Monohydrogen on-line monitoring device for ascending flanged base

By designing a single-hydrogen online monitoring device for transformer oil, the problem of unintelligent detection of hydrogen content in transformer oil was solved, achieving high-precision, real-time hydrogen monitoring and supporting the accumulation of theoretical basis for condition-based maintenance.

CN223727746UActive Publication Date: 2025-12-26SHANGHAI RUIKAI ELECTRIC EQUIP CO LTD
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Patent Information

Application Number
CN202520284903.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-21
Publication Date
2025-12-26
Estimated Expiration
2035-02-21

AI Technical Summary

Technical Problem

Current technologies for detecting hydrogen content in transformer oil are not intelligent enough and need improvement.

Method used

A single-hydrogen online monitoring device for a raised seat was designed, including a sensor module, a filtering and amplification module, an AD sampling module, a main control module, and an RS485 serial port module. Combined with a temperature signal acquisition module, high-precision temperature control is achieved through PID and PWM units to ensure the working status of the sensor module.

Benefits of technology

This technology enables real-time, long-term monitoring of hydrogen content in transformer oil, accumulates experience data on condition-based maintenance, provides a theoretical basis for condition-based maintenance, and improves the accuracy and reliability of detection.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an ascending flanged base monohydrogen on-line monitoring device, which relates to the field of electric power, and comprises a sensor module used for outputting a hydrogen signal based on the hydrogen content in oil of a transformer in the environment; the filtering and amplifying module is used for filtering the hydrogen signal and then outputting the filtered hydrogen signal to the AD sampling module; the beneficial effects of the utility model are that by monitoring and judging the hydrogen in the oil of the transformer in real time for a long time, not only can important empirical data be accumulated for state maintenance, but also the hydrogen in the oil of the transformer can be monitored and judged in real time for a long time; meanwhile, a research result can provide a theoretical basis for state maintenance; the PID unit adopts a dual-power operational amplifier LM124 operational amplifier, a proportional circuit, an integral circuit and a differentiating circuit are independently designed, matched PID parameters are obtained by testing the temperature characteristics of the sensitive core, and high-precision temperature control is achieved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the electric power field, concretely is a kind of single hydrogen online monitoring device of elevation seat. BACKGROUND

[0002] Power transformer is one of important equipment in power system, with the development of society, the normal operation of power grid has become the indispensable demand in people's life, thus it can be seen that the requirement of the stability of power grid operation also improves, and the normal operation of transformer is an important link of power grid operation stability, whether reliable and safely normal operation becomes the focus of each manufacturer and power department.Theory and practice have proved that hydrogen is the earliest and most easily produced characteristic gas of discharge (partial discharge, spark, arc) and heat (decomposition) of oil-filled electrical equipment such as transformer. Therefore, hydrogen is also the early signal of fault of oil-filled electrical equipment recognized by the industry (IEEE C57.104 and IEC60599). Monitoring the hydrogen content in the oil of transformer is an effective way to monitor the health status of transformer.

[0003] In the prior art, the hydrogen content in the oil of transformer is often detected manually, which is not intelligent enough and needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a kind of single hydrogen online monitoring device of elevation seat to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of single hydrogen online monitoring device of elevation seat, comprising:

[0007] Sensor module is used to output hydrogen signal based on the hydrogen content in the oil of transformer in environment;

[0008] Filtering and amplifying module is used to output hydrogen signal to AD sampling module after filtering;

[0009] AD sampling module is used to complete the conversion of analog signal to digital signal to the hydrogen signal after filtering and amplifying module, and output to main control module;

[0010] Main control module is used to receive the digital signal output by AD sampling module, and judge the hydrogen content in the oil of transformer;

[0011] RS485 serial port module is used to build the RS485 communication of main control module;

[0012] Sensor module is connected with filtering and amplifying module, filtering and amplifying module is connected with AD sampling module, AD sampling module is connected with main control module, and main control module is connected with RS485 serial port module.

[0013] As a further scheme of the utility model: the elevating seat single hydrogen online monitoring device still includes temperature signal acquisition module, be used for controlling ambient temperature, ensure that sensor module working state;

[0014] Temperature signal acquisition module includes:

[0015] PID unit is used for obtaining matched PID parameter through testing sensor module sensitive core temperature characteristic, and output PID signal;

[0016] PWM unit is used for generating the PWM signal of adjustable pulse width through sawtooth wave and PID signal comparison, and is output to heating unit;

[0017] Heating unit is used for heating adjustment ambient temperature, and matches sensor module sensitive core temperature characteristic;

[0018] PID unit connects PWM unit, and PWM unit connects heating unit.

[0019] As a further scheme of the utility model: PID unit includes amplifier U3A, amplifier U3B, amplifier U3C, amplifier U3D, the same phase end of amplifier U3A is connected with the corresponding signal of sensor module sensitive core temperature characteristic, the opposite phase end of amplifier U3A is connected with one end of resistance R4, one end of resistance R5, the other end of resistance R4 is connected with signal VCC-BAIS, the other end of resistance R5 is connected with the output end of amplifier U3A, one end of resistance R8, one end of resistance R14, the other end of resistance R14 is connected with one end of resistance R20, one end of resistance R22, the other end of resistance R20 is connected with signal VCC-BAIS, the same phase end of amplifier U3D, the other end of resistance R22 is connected with the opposite phase end of amplifier U3D, one end of resistance R15, one end of capacitor C11, the output end of amplifier U3D is connected with the other end of resistance R15, the other end of capacitor C11, one end of resistance R16, the other end of resistance R8 is connected with the opposite phase end of amplifier U3B, one end of resistance R6, the same phase end of amplifier U3B is connected with signal VCC-BAIS, the output end of amplifier U3B is connected with the other end of resistance R6, one end of resistance R10, the other end of resistance R10 is connected with one end of resistance R11, the other end of resistance R16, one end of capacitor C12, the opposite phase end of amplifier U3C, the same phase end of amplifier U3C is connected with signal VCC-BAIS, the output end of amplifier U3C is connected with the other end of resistance R11, the other end of capacitor C12, one end of resistance R18, the other end of resistance R18 is connected with PWM unit.

[0020] As a further scheme of the utility model: PWM unit includes amplifier U4C, amplifier U4B, amplifier U8A, the opposite end of amplifier U4C is connected signal VCC-BAIS, one end of resistance R30, one end of resistance R31 is connected to the same phase end of amplifier U4C, one end of resistance R27 is connected to the output end of amplifier U4C, the other end of resistance R27 is connected to the other end of resistance R30, the negative pole of diode D1, one end of resistance R28, the positive pole of diode D1 is grounded, one end of capacitor C14, the opposite end of amplifier U4B is connected to the other end of resistance R28, the same phase end of amplifier U4B is connected signal VCC-BAIS, the output end of amplifier U4B is connected to the other end of capacitor C14, the other end of resistance R31, the same phase end of amplifier U8A, the opposite end of amplifier U8A is connected PID unit, and the output end of amplifier U8A is connected heating unit.

[0021] As a further scheme of the utility model: heating unit includes triode Q1, chip U5, the model of chip U5 is TPS1101, the base of triode Q1 is connected PWM unit through resistance R24, the collector of triode Q1 is grounded, one end of resistance R19 is connected to the emitter of triode Q1, the other end of resistance R19 is connected to one end of resistance R13, one end of resistance R17, the other end of resistance R13 is connected to 9V voltage, the S pole of chip U1, the other end of resistance R17 is connected to the G pole of chip U1, and the first end of heating equipment PT2 is connected to the D pole of chip U1 through resistance R42.The second end of heating equipment PT2 is grounded.

[0022] Compared with the prior art, the utility model has the advantages that the utility model judges the hydrogen in the oil of the transformer in real time and long term, can not only accumulate important experience data for condition-based maintenance, and the research results can provide a theoretical basis for condition-based maintenance, PID unit adopts double power supply operational amplifier LM124, separately designs proportional circuit, integral circuit and differential circuit, obtains matched PID parameters by testing sensitive core temperature characteristics, and high-precision temperature control is realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a kind of principle diagram of single hydrogen online monitoring device of elevation seat.

[0024] Figure 2 It is the circuit diagram of PID unit.

[0025] Figure 3 It is the circuit diagram of PWM unit.

[0026] Figure 4 It is the circuit diagram of heating unit. DETAILED DESCRIPTION

[0027] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments, and based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0028] Please refer to Figure 1 The application discloses a kind of single hydrogen online monitoring devices of lifting seat, comprising:

[0029] Sensor module is used to output hydrogen signal based on the hydrogen content in the oil of transformer in environment;

[0030] Filtering and amplifying module is used to filter and amplify hydrogen signal and output to AD sampling module;

[0031] AD sampling module is used to complete the conversion from analog signal to digital signal for hydrogen signal after filtering and amplifying module, and output to main control module;

[0032] Main control module is used to receive digital signal output by AD sampling module, and judge the hydrogen content in the oil of transformer;

[0033] RS485 serial port module is used to build RS485 communication of main control module;

[0034] Sensor module is connected with filtering and amplifying module, filtering and amplifying module is connected with AD sampling module, AD sampling module is connected with main control module, and main control module is connected with RS485 serial port module.

[0035] In specific embodiments:

[0036] The hydrogen-sensitive structure mode of Wheatstone full bridge is used in sensor module. The hydrogen-sensitive structure mode of Wheatstone full bridge is used. Four palladium alloy hydrogen-sensitive resistors are used to form the detection element of Wheatstone full bridge, and the difference is that two hydrogen-sensitive resistors are deposited with passivation film to isolate the hydrogen-sensitive resistor from hydrogen. The hydrogen-sensitive detection element of Wheatstone full bridge can double the sensitivity of the sensor.

[0037] The filter amplification module adopts a design of a 500 kHz second-order active high-pass filter circuit and a 30 MHz second-order active low-pass filter circuit connected in series. Here, an ADA4895 rail-to-rail output amplifier of the ADI company is selected in combination with a peripheral resistance design. The small signal bandwidth of the ADA4895-1 / ADA4895-2 is 236 MHz at a gain of +10, the slew rate is 943 V / us, and the 0.1% rise time is 22 ns. The ADA4895-1 / ADA4895-2 has a wide operating voltage range of 3V to 10V, and is extremely suitable for systems that require high gain, high speed, high precision, and large dynamic range.

[0038] The AD sampling module selects the ADI company's AD620.

[0039] The main control module selects the TI's MSP430FR6007. The chip has extremely low power consumption, and is configured with a large number of on-chip peripherals and various resources. The function and performance are not affected by the small power consumption, and are still very powerful.

[0040] The RS485 serial port module adopts the ADM487 chip of the ADI company, which has excellent electrical characteristics and reliability. In the circuit design, although the RS-485 interface adopts a differential transmission mode, it has a certain ability to resist common-mode interference. However, when the common-mode voltage exceeds the limit receiving voltage of the RS-485 receiver, that is, greater than +12V or less than -7V, the receiver cannot work normally, and in severe cases, the chip and instrument equipment can be burned. Therefore, the utility model isolates the power supply of the system and the power supply of the RS-485 transceiver through an optical coupler, and isolates the signal through an isolating device, thereby completely eliminating the influence of the common-mode voltage.

[0041] In the embodiment, the raised seat single hydrogen online monitoring device further comprises a temperature signal acquisition module for controlling the ambient temperature and ensuring the working state of the sensor module.

[0042] The temperature signal acquisition module comprises:

[0043] A PID unit is configured to obtain matching PID parameters by testing the temperature characteristics of the sensitive core of the sensor module, and output a PID signal.

[0044] A PWM unit is configured to generate a PWM signal with adjustable pulse width by comparing a sawtooth wave with the PID signal, and output the PWM signal to the heating unit.

[0045] The heating unit is configured to heat and adjust the ambient temperature, and match the temperature characteristics of the sensitive core of the sensor module.

[0046] The PID unit is connected to the PWM unit, and the PWM unit is connected to the heating unit.

[0047] In the embodiment, please refer toFigure 2 The PID unit includes an amplifier U3A, an amplifier U3B, an amplifier U3C, and an amplifier U3D. The non-inverting terminal of the amplifier U3A is connected to a corresponding signal of the sensor module sensitive to the temperature characteristics of the core. One end of the resistor R4 and one end of the resistor R5 are connected to the inverting terminal of the amplifier U3A. The other end of the resistor R4 is connected to the signal VCC-BAIS, and the other end of the resistor R5 is connected to the output terminal of the amplifier U3A, one end of the resistor R8, and one end of the resistor R14. The other end of the resistor R14 is connected to one end of the resistor R20 and one end of the resistor R22. The other end of the resistor R20 is connected to the signal VCC-BAIS and the non-inverting terminal of the amplifier U3D. The other end of the resistor R22 is connected to the inverting terminal of the amplifier U3D, one end of the resistor R15, and one end of the capacitor C11. The output terminal of the amplifier U3D is connected to the other end of the resistor R15, the other end of the capacitor C11, and one end of the resistor R16. The other end of the resistor R8 is connected to the inverting terminal of the amplifier U3B and one end of the resistor R6. The non-inverting terminal of the amplifier U3B is connected to the signal VCC-BAIS. The output terminal of the amplifier U3B is connected to the other end of the resistor R6 and one end of the resistor R10. The other end of the resistor R10 is connected to one end of the resistor R11, the other end of the resistor R16, one end of the capacitor C12, and the inverting terminal of the amplifier U3C. The non-inverting terminal of the amplifier U3C is connected to the signal VCC-BAIS. The output terminal of the amplifier U3C is connected to the other end of the resistor R11, the other end of the capacitor C12, and one end of the resistor R18. The other end of the resistor R18 is connected to the PWM unit.

[0048] During the hydrogen concentration measurement process, the ambient temperature as an interference physical quantity will affect the accuracy of the sensor. For example, for a palladium alloy hydrogen sensor, when the temperature rises, the response time will be shortened, but the output signal amplitude will be reduced. Conversely, when the temperature decreases, the response time increases, and the output signal amplitude becomes larger. Therefore, in order to obtain accurate hydrogen concentration measurement results, it is necessary to select a suitable sensor operating temperature and reduce the influence of the ambient temperature on the performance of the sensor, so a temperature signal acquisition module is designed.

[0049] The chip U3A and the peripheral circuit output an error signal by testing the temperature characteristics of the sensor module sensitive core.

[0050] The chip U3B and the peripheral circuit constitute a proportional circuit, which generates an output signal proportional to the error according to the current error signal (i.e., the difference between the target temperature and the actual temperature). This helps to quickly reduce the error, but may not completely eliminate the error. In the circuit, the proportional gain is determined by the values of the resistors connected to the input and output terminals of the LM124.

[0051] The chip U3C and the peripheral circuit constitute an integral circuit, which accumulates the past error signal to eliminate the steady-state error in the system. When the error persists, the output of the integral circuit will gradually increase, thereby driving the control signal to change in the direction of reducing the error. The capacitor C12 in the integral circuit is used to store the charge, and its value determines the strength of the integral action.

[0052] The chip U3D and the peripheral circuit constitute a differential circuit, which predicts the future change of the error signal and adjusts the control signal accordingly to reduce the overshoot and oscillation of the system. The differential circuit achieves this by detecting the rate of change of the error signal. In the circuit, the capacitor C11 and the resistors R15 and R16 in the differential circuit are used to implement the differential operation.

[0053] When the temperature changes, the sensitive core of the sensor module will generate a corresponding electrical signal as input to the non-inverting terminal of the amplifier U3A. The amplifier U3A calculates the error signal based on the input signal and the preset target temperature, and generates a PID signal through the processing of the proportional, integral, and differential circuits. The PID signal is used to adjust the power of the heating or cooling element, thereby achieving precise control of the temperature.

[0054] In this embodiment: please refer to Figure 3 , the PWM unit includes the amplifier U4C, the amplifier U4B, and the amplifier U8A. The inverting terminal of the amplifier U4C is connected to the signal VCC-BAIS. The non-inverting terminal of the amplifier U4C is connected to one end of the resistor R30 and one end of the resistor R31. The output terminal of the amplifier U4C is connected to one end of the resistor R27. The other end of the resistor R27 is connected to the other end of the resistor R30, the negative electrode of the diode D1, and one end of the resistor R28. The positive electrode of the diode D1 is grounded. The other end of the resistor R28 is connected to one end of the capacitor C14 and the inverting terminal of the amplifier U4B. The non-inverting terminal of the amplifier U4B is connected to the signal VCC-BAIS. The output terminal of the amplifier U4B is connected to the other end of the capacitor C14, the other end of the resistor R31, and the non-inverting terminal of the amplifier U8A. The inverting terminal of the amplifier U8A is connected to the PID unit. The output terminal of the amplifier U8A is connected to the heating unit.

[0055] A sawtooth wave is formed at the amplifier U8A through the amplifiers U4C and U4B. The non-inverting terminal of the amplifier U8A is the PID signal. The amplifier U8A outputs a PWM signal to the heating unit.

[0056] In this embodiment: please refer to Figure 4The heating unit comprises a triode Q1, a chip U5, the model number of the chip U5 is TPS1101, the base of the triode Q1 is connected with the PWM unit through a resistor R24, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of a resistor R19, the other end of the resistor R19 is connected with one end of a resistor R13 and one end of a resistor R17, the other end of the resistor R13 is connected with a 9V voltage and the S pole of the chip U1, the other end of the resistor R17 is connected with the G pole of the chip U1, the D pole of the chip U1 is connected with the first end of a heating device PT2 through a resistor R42, and the second end of the heating device PT2 is grounded.

[0057] When the PWM signal is at a low level, the triode Q1 is turned on, the voltage of the G pole of the chip U1 is pulled down, the chip U1 is turned on, the chip U1 is turned on, the D pole outputs a voltage, the heating device PT2 is driven to work, and the ambient temperature is adjusted.

[0058] The working principle of the utility model is: sensor module is used for outputting hydrogen signal based on hydrogen content in oil of transformer in environment; filter amplification module is used for outputting hydrogen signal to AD sampling module after filtering; AD sampling module is used for completing conversion from analog signal to digital signal for hydrogen signal after filter amplification module, and outputting to main control module; main control module is used for receiving digital signal output by AD sampling module, and judging hydrogen content in oil of transformer; RS485 serial port module is used for constructing RS485 communication of main control module.

[0059] It is apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments but can be implemented in other forms without departing from the spirit or essential characteristics of the utility model. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive.

[0060] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A raised seat single hydrogen online monitoring device, characterized in that, The raised seat single hydrogen online monitoring device comprises: A sensor module for outputting a hydrogen signal based on the hydrogen content in the oil of the transformer in the environment; A filter amplification module for filtering and outputting the hydrogen signal to an AD sampling module; The AD sampling module is used for converting the hydrogen signal after the filter amplification module into a digital signal and outputting the digital signal to the main control module; The main control module is used for receiving the digital signal output by the AD sampling module and judging the hydrogen content in the oil of the transformer; An RS485 serial port module is used for building RS485 communication of the main control module; The sensor module is connected to the filter amplification module, the filter amplification module is connected to the AD sampling module, the AD sampling module is connected to the main control module, and the main control module is connected to the RS485 serial port module.

2. The elevated seat single hydrogen online monitoring device according to claim 1, characterized in that, The raised seat single hydrogen online monitoring device further comprises a temperature signal acquisition module for controlling the environmental temperature and ensuring the working state of the sensor module; The temperature signal acquisition module comprises: A PID unit for obtaining matched PID parameters by testing the temperature characteristics of the sensitive core of the sensor module and outputting a PID signal; A PWM unit for generating a PWM signal with adjustable pulse width by comparing a sawtooth wave with the PID signal and outputting the PWM signal to a heating unit; The heating unit is used for heating and adjusting the environmental temperature to match the temperature characteristics of the sensitive core of the sensor module; The PID unit is connected to the PWM unit, and the PWM unit is connected to the heating unit.

3. The elevated seat single hydrogen online monitoring device according to claim 2, characterized in that, The PID unit comprises an amplifier U3A, an amplifier U3B, an amplifier U3C, and an amplifier U3D, the noninverting terminal of the amplifier U3A is connected to a corresponding signal of the temperature characteristics of the sensitive core of the sensor module, the inverting terminal of the amplifier U3A is connected to one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected to a signal VCC-BAIS, the other end of the resistor R5 is connected to the output terminal of the amplifier U3A, one end of a resistor R8, and one end of a resistor R14, the other end of the resistor R14 is connected to one end of a resistor R20 and one end of a resistor R22, the other end of the resistor R20 is connected to the signal VCC-BAIS and the noninverting terminal of the amplifier U3D, the other end of the resistor R22 is connected to the inverting terminal of the amplifier U3D, one end of a resistor R15, and one end of a capacitor C11, the output terminal of the amplifier U3D is connected to the other end of the resistor R15, the other end of the capacitor C11, and one end of a resistor R16, the other end of the resistor R8 is connected to the inverting terminal of the amplifier U3B and one end of a resistor R6, the noninverting terminal of the amplifier U3B is connected to the signal VCC-BAIS, the output terminal of the amplifier U3B is connected to the other end of the resistor R6 and one end of a resistor R10, the other end of the resistor R10 is connected to one end of a resistor R11, the other end of the resistor R16, one end of a capacitor C12, and the inverting terminal of an amplifier U3C, the noninverting terminal of the amplifier U3C is connected to the signal VCC-BAIS, and the output terminal of the amplifier U3C is connected to the other end of the resistor R11, the other end of the capacitor C12, and one end of a resistor R18, the other end of the resistor R18 is connected to the PWM unit.

4. The elevated seat single hydrogen online monitoring device according to claim 2, characterized in that, The PWM unit comprises an amplifier U4C, an amplifier U4B, an amplifier U8A, an inverting terminal of the amplifier U4C connected with a signal VCC-BAIS, one end of a resistor R30 and one end of a resistor R31 connected with a non-inverting terminal of the amplifier U4C, one end of a resistor R27 connected with an output terminal of the amplifier U4C, the other end of the resistor R27 connected with the other end of the resistor R30, a negative electrode of a diode D1, one end of a resistor R28 connected with the other end of the diode D1, a positive electrode of the diode D1 grounded, the other end of the resistor R28 connected with one end of a capacitor C14 and an inverting terminal of the amplifier U4B, a non-inverting terminal of the amplifier U4B connected with the signal VCC-BAIS, the output terminal of the amplifier U4B connected with the other end of the capacitor C14, the other end of the resistor R31 and a non-inverting terminal of the amplifier U8A, an inverting terminal of the amplifier U8A connected with the PID unit, and an output terminal of the amplifier U8A connected with the heating unit.

5. The elevated seat single hydrogen online monitoring device according to claim 2, characterized in that, The heating unit comprises a triode Q1 and a chip U5, the chip U5 is a TPS1101, a base of the triode Q1 connected with the PWM unit through a resistor R24, a collector of the triode Q1 grounded, an emitter of the triode Q1 connected with one end of a resistor R19, the other end of the resistor R19 connected with one end of a resistor R13 and one end of a resistor R17, the other end of the resistor R13 connected with a 9V voltage and an S pole of a chip U1, the other end of the resistor R17 connected with a G pole of the chip U1, a D pole of the chip U1 connected with a first end of a heating device PT2 through a resistor R42, and a second end of the heating device PT2 grounded.