and Fig. 9 is an open through a manipulator according to the present invention ( OPEN) is a use state diagram showing a state of use. Hereinafter, a low-pressure type positive power vacuum switch circuit breaker capable of extinguishing through vacuum insulation according to the present invention will be described with reference to FIGS. 1 to 9.

The positive power vacuum circuit breaker according to the present invention includes an intermediate coupling end 111 to which an output end (O) for electrical output is coupled to one side based on the vertical piece 110, and an upper and lower position based on the intermediate coupling end 111 for each electrical input. The barrier 100 having the upper and lower coupling ends 112 and 113 to which the first and second input terminals N1 and N2 are respectively coupled, and the intermediate coupling end 111 are positioned to be vertically symmetrical. The first and second input terminals (N1)) (N2) and the output terminal (O) are electrically opened and closed, respectively, in the first vacuum circuit breaker 300 and the second vacuum circuit breaker 200, and installed at the upper coupling terminal 112 A first contact spring 320 for opening and closing the first vacuum breaker 300, a second contact spring 220 installed at the lower coupling end 113 to open and close the second vacuum breaker 200, the vertical The first and second operation units 400 and 400a are located on the other side of the piece 110 in a pair of left and right around the diaphragm 114 and open and close the first and second contact springs 320 and 220, respectively. ).

The first and second vacuum circuit breakers 300 and 200 open and close the power of the first and second input terminals N1 and N2 to an output terminal by performing a known technique.

The first and second contact springs 320 and 220 open and close the first and second input terminals N1 and N2 according to the compression and restoring force of the springs 322 and 222 provided therein, respectively. .

The first and second manipulating parts 400a and 400 are positioned symmetrically on both sides with respect to the diaphragm 114 on the other side of the vertical piece 110, so that the first manipulating part 400a is a first contact spring. The operation 320 and the second operation unit 400 operates the second contact spring 220.

A configuration in which the second contact spring 220 is operated through the second manipulation unit 400 is as follows. The configuration and operation of the first manipulator 400a shown in FIG. 6 are also the same as the second manipulator 400, so a description of the configuration and operation of the first manipulator 400a is omitted for convenience of explanation. It is sufficiently predictable to those skilled in the art from the description of the configuration and operation of the second manipulation unit 400.

A drive motor 410 fixed to the partition plate 114, a bevel gear 412 coupled to a drive shaft of the drive motor 410, a worm gear 420 engaged with the bevel gear 412 and rotated, The worm wheel 422 engaged with the worm gear 420 and rotated, a spring support pin 424 fixed to one surface of the worm wheel 422, and a close latch fixed to one surface of the worm wheel 422 LATCH) 426, a closing cam 428 fixed to one side of the surface of the worm wheel 422, a latch pin 430 that restricts rotation of the closing latch 426, and the closing cam 428 The three-fold link 440 that is expanded and reduced by the three-fold link 440 and the open latch 450 for restraining the three-fold link 440, one side is connected to the spring support piece 424 and the other side is a spring fixing piece of the diaphragm A shaft spring 460 fixed to 115, a driving cam 470 rotatably fixed to the diaphragm, and a first connection link connecting the three-fold link 440 and the driving cam 470 ( 480, a second connection link 482 having one end connected to the first connection link 480, and rotatably coupled to the barrier 100, and one end of the spring of the second contact spring 220 ( It may be composed of a compression lever 490 for compressing 222 and an insulating arm 492 connecting the other end of the compression lever 490 to the other end of the second connection link 482.

The three-fold link 440, the fixing pin (A) and the fixing pin (B) fixed to the diaphragm 114, the center is rotatably fixed to the fixing pin (A), and one end is the open latch 450 ) Supported by the first link 442 provided with a roller 441 at the other end, the center of the bent shape is rotatably coupled to the fixing pin (B), and one end is linked to the first connection link 480 It consists of a second link 443 and a third link 444 connecting the other end of the second link and the other end of the first link.

In the drawing, reference numeral 500 denotes a return spring, one end is fixed to the diaphragm 114, the other end is connected to a lever on one side of the driving cam 470 to return it to the initial position when the driving cam 470 rotates.

A process of inputting and blocking a contact in the both power circuit breaker of the present invention configured as described above will be described as follows.

First, the closing (CLOSE) operation will be described.

When the button is operated for closing, the drive motor 410 of the second operation unit 400 is driven, and when the drive shaft rotates accordingly, the bevel gear 412 coupled to the drive shaft rotates and the worm gear 422 ) Is rotated in a horizontal state, and at the same time, the worm wheel 422 is rotated by the worm gear 422. At this time, the spring support pin 424, the closing latch 426, and the closing cam 428 fixed to the worm wheel 422 rotate at the same time. Thereafter, when the close latch 426 rotates and is caught by the CLOSE LATCH PIN 430, the rotation of the driving motor 41 is stopped. At this time, the closing spring 460 for input is in a tensioned state.

Thereafter, when the closing operation signal is input, the closing solenoid coil for operating the latch pin 430 or an external manual closing (CLOSE) button is operated to rotate the latch pin 430 to lock the closing latch 426. Will be released.

Then, the worm wheel 420 rotates at high speed by the input shaft spring 460 that is tensioned while the restraint of the closing latch 426 is released, and at the same time, the closing cam 428 together with the closing latch 426 At this time, the closing cam 428 strongly hits the roller 441 of the three-fold link 440, while the three-fold fixed to the fixing pin A and the fixing pin B fixed to the diaphragm 114 The link 440 pushes the first connection link 480 to rotate the driving cam 470, and the second connection link 482 moves the insulating arm 492 in a continuous motion to be compressed by the compression lever 490. The spring 222 of the second contact spring 220 is released and moves upward, and at this time, the contact point of the second vacuum breaker 200 is connected to complete the closing state in which electrical current is possible.

Next, the OPEN operation will be described.

Input OPEN operation signal through button operation (open solenoid coil or external manual OPEN button).

Then, the open latch 450 rotates in a counterclockwise direction by an operation according to the signal value, and at this time, the driving cam 470 rotates in a clockwise direction through the restoring force of the return spring 500, and the three-fold link 440 ) Of the link is rotated around the fixing pin (A) and fixing pin (B).

At this time, the third link 440 pulls the first connection link 480 by the clockwise rotation of the driving cam 470, and accordingly, the second connection link 482 moves the insulating arm 492 to compress it. As the spring 222 of the second contact spring 220 is compressed by the lever 490, the second contact spring 220 is moved downward. At this time, the contact point of the second vacuum circuit breaker 200 is separated and the internal contact point Is in the OPEN state.

As described above, the low-voltage type positive power vacuum switch circuit breaker capable of extinguishing through vacuum insulation according to the present invention replaces the conventional two power switch switch in the air, or integrates two air circuit breakers in a vertically symmetrical structure to be performed by two existing units. It replaces one function, and the contact distance can be reduced by a vacuum valve, making it possible to reduce the size and weight.

Meanwhile, in the detailed description of the present invention, although it has been specifically described with reference to a preferred embodiment referenced by the accompanying drawings, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined by the scope of the claims to be described later as well as the scope and equivalents of the claims.

N1: first input terminal N2: second input terminal
O: Output terminal A, B: 3-link fixing pin
100: barrier 110: vertical
111: middle coupling end 112: upper coupling end
113: lower coupling end 114: diaphragm
115: spring fixing piece 200: second vacuum circuit breaker
220: second contact spring 222: spring
300: first vacuum breaker 320: first contact spring
322: spring 400: second operation unit
400a: first operation unit 410: drive motor
412: bevel gear 420: worm gear
422: worm wheel 424: spring support pin
426: closing latch 428: closing cam
430: latch pin 440: 3-fold link
441: roller 442: first link
443: second link 444: third link
450: open latch 460: shortened spring
470: drive cam 480: first connection link
482: second connection link 490: compression lever
492: insulation arm 500: return spring

Claims (4)

delete In the low voltage type positive power circuit breaker,
A barrier having an intermediate coupling end to which an output end for electrical output is coupled to one side of the vertical piece and an upper and lower coupling end to which first and second input terminals for electrical input are respectively coupled at an upper and lower position around the same; First and second vacuum circuit breakers positioned vertically symmetrically about the intermediate coupling end and electrically opening and closing the first and second input terminals and the output terminals, respectively; A first contact spring installed at the upper coupling end to open and close the first vacuum breaker; A second contact spring installed at the lower coupling end to open and close the second vacuum breaker; And first and second operation units positioned on the other side of the vertical piece in a pair of left and right with respect to the diaphragm, respectively opening and closing the first and second contact springs, respectively;
The first and second operation units,
A drive motor fixed to the partition plate, a bevel gear coupled to a drive shaft of the drive motor, a worm gear meshed and rotated by the bevel gear, a worm wheel meshed with the worm gear and rotated, and fixed to one side of the surface of the worm wheel A spring support pin, a closing latch fixed to one side of the surface of the worm wheel, a closing cam fixed to one side of the surface of the worm wheel, a latch pin that restricts rotation of the close latch, and the opening and contracting by the closing cam A three-fold link, an open latch for restraining the three-fold link, an axle spring connected to the spring support pin and the other side fixed to the spring fixing piece of the diaphragm, and a drive rotatably fixed to the diaphragm A cam, a first connection link connecting the three-fold link and the driving cam, a second connection link having one end connected to the first connection link, and rotatably coupled to the barrier, and one end of the first contact A low-pressure positive-power vacuum circuit breaker capable of extinguishing through vacuum insulation, characterized in that each consists of a compression lever for compressing the spring of the spring and an insulating arm connecting the other end of the compression lever and the other end of the second connection link.
delete The method of claim 2, wherein the three-section link,
A fixing pin (A) and a fixing pin (B) fixed to the diaphragm,
A first link whose center is rotatably fixed to the fixing pin (A), one end supported by the open latch, and provided with a roller at the other end,
The center of the bent shape is rotatably coupled to the fixing pin (B), and a second link having one end linked to the first connection link
A low-voltage positive-power vacuum circuit breaker capable of extinguishing through vacuum insulation, comprising: a third link connecting the other end of the second link and the other end of the first link.

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