Intelligent fan protection device for heavy-duty locomotive

Abstract

The utility model discloses an intelligent fan protection device for a heavy locomotive, which comprises a protection device, and the protection device comprises a fuse, a zero sequence mutual inductor, a vacuum contactor, a current and frequency sensor, a voltage transformer, a control coil, an electric leakage signal processing circuit and a voltage signal processing circuit. Furthermore, a vacuum contactor is adopted as the on-off control of the main loop, and the vacuum contactor has high on-off capability, is quick in response, adapts to high frequency and high voltage, and is free of arc pollution; the electronic master control device adopts a modular design, is dustproof, waterproof and drop-resistant, can be reliably applied to various severe environments, and is not interfered and influenced by other equipment; the system has the functions of intelligent automatic inspection, dynamic frequency tracking of running current, fault judgment, fault hidden danger prediction, fault reason analysis, fault information display, fault information recording and the like. And meanwhile, a panel is provided for direct control, and a network communication function is provided for transmitting information to a driving control room and background monitoring equipment, so that network control integration is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of heavy locomotive equipment, specifically to an intelligent fan protection device for heavy locomotives. Background Technology

[0002] Heavy locomotives use internal combustion engines as their primary power source. Due to the numerous auxiliary electrical components and high power consumption, these locomotives rely on generators driven by the engine to convert electricity into power. The high power output and heat generated during operation of heavy locomotives depend entirely on auxiliary fans for cooling. Since the cooling fans are directly powered by the generator, and the locomotive engine operates at different speeds, the voltage, current, and frequency of the generator output also vary accordingly. Similarly, the current, voltage, and frequency of the fan motor also change. Currently, ordinary protection devices cannot automatically monitor and detect potential faults in the fan, such as overcurrent, dynamic imbalance, phase loss, and leakage. Existing fault protection devices for cooling fans can only use fuses for short circuits in the main circuit, and overload protection relies on ordinary temperature sensors to provide overheating signals to the control room for alarm prompts. This temperature-based alarm system only outputs an overheating alarm when the fan temperature reaches its limit and is greatly affected by the ambient temperature. Using such simplistic protection devices and alarm methods, lacking comprehensive protection, leads to frequent burnout of the fan drive motor.

[0003] However, traditional protection devices have the following drawbacks:

[0004] (1) Using fuse protection can easily cause single-phase melting, which will result in the fan motor operating with a single phase and the fan motor coil burning out;

[0005] (2) Lack of fault hazard monitoring and dynamic tracking of operating current, unable to monitor the fan operating status and fault trip protection in real time;

[0006] (3) It lacks the function of tracking and detecting operating frequency, and cannot automatically track and calculate the identification of normal operating current and fault overcurrent;

[0007] (4) The main circuit lacks leakage detection and protection functions, which can easily cause leakage hazards;

[0008] (5) The lack of imbalance monitoring function causes the fan to continue to operate when it is unbalanced, resulting in severe vibration and damage to the bearings or blades;

[0009] (6) Lack of fault information storage and remote fault push function, resulting in the inability to find the cause of the fault and difficulty in maintenance. Utility Model Content

[0010] In view of the deficiencies of the prior art, the purpose of this utility model is to provide an intelligent fan protection device for heavy locomotives.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0012] The system employs vacuum contactors to control the on / off state of the main circuit and fuses to protect against short circuits. The system control circuit uses a zero-sequence current transformer to collect the main circuit leakage current signal, a voltage transformer to collect the main circuit supply voltage signal, a current frequency sensor to collect the main circuit sine wave frequency signal, and a three-phase integrated current sensor to collect the main circuit three-phase operating current signal. These signals are connected to a leakage signal comparison and amplification circuit, a voltage signal processing circuit, a frequency signal detection and amplification circuit, and a three-phase current signal processing circuit, respectively. After effective signal processing, the signals are transmitted to the main control system circuit for system program analysis, calculation, and judgment. The main control system circuit then issues commands to the information display interface to show the operating status. When faults such as short circuits, grounding leakage, single-phase start-up, single-phase operation, overload, phase imbalance, overvoltage, or undervoltage occur in the main circuit, the main control system circuit issues commands to trigger the control circuit relays, causing the vacuum contactors in the main circuit to disconnect and reliably protect the fan motor. Simultaneously, the main control system issues commands to drive the fault alarm circuit to output an alarm and sends the fan operating data to the operator's cab and the background monitoring equipment via a communication circuit, achieving integrated information processing.

[0013] A heavy-duty locomotive intelligent fan protection device includes a protection unit comprising fuses, a zero-sequence current transformer, a vacuum contactor, a current-frequency sensor, a voltage transformer, a vacuum contactor control coil, a leakage current signal comparison and amplification processing circuit, a voltage signal processing circuit, a contactor secondary circuit control circuit, a frequency signal detection and amplification circuit, a three-phase current signal processing circuit, a communication circuit transceiver module circuit, a power supply processing module circuit, an alarm output circuit, a local area network transceiver module circuit, a main control chip system circuit, an information display interface, a fault cause indicator, a parameter setting button circuit, and a fan drive motor. Phases A / B / C of the three-phase main circuit are respectively connected to three fuses, which are then connected to the input terminals L1 / L2 / L3 of the vacuum contactor, and the output terminals T1 / T2 / T3 of the vacuum contactor are connected to the U / V / W terminals of the fan motor, respectively.

[0014] The main control system circuits are all connected to the leakage current signal processing circuit, voltage signal processing circuit, contactor secondary circuit control circuit, frequency signal detection and amplification circuit, three-phase current signal processing circuit, power supply module circuit, fault alarm output circuit, communication module circuit, fault indication circuit, information display interface, and parameter setting button circuit. The leakage current signal processing circuit is connected to the secondary terminal of the zero-sequence current transformer, the voltage signal processing circuit is connected to the secondary terminal of the voltage transformer, the contactor secondary circuit control circuit is connected to the vacuum contactor control coil, and both the frequency signal detection and amplification circuit and the three-phase current signal processing circuit are connected to the current frequency sensor.

[0015] Preferably, the leakage current signal processing circuit includes resistors R131 and R132 and an operational amplifier LM358. Pin 3 of the LM358 (positive input) is connected to one end of resistor R131, pin 2 (inverting input) is grounded, and pin 1 (output) is connected to one end of resistor R132. In this leakage current signal processing circuit, when the vector sum of the currents passing through the zero-sequence transformer in the three-phase main circuit is no longer zero, a current signal is generated on the secondary side of the zero-sequence transformer. The leakage current signal, after being current-limited by resistor R131, is transmitted to the positive input pin 3 of the LM358 for operational amplification. The amplified signal is then passed through... The current is limited by resistor R132 after being transmitted from pin 1 of the LM358 op-amp output, and then transmitted to pin 9 (VOT-AD port) of the main control chip U20. After the main control chip system program analyzes and calculates to confirm the leakage fault, pin 22 of the main control chip sends a command to trigger RY1 to control the relay to cut off the secondary coil circuit of the vacuum contactor, so that the vacuum contactor loses power and disconnects the main circuit power supply, ensuring the safety of equipment and personnel. At the same time, pin 21 of the main control chip sends a command to trigger RY2 alarm relay to close and connect the alarm device. Simultaneously, the main control chip sends data to the display screen to display the leakage information through pin 19 (RXD port) and pin 20 (TXD port).

[0016] Preferably, the voltage signal processing circuit includes a rectifier bridge D20, resistors R163 and R161, an electrolytic capacitor C81, and a fine-tuning potentiometer RW4. The voltage signal acquired through the secondary terminal of the voltage transformer is input to the rectifier bridge D20, rectified, filtered by resistor R163 and capacitor C81, current-limited by resistor R163, and then divided by the fine-tuning potentiometer RW4 before being transmitted to the VOT-AD port of pin 9 of the main control chip U20. After being transmitted to the main control chip system for overvoltage and undervoltage analysis and calculation, the main control system chip transmits the data to the display screen to display the voltage value information through the RXD port of pin 19 and the TXD port of pin 20.

[0017] Preferably, the contactor secondary circuit control circuit includes: diode D22, miniature relay RLY3, resistor R168, and transistor Q6. Pin 3 of the transistor is connected to one end of miniature relay RLY3 / diode D22, pin 2 of transistor Q6 is connected to one end of resistor R168, and pin 1 of transistor Q6 is grounded. When the main control system chip U20 collects a fault signal, the system program analyzes and confirms the fault, and then sends a command through pin 22#RY1 to trigger the control circuit 9 to drive miniature relay RLY3 to disconnect the vacuum contactor secondary circuit, cut off the main circuit power supply, and protect the fan drive motor.

[0018] Preferably, the frequency signal detection and amplification circuit includes: an operational amplifier LM358, resistors R153 / R154, pin 5 of the LM358's positive input terminal connected to one end of resistor R153, pin 7 of the LM358's output terminal connected to one end of resistor R154, and pin 6 of the LM358 grounded. When the current frequency sensor CTB acquires the sinusoidal frequency signal of the main circuit, it is transmitted to the signal amplification circuit. R153 is used for current limiting, and the signal is then connected to pin 5 of the LM358's positive input terminal. The signal is then amplified by the LM358 and output through pin 7 of the LM358. After being connected to resistor R154 for current limiting, the signal data is transmitted to the FREQ port of pin 11 of the main control chip U20. The data is then transmitted to the main control chip system program for logic calculation. After that, the data is sent to the display screen through the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip to display the frequency information. At the same time, the system program automatically calculates the operating current value of the fan by collecting the frequency signal and tracks and judges the normal operating current value and overcurrent fault value of the fan. The system program also analyzes and judges whether there is an overcurrent fault, thus realizing the function of automatically tracking and calculating the normal operating current and fault overcurrent.

[0019] Preferably, the three-phase current signal processing circuit includes: the A-phase current signal processing circuit includes diode D17, resistors R130 and R133, electrolytic capacitor C70, and fine-tuning potentiometer RW1; the B-phase current signal processing circuit includes diode D18, resistors R144 and R147, electrolytic capacitor C75, and fine-tuning potentiometer RW2; and the C-phase current signal processing circuit includes diode D19, resistors R156 and R157, electrolytic capacitor C78, ​​and fine-tuning potentiometer RW3. The three-phase current signal processing circuit uses a three-phase integrated current detection sensor developed based on the principle of electromagnetic induction to collect the A / B / C phase current signals of the main circuit. The current signal collected by the A-phase sensor is connected to diode D17 for half-wave rectification, then connected to resistor R133 for voltage division and filtered by electrolytic capacitor C70. After being connected to current-limiting resistor R130 and fine-tuning potentiometer RW1 for voltage division, it is transmitted to pin 6 (A-AD port) of the U20 main control chip. After current analysis and calculation by the main control system, the data is sent through pin 19 (RXD port) and pin 20 (TXD port) of the main control system chip. The current signal from the phase B sensor is fed to the display screen, which shows the phase A current value and operating status information. The current signal from the phase B sensor is rectified by diode D18, then connected to resistor R147 for voltage division and filtered by electrolytic capacitor C75. After being connected to current-limiting resistor R144 and fine-tuning potentiometer RW2 for voltage division, the signal is transmitted to pin 7 (B-AD port) of the U20 main control chip. The main control system performs current analysis and calculation, and then sends the data to the display screen via pin 19 (RXD port) and pin 20 (TXD port) of the main control system chip. The display screen shows the phase B current value and operating status information. The current signal from the phase C sensor is also collected. The current signal is rectified by diode D19, then connected to resistor R133 for voltage division and filtered by electrolytic capacitor C70, then connected to current-limiting resistor R156 and fine-tuning potentiometer RW3 for voltage division, and finally transmitted to pin 8 (C-AD port) of the U20 main control chip. After current analysis and calculation by the main control system, the data is sent to the display screen through pin 19 (RXD port) and pin 20 (TXD port) of the main control system chip. The display screen shows the C-phase current value and operating status information. When the three-phase current values ​​of the main circuit A / B / C exceed the preset range, pin 26 (LD2) of the main control system chip... The port sends a command to illuminate the LED LD6 in the fault cause indicator circuit 18 to indicate the overcurrent fault information. At the same time, the RY1 port of pin 22 of the main control system chip triggers the control circuit 9 to drive the miniature relay RLY3 to disconnect the secondary circuit of the vacuum contactor, cut off the main circuit power supply, and protect the fan from overcurrent faults. Simultaneously, the RY2 alarm relay of pin 21 of the main control system chip is triggered to close and connect the alarm device to output an alarm prompt. At the same time, the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip send data to the display screen, and the display screen displays the overcurrent fault information.When the current sensor detects that one or two phases of the three-phase circuit A / B / C in the main circuit have no current signal, the LD3 port of pin 27 of the main control system chip sends a command to light up the LED LD7 in the fault cause indicator circuit 18 to indicate the phase loss fault information. At the same time, the RY1 port of pin 22 of the main control system chip triggers the control circuit 9 to drive the miniature relay RLY3 to disconnect the secondary circuit of the vacuum contactor, cut off the main circuit power supply, and protect the fan from phase loss operation fault. At the same time, the RY2 alarm relay of pin 21 of the main control system chip is triggered to close and connect the alarm device to output an alarm prompt. Simultaneously, the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip send data to the display screen, and the display screen displays the phase loss fault information. When the current sensor detects that the three-phase current imbalance of the main circuit A / B / C is greater than 50%, the LD4 port of pin 8 of the main control system chip sends a command to light up the LED LD8 in the fault cause indicator circuit 18 to indicate the three-phase imbalance fault information. At the same time, the RY1 port of pin 22 of the main control system chip triggers the control circuit 9 to drive the miniature relay RLY3 to disconnect the secondary circuit of the vacuum contactor, cut off the main circuit power supply, and protect against the unbalanced operation fault of the fan. At the same time, the RY2 alarm relay of pin 21 of the main control system chip is triggered to close and connect the alarm device to output an alarm prompt. Simultaneously, the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip send data to the display screen, and the display screen displays the three-phase imbalance fault information, realizing the protection functions of the protection device such as overcurrent, phase loss, and three-phase imbalance.

[0020] Preferably, the communication transceiver module circuit includes: a U19 communication chip SSP3058, resistors R158, R159, R160 and R162, transistor Q5, ceramic capacitor C79, pin 1 of the communication chip U19 connected to one end of R158, pins 2 / 3 of U19 connected to resistor R160 and one end of pin 3 of transistor Q5, the power supply of pin 8 of U19 connected to one end of C79, pin 7 of U19 connected to one end of resistor R159, pin 6 of U19 connected to one end of resistor R162, pin 2 of transistor Q5 connected to one end of resistor R164, and pins 4 / 5 of U19 and pin 1 of transistor Q5 both grounded, forming the communication module circuit. The main control system transmits data to the display screen to show all the fan operation information via communication. The main control chip's pins A7-UART4-TXD and A7-UART4-RXD are connected to the A / B interface of the RS485 communication module circuit. The RS485 communication module circuit is composed of the communication SSP3085 transceiver chip, R158 / R159 / R160 / R162 / R164 / C79, and transistor Q5. Through the information transmission and reception of the RS485 communication module circuit, the control and display information are interconnected.

[0021] Preferably, the power processing module circuit includes: a switching power supply chip MP3302DJ, R116, R115, R116, C50, U10, C46, ​​L6, C47, and C48. Pin 1 of U10 is connected to one end of C47 and one end of C48, pin 2 of U10 is connected to the other end of C47 and the other end of C48, pin 3 of U10 is connected to one end of C46, ​​and the other end of C46 is grounded. Pin 3 of MP3302DJ is connected to one end of R116, pin 1 of MP3302DJ is connected to one end of L6 and one end of C50, pin 5 of MP3302DJ is connected to one end of C49, and pin 4 of MP3302DJ is connected to one end of R115. The other end of R115 is connected to one end of R114. The power processing module circuit uses an MP3302DJ switching power supply chip and R113 / R114 / R115R116C49 / C50 diodes D12 and inductor L6 to form a constant current source power supply. Then, an SSP1117-3.3V voltage regulator chip and C46 / C47 / C48 form a voltage regulator power supply to provide power to the main control chip. Then, a switching power supply chip TPS61040, R125 diodes D13 / D14 / D15, two BAT54S dual diodes, C56 / C57 / C58 / C59 / C60 / C61 / C62 / C63 / C67 / C68 inductor L8, etc. form a boost module to provide power to drive the display screen.

[0022] Preferably, the alarm output control circuit includes: diode D23, miniature relay RLY4, transistor Q7, and resistor R172. Pin 3 of Q7 is connected to the positive terminal of diode D23 and one end of relay RLY4. The other end of RLY4 is connected to the negative terminal of D23 and connected to the power supply. Pin 2 of Q7 is connected to one end of R172, and pin 1 of Q7 is grounded. When the fan malfunctions, the alarm output circuit sends an alarm command through the RY2 port of pin 21 of the U20 main control chip, which connects to the current limiting R172 to drive transistor Q7 to conduct, energizes the miniature relay RLY4, closes, and activates the fault alarm, thus realizing the fault alarm indication function.

[0023] Preferably, the regional network transceiver module circuit includes: a U21 communication chip TJA1050, inductors FB1 and FB2. Pin 7 of U21 is connected to one end of FB1, and pin 6 of U21 is connected to one end of FB2. The regional network transceiver module circuit uses regional network communication and can send wind turbine operation data to the management center's backend equipment to display wind turbine operation parameters and real-time status. The regional network transceiver module circuit is composed of the information communication transceiver chip TJA1050 of the protection device, R170 / C82, three SMAJ6.0CA bidirectional transient TVS diodes, two surface mount inductors FB1 / FB2, and an Ethernet chip LAN8720. Data is sent through the network transceiver module, realizing the information network interconnection function of the entire region.

[0024] Preferably, the main control system circuit includes a U20 main control chip MM32SPIN27PT, ceramic capacitors C83, C84, C85, C86, resistors R173, R175, and a running indicator light SYS2, which together form the main control system circuit.

[0025] The fault indication indicator includes current-limiting resistors R166, R167, R171, R174, and light-emitting diodes LED5, LED6, LED7, and LED8. One end of R166 is connected to one end of LED5, and the other end of LED5 is connected to pin 25 (LD1) of the main control chip U20. One end of R167 is connected to one end of LED6, and the other end of LED6 is connected to pin 26 (LD2) of the main control chip U20. One end of R171 is connected to one end of LED7, and the other end of LED7 is connected to pin 27 (LD3) of the main control chip U20. One end of R174 is connected to one end of LED8, and the other end of LED8 is connected to pin 28 (LD4) of the main control chip U20. This completes the fault indication circuit.

[0026] The parameter setting button circuit includes tactile switches SW1, SW2, SW3 and SW4, which are connected to the main control chip U20's pins 12 (KEY1), 13 (KEY2), 14 (KEY3), and 15 (KEY4) to form the parameter setting button circuit.

[0027] The main control system chip circuit U20 uses MM32SPIN27PT as the main control system chip and auxiliary components, R169 / R173 / R175, C83 / C84 / C85 / C86, LED SYS2, system program writing port SWD2, etc. to form the main control system circuit. Through zero-sequence transformers, voltage transformers, current signal acquisition sensors, and frequency signal acquisition sensors, the acquired signals are rectified, amplified, and processed by the main control chip. The system program then analyzes, calculates, and judges various signals, and transmits the data to the display screen and backend display device via the communication module, realizing a complete intelligent fan protection device. The display screen shows all the fan's operating data, sent from the main control system. For fault indication, when the main control system detects and confirms a power leakage fault, it sends a command through the LD1 port of pin 25 of the main control chip to light up LED LD5 to indicate the leakage fault. When the main control system detects and confirms an overload or overcurrent fault, it sends a command through the LD1 port of pin 26 of the main control chip to light up LED LD5 to indicate the leakage fault. The LD2 port of the pin sends a command to light up LED LD6 to indicate an overcurrent fault. When the main control system detects and confirms a phase loss fault, it sends a command through the LD3 port of the main control chip pin 27 to light up LED LD7 to indicate a phase loss fault. When the main control system detects and confirms a three-phase imbalance fault, it sends a command through the LD4 port of the main control chip pin 28 to light up LED LD8 to indicate a three-phase imbalance fault. The parameter setting button circuit uses a 12*12*10H waterproof tactile switch as the parameter setting button. SW1 is connected to the KEY1 pin of the U20 main control chip as the system menu setting selection key, SW2 is connected to the KEY2 pin of the U20 main control chip as the setting parameter increment key, SW3 is connected to the KEY3 pin of the U20 main control chip as the setting parameter decrement key, and SW4 is connected to the KEY4 pin of the U20 main control chip as the fault reset key, etc., which constitute the parameter button setting circuit.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] 1. Using vacuum contactors as the main circuit control, it has high switching capacity, high reliability, fast response, adaptability to high frequency and high voltage, and no arc pollution;

[0030] 2. The main electronic control components adopt a modular design, are dustproof, waterproof, and drop-proof, and can reliably adapt to various harsh environments without being affected by interference from other devices.

[0031] 3. It has functions such as automatic inspection, fault tracking, fault prediction, fault cause analysis and fault information recording;

[0032] 4. It features direct control via a control panel and network communication capabilities to transmit information to the driver's control room and back-end monitoring equipment, achieving network integration;

[0033] 5. It has leakage current detection and protection functions to ensure operational and personal safety;

[0034] 6. Employs high-precision sensors and electromagnetic induction technology to detect current, frequency, and leakage signals in real time, ensuring safety and reliability;

[0035] 7. It adopts Chinese display function to display the fan operating parameters and fault cause information in real time, which reduces the workload of fault diagnosis and disassembly and greatly improves maintenance efficiency;

[0036] 8. This utility model has an automatic failure exit function, which ensures the effective and reliable operation of the device;

[0037] 9. This utility model uses a constant current source for power supply, which ensures the electrical safety of the device while avoiding external interference;

[0038] 10. This utility model adopts a recessed design, which makes installation convenient and quick, while avoiding external impact. Attached Figure Description

[0039] Figure 1 This is a structural diagram of the protective device of this utility model;

[0040] Figure 2 This is a circuit diagram of the leakage current signal processing circuit of this utility model;

[0041] Figure 3 This is a circuit diagram of the voltage signal processing module of this utility model;

[0042] Figure 4 This is a circuit diagram of the contactor secondary circuit control circuit of this utility model;

[0043] Figure 5 This is a circuit diagram of the frequency signal detection and amplification circuit of this utility model;

[0044] Figure 6 This is a circuit diagram of the three-phase current signal processing circuit of this utility model;

[0045] Figure 7 This is a circuit diagram of the communication transceiver circuit of this utility model;

[0046] Figure 8 This is a circuit diagram of the power processing module circuit of this utility model;

[0047] Figure 9 This is a circuit diagram of the alarm output circuit of this utility model;

[0048] Figure 10 This is a circuit diagram of the local area network transceiver module of this utility model;

[0049] Figure 11The circuit diagram of the main control chip circuit of this utility model is shown below.

[0050] Figure 12 This is a circuit diagram of the fault indication symbol of this utility model;

[0051] Figure 13 The circuit diagram of the parameter setting button circuit of this utility model.

[0052] In the diagram: 1. Fuse; 2. Zero-sequence current transformer; 3. Vacuum contactor; 4. Current frequency sensor; 5. Voltage transformer; 6. Control coil; 7. Leakage signal processing circuit; 8. Voltage signal processing circuit; 9. Contactor secondary circuit control circuit; 10. Frequency signal detection and amplification circuit; 11. Three-phase current signal processing circuit; 12. Communication circuit transceiver module circuit; 13. Power supply processing module circuit; 14. Alarm output circuit; 15. Local area network transceiver module circuit; 16. Main control chip system circuit; 17. Information display interface; 18. Fault cause indicator; 19. Parameter setting button circuit; 20. Fan drive motor. Detailed Implementation

[0053] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0054] Please see Figure 1-13This utility model provides an intelligent fan protection device for heavy locomotives, including a protection device comprising a fuse 1, a zero-sequence transformer 2, a vacuum contactor 3, a current frequency sensor 4, a voltage transformer 5, a control coil 6, a leakage current signal processing circuit 7, a voltage signal processing circuit 8, a contactor secondary circuit control circuit 9, a frequency signal detection and amplification circuit 10, a three-phase current signal processing circuit 11, a communication circuit transceiver module circuit 12, a power processing module circuit 13, an alarm output circuit 14, a local area network transceiver module circuit 15, a main control system circuit 16, an information display interface 17, a fault cause indicator 18, a parameter setting button circuit 19, and a fan drive motor 20. The three-phase main circuit power supply A / B / C is respectively connected to the fuse 1, passes through the zero-sequence transformer 2 through the fuse terminals, and is connected to the input terminals L1 / L2 / L3 of the vacuum contactor 3. Then, it passes through the output terminals T1 / T2 / T3 of the vacuum contactor, passes through the current frequency sensor 4, and is connected to the terminals U / V / W of the fan drive motor 20, forming a complete main circuit circuit. The main control system circuit 16 is connected to the leakage current signal processing circuit 7, voltage signal processing circuit 8, contactor secondary circuit control circuit 9, frequency signal detection and amplification circuit 10, three-phase current signal processing circuit 11, communication circuit transceiver module circuit 12, power processing module circuit 13, alarm output circuit 14, local area network transceiver module circuit 15, information display interface 17, fault cause indicator 18, and parameter setting button circuit 19. The P1 / P2 terminals of the leakage current signal processing circuit 7 are connected to the secondary terminals of the zero-sequence transformer 2. The V1 / V2 terminals of the voltage signal processing circuit 8 are connected to the secondary terminals of the voltage transformer 5. The primary side of the voltage transformer 5 is connected to L2 / L3 of the main circuit. The K1 / K2 terminals of the contactor secondary circuit control circuit 9 are connected to the A1 / A2 terminals of the contactor control coil 6. The H1 / H2 terminals of the frequency signal detection and amplification circuit 10 are connected to the CTB / COM terminals of the current frequency sensor. The CT1 / CT2 / CT3 / COM terminals of the three-phase current signal processing circuit 11 are all connected to the CTA / CTB / CTC / COM terminals of the current sensor 4.

[0055] The leakage current signal processing circuit 7 includes resistors R131 and R132 and an operational amplifier LM358-A1. Pin 3 (positive input) of the LM358 is connected to one end of resistor R131, pin 2 (inverting input) of the LM358 is grounded, and pin 1 (output) of the LM358 is connected to one end of resistor R132. When the vector sum of the currents passing through the zero-sequence transformer in the three-phase main circuit is no longer zero, a zero-sequence current signal is generated on the secondary side of the zero-sequence transformer. After current limiting by resistor R131, the zero-sequence current signal is transmitted to pin 3 (positive input) of the LM358 for operational comparison and amplification. After amplification, the signal is transmitted to pin 1 (output) of the LM358 and then to resistor R132 for current limiting. Then, the data is transmitted to the VOT-AD port of pin 9 of the main control chip U20. After the main control chip system program analyzes and calculates to confirm the leakage fault, pin 22 of the main control chip sends a command to trigger RY1 to control the relay to cut off the secondary coil circuit of the vacuum contactor, so that the vacuum contactor loses power and disconnects the main circuit power supply, ensuring the safety of equipment and personnel. At the same time, pin 21 of the main control chip sends a command to trigger RY2 alarm relay to close and connect the alarm device to output an alarm prompt. At the same time, pin 25 of the main control chip sends a command to light up the LED LD5 in the fault cause indicator circuit 18 to indicate the leakage fault information. At the same time, the main control chip sends data to the display screen to display the leakage information through pin 19 RXD port and pin 20 TXD port.

[0056] The voltage signal processing circuit 8 includes: a rectifier bridge D20, resistors R163 and R161, an electrolytic capacitor C81, and a fine-tuning potentiometer RW4. The voltage signal acquired through the secondary terminal of the voltage transformer 5 is input to the rectifier bridge D20. After rectification, the signal is divided by resistor R163, filtered by capacitor C81, and then current-limited by resistor R163 and divided again by the fine-tuning potentiometer RW4 before being connected to the VOT-AD port (pin 9) of the main control chip U20. The signal is transmitted to the main control chip system for overvoltage and undervoltage analysis and calculation. When the main circuit voltage parameter exceeds the preset range, pin 22 of the main control chip sends a command to trigger RY1 to control the relay to cut off the secondary coil circuit of the vacuum contactor, causing the vacuum contactor to lose power and disconnect the main circuit power supply, thus protecting the electrical safety of the equipment. At the same time, pin 21 of the main control chip sends a command to trigger the alarm relay RY2 to close and connect the alarm device to output an alarm prompt. Simultaneously, pin 19 (RXD port) and pin 20 (TXD port) of the main control chip send data to the display screen to display the voltage value information.

[0057] The contactor secondary circuit control circuit 9 includes: diode D22, miniature relay RLY3, resistor R168, and transistor Q6. Pin 3 of the transistor is connected to one end of miniature relay RLY3 / diode D22, pin 2 of transistor Q6 is connected to one end of resistor R168, and pin 1 of transistor Q6 is grounded. When the main control system chip U20 collects a fault signal, the system program analyzes and confirms the fault, and then sends a command through pin 22#RY1 to trigger the control circuit 9 to drive miniature relay RLY3 to disconnect the vacuum contactor secondary circuit, cut off the main circuit power supply, and protect the fan drive motor.

[0058] The frequency signal detection and amplification circuit 10 includes: an operational amplifier LM358, resistors R153 / R154. Pin 5 of the LM358's positive input is connected to one end of resistor R153, pin 7 of the LM358's output is connected to one end of resistor R154, and pin 6 of the LM358 is grounded. When the current frequency sensor CTB acquires a sinusoidal frequency signal from the main circuit, it is transmitted to the signal amplification circuit. R153 limits the current, which is then connected to pin 5 of the LM358's positive input. The signal is then amplified by the LM358 and finally connected to the signal amplification circuit via pin 7 of the LM358's output. After current limiting by resistor R154, the signal data is transmitted to the FREQ port of pin 11 of the main control chip U20. The data is then transmitted to the main control chip system program for logic calculation. After that, the data is sent to the display screen through the RXD port of pin 19 and the TXD port of pin 20 of the main control chip to display the frequency information. At the same time, the system program automatically calculates the operating current value of the fan by collecting the frequency signal and tracks and judges the normal operating current value and overcurrent fault value of the fan. The system program also analyzes and judges whether there is an overcurrent fault, thus realizing the function of automatically tracking and calculating the normal operating current and fault overcurrent.

[0059] The three-phase current signal processing circuit 11 includes: its A-phase current signal processing circuit includes diode D17, resistors R130 and R133, electrolytic capacitor C70, and fine-tuning potentiometer RW1; its B-phase current signal processing circuit includes diode D18, resistors R144 and R147, electrolytic capacitor C75, and fine-tuning potentiometer RW2; and its C-phase current signal processing circuit includes diode D19, resistors R156 and R157, electrolytic capacitor C78, ​​and fine-tuning potentiometer RW3. The three-phase current signal processing circuit utilizes a three-phase integrated current detection sensor developed based on the principle of electromagnetic induction. The three-phase current signals of the main circuit (A / B / C) are collected separately. The current signal collected by the A-phase sensor is half-wave rectified by diode D17, then connected to resistor R133 for voltage division and filtered by electrolytic capacitor C70. After being connected to current-limiting resistor R130 and fine-tuning potentiometer RW1 for voltage division, it is transmitted to pin 6 (A-AD port) of the U20 main control chip. After current analysis and calculation by the main control system, the data is sent to the display screen through pin 19 (RXD port) and pin 20 (TXD port) of the main control system chip. The display screen shows the A-phase current value and operating status information. The current signal collected by the B-phase sensor is half-wave rectified by diode D18, then connected to resistor R147 for voltage division and filtered by electrolytic capacitor C75. After being connected to current-limiting resistor R144 and fine-tuning potentiometer RW1, it is transmitted to the U20 main control chip. After voltage division, the current is transmitted to pin 7 (B-AD port) of the U20 main control chip. After current analysis and calculation by the main control system, the data is sent to the display screen through pin 19 (RXD port) and pin 20 (TXD port) of the main control system chip. The display screen shows the B-phase current value and operating status information. The current signal collected by the C-phase sensor is connected to diode D19 for half-wave rectification, then connected to resistor R133 for voltage division and electrolytic capacitor C70 for filtering, and then connected to current limiting resistor R156 and fine-tuning potentiometer RW3 for voltage division. The signal is then transmitted to pin 8 (C-AD port) of the U20 main control chip. After current analysis and calculation by the main control system, the data is sent to the display screen through pin 19 (RXD port) and pin 20 (TXD port) of the main control system chip. The display screen shows the C-phase current value and operating status information.

[0060] When the three-phase current values ​​of the main circuit A / B / C exceed the preset range, the LD2 port of pin 26 of the main control system chip sends a command to light up the LED LD6 in the fault cause indicator circuit 18 to indicate the overcurrent fault information. At the same time, the RY1 port of pin 22 of the main control system chip triggers the control circuit 9 to drive the miniature relay RLY3 to disconnect the secondary circuit of the vacuum contactor, cut off the main circuit power supply, and protect the fan from overcurrent fault. Simultaneously, the RY2 alarm relay of pin 21 of the main control system chip is triggered to close and connect the alarm device to output an alarm prompt. At the same time, the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip send data to the display screen, and the display screen displays the overcurrent fault information. When the current sensor detects that one or two phases of the three-phase circuit A / B / C in the main circuit have no current signal, the LD3 port of pin 27 of the main control system chip sends a command to light up the LED LD7 in the fault cause indicator circuit 18 to indicate the phase loss fault information. At the same time, the RY1 port of pin 22 of the main control system chip triggers the control circuit 9 to drive the miniature relay RLY3 to disconnect the secondary circuit of the vacuum contactor, cut off the main circuit power supply, and protect the fan from phase loss operation fault. At the same time, the RY2 alarm relay of pin 21 of the main control system chip is triggered to close and connect the alarm device to output an alarm prompt. Simultaneously, the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip send data to the display screen, and the display screen displays the phase loss fault information. When the current sensor detects that the three-phase current imbalance of the main circuit A / B / C is greater than 50%, the LD4 port of pin 8 of the main control system chip sends a command to light up the LED LD8 in the fault cause indicator circuit 18 to indicate the three-phase imbalance fault information. At the same time, the RY1 port of pin 22 of the main control system chip triggers the control circuit 9 to drive the miniature relay RLY3 to disconnect the secondary circuit of the vacuum contactor, cut off the main circuit power supply, and protect against the unbalanced operation fault of the fan. At the same time, the RY2 alarm relay of pin 21 of the main control system chip is triggered to close and connect the alarm device to output an alarm prompt. Simultaneously, the RXD port of pin 19 and the TXD port of pin 20 of the main control system chip send data to the display screen, and the display screen displays the three-phase imbalance fault information, realizing the protection functions of the protection device such as overcurrent, phase loss, and three-phase imbalance.

[0061] The communication transceiver module circuit 12 includes: a communication chip SSP3058 (U19), resistors R158, R159, R160, and R162, transistor Q5, ceramic capacitor C79, pin 1 of the communication chip U19 connected to one end of R158, pins 2 and 3 of U19 connected to resistor R160 and one end of pin 3 of transistor Q5, the power supply of pin 8 of U19 connected to one end of C79, pin 7 of U19 connected to one end of resistor R159, pin 6 of U19 connected to one end of resistor R162, pin 2 of transistor Q5 connected to one end of resistor R164, and pins 4 and 5 of U19 and pin 1 of transistor Q5 both grounded, forming the communication module circuit. The main control system transmits data to the display screen to show all the fan operation information via communication. The main control chip's pins A7-UART4-TXD and A7-UART4-RXD are connected to the A / B interface of the RS485 communication module circuit. The RS485 communication module circuit is composed of the communication SSP3085 transceiver chip, R158 / R159 / R160 / R162 / R164 / C79, and transistor Q5. Through the information transmission and reception of the RS485 communication module circuit, the control and display information are interconnected.

[0062] The power processing module circuit 13 includes: a switching power supply chip MP3302DJ, resistors R116, R115, R116, capacitor C50, U10, capacitor C46, ​​capacitor L6, capacitor C47, and capacitor C48. Pin 1 of U10 is connected to one end of capacitor C47 and one end of capacitor C48. Pin 2 of U10 is connected to the other end of capacitor C47 and the other end of capacitor C48. Pin 3 of U10 is connected to one end of capacitor C46, ​​and the other end of capacitor C46 is grounded. MP33... Pin 3 of MP3302DJ is connected to one end of R116. Pin 1 of MP3302DJ is connected to one end of L6 and one end of C50. Pin 5 of MP3302DJ is connected to one end of C49. Pin 4 of MP3302DJ is connected to one end of R115. The other end of R115 is connected to one end of R114. The power processing module circuit uses MP3302DJ switching power supply chip and R113 / R114 / R115. A constant current source power supply is formed by R116C49 / C50 diodes, D12 inductor, and L6. This constant current source power supply is then connected to an SSP1117-3.3V voltage regulator chip and C46 / C47 / C48 to form a voltage regulator power supply for the main control chip. A boost module is then connected to a switching power supply chip TPS61040, R125 diodes, D13 / D14 / D15, two BAT54S dual diodes, and C56 / C57 / C58 / C59 / C60 / C61 / C62 / C63 / C67 / C68 inductor, and L8 to provide power for the display screen.

[0063] The alarm output control circuit 14 includes: diode D23, miniature relay RLY4, transistor Q7, and resistor R172. Pin 3 of Q7 is connected to the positive terminal of diode D23 and one end of relay RLY4. The other end of RLY4 is connected to the negative terminal of D23 and connected to the power supply. Pin 2 of Q7 is connected to one end of R172, and pin 1 of Q7 is grounded. When the fan malfunctions, the alarm output circuit sends an alarm command through the RY2 port of pin 21 of the U20 main control chip, which connects to the current limiting R172 to drive transistor Q7 to conduct, energizes the miniature relay RLY4, closes, and activates the fault alarm, thus realizing the fault alarm indication.

[0064] The regional network transceiver module circuit 15 includes: a U21 communication chip TJA1050, inductors FB1 and FB2. Pin 7 of U21 is connected to one end of FB1, and pin 6 of U21 is connected to one end of FB2. The regional network transceiver module circuit uses regional network communication and can send wind turbine operation data to the management center's backend equipment to display wind turbine operation parameters and real-time status. The regional network transceiver module circuit consists of the information communication transceiver chip TJA1050 of the protection device, R170 / C82, three SMAJ6.0CA bidirectional transient TVS diodes, two surface mount inductors FB1 / FB2, and an Ethernet chip LAN8720. By sending data through the network transceiver module, the function of interconnecting information networks throughout the region is realized.

[0065] The main control system circuit 16 contains a U20 main control chip MM32SPIN27PT, ceramic capacitors C83, C84, C85, C86, resistors R173 and R175, and a running indicator SYS2, which together form the main control system circuit.

[0066] The fault cause indicator 18 contains current-limiting resistors R166, R167, R171, R174, and light-emitting diodes LED5, LED6, LED7, and LED8. One end of R166 is connected to one end of LED5, and the other end of LED5 is connected to pin 25 (LD1) of the main control chip U20. One end of R167 is connected to one end of LED6, and the other end of LED6 is connected to pin 26 (LD2) of the main control chip U20. One end of R171 is connected to one end of LED7, and the other end of LED7 is connected to pin 27 (LD3) of the main control chip U20. One end of R174 is connected to one end of LED8, and the other end of LED8 is connected to pin 28 (LD4) of the main control chip U20. This completes the fault cause indicator circuit.

[0067] The parameter setting button circuit 19 has tactile switches SW1, SW2, SW3 and SW4, which are connected to the main control chip U20's pins 12 (KEY1), 13 (KEY2), 14 (KEY3), and 15 (KEY4) to form the parameter setting button circuit.

[0068] The main control system chip circuit U20 uses MM32SPIN27PT as the main control system chip and auxiliary components, R169 / R173 / R175, C83 / C84 / C85 / C86, the operating status LED SYS2, and the system program writing port SWD2 to form the main control system circuit. Through zero-sequence transformers, voltage transformers, current signal acquisition sensors, and frequency signal acquisition sensors, the acquired signals are rectified, amplified, and processed before being transmitted to the main control chip. The edited system program then analyzes, calculates, and judges various signals, and transmits the data to the display screen and background display device via the communication module, realizing a complete intelligent fan protection device. The display screen shows all the fan's operating data, sent from the main control system. For fault indication, when the main control system detects and confirms a power leakage fault, it sends a command through the LD1 port of pin 25 of the main control system chip to light up LED LD5 to indicate the leakage fault. When the main control system detects and confirms an overload or overcurrent fault, it sends a command through the main control chip... The LD2 port on pin 26 sends a command to light up LED LD6 to indicate an overcurrent fault. When the main control system detects and confirms a phase loss fault, it sends a command through the LD3 port on pin 27 of the main control chip to light up LED LD7 to indicate a phase loss fault. When the main control system detects and confirms a three-phase imbalance fault, it sends a command through the LD4 port on pin 28 of the main control chip to light up LED LD8 to indicate a three-phase imbalance fault. The parameter setting button circuit uses 12*12*10H waterproof tactile switches as parameter setting buttons. SW1 is connected to the KEY1 pin of the U20 main control chip as a system menu setting selection key, SW2 is connected to the KEY2 pin of the U20 main control chip as a setting parameter increment key, SW3 is connected to the KEY3 pin of the U20 main control chip as a setting parameter decrement key, and SW4 is connected to the KEY4 pin of the U20 main control chip as a fault reset key, etc., which constitute the parameter button setting circuit. Example

[0069] This utility model employs a high-voltage resistant fuse to protect the main circuit from short circuits. When a short circuit fault occurs in the main circuit, the fuse melts instantly to protect the safety of the electrical equipment. Furthermore, a precision zero-sequence current transformer is used to collect the leakage current signal of the main circuit. When there is a grounding leakage in the main circuit, the vector sum of the currents passing through the zero-sequence current transformer is no longer zero, and the secondary winding of the transformer generates a current signal. The leakage current signal is collected by a signal detection circuit, and after being processed by amplification, it is transmitted to the main control chip U20 for analysis and judgment, and then a command is issued to cut off the power supply to protect electrical safety.

[0070] Furthermore, a vacuum contactor is used as the main circuit power supply control for the fan drive motor. When the fan malfunctions, the fault acquisition circuit transmits the fault signal to the main control chip circuit. After the main control system chip U20 analyzes, calculates, and confirms the fault, it issues a trip command to drive the control relay to close the secondary circuit of the vacuum contactor. The vacuum contactor control coil trips due to loss of voltage, and the main circuit is disconnected, reliably cutting off the main power supply to the fan, thus realizing timely power-off protection when the fan malfunctions.

[0071] A three-phase integrated current signal acquisition sensor was developed using electromagnetic induction technology. When the sensor acquires the operating current signal of the wind turbine, it is rectified and filtered by the signal processing circuit and then transmitted to the main control chip for analysis, calculation and fault judgment. Similarly, the current signal sensor uses electromagnetic induction technology to acquire the sinusoidal signal of the main circuit power supply as a frequency period signal. The signal is then amplified by the signal processing and amplification circuit and transmitted to the main control chip U20 for frequency calculation.

[0072] Finally, a voltage transformer is used to collect the main circuit voltage signal, which is then rectified and filtered by the signal processing circuit before being transmitted to the main control chip U20 for voltage value calculation. The small relay RLY3 controls the output to control the power supply of the secondary circuit of the vacuum contactor, thereby controlling the opening and closing of the vacuum contactor.

[0073] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A protective device for a heavy-duty locomotive's intelligent fan, comprising a protective device, characterized in that: The protection device includes a fuse (1), a zero-sequence transformer (2), a vacuum contactor (3), a current frequency sensor (4), a voltage transformer (5), a control coil (6), a leakage current signal processing circuit (7), a voltage signal processing circuit (8), a contactor secondary circuit control circuit (9), a frequency signal detection and amplification circuit (10), a three-phase current signal processing circuit (11), an information communication transceiver module circuit (12), a power processing module circuit (13), an alarm output circuit (14), a local area network transceiver module circuit (15), and a main control system circuit (16). The display interface (17), fault cause indicator (18), parameter setting button circuit (19) and fan drive motor (20) are provided. The three-phase main circuit power supply A / B / C phases are connected to three fuses (1), and the output terminals of the three fuses pass through the zero sequence transformer (2) and are connected to the input terminals L1 / L2 / L3 of the vacuum contactor (3). The output terminals T1 / T2 / T3 of the vacuum contactor (3) pass through the current frequency sensor (4) and are connected to the U / V / W terminals of the fan drive motor (20) to form a complete main circuit circuit. The main control system circuit (16) is connected to the leakage current signal processing circuit (7), voltage signal processing circuit (8), contactor secondary circuit control circuit (9), frequency signal detection and amplification circuit (10), three-phase current signal processing circuit (11), communication circuit transceiver module circuit (12), power processing module circuit (13), fault cause indicator (18), and parameter setting button circuit (19), respectively. The P1 and P2 ports of the leakage current signal processing circuit (7) are connected to the secondary terminals of the zero-sequence transformer (2). The V1 and V2 terminals of the voltage signal processing circuit (8) are connected to the secondary terminals of the voltage transformer (5). The primary terminal of the contactor (5) is connected to the main circuit L2 / L3. K1 and K2 of the secondary circuit control circuit (9) of the contactor are connected to the A1 and A2 terminals of the control coil (6) of the vacuum contactor. H1 and H2 ports of the frequency signal detection and amplification circuit (10) are connected to the CTB and common point COM of the current frequency sensor (4). The terminals CT1, CT2, CT3, and COM of the three-phase current signal processing circuit (11) are all connected to the CTA, CTB, CTC, and COM of the current frequency sensor (4). The terminals U, V, and W of the fan drive motor (20) are connected to the output terminals T1, T2, and T3 of the vacuum contactor (3).

2. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The leakage signal processing circuit (7) includes resistors R131 and R132, and operational amplifier LM358. Pin 3 of LM358 is connected to one end of R131, pin 1 of LM358 is connected to one end of R132, and pin 2 of LM358 is grounded.

3. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The voltage signal processing circuit (8) includes a diode D20, resistors R163 and R16, an electrolytic capacitor C81, and a fine-tuning potentiometer RW4. The two ends of D20 are connected in parallel with the two ends of R163, the two sides of R163 are connected in parallel with the two ends of C81, one end of C81 is connected to one end of R161, the other end of C81 is connected to one end of RW4, and the other end of RW4 is connected to the other end of R161.

4. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The vacuum contactor secondary circuit control circuit (9) includes a diode D22, a small relay RLY3 and a transistor S8050. The third pin of the S8050 is connected to one end of RLY3, the other end of RLY3 is connected to one end of D22, the second pin of the S8050 is connected to RY1, and the first pin of the S8050 is grounded.

5. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The frequency signal detection and amplification circuit (10) includes an operational amplifier LM358, resistors R154 and R153. Pin 7 of the LM358 is connected to one end of R154, pin 5 of the LM358 is connected to one end of R153, and pin 6 of the LM358 is grounded.

6. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The three-phase current signal processing circuit (11) includes diodes D17, D18, D19, resistors R130, R133, R144, R147, R156, R157, electrolytic capacitors C70, C75, C78, ​​and fine-tuning potentiometers RW1, RW2, and RW3. One end of R130 is connected to one end of C70, one end of R133, and one end of D17, respectively. The other end of R133 is connected to one end of RW1. The other ends of R133 and C70 are both connected to the other ends of RW1. R144... One end of R144 is connected to one end of C75, one end of R147, and one end of D18 respectively. The other end of R144 is connected to one end of RW2. The other ends of R147 and C75 are both connected to the other end of RW2. One end of R156 is connected to one end of C78, ​​one end of R157, and one end of D17 respectively. The other end of R156 is connected to one end of RW3. The other ends of R157 and C78 are both connected to the other end of RW3.

7. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The communication transceiver module circuit (12) includes a communication chip U19, resistors R158, R160, R159, R162, transistor Q5, and ceramic capacitor C79. One end of U19 is connected to one end of R158, one end of U19 is connected to one end of R160, one end of U19 is connected to one end of Q5, one end of U19 is connected to one end of C79, one end of U19 is connected to one end of R159, one end of U19 is connected to one end of R162, and one end of U19, one end of U19, and one end of Q5 are all grounded.

8. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The power processing module circuit (13) includes a switching power supply MP3302DJ, resistors R116, R115, R116, ceramic capacitors C50, C46, ​​L6, C47, C48, and U10. One pin of U10 is connected to one end of C47 and one end of C48, the other pin of U10 is connected to the other end of C47 and the other end of C48, the third pin of U10 is connected to one end of C46, ​​and the other end of C46 is grounded. One pin of MP3302DJ is connected to one end of R116, one pin of MP3302DJ is connected to one end of L6 and one end of C50, one pin of MP3302DJ is connected to one end of C49, one pin of MP3302DJ is connected to one end of R115, and the other end of R115 is connected to one end of R114.

9. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The alarm output circuit (14) includes a diode D23, a small relay RLY4, a transistor Q7 and a resistor R172. The third pin of Q7 is connected to one end of RLY4, the other end of RLY4 is connected to one end of D23, the second pin of Q7 is connected to one end of R172, and the first pin of Q7 is grounded.

10. The intelligent fan protection device for heavy locomotives according to claim 1, characterized in that: The local area network transceiver module circuit (15) includes a communication chip U21, an inductor FB1 and FB2. Pin 7 of U21 is connected to one end of FB1, and pin 6 of U21 is connected to one end of FB2.

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