Transformer through-flow test voltage regulator based on IGBT

Abstract

The invention relates to an IGBT-based transformer through-current test voltage regulator, which comprises a protection module, a control module, an IGBT driving module, an IGBT module, a current acquisition module, a signal amplification module and a remote control device, and is characterized in that the input of the protection module is connected with a three-phase alternating current power supply, and the output end of the protection module is connected with the input end of the IGBT module; the output end of the IGBT module is connected with the input end of the current acquisition module and the high-voltage side of the transformer, the output end of the current acquisition module is connected with the control module, the control module is connected with the input end of the IGBT driving module, the output end of the IGBT driving module is connected with the control end of the IGBT module, and the control module is in wireless communication connection with the remote control device. The IGBT is adopted, a boosting transformer is abandoned, the equipment weight is light, and on-site construction, installation and wiring are facilitated. The remote control instrument has a remote control function, and is convenient to remotely operate when being moved in a plurality of pilot sites.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to an IGBT-based transformer through-current test voltage regulator. Background Art

[0002] During the three-phase current flow test of the main transformer, a three-phase 220V voltage is used to access one side of the main transformer, and the current magnitude and voltage and current phase are measured on the other side of the main transformer to conduct the current flow test. When the booster is not used, the magnitude of the boost cannot be controlled and only a fixed voltage can be added. Traditional booster equipment is large in size and heavy in weight, which is not convenient for on-site transportation, installation and wiring. The internal voltage is high and there is a certain risk of electric shock. At the same time, during the main transformer current flow test, it is necessary to operate separately on each side of the main transformer, which requires multiple operators, which is very inconvenient. Summary of the invention

[0003] The present invention provides an IGBT-based transformer current flow test voltage regulator, which solves at least one technical problem mentioned in the background technology.

[0004] The technical solution of the present invention is as follows: A transformer current test voltage regulator based on IGBT, comprising: a protection module, a control module, an IGBT driving module, an IGBT module, a current acquisition module, a signal amplification module and a remote control device, wherein the input of the protection module is connected to a three-phase AC power supply, the output of the protection module is connected to the input of the IGBT module, the output of the IGBT module is connected to the input of the current acquisition module and the high-voltage side of the transformer, the output of the current acquisition module is connected to the control module, the control module is connected to the input of the IGBT driving module, the output of the IGBT driving module is connected to the control of the IGBT module, and the control module is wirelessly connected to the remote control device; The control module is used to generate a PWM signal, the IGBT driving module modulates the PWM signal into a pulse signal for controlling the IGBT driving module, the remote control device is used to provide a remote control signal to the control module, the current acquisition module is used to collect the current at the output end of the IGBT module to generate a current signal, and the control module determines whether the transformer is faulty based on the current signal.

[0005] Furthermore, the remote control device includes a main control module, a communication module, and a human-computer interaction module. The main control module is connected to the communication module and the human-computer interaction module respectively. The main control module is connected to the control module through the communication module. The human-computer interaction module is used to provide a human-computer interaction signal to the main control module according to the user's operation, and the main control module is used to send a remote control signal to the control module according to the human-computer interaction signal.

[0006] Furthermore, the control module receives the current signal output by each phase current acquisition module to obtain the current parameter of each phase; When the current parameter of any phase is greater than the current threshold, the fault judgment is entered; When the current parameter of any phase is less than the current threshold, it is determined as a phase failure and the IGBT module is turned off; When the difference between any two-phase current parameters is greater than the three-phase balance threshold, it is determined as a three-phase unbalanced fault and the IGBT module is turned off; When the current parameter of any phase is greater than the overcurrent threshold, it is determined as an overcurrent fault and the IGBT module is turned off.

[0007] Furthermore, the three-phase balance threshold is the product of a preset ratio and the sum of three-phase current parameters.

[0008] Furthermore, the main control module adopts an ESP32 module, and the communication module adopts a WIFI module.

[0009] Furthermore, the control module adopts a single chip microcomputer.

[0010] Furthermore, the protection module adopts a molded case circuit breaker.

[0011] Furthermore, the main control module is also connected to a display screen and a keyboard.

[0012] Furthermore, the signal amplification module adopts the MCP6002 chip.

[0013] Furthermore, an isolation resistor is provided between the signal amplification module and the control module.

[0014] Beneficial effects of the present invention: The present invention adopts IGBT and abandons the step-up transformer, the equipment is light in weight, and is convenient for on-site construction, installation and wiring. In addition to conventional key operation, the present invention has a remote control function through a remote control module, which is convenient for remotely operating the instrument when moving in multiple pilot sites, so that the staff can stay away from the test power and prevent electric shock from 220V power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural block diagram of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the remote control device of the present invention.

[0017] Figure 3 It is a detection flow chart of the control module in the present invention.

[0018] Figure 4 It is the judgment standard of the control module in the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. The described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0020] In one technical solution of the present invention, Figure 1 1 is a structural block diagram of a specific structure of an IGBT-based transformer current test voltage regulator according to the present invention, such as Figure 1 As shown, the present invention includes: A protection module 1, a control module 2, an IGBT driving module 3, an IGBT module 4, a current acquisition module 5, a signal amplification module 6 and a remote control device 7, wherein the input of the protection module 1 is connected to a three-phase AC power supply, the output of the protection module 1 is connected to the input of the IGBT module 4, the output of the IGBT module 4 is connected to the input of the current acquisition module 5 and the high-voltage side of the transformer, the output of the current acquisition module 5 is connected to the control module 2, the control module 2 is connected to the input of the IGBT driving module 3, the output of the IGBT driving module 3 is connected to the control end of the IGBT module 4, and the control module 2 is wirelessly connected to the remote control device 7.

[0021] The control module 2 is used to generate a PWM signal, the IGBT driving module 3 modulates the PWM signal into a pulse signal for controlling the IGBT driving module 3, the remote control device 7 is used to provide a remote control signal to the control module 2, the current acquisition module 5 is used to collect the current at the output end of the IGBT module 4 and generate a current signal, and the control module 2 determines whether the transformer is faulty based on the current signal.

[0022] It should be noted that this device corresponds to three-phase electricity. Therefore, the output end of the protection module 1 has three lines, and an IGBT module 4 and a current acquisition module 5 are arranged on each line.

[0023] The control module 2 uses a single-chip microcomputer, specifically a STM32F429, which is connected to the power module 10. The IGBT module 4 is a voltage regulating on-off control circuit composed of IGBT tubes, and the IGBT drive module 3 is a circuit for generating and driving the IGBT tube. Both are conventional technical means in this field, specifically a 2SP0115T2A0-17 module can be used, which integrates the IGBT module 4 and its drive module. Figure 1, D1 and D2 represent the IGBT module 4 of the A phase, D3 and D4 represent the IGBT module 4 of the B phase, and D5 and D6 represent the IGBT module 4 of the C phase.

[0024] The protection module 1 can specifically adopt a molded case circuit breaker to protect the circuit. The signal amplification module 6 adopts an MCP6002 chip to amplify the current input signal. The output end of MCP6002 is connected to the AD port of the STM32F429 microcontroller through an isolation resistor for the microcontroller to collect three-phase current.

[0025] In one embodiment of the present technical solution, the main control module 71 is also connected to a display screen 8 and a keyboard 9. The display screen 8 and the keyboard 9 are used to realize human-computer interaction. In addition to the display screen 8 and the keyboard 9, the single-chip microcomputer also provides a wireless communication function through the wireless communication module 72.

[0026] In one embodiment of the present technical solution, an isolation resistor is provided between the signal amplification module 6 and the control module 2 , and the isolation resistor is used to isolate the input and output currents.

[0027] In one embodiment of the present technical solution, Figure 2 As shown, the remote control device 7 includes a main control module 71, a communication module 72, and a human-machine interaction module 73. The main control module 71 is connected to the communication module 72 and the human-machine interaction module 73 respectively. The main control module 71 is connected to the control module 2 through the communication module 72. The human-machine interaction module 73 is used to provide a human-machine interaction signal to the main control module 71 according to the operation of the user. The main control module 71 is used to send a remote control signal to the control module 2 according to the human-machine interaction signal. Among them, the human-machine interaction module 73 can be a touch screen, the main control module 71 adopts an ESP32 module, and the communication module 72 adopts a WIFI module.

[0028] In one embodiment of the present technical solution, Figure 3 and Figure 4 As shown, the judgment process is as follows: the control module 2 receives the current signal output by each phase current acquisition module 5 and obtains the current parameter of each phase; When the current parameter of any phase is greater than the current threshold, the fault judgment is entered; when the current of all phases is less than the current threshold, the judgment of the current cycle is ended and the judgment of the next cycle is entered; When the current parameter of any phase is less than the current threshold, it is determined as a phase failure and the IGBT module 4 is turned off; When the difference between any two-phase current parameters is greater than the three-phase balance threshold, it is determined to be a three-phase unbalanced fault, and the IGBT module 4 is turned off; When the current parameter of any phase is greater than the overcurrent threshold, it is determined as an overcurrent fault and the IGBT module 4 is turned off.

[0029] The current threshold may be 0.02A, which may be set according to actual conditions.

[0030] The three-phase balance threshold is the product of a preset ratio and the sum of the three-phase current parameters. Generally, the preset ratio is 2%, which can be set according to actual conditions.

[0031] The overcurrent threshold can be 100A and can be set according to actual conditions.

[0032] In one embodiment of the present technical solution, the control module 2 is also connected to a temperature detection module 10, which is used to detect the temperature of the transformer. When the transformer temperature is detected to be greater than the temperature threshold, it is determined to be an over-temperature fault and the IGBT module 4 is turned off. The temperature threshold is generally 80°C and can be set according to actual conditions. It should be noted that the over-temperature fault judgment should also be performed when there is current in any phase. The temperature detection module 10 can use DS18B20.

[0033] The working principle of the present invention is as follows: Figure 1 As shown, the three-phase AC power supply is connected at A1, B1, and C1, and is connected to the high-voltage side of the transformer at A2, B2, and C2.

[0034] The microcontroller monitors the output current through CT1, CT2, and CT3. The output end of MCP6002 is connected to the AD port of STM32F429 microcontroller through an isolation resistor. The input and output currents are isolated by MCP6002 and the isolation resistor, which increases the driving capability of the current sampling circuit and allows the microcontroller to collect three-phase current.

[0035] The single chip microcomputer outputs a PWM signal, which is connected to the IGBT driving module 3, and the IGBT driving module 3 provides an opening and closing pulse signal for the IGBT module 4. In addition to the LCD and keyboard 9, the single chip microcomputer also provides a wireless communication function through a WIFI module.

[0036] The main chip of the remote control device 7 is an ESP32 single-chip microcomputer module, which has a WIFI function and communicates with the control module 2 through the ESP-now point-to-point protocol.

[0037] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A transformer current test voltage regulator based on IGBT, characterized in that: include: A protection module (1), a control module (2), an IGBT drive module (3), an IGBT module (4), a current acquisition module (5), a signal amplification module (6) and a remote control device (7), wherein the input of the protection module (1) is connected to a three-phase alternating current power supply, the output of the protection module (1) is connected to the input of the IGBT module (4), the output of the IGBT module (4) is connected to the input of the current acquisition module (5) and the high-voltage side of the transformer, the output of the current acquisition module (5) is connected to the control module (2), the control module (2) is connected to the input of the IGBT drive module (3), the output of the IGBT drive module (3) is connected to the control of the IGBT module (4), and the control module (2) is wirelessly connected to the remote control device (7); The control module (2) is used to generate a PWM signal, the IGBT drive module (3) modulates the PWM signal into a pulse signal for controlling the IGBT drive module (3), the remote control device (7) is used to provide a remote control signal to the control module (2), the current acquisition module (5) is used to acquire the current at the output end of the IGBT module (4) to generate a current signal, and the control module (2) determines whether the transformer is faulty based on the current signal.

2. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: The remote control device (7) comprises a main control module (71), a communication module (72), and a human-machine interaction module (73); the main control module (71) is connected to the communication module (72) and the human-machine interaction module (73) respectively; the main control module (71) is connected to the control module (2) via the communication module (72); the human-machine interaction module (73) is used to provide a human-machine interaction signal to the main control module (71) according to a user operation; and the main control module (71) is used to send a remote control signal to the control module (2) according to the human-machine interaction signal.

3. The IGBT-based transformer current test voltage regulator according to claim 2, characterized in that: The main control module (71) adopts an ESP32 module, and the communication module (72) adopts a WIFI module.

4. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: The control module (2) receives the current signal output by each phase current acquisition module (5) to obtain the current parameter of each phase; When the current parameter of any phase is greater than the current threshold, the fault judgment is entered; When the current parameter of any phase is less than the current threshold, it is determined as a phase failure and the IGBT module is turned off (4); When the difference between any two-phase current parameters is greater than the three-phase balance threshold, it is determined to be a three-phase unbalanced fault and the IGBT module is turned off (4); When the current parameter of any phase is greater than the overcurrent threshold, it is determined to be an overcurrent fault and the IGBT module (4) is turned off.

5. The IGBT-based transformer current test voltage regulator according to claim 4, characterized in that: The three-phase balance threshold is the product of a preset ratio and the sum of the three-phase current parameters.

6. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: The control module (2) adopts a single chip microcomputer.

7. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: The protection module (1) adopts a molded case circuit breaker.

8. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: The main control module (71) is also connected to a display screen (8) and a keyboard (9).

9. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: The control module (2) is further connected to a temperature detection module (10), and the temperature detection module (10) is used to detect the temperature of the transformer. When the transformer temperature is detected to be greater than a temperature threshold, it is determined to be an over-temperature fault.

10. The IGBT-based transformer current test voltage regulator according to claim 1, characterized in that: An isolation resistor is provided between the signal amplification module (6) and the control module (2).

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