WO2022131849A1

WO2022131849A1 - Automatic arc test device

Info

Publication number: WO2022131849A1
Application number: PCT/KR2021/019276
Authority: WO
Inventors: 이규찬
Original assignee: 주식회사 스마트파워서플라이
Priority date: 2020-12-18
Filing date: 2021-12-17
Publication date: 2022-06-23
Also published as: KR102261226B9; KR102261226B1

Abstract

The present embodiment provides an arc test device comprising: an arc generating device including a first metal rod and a second metal rod arranged so as to face each other in one direction in a current path, a first body which is fixedly coupled to a support plate, and stands upright, and on which the first metal rod is mounted, a rail arranged on the support plate in the one direction, a second body on which the second metal rod is mounted and which is movable along the rail by using wheels, and a body mover which is fixedly coupled to the support plate and moves the second body by using an electric motor; a gap controller which transmits a control signal to the body mover to control a moving distance and a moving speed of the second body, includes a plurality of buttons, and matches and stores a specific moving distance value and a specific moving speed value in each of the buttons; a data collector which senses a current of the one current path, generates digital data by analog-to-digital conversion of a sensing signal, and generates frequency data by Fourier transformation of the digital data; and a server which transmits user setting data to the gap controller and the data collector, and displays the frequency data on a screen.

Description

automatic arc test device

This embodiment relates to an arc test apparatus.

Conventionally, in general, an AC power distribution system centered on commercial power has been used to supply power to various electric devices. Recently, the rapid increase in DC loads and the spread of new and renewable energy that produce DC power are rapidly taking place. Accordingly, the power produced by DC is used as DC without AC conversion, thereby improving power transmission efficiency and between components. DC power distribution, which can increase the efficiency of the entire system by simplifying the connection, is receiving a lot of attention. Utilizing these advantages, the DC power distribution system is being actively reviewed for application to Internet data centers, lighting, and commercial buildings. Expansion is also being considered.

Compared to the conventional AC power distribution system, the DC system has a disadvantage in that it is weak in terms of safety against arc accidents. In the AC system, the possibility of natural fire extinguishing is high even in the case of an arc accident as the current crosses zero as many times as twice the AC frequency of commercial power for 1 second, so the possibility of occurrence of an accident is relatively low. On the other hand, since the DC system does not have a zero point in the current, the probability of natural extinguishing is low when an arc accident occurs, and the risk is much higher than that of an arc accident in AC.

In addition, the direct current arc is difficult to extinguish naturally, so the risk is high, and there is also difficulty in detecting an accident. Arc accidents can occur due to aging in lines, weakening of electrical connections in connectors, etc. In the case of such a DC series arc, since the fault current is within the normal range, detection is difficult with conventionally installed over-current circuit breaker or earth leakage circuit breaker. difficult. Therefore, in order to secure the reliability and safety of the DC system, a separate arc detector or a circuit breaker with a built-in arc detection function is required.

On the other hand, in order to accurately detect the arc, it is necessary to accurately grasp the characteristics of the arc. However, since the arc has an atypical waveform, it is not easy to understand its characteristics. Therefore, many researchers are conducting an arc test to understand the characteristics of the arc, but a device to support this has not been developed, so each researcher is testing the arc manually. Since this manual arc test does not produce a lot of data, it does not increase the speed of research, and since the test conditions cannot be maintained consistently, the reliability of the data is also low.

Against this background, an object of the present embodiment is, in one aspect, to provide a technology capable of automatically performing an arc test. In another aspect, an object of the present embodiment is to provide an arc test apparatus capable of consistently maintaining test conditions. In another aspect, an object of the present embodiment is to provide an arc test apparatus capable of automatically calculating a plurality of data.

In order to achieve the above object, in one aspect, in this embodiment, the first metal rod and the second metal rod are arranged to face each other in one direction in a current path, the first metal rod is fixedly coupled to the support plate and stands upward, and the first metal rod is arranged to face each other in one direction. The first body on which this is mounted, the rail disposed in the one direction on the support plate, the second body on which the second metal rod is mounted and movable along the rail using wheels, and the support plate and fixedly coupled to the support plate and using an electric motor an arc generating device including a body mover to move the second body; a gap controller that transmits a control signal to the body mover to control the moving distance and the moving speed of the second body, has a plurality of buttons, and matches and stores a specific moving distance and moving speed value for each button; a data collector for sensing the current of the one current path, generating digital data by converting the sensing signal to analog to digital, and generating frequency data by Fourier transforming the digital data; and a server for transmitting user setting data to the gap controller and the data collector and displaying the frequency data on a screen.

The gap controller may block the arc generation by operating a relay disposed in the one current path when a predetermined time elapses after moving the second body to the arc generation distance.

The server may transmit and receive data through serial communication with the gap controller, and may control the moving distance and moving speed of the second body differently according to the magnitude of the load current flowing through the one current path.

The data collector may determine whether an arc has occurred using the frequency data, and transmit data after determining that an arc has occurred among the frequency data to the server.

The server may control the gap controller to repeatedly test the arc for a set moving distance.

As described above, according to this embodiment, it is possible to automatically proceed with the arc test. And, according to this embodiment, in the arc test, it is possible to increase the reliability of data while consistently maintaining the test conditions. And, according to the present embodiment, it is possible to automatically generate a large number of arc test data that can grasp the arc characteristics.

1 is a block diagram of an arc test apparatus according to an embodiment.

2 is a front view of an arc generating device according to an embodiment.

3 is a perspective view of one side of the arc test jig according to an embodiment.

4 is a perspective view of another side of the arc test jig according to an embodiment.

5 is a configuration diagram of a gap controller according to an embodiment.

6 is a button layout view of a gap manipulator according to an embodiment.

7 is a block diagram of a data collector according to an embodiment.

8 is a configuration diagram of a server according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is formed between each component. It should be understood that elements may also be “connected,” “coupled,” or “connected.”

1 is a block diagram of an arc test apparatus according to an embodiment.

Referring to FIG. 1 , the arc test apparatus 100 may include an arc generator 110 , a gap controller 120 , a data collector 130 , and a server 140 .

In the arc test, the power supply 10 and the load device 20 may be used. After the electric wire LN for transmitting power from the power supply device 10 and the load device 20 is cut into two, one end may be connected to the first metal rod 111 and the other end may be connected to the second metal rod 112 . In addition, the arc test apparatus 100 may test the arc by controlling the contact and separation of the first metal rod 111 and the second metal rod 112 .

The power supply device 10 may be a device for generating DC power. For example, the power supply device 10 may be a photovoltaic device or a battery device.

The load device 20 may be a device that consumes DC power. For example, the load device 20 may be a DC/AC converter that converts DC into AC, may be a DC/DC converter, or may be a DC load.

The electric wire LN may form a current path between the power supply device 10 and the load device 20 and transmit DC current.

The electric wire LN may be divided into two. Among the separated electric wires, the electric wire connected to the power supply 10 is connected to the first metal rod 111 , and the electric wire connected to the load device 20 is connected to the second metal rod 112 . ) can be associated with

A current sensor 132 may be disposed on the wire LN. Various types of sensors may be applied to the current sensor 132 , and in particular, a Hall sensor capable of sensing a high-frequency current may be applied.

Contact and separation between the first metal rod 111 and the second metal rod 112 may be controlled by the arc generator 110 . The arc generator 110 may contact the first metal rod 111 and the second metal rod 112 to allow the current generated by the power supply device 10 to flow to the load device 20 . In addition, the arc generating device 110 may generate an arc between the first metal rod 111 and the second metal rod 112 by separating the first metal rod 111 and the second metal rod 112 in a state in which current flows. have.

The gap controller 120 may transmit a control signal to the arc generator 110 to variously control the separation distance and the separation speed between the first metal rod 111 and the second metal rod 112 .

The data collector 130 may convert the signal sensed by the current sensor 132 into digital data using an analog-to-digital converter. In addition, the data collector 130 may generate frequency data by Fourier transforming the digital data.

The frequency data may include a frequency component value for a specific frequency band, and the data collector 130 compares the frequency component value for the specific frequency band with a reference value, and when the frequency component value exceeds the reference value, an arc on the wire LN can be considered to have occurred. Hereinafter, for convenience of explanation, a specific frequency band is called a test frequency band, and a frequency component value in the test frequency band is called a test frequency band component value.

The data collector 130 may transmit frequency data to the server 140 . And, the server 140 may display the frequency data in graphs or numbers on the screen.

The server 140, the data collector 130, and the gap controller 120 may transmit/receive data through serial communication such as RS485.

The server 140 may further include a user operation recognition device such as a keyboard and mouse, and may generate user setting data by recognizing a user operation input through the user operation recognition device. Then, the server 140 may transmit the user setting data to the gap controller 120 or the data collector 130 .

The user setting data may include, for example, set values for a separation distance and a separation speed between the first metal rod 111 and the second metal rod 112 . And, the user setting data may include a setting value for the Fourier transform.

2 is a front view of an arc generating device according to an embodiment.

2, the arc generator 110 includes a support plate 210, a first body 220, a second body 230, a rail 240, a body mover 250, a first metal rod 111 and A second metal rod 112 may be included. Among them, the support plate 210 , the first body 220 , the second body 230 , and the rail 240 may be defined as a configuration included in the arc test jig 200 .

The support plate 210 may support other components in the direction of gravity while in contact with the bottom surface of the space in which the arc test is performed.

The support plate 210 may be formed in a rectangular plate shape, and other components may be seated on the support plate 210 .

The first body 220 may be formed to be fixedly coupled to the support plate 210 and to stand upward. In addition, the first body 220 can fix the position of the first metal rod 111 while mounting the first metal rod 111 .

The first metal rod 111 may have an elongated column shape. In the drawing, a longitudinal direction of the first metal rod 111 is defined as an X′-X direction.

The rail 240 may be disposed on the support plate 210 in the X'-X direction. Wheels 231 may be disposed on the lower portion of the second body 230 . As these wheels 231 move along the rail 240 , the second body 230 may move in the X'-X direction. have.

A second metal rod 112 may be mounted on the second body 230 . The second metal rod 112 may have an elongated column shape, and the longitudinal direction may be the same X′-X direction as the first metal rod 111 .

The first metal rod 111 and the second metal rod 112 may be disposed to face each other in the X'-X direction, and the second metal rod 112 is moved by the second body 230 to be in contact with or spaced apart from each other. can

The separation distance and separation speed of the first metal rod 111 and the second metal rod 112 may be controlled by the body mover 250 .

The body mover 250 may be fixedly coupled to the support plate 240 , and may include an electric motor therein. And, the body mover 250 may push or pull the moving arm 252 in the X'-X direction through the electric motor.

The movable arm 252 may be connected to the second body 230 , and according to this connection, the movable arm 252 may move the second body 230 while moving in the X′-X direction.

The body mover 250 may receive a control signal from the gap controller and control the moving distance and moving speed of the moving arm 252 according to the control signal. And, according to this control, the separation distance and the separation speed between the first metal rod 111 and the second metal rod 112 may be determined.

Figure 3 is a perspective view of one side of the arc test jig according to an embodiment, Figure 4 is another perspective view of the arc test jig according to an embodiment.

3 and 4 , the arc test jig 200 may include a support plate 210 , a first body 220 , and a second body 230 .

The support plate 210 may include a plurality of legs 214 in contact with the bottom surface and a fixing plate 212 for fixing other components. The legs 214 may have the shape of a truncated cone, and the lower side may have a narrower shape than the upper side.

The fixing plate 212 may be bolted to the legs 214 and may have a rectangular plate shape with rounded corners.

The first body 220 may include a first lower body 222 and a first upper body 224 .

The first lower body 222 may be fixedly coupled to the support plate 210 through bolt coupling. In addition, a tunnel space 223 may be formed in the first lower body 222 , and a portion of the rail 240 may be inserted into the tunnel space 223 .

The first upper body 224 may be fixedly coupled to the first lower body 222 . The first upper body 224 may have an upwardly standing shape, and a first through hole 228 penetrating in the X′-X direction may be formed. The inner space of the first through hole 228 may be formed in a cylindrical shape, and a first metal rod may be inserted into this inner space.

A first fixing hole 226 may be formed above the first through hole 228. A bolt is inserted into the first fixing hole 226 and the first metal rod is pressed by the bolt to release the first metal rod. 1 may be fixed to the body 220 .

The rail 240 is disposed in the X'-X direction and may include two sub-rails. In each sub-rail, a rail groove and a rail mountain may be formed long in the X'-X direction.

The wheels 231 included in the second body 230 are fixed to the rail 240 in the upper and lower directions (gravity direction) while having wheel grooves and wheel mounts corresponding to these rail grooves and rail mounts, X 'You can move in the -X direction.

The second body 230 may include a second lower body 232 , a second upper body 234 , and wheels 231 .

The second lower body 232 may be disposed on the rail 240 . In addition, the wheels 231 may be coupled to the lower side of the second lower body 232 .

The wheels 231 may be fixed to the rail 240 in the upper and lower directions through the same shape as described above, and may move in the X′-X direction. The wheels 231 may be composed of a total of four, two wheels may be movedly coupled to one sub-rail, and the other two wheels may be movable to the other sub-rail.

The second upper body 234 may be fixedly coupled to the second lower body 232 and have a shape to stand up.

In addition, the second upper body 234 may have a second through hole 238 penetrating in the X'-X direction. The inner space of the second through hole 238 may be formed in a cylindrical shape, and a second metal rod may be inserted into the inner space.

A second fixing hole 236 may be formed above the second through hole 238 . A bolt is inserted into the second fixing hole 236 and the second metal rod is pressed by the bolt to form the second metal rod. 2 It may be fixed to the body 230 .

In the support plate 210 , the electric support 216 may be disposed on the fixed plate 212 , and the body mover may be seated on the electric support 216 .

5 is a configuration diagram of a gap controller according to an embodiment.

Referring to FIG. 5 , the gap controller 120 may include a gap communication unit 510 , a gap control unit 520 , and a gap manipulation unit 530 .

The gap communication unit 510 may transmit/receive data to and from the server through serial communication such as RS485. The gap communication unit 510 may receive user setting data from the server, and may receive programmed setting data from the server. The user setting data or the programmed setting data may include indication values for the separation distance and separation speed of the metal rods.

The gap control unit 520 may transmit a control signal (eg, a current signal, a voltage signal, etc.) to the arc generator to control the separation distance and separation speed of the metal rods.

The gap control unit 520 may receive an indication value for the separation distance and separation speed of the metal rods from the server, and may receive it from the gap operation unit 530 . The gap control unit 520 may generate a control signal according to the indicated value and transmit it to the arc generator.

The gap control unit 520 may include an information storage medium such as a register or a memory. In addition, the gap control unit 520 may store the indication values for the separation distance and the separation speed of the metal rods in the information storage medium, and then repeatedly generate a control signal and transmit it to the arc generator.

The gap control unit 520 may further include a timer. And, when the time of the timer reaches the set time, the gap control unit 520 may control the relay to block the current path.

The gap manipulation unit 530 may include buttons. And, it is possible to recognize the user manipulation of the buttons, and to control the separation distance and the separation speed of the metal rods according to the button selected according to the user manipulation.

6 is a button layout view of a gap manipulator according to an embodiment.

Referring to FIG. 6 , the gap manipulation unit 530 may include five buttons. In addition, the gap manipulation unit 530 may store the indicated values of the separation distance and the separation speed for the metal rods for each button.

The gap manipulator 530 can store the separation distance of 0.8 mm and the separation speed as 2.5 mm/s for the No. 1 button, and store the separation distance as 0.8 mm and the separation speed as 5.0 mm/s for the No. 2 button. have. The gap manipulation unit 530 may store the separation distance as 1.1 mm and the separation speed as 5.0 mm/s for the third button, and store the separation distance as 2.5 mm and the separation speed as 5.0 mm/s for the fourth button. have.

And, when button 0 is pressed in the gap manipulation unit 530 , the gap control unit 520 may move the metal rods to their original positions to bring the two into contact.

7 is a block diagram of a data collector according to an embodiment.

Referring to FIG. 7 , the data collector 130 may include a data sensing unit 710 , a data processing unit 720 , a data analysis unit 730 , and a data communication unit 740 .

The data sensing unit 710 may receive a sensing signal from the sensor and convert the sensing signal into digital data using an analog-to-digital converter.

The data processing unit 720 may Fourier transform digital data. The Fourier transform may be a discrete-time Fourier transform (DTFT), and the number of frequencies and the length of a sequence of the DTFT may be adjusted by user setting data or programmed setting data received from a server.

The data analysis unit 730 may determine whether an arc is generated by analyzing the Fourier-transformed frequency data. The data analysis unit 730 extracts the test frequency band component value of the test frequency band, and when the test frequency band component value exceeds the reference value, it may be determined that an arc has occurred.

The data analysis unit 730 may collect several frequency data sets - for example, 12 frequency data sets - and transmit them to the server to display or store them on the screen.

The data analysis unit 730 may perform Fourier transform using a predetermined number of sensing signals or sensing signals received for a predetermined time, where the predetermined number or predetermined time may be set by the server.

The data communication unit 740 may receive the setting data from the server and apply it to the data processing unit 720 and the data analysis unit 730 , and may transmit the frequency data generated by the data analysis unit 730 to the server. .

8 is a configuration diagram of a server according to an embodiment.

Referring to FIG. 8 , the server 140 may include a server communication unit 810 , a server control unit 820 , and a server display unit 830 .

The server communication unit 810 may communicate with the data collector and the gap controller, transmit user setting data or programmed setting data, and receive frequency data from the data collector.

The server controller 820 may generate user setting data by recognizing a user operation, and may generate setting data according to an operation of an internal program.

The server controller 820 may recognize a load current according to an internal program and set an indication value for a separation distance and a separation speed according to the load current. For example, the server controller 820 may receive the DC component value of the load current flowing from the data collector to the electric wire, and transmit the separation distance and separation speed indication values preset according to the magnitude of the DC component value to the gap controller. .

The server controller 820 may generate setting data so that the arc test is repeatedly performed according to an internal program. For example, the server controller 820 may transmit the setting data to the gap controller at the first time to control the arc generating device at the first spacing distance and the first spacing speed. Then, the server controller 820 may receive the frequency data from the data collector at the first time and instruct the gap controller to return to the original position to complete the first arc test. In addition, the server controller 820 may repeat the same arc test as the first time at the second time and the subsequent N-th time (N is a natural number greater than or equal to 2).

The server display unit 830 may display a user manipulation picture on the screen to recognize the user manipulation, and display frequency data on the screen to indicate the result of the arc test.

Terms such as "include", "comprise" or "have" described above mean that the corresponding component may be embedded unless otherwise stated, so it does not exclude other components. It should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims

A first metal rod and a second metal rod disposed to face each other in one direction in a current path, a first body fixedly coupled to a support plate and standing upward, and on which the first metal rod is mounted, a rail disposed in the one direction on the support plate an arc generator including a second body on which the second metal rod is mounted and movable along the rail using wheels, and a body mover that is fixedly coupled to the support plate and moves the second body using an electric motor;

a gap controller that transmits a control signal to the body mover to control the moving distance and the moving speed of the second body, has a plurality of buttons, and matches and stores a specific moving distance and moving speed value for each button;

a data collector for sensing the current of the one current path, generating digital data by converting the sensing signal to analog to digital, and generating frequency data by Fourier transforming the digital data; and

and a server that transmits user setting data to the gap controller and the data collector and displays the frequency data on a screen,

The first body includes a first lower body and a first upper body, a tunnel space is formed in the first lower body, and a part of the rail is inserted into the tunnel space,

The rail includes two sub-rails, and each sub-rail has a rail groove and a rail mount elongated in the one direction, and the wheels have wheel grooves and wheel mounts corresponding to the rail groove and the rail mount, and have upper and lower sides and It can move in the one direction while being fixed to the rail in the downward direction (gravity direction),

The gap controller includes an information storage medium of one of a register and a memory, and the gap controller stores indication values for the movement distance and movement speed of the second body in the information storage medium and repeatedly receives the control signal. can create,

When a predetermined time elapses after moving the second body to the arc generation distance, the gap controller operates a relay disposed in the one current path to block the arc generation,

The server transmits and receives data through serial communication with the gap controller, and the arc test apparatus capable of controlling the moving distance and moving speed of the second body differently according to the magnitude of the DC component value of the load current flowing through the one current path .
According to claim 1,

The data collector,

An arc test apparatus for determining whether an arc has occurred using the frequency data, and transmitting data after determining that an arc has occurred among the frequency data to the server.