Expander Status Detection Device and Detection System

Abstract

The present invention provides an expander status detection device and detection system. The expander status detection device control unit receives a detection instruction sent by a user through a receiving device via a wireless communication unit, activates the detection unit according to the detection instruction, and sends an instruction to the detection unit to obtain expander status information. After receiving the instruction sent by the control unit, the detection unit detects the temperature of the upper surface and the distance from the upper surface to the displacement detection module via a temperature detection module and a displacement detection module to obtain expander status information. The control unit receives the status information and sends the status information to the receiving device via the wireless communication unit. The present invention can solve the problem of inspectors being unable to observe the status of the expander, and can also detect the status of the expander, thereby quickly discovering the problem when the current transformer fails, ensuring the safe operation of the power system and avoiding the occurrence of power accidents and economic losses.

Description

Technical Field

[0001] The present invention relates to the field of power equipment safety detection, and in particular to an expander state detection device and a detection system. Background Art

[0002] Current transformers (CTs) perform current conversion and electrical isolation, and are crucial for the safe operation of power systems. Depending on the insulation medium, CTs are classified into oil-immersed, dry-type, and gas-insulated types. Oil-immersed CTs, which use transformer oil as their insulation medium, offer fast heat dissipation, uniform conduction, and recoverable insulation, making them widely used in power systems.

[0003] An oil-immersed current transformer (OT) has a metal expander installed above the oil tank as an oil compensator. When a OT fault occurs, resulting in a penetrating discharge, the arc causes the oil to crack and vaporize, increasing the internal pressure. This causes the expander to stretch compared to a healthy OT at the same temperature. When the OT's seal is compromised and oil leaks occur, the expander will contract compared to a healthy OT at the same temperature. Therefore, evaluating the expander's expansion and contraction at different temperatures is an effective way to determine if the OT is functioning properly.

[0004] Under normal circumstances, due to wiring and safety requirements, current transformers are installed at high places, making it difficult for inspectors to observe the status of the expanders on the current transformers with the naked eye. In addition, due to the long inspection cycle and the difficulty of inspection, inspectors cannot detect the status of the expanders in real time, making it difficult to quickly discover problems with the current transformers, affecting the safe operation of the power system and even leading to power accidents, resulting in serious economic losses. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the present invention proposes an expander status detection device and a detection system, which remotely receive detection instructions sent by the user and send the status information of the expander obtained by the detection unit to the user. It can solve the problem that the inspection personnel cannot observe the status of the expander, and can detect the status of the expander, so as to quickly discover the problem when the current transformer fails, ensuring the safe operation of the power system and avoiding the occurrence of power accidents and economic losses.

[0006] To solve the above problems, the present invention adopts a technical solution: an expander state detection device, which is fixed on the outer cover of the expander and opposite to the upper surface of the expander, and the expander state detection device includes: a wireless communication unit, a control unit and a detection unit, and the control unit is connected to the wireless communication unit and the detection unit respectively; the control unit receives a detection instruction sent by the user through a receiving device through the wireless communication unit, starts the detection unit according to the detection instruction, and sends an instruction to the detection unit to obtain state information of the expander, wherein the state information includes temperature and displacement information; the detection unit includes a temperature detection module and a displacement detection module, and after receiving the instruction sent by the control unit, the detection unit detects the temperature of the upper surface and the distance from the upper surface to the displacement detection module through the temperature detection module and the displacement detection module respectively to obtain the state information of the expander; the control unit receives the state information sent by the detection unit and sends the state information to the user's receiving device through the wireless communication unit.

[0007] Furthermore, the expander state detection device also includes a shell and a base, the base passes through the outer cover, the shell and the base are connected at one end outside the outer cover to form a cavity, and the control unit and the detection unit are accommodated in the cavity.

[0008] Furthermore, the base includes a bottom plate and bolts, the bolts pass through the bottom plate and the outer cover, and the outer shell is threadedly connected to the bolts.

[0009] Furthermore, the expander state detection device also includes a nut, which is located inside the outer cover and is threadedly connected to the bolt, and the base is fixed to the outer cover through the nut.

[0010] Furthermore, the bolt is provided with two through holes parallel to the bolt axis, the temperature detection module and the displacement detection module are respectively arranged in different through holes, and the temperature detection module and the displacement detection module are fixed through the through holes.

[0011] Furthermore, a waterproof window is provided at one end of the through hole close to the upper surface of the expander, and the waterproof window is nested in the through hole.

[0012] Furthermore, the expander state detection device also includes a power supply, which is connected to the control unit, the wireless communication unit and the detection unit respectively.

[0013] Furthermore, the control unit includes a signal processing module and a control module. The signal processing module is connected to the temperature detection module and the displacement detection module respectively. The signal processing module converts the analog signals sent by the temperature detection module and the displacement detection module into digital signals, and sends the digital signals to the control module for processing.

[0014] Furthermore, the expander state detection device further includes a main control board, the wireless communication unit and the control module are fixed on the same side of the main control board, and the signal processing module is fixed on the other side of the main control board.

[0015] Based on the same inventive concept, the present invention also proposes an expander state detection system, which includes a receiving device and an expander state detection device; the receiving device includes a processor, a memory and an information transceiver, and the processor is connected to the memory and the information transceiver respectively, and sends detection instructions to the expander state detection device and receives state information returned by the expander state detection device through the information transceiver, and stores the state information in the memory; the expander state detection device includes the expander state detection device as described above.

[0016] Compared with the existing technology, the beneficial effects of the present invention are: remotely receiving the detection instructions sent by the user through the wireless communication unit, and sending the status information of the expander obtained by the detection unit to the user, which can solve the problem that the inspection personnel cannot observe the status of the expander, and can realize the detection of the status of the expander, so as to quickly discover the problem when the current transformer fails, ensuring the safe operation of the power system, and avoiding the occurrence of power accidents and economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of an embodiment of an expander state detection device of the present invention;

[0018] Figure 2 A front view of an embodiment of an expander state detection device of the present invention;

[0019] Figure 3 An exploded view of an expander state detection device according to an embodiment of the present invention;

[0020] Figure 4 for Figure 3 A structural diagram of some components of an embodiment of an expander state detection device;

[0021] Figure 5 for Figure 3 A structural diagram of some components of another embodiment of the expander state detection device;

[0022] Figure 6This is a structural diagram of an embodiment of the expander status detection system of the present invention.

[0023] In the figure: 1. control unit; 2. wireless communication unit; 3. detection unit; 4. housing; 5. outer cover; 6. nut; 7. base; 8. power supply; 9. waterproof rubber ring; 71. bolt; 72. bottom plate; 10. waterproof window; 11. control module; 31. temperature detection module; 32. displacement detection module; 12. signal processing module; 81. high-temperature lithium battery; 82. supercapacitor. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] See also Figure 1-5 ,in, Figure 1 This is a structural diagram of an embodiment of an expander state detection device of the present invention; Figure 2 A front view of an embodiment of an expander state detection device of the present invention; Figure 3 An exploded view of an expander state detection device according to an embodiment of the present invention; Figure 4 for Figure 3 A structural diagram of some components of an embodiment of an expander state detection device; Figure 5 for Figure 3 The structure diagram of another embodiment of the expander state detection device is shown in FIG. Figure 1-5 The expander state detection device of the present invention is described in detail.

[0026] In this embodiment, the expander state detection device is fixed on the outer cover 5 of the expander and is opposite to the upper surface of the expander. The expander state detection device includes: a wireless communication unit 2, a control unit 1 and a detection unit 3. The control unit 1 is connected to the wireless communication unit 2 and the detection unit 3 respectively; the control unit 1 receives the detection instruction sent by the user through the receiving device through the wireless communication unit 2, starts the detection unit 3 according to the detection instruction, and sends an instruction to the detection unit 3 to obtain the state information of the expander, and the state information includes temperature and displacement information; the detection unit 3 includes a temperature detection module 31 and a displacement detection module 32. After receiving the instruction sent by the control unit 1, the detection unit 3 detects the temperature of the upper surface and the distance from the upper surface to the displacement detection module 32 through the temperature detection module 31 and the displacement detection module 32 respectively to obtain the state information of the expander; the control unit 1 receives the state information sent by the detection unit 3, and sends the state information to the user's receiving device through the wireless communication unit 2.

[0027] In this embodiment, the expander state detection device also includes an outer shell 4 and a base 7. The base 7 passes through the outer cover 5. The outer shell 4 and the base 7 are connected at one end outside the outer cover 5 to form a cavity. The control unit 1 and the detection unit 3 are accommodated in the cavity.

[0028] In a specific embodiment, the shell 4 is made of nylon fiber waterproof material of PA66+30GF+flame retardant+anti-aging agent, which has good anti-corrosion and anti-aging properties and provides protection for the entire device.

[0029] In this embodiment, the wireless communication unit 2 adopts a LoRa wireless module with a frequency band of 470MHz. The control unit 1 transmits the temperature and distance data collected by the detection unit 3 or the alarm information processed by the control unit 1 to the receiving device through the wireless communication unit 2 via a wireless link so that the user can obtain the status information of the expander or receive alarm information.

[0030] In this embodiment, the temperature detection module 31 uses a non-contact infrared temperature probe to measure the upper surface temperature of the expander. Since the distance between the temperature detection module 31 and the measured target will change, the temperature collected by the temperature detection unit 3 will have a larger error due to the increase in distance. Therefore, the temperature value is corrected by the distance value measured by the displacement detection module 32 to achieve better temperature accuracy in the full range (approximately ±2°C in a range of 500 mm).

[0031] In this embodiment, the displacement detection module 32 uses a laser ranging probe (laser wavelength is 930nm) for the relative distance between the upper surface and the sensing device, and has good measurement accuracy (accuracy is ±2mm in a range of 1 meter).

[0032] The base 7 includes a bottom plate 72 and a bolt 71 , and is the main body of other components of the detection device. The bolt 71 passes through the bottom plate 72 and the outer cover 5 , and the outer shell 4 is threadedly connected to one end of the bolt 71 located outside the outer cover 5 .

[0033] In this embodiment, a waterproof rubber ring 9 is provided between the housing 4 and the bottom plate 72 for waterproofing.

[0034] In this embodiment, the bottom plate 72 and the bolt 71 can be connected in one piece or by snapping, welding or other means.

[0035] In a specific embodiment, the base 7 is made of 304 stainless steel.

[0036] In this embodiment, the expander state detection device further includes a nut 6 , which is made of stainless steel, is located inside the outer cover 5 , is sleeved on the bolt 71 , and is threadedly connected to the bolt 71 , and the base 7 is fixed to the outer cover 5 through the nut 6 .

[0037] In order to detect the temperature and displacement of the upper surface of the expander through the detection unit 3, two through holes parallel to the axial direction of the bolt 71 are provided on the bolt 71. The through holes are opposite to the upper surface of the expander. The temperature detection module 31 and the displacement detection module 32 are respectively arranged in different through holes and fixed through the through holes.

[0038] In this embodiment, to protect the temperature detection module 31 and the displacement detection module 32, a waterproof window 10 is provided at one end of the through hole, which is closer to the upper surface of the expander. The waterproof window 10 is nested within the through hole. The temperature detection module 31 and the displacement detection module 32 are provided on the side of the waterproof window 10 that is farther from the upper surface of the expander.

[0039] In this embodiment, in order to further waterproof and fix the waterproof window 10, a waterproof rubber ring 9 is also provided between the waterproof window 10 and the through hole. The waterproof window 10 and the waterproof rubber ring 9 prevent water and other liquids from passing through the through hole to contact the temperature detection module 31 and the displacement detection module 32.

[0040] In this embodiment, the waterproof window 10 is waterproof glass. In other embodiments, it can also be a transparent plastic plate, quartz or other waterproof transparent materials.

[0041] In a specific embodiment, the waterproof window 10 covering one side of the temperature detection module 31 is made of germanium glass material (with coating), which enhances the transmittance of long infrared wavelengths (5.5um~14um, transmittance greater than 90%). The waterproof window 10 covering one side of the displacement detection module 32 is made of infrared-transmitting black glass material (without coating), which enhances the short infrared wavelengths (780nm~2500nm, transmittance greater than 90%). The visible light is cut off, thereby enhancing the anti-interference ability of the laser probe of the displacement detection module 32 in the light environment and improving the working stability of the displacement detection module 32.

[0042] In this embodiment, the expander state detection device further includes a power supply 8, which is connected to the control unit 1, the wireless communication unit 2 and the detection unit 3 respectively, and supplies power to the components in the expander state detection device through the power supply 8.

[0043] In this embodiment, the power supply 8 includes a high-temperature lithium battery 81 and a super capacitor 82 , and the super capacitor 82 is used to improve the power supply capability of the power supply 8 in a short time.

[0044] In a specific embodiment, the high-temperature lithium battery 81 is a disposable high-temperature lithium battery 81 with a capacity of 1200 mAh and a supply voltage of 3.6V.

[0045] In this embodiment, the control unit 1 includes a signal processing module 12 and a control module 11. The signal processing module 12 is connected to the temperature detection module 31 and the displacement detection module 32, respectively. The signal processing module 12 converts the analog signals sent by the temperature detection module 31 and the displacement detection module 32 into digital signals, and sends the digital signals to the control module 11 for processing.

[0046] In this embodiment, the control module 11 adopts a low-power microprocessor. The control module 11 communicates with the wireless communication unit 2 and the detection unit 3 through various interfaces (including I2C, SPI, UART, etc.). The control unit 1 controls the operation process of the entire device, and also converts the digital signal transmitted by the detection unit 3 (temperature detection module 31, displacement detection module 32) or the signal processing module 12 into the value of the corresponding physical quantity (the temperature value of the upper surface measured by the temperature detection module 31, the distance from the upper surface to the device measured by the displacement detection module 32) and compares the distance with the distance from the expander to the expander state detection device when the expander is not extended or retracted to determine whether displacement occurs and issue an alarm message when the displacement exceeds the preset value.

[0047] In this embodiment, the signal processing module 12 converts the temperature data of the upper surface of the expander from an analog signal into a digital signal, and the digital signal is then verified by the control module 11 to calculate the ambient temperature value.

[0048] In this embodiment, the expander state detection device further includes a main control board, the wireless communication unit 2 and the control module 11 are fixed on the same side of the main control board, and the signal processing module 12 is fixed on the other side of the main control board.

[0049] In a specific embodiment, the signal processing module 12 and the power supply 8 are arranged on the same side of the main control board.

[0050] In this embodiment, the expander state detection device also includes a first circuit board and a second circuit board, wherein the temperature detection module 31 is fixed on the first circuit board, and the displacement detection module 32 is fixed on the second circuit board. The first circuit board is fixed on one side of the main control board, perpendicular to the main control board, and the two are connected through pin headers and female headers, and the second circuit board is connected to the first circuit board through a wire.

[0051] In a specific embodiment, the signal processing module 12 is connected to the temperature detection module 31, the displacement detection module 32, and the control module 11, and includes a low-noise amplifier, a filter, a digital-to-analog converter, and a digital signal processor. Its main function is to convert the analog signals output by the temperature detection module 31 and the displacement detection module 32 into digital signals, and output the digital signals to the control module 11. The signal processing module 12 can form an independent module or be included in the detection unit 3 or the control unit 1.

[0052] In a specific embodiment, the temperature detection module 31 is connected to the signal processing module 12 and the control module 11. The temperature detection module 31 is mainly composed of an infrared-sensitive thermopile detector and a signal conditioner. It uses infrared temperature measurement to collect the upper surface temperature analog signal of the current transformer expander and transmits the temperature analog signal containing temperature data to the signal processing module 12. After passing through a low-noise amplifier, a filter, an analog converter, and a digital signal processor, the temperature analog signal is converted into a temperature digital signal containing temperature data. Finally, the temperature digital signal is read by the control module 11. After completing a measurement, the temperature detection module 31 enters sleep mode. When another measurement task arrives, the control module 11 wakes up the temperature detection unit 3.

[0053] The displacement detection module 32 is connected to the signal processing module 12 and the control module 11. It consists of a laser generator and a single-photon avalanche diode receiving array. By measuring the time it takes for a laser pulse to travel from the top surface to the back surface, it calculates the distance between the top surface of the current transformer expander and the device, thereby detecting changes in the expander's telescopic position. After completing a measurement, the displacement detection module 32 enters sleep mode until awakened by the control module 11 for the next measurement.

[0054] In this embodiment, the wireless communication unit 2 is used to perform two-way wireless communication with the receiving device. The wireless communication unit 2 can send the measured status information to the receiving device, and the receiving device then transmits the status information to the server or mobile terminal through the 4G network or Ethernet, so that the inspection personnel can remotely and in real time view the status of the current transformer expander. It can also receive instructions from the receiving device to trigger a data measurement. The main application scenario is when it is suspected that the current transformer is operating at a fault, the inspection personnel can actively obtain the status information of the expander to obtain the status of the current transformer based on the status information.

[0055] In this embodiment, the control module 11 is used to configure the operating parameters of the temperature detection module 31, the displacement detection module 32, and the wireless communication unit 2, control the measurement cycle of the temperature detection module 31 and the displacement detection module 32, and calibrate and store the measured temperature data and distance data.

[0056] In a preferred embodiment, the expander state detection device supplies power to the entire device through the power supply 8. In order to reduce the overall power consumption of the system, the temperature detection module 31, the displacement detection module 32, the wireless communication unit 2 and the control module 11 can all use low-power devices. When there is no measurement task, the temperature detection module 31, the displacement detection module 32 and the control module 11 are all in sleep mode. When the wireless communication unit 2 receives a measurement instruction from an external receiving device, the wireless communication unit 2 wakes up the control module 11, and the control module 11 then wakes up the temperature detection module 31 and the displacement detection module 32 for measurement.

[0057] In a specific embodiment, the receiving device includes a processor, a memory, and an information transceiver. The processor is connected to the memory and the information transceiver, respectively, and is used to configure and control the memory, the information transceiver, and the processing of the expander status information of the current transformer. The memory is connected to the processor and is used to store current and historical status information of the current transformer expander. The information transceiver is connected to the processor and is used to establish a bidirectional wireless communication channel with the wireless communication unit 2 of the expander status detection device, receive data from the expander status detection device, and send instructions to the expander status detection device.

[0058] In this embodiment, the receiving device further includes a data transmitter connected to the processor and configured to transmit status information of the current transformer expander or alarm information processed by the processor to the receiving terminal.

[0059] In this embodiment, the receiving terminal may be a server or a handheld device. In other embodiments, the receiving terminal may also be directly connected to the expander state detection device via the wireless communication unit 2 to send instructions to the expander state detection device and receive the state data and alarm information returned by the expander state detection device.

[0060] Beneficial effect: The expander status detection device of the present invention remotely receives the detection instructions sent by the user, and sends the status information of the expander obtained through the detection unit to the user, which can solve the problem that the inspection personnel cannot observe the status of the expander, and can detect the status of the expander, so as to quickly discover the problem when the current transformer fails, ensuring the safe operation of the power system and avoiding the occurrence of power accidents and economic losses.

[0061] Based on the same inventive concept, the present invention also proposes an expander status detection system, see Figure 6 , Figure 6 FIG1 is a structural diagram of an embodiment of the expander state detection system of the present invention. Figure 6 The expander state detection system of the present invention is described in detail.

[0062] The expander state detection system includes a receiving device and an expander state detection device; the receiving device includes a processor, a memory and an information transceiver, the processor is connected to the memory and the information transceiver respectively, sends detection instructions to the expander state detection device and receives state information returned by the expander state detection device through the information transceiver, and stores the state information in the memory.

[0063] Wherein, the expander state detection device further includes the expander state detection device as described in the above embodiment.

[0064] In one specific embodiment, a processor of the receiving device is connected to a memory and an information transceiver, respectively, for configuring and controlling the memory, the information transceiver, and processing the expander status information of the current transformer. The memory is connected to the processor and is configured to store received current and historical status information of the current transformer expander. The information transceiver is connected to the processor and is configured to establish a bidirectional wireless communication channel with a wireless communication unit of the expander status detection device, receiving data transmitted from the expander status detection device and sending instructions to the expander status detection device.

[0065] In this embodiment, the receiving device further includes a data transmitter connected to the processor and configured to transmit status information of the current transformer expander or alarm information processed by the processor to the receiving terminal.

[0066] In this embodiment, the receiving terminal may be a server or a handheld device. In other embodiments, the receiving terminal may also be directly connected to the expander state detection device via a wireless communication unit to send instructions to the expander state detection device and receive the state data and alarm information returned by the expander state detection device.

[0067] The expander status detection device is mounted on the outer cover of the current transformer expander via bolts. The device measures the relative distance between the upper surface of the current transformer expander and the detection device, as well as the surface temperature of the current transformer expander. The device then transmits the displacement and temperature information of the current transformer expander to a receiving device via a wireless communication unit for transmission to a server or receiving terminal. Inspection personnel can remotely, in real time, conveniently, and intuitively obtain the position and temperature information of the current transformer expander via a computer or mobile phone, thereby promptly detecting fault information of the current transformer and thereby promptly eliminating potential safety hazards of the current transformer and ensuring its safe operation. The expander status detection device is fixed to the outer cover via bolts and nuts, making it easy to install without changing the original sealing structure of the current transformer. Data is transmitted using power supply and wireless communication, avoiding the complex wiring of power and signal cables during installation.

[0068] Beneficial effects: The expander status detection system of the present invention remotely receives the detection instructions sent by the user, and sends the status information of the expander obtained through the detection unit to the user, which can solve the problem that the inspection personnel cannot observe the status of the expander, and can detect the status of the expander, so as to quickly discover the problem when the current transformer fails, ensuring the safe operation of the power system and avoiding the occurrence of power accidents and economic losses.

[0069] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, modules and units can be implemented in other ways. For example, the device implementation described above is only exemplary. For example, the division of the modules or is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of the device or, which can be electrical, mechanical or other forms.

[0070] The components described as separate components may or may not be physically separate, and the components shown may or may not be physical, that is, they may be located in one place or distributed in multiple locations. Some or all of them may be selected according to actual needs to achieve the purpose of this embodiment.

[0071] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An expander state detection device, characterized in that: The expander state detection device is fixed on the outer cover of the expander and is opposite to the upper surface of the expander. The expander state detection device includes: a wireless communication unit, a control unit and a detection unit. The control unit is connected to the wireless communication unit and the detection unit respectively. The control unit receives a detection instruction sent by a user through a receiving device through the wireless communication unit, starts the detection unit according to the detection instruction, and sends an instruction to the detection unit to obtain status information of the expander, wherein the status information includes temperature and displacement information; The detection unit includes a temperature detection module and a displacement detection module. After receiving the instruction sent by the control unit, the detection unit detects the temperature of the upper surface and the distance from the upper surface to the displacement detection module through the temperature detection module and the displacement detection module respectively to obtain the status information of the expander; The control unit receives the status information sent by the detection unit and sends the status information to a receiving device of the user via the wireless communication unit; The expander state detection device further includes a housing and a base, the base passing through the outer cover, the housing and one end of the base located outside the outer cover are connected to form a cavity, and the control unit and the detection unit are accommodated in the cavity; The base includes a bottom plate and a bolt, the bolt passes through the bottom plate and the outer cover, and the outer shell is threadedly connected to the bolt; The expander state detection device further includes a nut, the nut being located inside the outer cover and being threadedly connected to the bolt, and the base being fixed to the outer cover by the nut; The bolt is provided with two through holes parallel to the bolt axis, the temperature detection module and the displacement detection module are respectively arranged in different through holes, and the temperature detection module and the displacement detection module are fixed through the through holes; A waterproof window is further provided at one end of the through hole close to the upper surface of the expander, and the waterproof window is nested in the through hole.

2. The expander state detection device according to claim 1, wherein: The expander state detection device further includes a power supply, which is connected to the control unit, the wireless communication unit, and the detection unit respectively.

3. The expander state detection device according to claim 1, wherein: The control unit includes a signal processing module and a control module. The signal processing module is connected to the temperature detection module and the displacement detection module respectively. The signal processing module converts the analog signals sent by the temperature detection module and the displacement detection module into digital signals and sends the digital signals to the control module for processing.

4. The expander state detection device according to claim 3, wherein: The expander state detection device further includes a main control board, the wireless communication unit and the control module are fixed on the same side of the main control board, and the signal processing module is fixed on the other side of the main control board.

5. An expander status detection system, characterized in that: The expander state detection system includes a receiving device and an expander state detection device; The receiving device includes a processor, a memory, and an information transceiver, wherein the processor is connected to the memory and the information transceiver respectively, sends a detection instruction to the expander state detection device and receives state information returned by the expander state detection device through the information transceiver, and stores the state information in the memory; The expander state detection device includes the expander state detection device according to any one of claims 1 to 4.

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