Control cabinet protection system, portable electricity testing device and wind turbine generator set

Abstract

The utility model discloses a control cabinet protection system, a portable electricity testing device and a wind turbine generator set, and belongs to the field of electric power. The control cabinet protection system comprises a portable electricity testing device which comprises a magnetic field induction circuit and a wireless transmission circuit, the output end of the magnetic field induction circuit is connected with the input end of the wireless transmission circuit, and the magnetic field induction circuit is configured to induce a magnetic field of a main loop conducted by a control cabinet and transmit a first trigger signal to the wireless transmission circuit, the wireless transmitting circuit is configured to transmit a wireless signal to the outside in response to the first trigger signal; and the control cabinet control device is in wireless communication connection with the portable electricity testing device, is connected with a switch unit arranged in the main loop, and is configured to respond to the received wireless signal and send a turn-off signal to the switch unit so as to disconnect the main loop. According to the embodiment of the invention, the safety of maintenance and use of the control cabinet can be improved.

Description

Technical Field

[0001] This application belongs to the field of power, and in particular relates to a control cabinet protection system, a portable voltage testing device, and a wind turbine. Background Technology

[0002] During the maintenance and use of electrical equipment such as control cabinets, operators are required to operate the equipment. However, due to a lack of safety awareness, such as touching the power source without confirming that the power is off, or performing operations without understanding electrical safety operating procedures, electric shock accidents can occur, endangering the lives of operators. Utility Model Content

[0003] This application provides a control cabinet protection system, a portable voltage testing device, and a wind turbine, which can improve the safety of control cabinet maintenance and use.

[0004] In a first aspect, embodiments of this application provide a control cabinet protection system, comprising: a portable voltage detector, including a magnetic field sensing circuit and a wireless transmission circuit, wherein the output terminal of the magnetic field sensing circuit is connected to the input terminal of the wireless transmission circuit, the magnetic field sensing circuit is configured to sense the magnetic field of the main circuit of the control cabinet and transmit a first trigger signal to the wireless transmission circuit, and the wireless transmission circuit is configured to transmit a wireless signal in response to the first trigger signal; and a control cabinet control device, wirelessly connected to the portable voltage detector and connected to a switch unit disposed in the main circuit, configured to send a shutdown signal to the switch unit in response to the received wireless signal to disconnect the main circuit.

[0005] In some possible embodiments, the magnetic field sensing circuit includes: a sensing antenna configured to sense the magnetic field of the main circuit; and a timer chip connected to the sensing antenna and the input of the wireless transmission circuit, configured to generate a first trigger signal in response to the magnetic field of the main circuit and transmit it to the wireless transmission circuit via its output.

[0006] In some possible embodiments, the portable voltage detector further includes a first power supply; the trigger pin and threshold pin of the timer chip are connected to the induction antenna; the reset pin, discharge pin and power supply pin of the timer chip are connected to the positive terminal of the first power supply; the ground pin of the timer chip is connected to the negative terminal of the first power supply; the control voltage pin of the timer is connected to the ground pin through a capacitor; and the output terminal of the magnetic field induction circuit includes the output pin of the timer chip.

[0007] In some possible embodiments, the portable voltage detector also includes an alarm circuit connected to the output of the magnetic field sensing circuit, the alarm circuit being configured to issue an alarm signal in response to a first trigger signal.

[0008] In some possible embodiments, the magnetic field sensing circuit includes a timer chip; one end of the alarm circuit is connected to the output pin of the timer chip, and the other end of the alarm circuit is connected to the ground pin of the timer chip.

[0009] In some possible embodiments, the control cabinet control device includes an electrically connected wireless receiving circuit and a control unit; the wireless receiving circuit is configured to send a second trigger signal to the control unit in response to a received wireless signal; the control unit is connected to a switching unit and is configured to send a shutdown signal to the switching unit in response to the second trigger signal.

[0010] In some possible embodiments, the control cabinet control device further includes a second power supply, the power intake terminal of which is connected to the main circuit before the switching unit, and the power supply terminal of which is connected to the wireless receiving circuit and the control unit.

[0011] In some possible embodiments, the control cabinet protection system further includes: a touch switch disposed in the control cabinet, the touch switch being configured to send an off signal to the switching unit in response to a user's touch operation, thereby disconnecting the main circuit.

[0012] Secondly, this application provides a portable voltage testing device applied to the control cabinet of a wind turbine. The portable voltage testing device includes: a magnetic field induction circuit configured to sense the magnetic field of the main circuit of the control cabinet and generate a first trigger signal; and a wireless transmission circuit, the input terminal of which is connected to the output terminal of the magnetic field induction circuit. The wireless transmission circuit is configured to transmit a wireless signal in response to the first trigger signal transmitted from the magnetic field induction circuit, so that the wireless signal is received by the control cabinet control device, which is used to control the switching unit located in the main circuit of the control cabinet.

[0013] Thirdly, embodiments of this application provide a wind turbine generator, including: a control cabinet; and a control cabinet protection system according to the first aspect.

[0014] This application provides a control cabinet protection system, a portable voltage detector, and a wind turbine. The control cabinet protection system includes a portable voltage detector and a control cabinet control device. The portable voltage detector includes a magnetic field induction circuit and a wireless transmission circuit. The magnetic field induction circuit can sense the magnetic field generated by the main circuit of the control cabinet, forming a loop voltage and sending a first trigger signal to the wireless transmission circuit to trigger the wireless transmission circuit to transmit a wireless signal. The control cabinet control device is connected to a switch unit that controls the on / off state of the main circuit. When the control cabinet control device receives the wireless signal, it triggers a shutdown signal to be sent to the switch unit. The switch unit opens, the main circuit is disconnected, and correspondingly, the control cabinet loses power. In other words, when an operator brings the portable voltage detector to the vicinity of the control cabinet, it will trigger the portable voltage detector to send a wireless signal, thereby controlling the main circuit to disconnect through the control cabinet control device. This allows the control cabinet to be automatically de-energized before the operator operates it, avoiding electric shock accidents and improving the safety of control cabinet maintenance and use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the architecture of a control cabinet protection system provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the structure of a portable voltage detector provided in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of a portable voltage detector provided in another embodiment of this application;

[0019] Figure 4 A schematic diagram of the structure of a portable voltage detector provided in yet another embodiment of this application;

[0020] Figure 5 A schematic diagram illustrating an example of a portable voltage testing device provided in an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the architecture of a control cabinet protection system provided in another embodiment of this application;

[0022] Figure 7 This is a schematic diagram of the architecture of a control cabinet protection system provided in another embodiment of this application. Detailed Implementation

[0023] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0024] During the maintenance and use of electrical equipment such as control cabinets, operators are required to operate the equipment. However, due to a lack of safety awareness, such as touching the power source without confirming that the power is off, or performing operations without understanding electrical safety operating procedures, electric shock accidents can occur, endangering the lives of operators.

[0025] This application provides a control cabinet protection system, a portable voltage detector, and a wind turbine. The control cabinet protection system includes a portable voltage detector and a control cabinet control device. The portable voltage detector includes a magnetic field induction circuit and a wireless transmission circuit. The magnetic field induction circuit senses the magnetic field of the main circuit of the control cabinet, and the wireless transmission circuit transmits a wireless signal. Upon receiving the wireless signal, the control cabinet control device sends a shutdown signal to the switching unit used to control the on / off state of the main circuit of the control cabinet, thereby disconnecting the main circuit. When an operator carrying the portable voltage detector enters the vicinity of the control cabinet, the main circuit of the control cabinet can be triggered to disconnect, preventing live operation and thus avoiding electric shock accidents, improving the safety of control cabinet maintenance and use.

[0026] The control cabinet protection system, portable voltage testing device and wind turbine provided in this application are described below.

[0027] The first aspect of this application provides a control cabinet protection system that can be applied to the maintenance and use of control cabinets. Figure 1 This is a schematic diagram of the architecture of a control cabinet protection system provided in one embodiment of this application, as shown below. Figure 1 As shown, the control cabinet protection system includes a portable voltage detector 10 and a control cabinet control device 20. The control cabinet control device 20 is wirelessly connected to the portable voltage detector 10, and they can communicate wirelessly. The control cabinet 30 may include electrical equipment. Figure 1In this control cabinet 30, electrical equipment 1 and electrical equipment 2 may be included. Electrical equipment 1 and electrical equipment 2 are located in the main circuit, which is also equipped with a switch unit 31. The switching of the switch unit 31 controls the on / off state of the main circuit of the control cabinet 30. When the main circuit of the control cabinet 30 is on, the electrical equipment in the control cabinet 30 can receive power, that is, the control cabinet 30 is energized; when the main circuit of the control cabinet 30 is off, the electrical equipment in the control cabinet 30 cannot receive power, that is, the control cabinet 30 is de-energized. Operating the control cabinet 30 is safe and reliable when it is de-energized. The control cabinet control device 20 is connected to the switch unit 31. The control cabinet control device 20 can control the on / off state of the switch unit 31. The switch unit 31 may include, but is not limited to, contactors or circuit breakers and other switching devices.

[0028] Figure 2 This is a schematic diagram of the structure of a portable voltage detector provided in an embodiment of this application, as shown below. Figure 2 As shown, the portable voltage detector 10 may include a magnetic field sensing circuit 11 and a wireless transmission circuit 12. The output terminal of the magnetic field sensing circuit 11 is connected to the input terminal of the wireless transmission circuit 12. The magnetic field sensing circuit 11 is configured to sense the magnetic field of the main circuit of the control cabinet 30 when it is conducting, and transmit a first trigger signal to the wireless transmission circuit 12. The wireless transmission circuit 12 is configured to transmit a wireless signal in response to the first trigger signal. The magnetic field sensing circuit 11 has a sensing antenna 111, which can sense the magnetic field of the main circuit. When the main circuit is conducting, a magnetic field is generated near the control cabinet 30. The magnetic field generated when the main circuit is conducting can be sensed by the sensing antenna 111, and a loop voltage is formed inside the magnetic field sensing circuit 11, thereby transmitting the first trigger signal to the wireless transmission circuit 12. The first trigger signal is an electrical signal, for example, the first trigger signal can be a high-level signal. The wireless transmission circuit 12 receives the first trigger signal and is triggered to transmit a wireless signal.

[0029] The control cabinet control device 20 is configured to send a shutdown signal to the switching unit 31 in response to a received wireless signal, thereby disconnecting the main circuit. The control cabinet control device 20 may include a wireless receiving structure to receive wireless signals emitted by the portable voltage detector 10. Triggered by the wireless signal, the control cabinet control device 20 sends a shutdown signal to the switching unit; the shutdown signal is an electrical signal. The switching unit is triggered by this shutdown signal to perform a shutdown action, thereby disconnecting the main circuit.

[0030] In this embodiment, the control cabinet protection system includes a portable voltage detector 10 and a control cabinet control device 20. The portable voltage detector 10 includes a magnetic field induction circuit 11 and a wireless transmission circuit 12. The magnetic field induction circuit 11 can sense the magnetic field generated by the main circuit of the control cabinet 30, forming a circuit voltage and sending a first trigger signal to the wireless transmission circuit 12 to trigger the wireless transmission circuit 12 to transmit a wireless signal. The control cabinet control device 20 is connected to a switch unit 31 that controls the on / off state of the main circuit. When the control cabinet control device 20 receives the wireless signal, it triggers a shutdown signal to the switch unit 31. The switch unit 31 disconnects, the main circuit is disconnected, and correspondingly, the control cabinet loses power. In other words, when an operator brings the portable voltage detector 10 to the vicinity of the control cabinet, it will trigger the portable voltage detector 10 to send a wireless signal, thereby controlling the main circuit to disconnect through the control cabinet control device 20. This allows the control cabinet 30 to be automatically de-energized before the operator operates it, avoiding electric shock accidents and improving the safety of maintaining and using the control cabinet 30.

[0031] In some embodiments, the magnetic field sensing circuit may include an induction antenna 111 and a timer chip 112, and the portable voltage detector 10 may also include a first power supply 13. Figure 3 This is a schematic diagram of the structure of a portable voltage testing device provided in another embodiment of this application, as shown below. Figure 3 As shown, the timer chip 112 is connected to the induction antenna 111 and the input terminal of the wireless transmission circuit 12. The timer chip 112 may include, but is not limited to, chips such as NE555. The timer chip 112 has multiple pins. The trigger pin TR and the threshold pin TH of the timer chip 112 are connected to the induction antenna 111. The reset pin R, the discharge pin DC, and the power supply pin VCC of the timer chip 112 are connected to the positive terminal of the first power supply 13. The ground pin GND of the timer chip 112 is connected to the negative terminal of the first power supply 13. The control voltage pin CV of the timer is connected to the ground pin GND through the capacitor C1. The output terminal of the magnetic field sensing circuit 11 includes the output pin O of the timer chip.

[0032] The magnetic field sensing circuit 11 can be implemented as a bistable trigger structure. The sensing antenna 111 is configured to sense the magnetic field of the main circuit. The timer chip 112 can be configured to generate a first trigger signal in response to the magnetic field of the main circuit and transmit it to the wireless transmitting circuit 12 through its output terminal. The trigger pin TR and the threshold pin TH are shorted and connected to the sensing antenna 111. After the sensing antenna 111 senses the magnetic field of the main circuit, a loop voltage is formed inside the timer chip 112, causing the output pin O to output the first trigger signal. Using the timer chip 112 to implement the magnetic field triggering function is not limited by the voltage of the first power supply 13. For example, the timer chip 112 can support operating voltages from 4.5V to 16V, allowing the magnetic field sensing circuit to share the first power supply 13 with other circuits. Furthermore, the magnetic field sensing circuit 11, including the timer chip 112, can detect a minimum voltage of 0.1V, which is more sensitive than the solution using a series transistor that can only detect a minimum voltage of 2V.

[0033] The wireless transmitting circuit 12 may include, but is not limited to, structures such as an oscillation unit, an amplification unit, and a modulation unit. The wireless transmitting circuit 12 can be implemented using, but is not limited to, devices such as resistors, capacitors, inductors, transistors, and crystal oscillators. For example, as... Figure 3As shown, the input of the wireless transmitting circuit 12 may include one end of resistor R1, the other end of which is connected to the control terminal of transistor T1. The first terminal of transistor T1 is grounded, and the second terminal of transistor T1 is connected to capacitor C2 and the first terminal of transistor T2. The control terminal of transistor T2 is connected to resistor R2 and crystal oscillator M, and the second terminal of transistor T2 is connected to capacitor C3 and inductor L1. Capacitor C2, resistor R2, crystal oscillator M, and inductor L2 are connected together, and capacitor C3 is connected to antenna 121. The input terminal of antenna 121 is equipped with a frequency selection circuit, which allows it to operate independently of a specific wavelength antenna. When the wireless transmitting distance of the wireless transmitting circuit 12 is relatively short, the length of antenna 121 can be shortened or even eliminated, making it easier to carry the portable voltage detector 10. The waveform of the wireless signal output by the wireless transmitting circuit 12 does not produce dense noise waveforms, resulting in stronger anti-interference capabilities. The wireless transmitting circuit 12 has a relatively wide operating voltage range, such as 3V to 12V. This ensures that the output frequency of the wireless transmitting circuit 12 remains essentially unchanged when the operating voltage varies. Correspondingly, the control cabinet control device 20 can stably receive the wireless signal output by the wireless transmitting circuit 12. When the transmitting voltage of the wireless transmitting circuit 12 reaches 3V, the transmitting power is relatively low, and the transmission distance of the wireless signal in an open area is approximately 20 to 50 meters. When the transmitting voltage of the wireless transmitting circuit 12 reaches 5V, the transmission distance of the wireless signal in an open area is approximately 100 to 200 meters, which can meet the needs of control cabinet protection scenarios. It should be noted that the specific structure of the wireless transmitting circuit 12 is not limited to the above, and other circuits capable of implementing wireless transmission functions are also within the protection scope of this application embodiment.

[0034] In some examples, the portable voltage detector 10 may also be equipped with a structure to indicate to the operator that the main circuit of the control cabinet is connected. Figure 4 This is a schematic diagram of the structure of a portable voltage detector provided in another embodiment of this application. Figure 4 and Figure 3 The difference is that, Figure 4 The portable voltage detector 10 shown may also include an alarm circuit 14.

[0035] Alarm circuit 14 is connected to the output terminal of magnetic field sensing circuit 11. Specifically, one end of alarm circuit 14 is connected to the output pin O of timer chip 112, and the other end of alarm circuit 14 is connected to the ground pin GND of timer chip 112. Alarm circuit 14 is configured to issue an alarm signal in response to a first trigger signal. Specifically, the alarm signal may include, but is not limited to, light signals, sound signals, etc. For example, such as... Figure 4As shown, the alarm circuit 14 may include an LED D1 and a buzzer BUZ. The LED D1 and resistor R3, connected in series, are connected in parallel with the buzzer BUZ between the output pin O of the timer chip 112 and the ground pin GND. The induction antenna 111 senses the magnetic field generated by the conducting main circuit, and the timer chip 112 generates a circuit voltage, which outputs a first trigger signal through the output pin O. The first trigger signal can trigger the wireless transmission circuit 12 to transmit a wireless signal, and can also drive the LED D1 to light up and drive the buzzer BUZ to sound. The lighting of the LED D1 and the sounding of the buzzer BUZ remind the user that the control cabinet is energized, providing a safety reminder to the operator and improving safety.

[0036] In some examples, the portable voltage detector 10 can be designed as a miniature device; for example, it can be implemented as a ring, bracelet, watch, or other device that is easy to wear on the operator's finger or wrist. Figure 5 This is a schematic diagram of an example of a portable voltage tester provided in an embodiment of this application. The portable voltage tester 10 is implemented as a ring, worn on the finger of the operator, and can move with the operator to the vicinity of the control cabinet 30, thereby sensing the magnetic field generated by the conducting main circuit and emitting a wireless signal.

[0037] In some embodiments, the control cabinet control device 20 may include a wireless receiving structure and a control structure. Figure 6 This is a schematic diagram of the architecture of a control cabinet protection system provided in another embodiment of this application, as shown below. Figure 6 As shown, the control cabinet control device 20 in the control cabinet protection system includes a wireless receiving circuit 21 and a control unit 22 electrically connected. The wireless receiving circuit is configured to send a second trigger signal to the control unit 22 in response to a received wireless signal. The second trigger signal may be an electrical signal, used to trigger the control unit 22 to control the switching unit 31. The control unit 22 is connected to the switching unit 31 and is configured to send a shutdown signal to the switching unit 31 in response to the second trigger signal. The control unit 22 may include a programmable logic controller (PLC).

[0038] In some examples, the control cabinet control device 20 may further include a second power supply 23, which supplies power to the wireless receiving circuit 21 and the control unit 22. The second power supply 23 may include a power-taking terminal and a power-supply terminal; the power-taking terminal is used to acquire electrical energy, and the power-supply terminal is used to output electrical energy. The power-taking terminal of the second power supply 23 is connected to the main circuit before the switching unit 31, and the power-supply terminal of the second power supply 23 is connected to the wireless receiving circuit 21 and the control unit 22. That is, the second power supply 23 draws power from the main circuit to supply power to the wireless receiving circuit 21 and the control unit 22. The main circuit generally uses higher voltage AC power, while the wireless receiving circuit 21 and control unit 22 generally require lower voltage DC power. The second power supply 23 can convert the high voltage AC power obtained from the main circuit into low voltage DC power to power the wireless receiving circuit 21 and control unit 22. For example, if the voltage of the AC power in the main circuit is 220V and the voltage of the DC power required by the wireless receiving circuit 21 and control unit 22 is 24V, then the second power supply 23 will convert the 220V AC power into 24V DC power. The second power supply 23 may include an AC-DC converter.

[0039] In some embodiments, the control cabinet protection system may also include a touch switch. Figure 7 A schematic diagram of the architecture of a control cabinet protection system provided in another embodiment of this application is shown below. Figure 7 As shown, the touch switch 32 can be installed in the control cabinet 30. Specifically, the touch switch 32 can be installed near a critical energized location within the control cabinet 30. The touch switch 32 is configured to send an off signal to the switch unit 31 in response to a user's touch operation, thereby disconnecting the main circuit. When the touch switch 32 is touched by an operator or other user, a human body sensing signal is applied to the touch switch 32, triggering it to release the off signal. This off signal causes the switch unit 31 to disconnect, thus disconnecting the main circuit. In some examples, the touch switch 32 can be connected to the switch unit 31, either wired or wirelessly, allowing the touch switch 32 to directly send an off signal to the switch unit 31. In other examples, the touch switch 32 can be connected to the control cabinet control device 20. When the touch switch 32 is touched by a user, it triggers the touch switch 32 to send a trigger signal to the control cabinet control device 20, which then sends an off signal to the switch unit 31.

[0040] The touch switch 32 and the portable voltage tester 10 provide dual protection for the maintenance and use of the control cabinet 30 by operators and other users. If one of the touch switch 32 and the portable voltage tester 10 fails, the other can trigger the switch unit 31 to disconnect, thereby further improving the safety of the maintenance and use of the control cabinet 30 by operators.

[0041] The second aspect of this application provides a portable voltage testing device for use in the control cabinet of a wind turbine. For example... Figures 2 to 4 As shown, the portable voltage detector 10 includes a magnetic field sensing circuit 11 and a wireless transmission circuit 12. The magnetic field sensing circuit 11 can be configured to sense the magnetic field of the main circuit of the control cabinet and generate a first trigger signal. The input terminal of the wireless transmission circuit 12 is connected to the output terminal of the magnetic field sensing circuit 11. The wireless transmission circuit 12 is configured to transmit a wireless signal in response to the first trigger signal transmitted from the magnetic field sensing circuit 11, so that the wireless signal can be received by the control cabinet control device 20. The control cabinet control device 20 is used to control the switching unit 31 of the main circuit located in the control cabinet 30.

[0042] The specific details of the portable voltage testing device 10 can be found in the relevant content of the above embodiments, and it can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0043] The third aspect of this application provides a wind turbine generator set, which may include the control cabinet 30 and the control cabinet protection system in the above embodiments. For details, please refer to the relevant content in the above embodiments, and it can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0044] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. This application is not limited to the specific structures described above and shown in the figures. Those skilled in the art can make various changes, modifications, and additions after understanding the spirit of this application. Furthermore, for the sake of brevity, detailed descriptions of known structural technologies are omitted here.

[0045] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other structures; the quantifier "a" does not exclude a plurality; the terms "first" and "second" are used to identify names rather than to indicate any specific order. Any reference numerals in the claims should not be construed as limiting the scope of protection. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A control cabinet protection system, characterized in that, include: A portable voltage detector includes a magnetic field sensing circuit and a wireless transmission circuit. The output terminal of the magnetic field sensing circuit is connected to the input terminal of the wireless transmission circuit. The magnetic field sensing circuit is configured to sense the magnetic field of the main circuit of the control cabinet and transmit a first trigger signal to the wireless transmission circuit. The wireless transmission circuit is configured to transmit a wireless signal in response to the first trigger signal. The control cabinet control device is wirelessly connected to the portable voltage detector and to the switch unit located in the main circuit. It is configured to send a shutdown signal to the switch unit in response to the received wireless signal, so as to disconnect the main circuit.

2. The control cabinet protection system according to claim 1, characterized in that, The magnetic field sensing circuit includes: An inductive antenna is configured to sense the magnetic field of the main circuit; A timer chip, connected to the inductive antenna and the input terminal of the wireless transmission circuit, is configured to generate a first trigger signal in response to the magnetic field of the main circuit and transmit it to the wireless transmission circuit through its output terminal.

3. The control cabinet protection system according to claim 2, characterized in that, The portable voltage testing device also includes a first power source; The trigger pin and threshold pin of the timer chip are connected to the induction antenna. The reset pin, discharge pin and power pin of the timer chip are connected to the positive terminal of the first power supply. The ground pin of the timer chip is connected to the negative terminal of the first power supply. The control voltage pin of the timer is connected to the ground pin through a capacitor. The output terminal of the magnetic field induction circuit includes the output pin of the timer chip.

4. The control cabinet protection system according to claim 1, characterized in that, The portable voltage detector also includes an alarm circuit connected to the output terminal of the magnetic field induction circuit, the alarm circuit being configured to issue an alarm signal in response to the first trigger signal.

5. The control cabinet protection system according to claim 4, characterized in that, The magnetic field sensing circuit includes a timer chip; One end of the alarm circuit is connected to the output pin of the timer chip, and the other end of the alarm circuit is connected to the ground pin of the timer chip.

6. The control cabinet protection system according to claim 1, characterized in that, The control cabinet control device includes an electrically connected wireless receiving circuit and a control unit; The wireless receiving circuit is configured to send a second trigger signal to the control unit in response to the received wireless signal; The control unit is connected to the switching unit and is configured to send the shutdown signal to the switching unit in response to the second trigger signal.

7. The control cabinet protection system according to claim 6, characterized in that, The control cabinet control device also includes a second power supply. The power take-off terminal of the second power supply is connected to the main circuit before the switching unit, and the power supply terminal of the second power supply is connected to the wireless receiving circuit and the control unit.

8. The control cabinet protection system according to claim 1, characterized in that, Also includes: The touch switch installed in the control cabinet is configured to send an off signal to the switch unit in response to a user's touch operation, thereby disconnecting the main circuit.

9. A portable voltage detector, characterized in that, The portable voltage testing device, used in the control cabinet of a wind turbine generator, includes: A magnetic field sensing circuit is configured to sense the magnetic field of the main circuit of the control cabinet and generate a first trigger signal. A wireless transmitting circuit, the input of which is connected to the output of the magnetic field sensing circuit, is configured to transmit a wireless signal in response to the first trigger signal transmitted from the magnetic field sensing circuit, so that the wireless signal is received by the control cabinet control device, which is used to control the switching unit located in the main circuit of the control cabinet.

10. A wind turbine generator set, characterized in that, include: Control cabinet; The control cabinet protection system as described in any one of claims 1 to 8.

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