High-precision AC and DC arc test device

Abstract

The invention discloses a high-precision AC and DC arc test device, comprising a back plate and a base, a socket is fixedly installed on the back plate, the socket is connected to a power supply, a servo motor is fixedly installed on the base, the output shaft of the servo motor is connected to one end of a ball screw through a coupling, the other end of the ball screw is installed on a screw support seat, a nut seat is installed on the ball screw, a slider is fixedly installed on the nut seat, a plug is fixedly installed on the slider, the plug is aligned with the socket, and it is ensured that the plug can be inserted into the socket along the movement of the screw. The invention has the advantages of simple operation and wide application range.

Description

Technical Field

[0001] The invention relates to the field of fault arc detection, in particular to a high-precision AC and DC arc testing device. Background Art

[0002] In daily life, household appliances are powered on and off by plugging and unplugging plugs and sockets. During the power-on and power-off process, visible "sparks" of different brightness may be generated between the plug and the socket. These sparks may cause safety hazards such as fires, affecting the safety of our lives and property. Therefore, it is necessary to study the generation and growth mechanism of socket arcs, reproduce the DC arcing and AC arcing phenomena of sockets, and observe the voltage and current of the arcing process. Through experimental research, the key factors affecting arcing are determined, which helps to improve the performance of the socket structure and materials, increase the safety of the socket, and reduce safety hazards. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to design a high-precision AC and DC arc testing device.

[0004] The technical solution of the present invention to achieve the above-mentioned purpose is a high-precision AC / DC arc test device, comprising a back plate and a base, a socket is fixedly installed on the back plate, the socket is connected to a power supply, a servo motor is fixedly installed on the base, the output shaft of the servo motor is connected to one end of a ball screw through a coupling, the other end of the ball screw is installed on a screw support seat, and a nut seat is installed on the ball screw.

[0005] A slider is fixedly installed on the nut seat, and a plug is fixedly installed on the slider. The plug is aligned with the socket, and it is ensured that the plug can be inserted into the socket by moving along the screw rod;

[0006] It also includes a high-speed camera, the lens of which is aimed at the socket jack, the high-speed camera collects spark images generated by the plug being inserted into or pulled out of the socket, the high-speed camera is connected to the industrial computer and transmits the collected spark images to the industrial computer;

[0007] Install a Hall current sensor on the live wire of the socket power supply, and install a Hall voltage sensor between the zero and live wires of the plug and socket;

[0008] The Hall current sensor and the Hall voltage sensor are both connected to the signal input of the high-speed data acquisition card, and both transmit signals to the high-speed data acquisition card, and the output of the high-speed data acquisition card is connected to the signal input of the industrial computer.

[0009] The industrial computer uses Labview as the interface programming language to design the human-computer interaction interface of the wall socket arc test device.

[0010] A power supply voltage and phase angle calculation model at the plug-in start time based on real-time socket power supply voltage acquisition data is established in the interface of the industrial computer.

[0011] The power supply voltage and phase angle calculation model at the plug-in start-up time based on real-time socket power supply voltage acquisition data uses single-frequency measurement in the Express-VI module provided by the labview system to obtain the frequency, amplitude and effective value of the power supply voltage.

[0012] A plug-in / plug-out start-up collaborative control model based on the socket power supply voltage and the relative distance between the plug and socket is established in the interface of the industrial computer.

[0013] The calculation model of the plug-in start-up coordinated control based on the socket power supply voltage and the relative distance between the plug and the socket is based on the AC arc test as an example s=v*t, where s is the distance the plug is inserted into the socket, and v is the movement speed of the plug inserted into the socket. When it is detected that the power supply voltage reaches the target voltage, the control motor starts to move. In order to make the plug inserted into the socket at the target voltage moment, t should be a positive integer multiple of 0.02s of the AC power supply cycle.

[0014] The plug is connected to an electrical load.

[0015] The servo motor is connected to an AC power supply via a driver, and a signal input of the driver is connected to a signal output of a controller.

[0016] Beneficial Effects

[0017] The high-precision AC and DC arc testing device manufactured using the technical solution of the present invention has the following advantages:

[0018] 1. It can test at which contact distance the arc burns most violently under different voltages, providing data support for proposing arc suppression solutions;

[0019] 2. The device is easy to operate and suitable for a variety of different voltage conditions. It can not only test household sockets, but also sockets in some working conditions or higher voltage sockets;

[0020] 3. The device can collect rich information, including arc voltage, current, arc pictures, and power supply voltage fluctuations when the arc burns, which is conducive to data accumulation and theoretical analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the high-precision AC and DC arc testing device of the present invention;

[0022] Figure 2 is a schematic diagram of the high-precision AC and DC arc testing device of the present invention;

[0023] Figure 3It is a schematic diagram of arc voltage and current detection principle of the high-precision AC and DC arc test device of the present invention;

[0024] In the figure, 1. back plate; 2. base; 3. socket; 4. servo motor; 5. coupling; 6. ball screw; 7. screw support seat; 8. nut seat; 9. plug; 10. high-speed camera; 11. Hall current sensor; 12. Hall voltage sensor; 13. slider; 14. load; 15. high-speed data acquisition card; 16. industrial computer. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1-3 As shown, the invention of the present application is a high-precision AC / DC arc test device, comprising a back plate 1 and a base 2, a socket 3 is fixedly mounted on the back plate, the socket is connected to a power supply, a servo motor 4 is fixedly mounted on the base, the output shaft of the servo motor is connected to one end of a ball screw 6 through a coupling 5, the other end of the ball screw is mounted on a screw support seat 7, a nut seat 8 is mounted on the ball screw,

[0026] A slider 13 is fixedly mounted on the nut seat, and a plug 9 is fixedly mounted on the slider. The plug is aligned with the socket, and the plug is ensured to move along the screw rod and be inserted into the socket.

[0027] It also includes a high-speed camera 10, the lens of which is aimed at the socket jack, the high-speed camera collects the spark image generated by the plug being inserted into or pulled out of the socket, the high-speed camera is connected to the industrial computer 16 and transmits the collected spark image to the industrial computer;

[0028] A Hall current sensor 11 is installed on the live wire of the socket power supply, and a Hall voltage sensor 12 is installed between the zero and live wires of the plug and the socket;

[0029] The Hall current sensor and the Hall voltage sensor are both connected to the signal input of the high-speed data acquisition card 15 , and both transmit signals to the high-speed data acquisition card, and the output of the high-speed data acquisition card is connected to the signal input of the industrial computer.

[0030] The electronic devices used in this technical solution include:

[0031] Drivers and controllers for servo motor machines;

[0032] High-speed camera: what type of high-speed camera to choose;

[0033] During the implementation of this technical solution, personnel in this field need to connect all electrical components in this case with their corresponding power supplies through wires, and should select a suitable controller according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between each electrical component is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and does not explain the electrical control.

[0034] In this technical solution, an industrial computer is used as the monitoring center and Labview is used as the interface programming language to design the human-computer interaction interface of the wall socket arc test device, establish a power supply voltage and its phase angle calculation model at the plug-in start time based on the real-time socket power supply voltage acquisition data, establish a plug-in start collaborative control model based on the socket power supply voltage and the relative distance between the plug and socket, and design the test working sequence; the plug-in and plug-out actions of the plug and socket are executed through the combination of servo motors, screw rods and sliders to realize the plug-in and plug-out process simulation; at the same time, a high-speed data acquisition board is used to collect the changes in electrical signals during the plug-in and plug-out process, so as to realize subsequent research and calculations.

[0035] In the present technical scheme, the arc gap is controllable by controlling the stroke of the motor by adjusting the number of revolutions of the motor, and a stable arc burning process can be demonstrated. The arc starting, burning and arc extinction processes under different gaps and voltages can be studied by adjusting the arc gap and voltage level, and the arc growth can be filmed and studied by a high-speed camera. The plug insertion and removal speed can be changed by adjusting the speed of the motor, so as to study the influence of different plugging and removal speeds on the arc burning process. The voltage value and its phase angle detection value can be used to synchronously trigger the measurement and recording of the arc voltage, current and image, and the plug stroke and power supply voltage can be coordinated to control the AC power supply to reach the specified plugging and removal position at the specified phase angle.

[0036] As a preferred solution, further, the industrial computer uses Labview as the interface programming language to design the human-computer interaction interface of the wall socket arc test device.

[0037] As a preferred solution, further, a power supply voltage and phase angle calculation model for the plug-in start-up moment based on the real-time socket power supply voltage acquisition data is established in the interface of the industrial computer; the power supply voltage and phase angle calculation model for the plug-in start-up moment based on the real-time socket power supply voltage acquisition data utilizes the single-frequency measurement in the Express-VI module that comes with the labview system to obtain the frequency, amplitude and effective value of the power supply voltage.

[0038] As a preferred solution, further, a model of plug-in start-up coordinated control based on the socket power supply voltage and the relative distance between the plug and the socket is established in the interface of the industrial computer, taking the AC arc test as an example s=v*t, where s is the distance the plug is inserted into the socket, and v is the movement speed of the plug inserted into the socket. When it is detected that the power supply voltage reaches the target voltage, the control motor starts to move. In order to make the plug inserted into the socket at the target voltage moment, t should be a positive integer multiple of 0.02s of the AC power supply cycle.

[0039] As a preferred solution, further, the plug is connected to an electrical load.

[0040] As a preferred solution, further, the servo motor is connected to an AC power supply via a driver, and a signal output of a controller of the servo motor is connected to a signal input of the driver.

[0041] The process of testing the technical solution of this application is as follows:

[0042] Under the conditions of AC 220V and phase angle 30 degrees, the plug and socket arc test steps are as follows:

[0043] (1) Check whether the equipment is intact, start the industrial computer safely, and check whether the LabVIEW interface can run normally;

[0044] (2) Remove the camera cover, test the camera function, and adjust the camera focus appropriately to ensure clear imaging;

[0045] (3) Turn on the motor power supply, use the industrial computer to control the motor, test whether the motor moves normally, and test whether the start, stop, and phase start functions of the motor are normal.

[0046] (4) Connect the AC power socket to the power source and test whether the power output value is normal.

[0047] (5) Press the start button on the operation interface of the industrial computer, and the motor will stop at the specified position; click to set the target phase angle, and press the forward button on the operation interface to start the insertion process until the plug is fully inserted into the socket; during the process of inserting the plug into the socket, the arc voltage, current value and arc image are measured and recorded, and output as txt and mp4 format files respectively;

[0048] (6) After the power is turned on for a period of time (not less than 30 seconds), press the back button on the operation interface to start the unplugging process; when the plug is pulled out from the socket until it reaches the specified position, measure and record the arc voltage, current value and arc image, and output them as txt and mp4 format files respectively.

[0049] (7) Wait for 2 minutes until the system returns to a cold state.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0051] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A high-precision AC / DC arc test device, comprising a back plate (1) and a base (2), wherein a socket (3) is fixedly mounted on the back plate, the socket is connected to a power supply, a servo motor (4) is fixedly mounted on the base, the output shaft of the servo motor is connected to one end of a ball screw (6) through a coupling (5), the other end of the ball screw is mounted on a screw support seat (7), and a nut seat (8) is mounted on the ball screw, characterized in that: A plug (9) is fixedly mounted on the nut seat, the plug is aligned with the socket, and the plug is ensured to be inserted into the socket by moving along the screw rod; It also includes a high-speed camera (10), the lens of which is aimed at the socket jack, the high-speed camera collects spark images generated when the plug is inserted into or pulled out of the socket, and the high-speed camera is connected to an industrial computer (16) and transmits the collected spark images to the industrial computer; A Hall current sensor (11) is installed on the live wire of the socket power supply, and a Hall voltage sensor (12) is installed between the neutral wire and the live wire of the plug and the socket; The Hall current sensor and the Hall voltage sensor are both connected to the signal input of a high-speed data acquisition card (15), and the Hall current sensor and the Hall voltage sensor both transmit signals to the high-speed data acquisition card, and the output of the high-speed data acquisition card is connected to the signal input of an industrial computer; The plug is connected to an electrical load (14), the servo motor is connected to an AC power supply via a driver, and a signal output of the controller is connected to a signal input of the driver; The industrial computer adopts Labview as the interface programming language to design the human-computer interaction interface of the wall socket arc test device.

2. The high-precision AC and DC arc testing device according to claim 1, characterized in that: A power supply voltage and phase angle calculation model at the plug-in start time based on real-time socket power supply voltage acquisition data is established in the interface of the industrial computer.

3. The high-precision AC / DC arc testing device according to claim 2, characterized in that: The power supply voltage and phase angle calculation model at the plug-in start-up time based on real-time socket power supply voltage acquisition data uses single-frequency measurement in the Express-VI module provided by the labview system to obtain the frequency, amplitude and effective value of the power supply voltage.

4. The high-precision AC / DC arc testing device according to claim 1, characterized in that: A plug-in / plug-out start-up collaborative control model based on the socket power supply voltage and the relative distance between the plug and socket is established in the interface of the industrial computer.

5. The high-precision AC / DC arc testing device according to claim 4, characterized in that: The model of plug-in start-up coordinated control based on the socket power voltage and the relative distance between the plug and the socket is s=v*t, where s is the distance the plug moves when inserted into the socket, and v is the speed of the plug when inserted into the socket. When the power supply voltage is detected to reach the target voltage, the control motor starts to move. In order to make the plug inserted into the socket at the target voltage moment, t should be a positive integer multiple of 0.02s of the AC power cycle.

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