Transformer on-line monitoring system

Abstract

The utility model discloses a transformer on-line monitoring system, which relates to the technical field of transformer on-line monitoring and comprises a data acquisition and transmission module and a monitoring terminal. The data acquisition and transmission module comprises a temperature sensor, a vibration sensor, a UHF partial discharge sensor, a multiplexing switch, a data preprocessing module, a microcontroller module, a clock module, a storage module, a wireless communication module and a power supply module; the monitoring terminal comprises a data receiving and transmitting module, a main control module, an alarm module, an interface module, a power supply module and a display module; according to the utility model, the vibration, noise, temperature and partial discharge of the transformer during operation can be monitored in real time, the monitoring is more comprehensive, the turbidity of the cooling oil of the transformer can be automatically sampled and detected, the detection data is more reliable, and the cooling oil can be conveniently maintained and replaced in time subsequently.

Description

Technical Field

[0001] The utility model relates to the technical field of on-line monitoring of transformers, in particular to an on-line monitoring system for transformers. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Its main components are the primary coil, secondary coil, and iron core. Its main functions include: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization, etc. A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Its main components are the primary coil, secondary coil, and iron core. In electrical equipment and wireless circuits, it is commonly used for stepping up and down voltages, impedance matching, safety isolation, etc. To ensure the normal operation of the transformer, various sensors are usually used to monitor the temperature, partial discharge, and noise during the operation of the transformer. Since a large amount of heat is generated when the transformer operates, the transformer usually uses cooling oil to cool down and dissipate heat during operation. However, impurities will appear after the long-term use of the cooling oil, affecting the heat dissipation of the transformer. In the prior art, the cooling oil of the transformer is usually sampled and detected manually at regular intervals, and the monitoring of the cooling oil is not timely enough, which is likely to cause damage to the transformer. Therefore, we propose an on-line monitoring system for transformer status. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an on-line monitoring system for transformers aiming at the deficiencies of the background art; it is convenient to monitor the vibration, noise, temperature, and partial discharge during the operation of the transformer in real time, the monitoring is more comprehensive, and it can also automatically sample and detect the turbidity of the cooling oil of the transformer, and the detection data is more reliable, which is convenient for subsequent timely maintenance and replacement of the cooling oil.

[0004] The utility model adopts the following technical solutions to solve the above technical problems:

[0005] An on-line monitoring system for transformers includes a data acquisition and transmission module and a monitoring terminal; the data acquisition and transmission module is wirelessly connected to the monitoring terminal;

[0006] The data acquisition and transmission module includes a temperature sensor, a vibration sensor, a UHF partial discharge sensor, a multiplexer switch, a data preprocessing module, a microcontroller module, a clock module, a storage module, a wireless communication module, and a power supply module; the temperature sensor, vibration sensor, and UHF partial discharge sensor are respectively connected to the microcontroller module through the multiplexer switch and the data preprocessing module in sequence, and the clock module, storage module, wireless communication module, and power supply module are respectively connected to the microcontroller module;

[0007] The monitoring terminal includes a data transceiver module, a main control module, an alarm module, an interface module, a power supply module, and a display module; the data transceiver module, the alarm module, the interface module, the power supply module, and the display module are respectively connected to the main control module.

[0008] As a further preferred solution of an on-line monitoring system for a transformer of the present invention, the data preprocessing module includes an amplifier circuit and a dual-op amp band-pass filter. The amplifier circuit consists of an OPA277 operational amplifier and resistors and capacitors. The dual-op band-pass filter consists of 2 OPA277 operational amplifiers; specifically, it includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. Among them, the signal input -IN terminal is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier. The other end of the first capacitor is respectively connected to the other end of the third resistor and the output pin of the first operational amplifier. The signal input +IN terminal is connected to one end of the second resistor, and the other end of the second resistor is respectively connected to the positive power supply pin of the first operational amplifier, one end of the fourth resistor, and one end of the second capacitor. The other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is respectively connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is respectively connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is respectively connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

[0009] As a further preferred solution of an on-line monitoring system for a transformer of the present invention, the wireless communication module includes an antenna ANT1, capacitors C1, C2, C3, C4, C5, C6, resistors R1, R2, inductors L1, L2, chips U1, U2, U3, and a VDD terminal;

[0010] Among them, the antenna ANT1 is respectively connected to one end of the inductor L1 and one end of the capacitor C6. The other end of the inductor L1 is grounded. The other end of the capacitor C6 is respectively connected to one end of the inductor L2 and the pin 2 of the chip U1. The other end of the inductor L2 is grounded. The pin 3 and the pin 4 of the chip U1 are respectively connected to one end of the capacitor C4, one end of the capacitor C5 and the VDD terminal. The other ends of the capacitor C4 and the capacitor C5 are respectively grounded. The pin 1 of the chip U1 is respectively connected to one end of the capacitor C3, the VDD terminal, the pin 30 of the chip U1 and the pin 29 of the chip U1. The other end of the capacitor C3 is grounded. The pin 31 of the chip U1 is connected to one end of the resistor R1. The other end of the resistor R1 is grounded. The pin 28 of the chip U1 is respectively connected to one end of the capacitor C1 and the pin 1 of the chip U2. The pin 2 of the chip U2 is grounded. The other end of the capacitor C1 is grounded. The pin 4 of the chip U2 is grounded. The pin 3 of the chip U2 is respectively connected to one end of the capacitor C2 and the pin 27 of the chip U1. The other end of the capacitor C2 is grounded. The pin 18 of the chip U1 is connected to the pin 7 of the chip U3. The pin 19 of the chip U1 is connected to the pin 3 of the chip U3. The pin 20 of the chip U1 is connected to the pin 1 of the chip U3. The pin 21 of the chip U1 is connected to the pin 6 of the chip U3 through the resistor R2. The pin 22 of the chip U1 is connected to the pin 2 of the chip U3. The pin 23 of the chip U1 is connected to the pin 5 of the chip U3. The pin 17 of the chip U1 is respectively connected to the pin 11 of the chip U1 and the VDD terminal.

[0011] As a further preferred solution of an on-line monitoring system for a transformer of the present utility model, the chip model of the multiplexing switch is AMC4601.

[0012] As a further preferred solution of an on-line monitoring system for a transformer of the present utility model, the data storage module selects the Micron 4Gbit-capacity DDR3-SDRAM storage chip MT41J256M16HA-125 as the cache medium.

[0013] As a further preferred solution of an on-line monitoring system for a transformer of the present utility model, the power supply module includes an AVS voltage regulation single path and a core voltage output circuit. The AVS voltage regulation single path and the core voltage output circuit include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first inductor L1, a chip MP2122, a voltage +5V terminal, a voltage regulation circuit output AVS terminal, and a core voltage output CPU terminal;

[0014] Among them, the +5V voltage terminal is respectively connected to one end of the first capacitor C1, one end of the second capacitor C2, the EN1 terminal of the chip MP2122, and the IN terminal of the chip MP2122. The other ends of the first capacitor C1 and the second capacitor C2 are connected and grounded. The SW1 terminal of the chip MP2122 is connected to one end of the first inductor L1. The other end of the first inductor L1 is respectively connected to one end of the first resistor R1, one end of the third capacitor C3, one end of the fourth capacitor C4, and the core voltage output CPU terminal. The other ends of the third capacitor C3 and the fourth capacitor C4 are connected and grounded. The other end of the first resistor R1 is respectively connected to one end of the third resistor R3, one end of the fourth resistor R4, and one end of the second resistor R2. The other end of the third resistor R3 is grounded. The other end of the fourth resistor R4 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and one end of the fifth capacitor C5. The other end of the fifth resistor R5 is connected to the regulated voltage circuit output AVS terminal. The other end of the fifth capacitor C5 is grounded. The other end of the second resistor R2 is connected to the FB1 terminal of the chip MP2122.

[0015] Compared with the prior art, the present utility model adopts the above technical solutions and has the following technical effects:

[0016] For an on-line monitoring system of a transformer of the present utility model, a temperature sensor, a vibration sensor, and a UHF partial discharge sensor are installed at appropriate positions of the transformer. The temperature sensor can detect the temperature of the transformer during operation. The vibration sensor can detect the vibration generated by the transformer during operation. The UHF partial discharge sensor can detect the partial discharge of the transformer during operation. At the same time, various detection data are fed back to the controller, and the controller feeds back the state of the transformer during operation to an external terminal through a wireless signal generator, which is convenient for real-time monitoring of the operation state of the transformer and makes the monitoring more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of an on-line monitoring system of a transformer of the present utility model;

[0018] Figure 2 is a structural schematic diagram of a data acquisition and transmission module of the present utility model;

[0019] Figure 3 is a structural schematic diagram of a monitoring terminal of the present utility model;

[0020] Figure 4 is a structural schematic diagram of a data preprocessing module of the present utility model;

[0021] Figure 5 is a circuit diagram of a wireless communication module of the present utility model;

[0022] Figure 6This is the circuit diagram of the power supply module of the utility model. Detailed implementation manners

[0023] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings:

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0025] A transformer on-line monitoring system is as Figure 1 shown, and includes a data acquisition and transmission module and a monitoring terminal; the data acquisition and transmission module is wirelessly connected to the monitoring terminal;

[0026] As Figure 2 shown, the data acquisition and transmission module includes a temperature sensor, a vibration sensor, a UHF partial discharge sensor, a multiplexer switch, a data preprocessing module, a microcontroller module, a clock module, a storage module, a wireless communication module, and a power supply module; the temperature sensor, the vibration sensor, and the UHF partial discharge sensor are respectively connected to the microcontroller module through the multiplexer switch and the data preprocessing module in sequence, and the clock module, the storage module, the wireless communication module, and the power supply module are respectively connected to the microcontroller module;

[0027] The utility model is convenient for real-time monitoring of the vibration, noise, temperature, and partial discharge during the operation of the transformer, and the monitoring is more comprehensive. Moreover, it can also automatically sample and detect the turbidity of the cooling oil of the transformer, and the detection data is more reliable, which is convenient for subsequent timely maintenance and replacement of the cooling oil.

[0028] As Figure 3 shown, the monitoring terminal includes a data transceiver module, a main control module, an alarm module, an interface module, a power supply module, and a display module; the data transceiver module, the alarm module, the interface module, the power supply module, and the display module are respectively connected to the main control module.

[0029] The utility model installs the temperature sensor, the vibration sensor, and the UHF partial discharge sensor at appropriate positions of the transformer. The temperature sensor can detect the temperature of the transformer during operation, the vibration sensor can detect the vibration generated by the transformer during operation, and the UHF partial discharge sensor can detect the partial discharge of the transformer during operation. At the same time, various detection data are fed back to the controller, and the controller feeds back the state of the transformer during operation to the external terminal through the wireless signal generator, which is convenient for real-time monitoring of the operation state of the transformer, and the monitoring is more comprehensive.

[0030] As Figure 4 shown, the data preprocessing module includes an amplifier circuit and a dual operational amplifier band-pass filter. The amplifier circuit consists of an OPA277 operational amplifier and resistors and capacitors. The dual operational amplifier band-pass filter consists of 2 OPA277 operational amplifiers. Specifically, it includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. Among them, the signal input -IN terminal is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier. The other end of the first capacitor is respectively connected to the other end of the third resistor and the output pin of the first operational amplifier. The signal input +IN terminal is connected to one end of the second resistor, and the other end of the second resistor is respectively connected to the positive power supply pin of the first operational amplifier, one end of the fourth resistor, and one end of the second capacitor. The other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is respectively connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is respectively connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is respectively connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

[0031] The signal processing module of the present utility model amplifies and filters the data collected by the array sensor and then inputs it into the signal conversion circuit, greatly reducing the signal noise and signal loss in the measurement. Among them, the amplifier circuit part is an amplifier circuit composed of an OPA277 operational amplifier and resistors and capacitors. This circuit is a typical differential amplifier circuit. At the same time, C3 and R6, C4 and R7 form a low-pass filter.

[0032] A dual-op amp band-pass filter consists of two OPA277 operational amplifiers. The Q value and center frequency of the designed band-pass filter are adjustable. Adjusting R9 can adjust the resonant frequency of the circuit, and adjusting R8 can adjust the Q value of the circuit. It should be noted that after the dew condensation signals at each point are collected by the array-type dew condensation sensor, they are selected and output by the multiplexed analog switch to the signal processing circuit and then input to the AD7794 for analog-to-digital conversion, converting the analog signal into a digital signal, which is beneficial to the long-distance wireless transmission of the signal. It should be noted that the noise of the 24-bit Σ-Δ analog-to-digital converter AD7794 is only 40 nV, and the power consumption current is only 400 μA, which is especially suitable for applications requiring low power consumption and high-precision measurement.

[0033] As Figure 5 shown, the wireless communication module includes an antenna ANT1, capacitors C1, C2, C3, C4, C5, C6, resistors R1, R2, inductors L1, L2, chips U1, U2, U3, and a VDD terminal;

[0034] Among them, the antenna ANT1 is respectively connected to one end of the inductor L1 and one end of the capacitor C6. The other end of the inductor L1 is grounded. The other end of the capacitor C6 is respectively connected to one end of the inductor L2 and the pin 2 of the chip U1. The other end of the inductor L2 is grounded. The pin 3 and the pin 4 of the chip U1 are respectively connected to one end of the capacitor C4, one end of the capacitor C5, and the VDD terminal. The other ends of the capacitor C4 and the capacitor C5 are respectively grounded. The pin 1 of the chip U1 is respectively connected to one end of the capacitor C3, the VDD terminal, the pin 30 of the chip U1, and the pin 29 of the chip U1. The other end of the capacitor C3 is grounded. The pin 31 of the chip U1 is connected to one end of the resistor R1. The other end of the resistor R1 is grounded. The pin 28 of the chip U1 is respectively connected to one end of the capacitor C1 and the pin 1 of the chip U2. The pin 2 of the chip U2 is grounded. The other end of the capacitor C1 is grounded. The pin 4 of the chip U2 is grounded. The pin 3 of the chip U2 is respectively connected to one end of the capacitor C2 and the pin 27 of the chip U1. The other end of the capacitor C2 is grounded. The pin 18 of the chip U1 is connected to the pin 7 of the chip U3. The pin 19 of the chip U1 is connected to the pin 3 of the chip U3. The pin 20 of the chip U1 is connected to the pin 1 of the chip U3. The pin 21 of the chip U1 is connected to the pin 6 of the chip U3 through the resistor R2. The pin 22 of the chip U1 is connected to the pin 2 of the chip U3. The pin 23 of the chip U1 is connected to the pin 5 of the chip U3. The pin 17 of the chip U1 is respectively connected to the pin 11 of the chip U1 and the VDD terminal.

[0035] This utility model selects ESP8266 as the main control chip. Additionally, when used as a communication module, it accesses the Internet through a serial port to WIFI for data transmission of terminal devices. The communication mode adopts a basic network topology structure. ESP8266 is a serial port to wireless module chip with built-in firmware, making it easy for users to operate without the need to write timing signals, etc.

[0036] The chip model of the multiplexer switch is AMC4601.

[0037] The data storage module selects the 4Gbit-capacity DDR3-SDRAM storage chip MT41J256M16HA-125 from Micron as the cache medium.

[0038] As Figure 6 shown, the power supply module includes an AVS voltage regulation single path and a core voltage output circuit. The AVS voltage regulation single path and the core voltage output circuit include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first inductor L1, a chip MP2122, a voltage +5V terminal, a voltage regulation circuit output AVS terminal, and a core voltage output CPU terminal; among them, the voltage +5V terminal is respectively connected to one end of the first capacitor C1, one end of the second capacitor C2, the EN1 terminal of the chip MP2122, and the IN terminal of the chip MP2122. The other ends of the first capacitor C1 and the second capacitor C2 are connected and grounded. The SW1 terminal of the chip MP2122 is connected to one end of the first inductor L1. The other end of the first inductor L1 is respectively connected to one end of the first resistor R1, one end of the third capacitor C3, one end of the fourth capacitor C4, and the core voltage output CPU terminal. The other ends of the third capacitor C3 and the fourth capacitor C4 are connected and grounded. The other end of the first resistor R1 is respectively connected to one end of the third resistor R3, one end of the fourth resistor R4, and one end of the second resistor R2. The other end of the third resistor R3 is grounded. The other end of the fourth resistor R4 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and one end of the fifth capacitor C5. The other end of the fifth resistor R5 is connected to the voltage regulation circuit output AVS terminal. The other end of the fifth capacitor C5 is grounded. The other end of the second resistor R2 is connected to the FB1 terminal of the chip MP2122.

[0039] The power supply module mainly uses high-efficiency DC / DC such as MP2122. After current evaluation, two relatively critical and high-power-consuming power supplies are mainly considered. For the 1.1V voltage of the core of Hi3516D, the average current is about 900mA and the maximum current is 1A. Considering the influence of temperature and leaving a design margin of more than 50%, and then comprehensively considering the layout space, cost, and supply cycle, MP2122 is selected to provide the 1.1V voltage for the core of Hi3516D.

[0040] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A transformer online monitoring system, characterized in that: It includes a data acquisition and transmission module and a monitoring terminal; the data acquisition and transmission module is connected to the monitoring terminal via wireless; The data acquisition and transmission module comprises a temperature sensor, a vibration sensor, a UHF partial discharge sensor, a multiplexing switch, a data preprocessing module, a microcontroller module, a clock module, a storage module, a wireless communication module and a power module; the temperature sensor, the vibration sensor and the UHF partial discharge sensor are respectively connected to the microcontroller module through the multiplexing switch and the data preprocessing module in sequence, and the clock module, the storage module, the wireless communication module and the power module are respectively connected to the microcontroller module; The monitoring terminal comprises a data transceiver module, a main control module, an alarm module, an interface module, a power supply module, and a display module; the data transceiver module, the alarm module, the interface module, the power supply module, and the display module are respectively connected to the main control module.

2. A transformer online monitoring system according to claim 1, characterized in that: The data preprocessing module includes an amplifier circuit and a dual operational amplifier bandpass filter, wherein the amplifier circuit is composed of an OPA277 operational amplifier and a resistor and a capacitor, and the dual operational amplifier bandpass filter is composed of two OPA277 operational amplifiers; specifically, it includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier, wherein the signal input -IN terminal is connected to one end of the first resistor, the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the third resistor and the negative power supply pin of the first operational amplifier, the other end of the first capacitor is respectively connected to the other end of the third resistor and the output pin of the first operational amplifier, and the signal input +IN terminal is connected to the second resistor One end of the second resistor is respectively connected to the positive power pin of the first operational amplifier, one end of the fourth resistor, and one end of the second capacitor. The other end of the second capacitor is connected to the other end of the fourth resistor and is grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the positive power pin of the second operational amplifier. The negative power pin of the second operational amplifier is connected to the negative power pin of the third operational amplifier. The positive power pin of the third operational amplifier is respectively connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is respectively connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is respectively connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

3. A transformer online monitoring system according to claim 1, characterized in that: The wireless communication module includes an antenna ANT1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, an inductor L1, an inductor L2, a chip U1, a chip U2, a chip U3, and a VDD terminal. Among them, the antenna ANT1 is respectively connected to one end of the inductor L1 and one end of the capacitor C6, and the other end of the inductor L1 is grounded. The other end of the capacitor C6 is respectively connected to one end of the inductor L2 and the pin 2 of the chip U1, and the other end of the inductor L2 is grounded. The pin 3 of the chip U1 and the pin 4 of the chip U1 are respectively connected to one end of the capacitor C4, one end of the capacitor C5 and the VDD end, and the other end of the capacitor C4 and the other end of the capacitor C5 are respectively grounded. The pin 1 of the chip U1 is respectively connected to one end of the capacitor C3, the VDD end, the pin 30 of the chip U1 and the pin 29 of the chip U1, and the other end of the capacitor C3 is grounded. The pin 31 of the chip U1 is connected to one end of the resistor R1, and the other end of the resistor R1 is grounded. The pins 28 of the chip U1 are respectively connected to the resistor R1. One end of capacitor C1 is connected to pin 1 of chip U2, pin 2 of chip U2 is grounded, the other end of capacitor C1 is grounded, pin 4 of chip U2 is grounded, pin 3 of chip U2 is respectively connected to one end of capacitor C2 and pin 27 of chip U1, the other end of capacitor C2 is grounded, pin 18 of chip U1 is connected to pin 7 of chip U3, pin 19 of chip U1 is connected to pin 3 of chip U3, pin 20 of chip U1 is connected to pin 1 of chip U3, pin 21 of chip U1 is connected to pin 6 of chip U3 through resistor R2, pin 22 of chip U1 is connected to pin 2 of chip U3, pin 23 of chip U1 is connected to pin 5 of chip U3, and pin 17 of chip U1 is respectively connected to pin 11 of chip U1 and the VDD end.

4. A transformer online monitoring system according to claim 1, characterized in that: The chip model of the multiplexer switch is AMC4601.

5. The transformer online monitoring system according to claim 1, characterized in that: The storage module uses Micron's 4Gbit DDR3-SDRAM memory chip MT41J256M16HA-125 as a cache medium.

6. A transformer online monitoring system according to claim 1, characterized in that:

6. The power module includes an AVS voltage regulation single path and a core voltage output circuit, and the AVS voltage regulation single path and the core voltage output circuit include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first inductor L1, a chip MP2122, a voltage +5V terminal, a voltage regulation circuit output AVS terminal, and a core voltage output CPU terminal; Among them, the voltage +5V end is respectively connected to one end of the first capacitor C1, one end of the second capacitor C2, the EN1 end of the chip MP2122, and the IN end of the chip MP2122. The other end of the first capacitor C1 and the other end of the second capacitor C2 are connected and grounded. The SW1 end of the chip MP2122 is connected to one end of the first inductor L1. The other end of the first inductor L1 is respectively connected to one end of the first resistor R1, one end of the third capacitor C3, one end of the fourth capacitor C4, and the core voltage output CPU end. The other end of the third capacitor C3 and the other end of the fourth capacitor C4 are connected and grounded. The other end of the first resistor R1 is respectively connected to one end of the third resistor R3, one end of the fourth resistor R4, and one end of the second resistor R2. The other end of the third resistor R3 is grounded. The other end of the fourth resistor R4 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and one end of the fifth capacitor C5. The other end of the fifth resistor R5 is connected to the voltage regulation circuit output AVS end. The other end of the fifth capacitor C5 is grounded. The other end of the second resistor R2 is connected to the FB1 end of the chip MP2122.

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