CN210465261U - Real-time online detection device for dissolved oxygen content of insulating oil - Google Patents
Real-time online detection device for dissolved oxygen content of insulating oil Download PDFInfo
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Abstract
The utility model provides a real-time online detection device for the dissolved oxygen content of insulating oil, which comprises an oil sample sampling loop, an oil sample measuring tank, a data acquisition and processing unit and a transition oil tank; the sampling end of the oil sample sampling loop is connected with an oil taking flange plate connecting oil pipe of the oil immersion equipment, and the oil discharging end of the oil sample sampling loop is connected with an oil returning flange plate connecting oil pipe of the oil immersion equipment; the oil sample sampling loop comprises an oil inlet electromagnetic valve, an oil discharge electromagnetic valve and a circulating oil pump, wherein the oil inlet electromagnetic valve, the oil discharge electromagnetic valve and the circulating oil pump are sequentially connected through an oil pipe; the oil sample measuring pool is arranged on the oil sample sampling loop, a dissolved oxygen sensor is arranged in the oil sample measuring pool, the dissolved oxygen sensor is used for measuring the content of dissolved oxygen in the insulating oil and transmitting the measured data to the acquisition and processing unit for connection, and the dissolved oxygen sensor is powered by a sensor power supply; the transition oil tank is arranged between the oil inlet electromagnetic valve and the oil discharge electromagnetic valve. The utility model discloses simple structure, convenient to use, measurement accuracy height.
Description
Technical Field
The utility model relates to a detection apparatus in oil-immersed power equipment on-line monitoring device field, in particular to real-time on-line detection device of insulating oil dissolved oxygen content.
Background
The online monitoring device for the components of the dissolved gas in the transformer oil at the present stage is widely popularized and applied, the real state of the internal insulation of the transformer equipment is grasped in time through the real-time detection of the dissolved gas in the insulation of the oil-immersed high-voltage power transmission and transformation equipment in operation on site, and the hidden fault trouble in the transformer is discovered as early as possible. The traditional oil chromatography on-line monitoring product mainly aims at the components of dissolved hydrocarbon gas, such as methane, ethane, ethylene and acetylene, hydrogen, carbon monoxide and carbon dioxide, in insulating oil to carry out on-line detection; in recent years, products for online monitoring of all components of dissolved gas in insulating oil appear, in addition to online detection of dissolved characteristic gas components in insulating oil, online detection of oxygen and nitrogen components and micro-water dissolved in insulating oil is performed at the same time.
The conventional means for detecting the oxygen dissolved in the insulating oil is to separate the oxygen component dissolved in the insulating oil through different degassing modes, detect the oxygen component by using a sensor to obtain the content of the oxygen component in the total gas removed from the insulating oil, and then deduce the content of the oxygen component in the insulating oil through the solution balance calculation formulas of the different degassing modes. Different degassing modes are influenced by various factors such as temperature, pressure, oil product types and the like in the process of separating oxygen from oil, a formula for calculating the oxygen concentration in the insulating oil from the oxygen concentration in a gas phase is established on the theory of gas-liquid distribution and dissolution balance, the distribution coefficient generally refers to a classical value, and the distribution coefficient of the oxygen in the oil has certain difference according to different conditions and different oil products; the response of the oxygen sensor in the gas phase is often interfered by other components, and errors are brought in many links, so that a large error exists between the calculated content of dissolved oxygen in the insulating oil and the real content inevitably. Oxygen sensor is mostly consumption type principle, and oxygen needs to participate in the reaction, and the gaseous total amount that needs during the measurement is many, and the oil mass that corresponds also needs more, and the corresponding functional unit of on-the-spot on-line monitoring equipment is bulky, the extraction oil appearance is many.
The search of the prior art shows that Chinese patent document No. CN 106370746A, published 2017-02-01, discloses an analyzer and a detection method technology for dissolved gas in vegetable insulating oil with an oil-gas separation function, and discloses an analyzer and a detection method for trace dissolved gas in vegetable insulating oil with an oil-gas separation function. The method is characterized in that: helium is used as carrier gas, and the ten-component gas in the vegetable insulating oil is analyzed by utilizing the technology of vacuum degassing and micro thermal conductivity chromatograph combination: hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethylene, ethane, propane, acetylene. A four-chromatographic-column separation system is adopted, a valve is utilized for column switching, circulating gas is adopted for sample injection by an air pump, while a sample completely enters the A chromatographic column at one time, the B and D chromatographic columns are connected to the tail end of the A chromatographic column in series, and after hydrogen, oxygen, nitrogen, methane and carbon monoxide come out, the ten-way valve switches the original state. Carbon dioxide, ethylene, acetylene, ethane and propane firstly peak at the channel A of the thermal conductivity detector. Hydrogen, oxygen, nitrogen, carbon monoxide, methane peak in the B channel of the thermal conductivity detector. The instrument has high sensitivity to each gas, and is suitable for popularization and use in a smart power grid. The device and the method belong to laboratory analysis equipment and method, and the requirement of on-site implementation on-line detection is difficult to meet.
Chinese patent document No. CN108647783A, published as 2018-10-12, discloses a method for detecting dissolved oxygen in aquaculture water, and the utility model provides a method for detecting dissolved oxygen in aquaculture water, belonging to the field of aquaculture. The method comprises the steps of taking data collected historically as a data set, establishing an artificial intelligence model for detecting dissolved oxygen values based on a BP neural network, and calculating the dissolved oxygen values according to temperature, turbidity, pH value and data collection time under the condition that dissolved oxygen is measured without using a dissolved oxygen sensor after the neural network is trained. Because dissolved oxygen detects sensor's expensive, maintenance cycle is short, and debris absorption etc. can cause the reading deviation great in the water, the utility model discloses according to multivariable correlation and data fusion, use the neural network model, do not rely on the dissolved oxygen sensor in the detection of actual dissolved oxygen, practiced thrift the cost, can solve the inaccurate problem of dissolved oxygen reading that debris absorption caused simultaneously. The method can meet the technical requirement of online detection of dissolved oxygen in insulating oil.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a real-time on-line measuring device of insulating oil dissolved oxygen content that simple structure, convenient to use, measurement accuracy are high.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
insulating oil dissolved oxygen content real-time on-line measuring device, detection device includes:
the sampling end of the oil sample sampling loop is connected with an oil taking flange plate connecting oil pipe of the oil immersion equipment, and the oil discharging end of the oil sample sampling loop is connected with an oil returning flange plate connecting oil pipe of the oil immersion equipment; the oil sample sampling loop is used for sampling an insulating oil sample to be detected into the oil sample measuring pool at a constant flow rate, and simultaneously completely discharging the oil sample detected last time in the oil sample measuring pool; the oil sample sampling loop comprises an oil inlet electromagnetic valve, an oil discharge electromagnetic valve and a circulating oil pump, wherein the oil inlet electromagnetic valve, the oil discharge electromagnetic valve and the circulating oil pump are sequentially connected through an oil pipe;
the oil sample measuring tank is arranged on the oil sample sampling loop and used for storing insulating oil to be measured, a dissolved oxygen sensor is arranged in the oil sample measuring tank and used for measuring the content of dissolved oxygen in the insulating oil and transmitting the measured data to the acquisition and processing unit for connection, and the dissolved oxygen sensor is powered by a sensor power supply;
the data acquisition and processing unit is used for receiving the data transmitted by the dissolved oxygen sensor;
and the transition oil tank is arranged between the oil inlet electromagnetic valve and the oil discharge electromagnetic valve.
In one embodiment of the present invention, the dissolved oxygen sensor comprises a photoelectric module, an oxygen exchange cap, a temperature compensation module, a pressure compensation module, and a sensor signal processing circuit;
in an embodiment of the present invention, the optoelectronic module is used for detecting the change of the light intensity emitted from the oxygen exchange cap and transmitting the detection signal to the sensor signal processing circuit, and the optoelectronic module is composed of an electronic board, a LED, an optical filter, a sensor probe and a signal adjusting circuit which are connected in sequence.
In one embodiment of the present invention, the oxygen exchange cap is used for selectively permeating dissolved oxygen in the insulating oil and generating an optical signal; the oxygen exchange cap consists of a protective layer, an oxygen sensor film and an optical coating which are sequentially arranged from outside to inside; the protective layer is used for protecting the dissolved oxygen sensor from being in direct contact with insulating oil in oil-immersed power equipment in operation, and the oxygen sensor film and the optical coating are used for protecting the internal photoelectric module from being in contact with interference oxygen response substances in a test environment.
In an embodiment of the present invention, the temperature compensation module is used for measuring the real-time operating temperature of the insulating oil contacted with the dissolved oxygen sensor in real time, and the temperature compensation module is composed of a temperature sensor, a temperature conversion circuit, an automatic temperature compensation circuit, a calibration circuit, a rectification, filtering and amplification circuit and a voltage-current conversion circuit; the output end of the temperature conversion circuit is connected with the automatic temperature compensation circuit to transmit a temperature voltage signal; the output end of the automatic temperature compensation circuit is connected with the input end of the calibration circuit to transmit compensation signals, and the output end of the calibration circuit and the output end of the rectification filtering amplification circuit are both connected with the voltage-current conversion circuit and are finally connected to the sensor signal processing circuit to transmit calibrated dissolved oxygen content signals.
In an embodiment of the present invention, the pressure compensation module is used for measuring the real-time working oil pressure of the insulating oil contacted by the dissolved oxygen sensor in real time, and the pressure compensation module is composed of a pressure sensor, a pressure conversion circuit, an automatic pressure compensation circuit, a calibration circuit, a rectification filtering amplification circuit and a voltage-current conversion circuit; the output end of the pressure conversion circuit is connected with the automatic pressure compensation circuit to transmit pressure voltage signals, the output end of the automatic compensation circuit is connected with the input end of the calibration circuit to transmit compensation signals, and the output end of the calibration circuit and the output end of the rectification filtering amplification circuit are both connected with the voltage current conversion circuit and are finally connected to the sensor signal processing circuit to transmit calibrated dissolved oxygen content signals.
The utility model discloses an in the embodiment, be equipped with RS485 on the data acquisition and processing unit as digital interface, upload to host computer or other platforms with final dissolved oxygen value through RS485 digital interface.
Through the technical scheme, the beneficial effects of the utility model are that:
the utility model discloses simple structure, convenient to use adopts dissolved oxygen direct measurement method in the insulating oil, and automatic temperature and pressure compensation measure dissolved oxygen sensor operational environment's temperature and pressure to carry out the compensation of temperature, pressure through automatic temperature, pressure compensation circuit, reduce the error of dissolved oxygen content, improve measurement accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the dissolved oxygen sensor of the present invention;
fig. 3 is a schematic structural view of the photovoltaic module of the present invention;
FIG. 4 is a schematic structural view of the oxygen exchange cap of the present invention;
10. the oil sampling device comprises an oil taking flange plate 11, a sampling end 20, an oil return flange plate 21, an oil discharge end 30, an oil inlet electromagnetic valve 40, an oil discharge electromagnetic valve 50, a circulating oil pump 60, an oil pipe 70, an oil sample measuring pool 80, a dissolved oxygen sensor 81, a photoelectric module 81a, an electronic board 81b, an LED81 c, an optical filter 81d, a sensor probe 81e, a signal adjusting circuit 82, an oxygen exchange cap 82a, a protective layer 82b, an oxygen sensor film 82c, an optical coating 83, a temperature compensation module 84, a pressure compensation module 85, a sensor signal processing circuit 90, a data acquisition and processing unit 100, a transition oil tank 110 and a sensor power supply.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
Referring to fig. 1 to 4, the utility model discloses a real-time online detection device for the dissolved oxygen content in insulating oil, which comprises an oil sample sampling loop, an oil sample measuring tank 70, a data acquisition and processing unit 90 and a transition oil tank 100;
the sampling end 11 of the oil sample sampling loop is connected with an oil pipe connected with an oil taking flange plate 10 of the oil immersion equipment, and the oil discharging end 21 of the oil sample sampling loop is connected with an oil pipe connected with an oil return flange plate 20 of the oil immersion equipment; the oil sample sampling loop is used for sampling an insulating oil sample to be detected into the oil sample measuring pool 70 at a constant flow rate, and completely discharging the last detected oil sample in the oil sample measuring pool 70; oil appearance sample return circuit includes oil feed solenoid valve 30, oil extraction solenoid valve 40 and circulating oil pump 50, and oil feed solenoid valve 30, oil extraction solenoid valve 40, circulating oil pump 50 connect gradually through oil pipe 60, and oil feed solenoid valve 30 sets up at the sample end 11 of oil appearance sample return circuit, and circulating oil pump 50 sets up at the oil extraction end 21 of oil appearance sample return circuit.
The oil sample measuring tank 70 is arranged on the oil sample sampling loop, the oil sample measuring tank 70 is used for storing insulating oil to be measured, a dissolved oxygen sensor 80 is arranged in the oil sample measuring tank 70, the dissolved oxygen sensor 80 is used for measuring the content of dissolved oxygen in the insulating oil and transmitting the measured data to the data acquisition and processing unit 90 for connection, and the dissolved oxygen sensor 80 is powered by the sensor power supply 110.
The data acquisition and processing unit 90 is used for receiving the data transmitted by the dissolved oxygen sensor 80, the data acquisition and processing unit 90 is provided with an RS485 as a digital interface, and the final dissolved oxygen value is uploaded to a host or other platforms through the RS485 digital interface.
The transition oil tank 100 is disposed between the oil inlet solenoid valve 30 and the oil discharge solenoid valve 40.
The utility model discloses during the dissolved oxygen content in the measurement insulating oil, the power supply of sensor power 110, open oil extraction battery valve 40, start circulating oil pump 50, the oil appearance that will remain in the oil tank 100 of will passing through is discharged through oil return ring flange 20 completely, close oil extraction battery valve 40, new oil appearance that will await measuring inhales in oil appearance measuring cell 70 and the transition oil tank 100, dissolved oxygen sensor 80 detects dissolved oxygen in the insulating oil simultaneously, dissolved oxygen data upload the oxygen content value after handling to data acquisition and processing unit 90 through RS485, finally dissolved oxygen value uses RS485 to upload to host computer or other platforms as digital interface.
The dissolved oxygen sensor 80 is composed of a photoelectric module 81, an oxygen exchange cap 82, a temperature compensation module 83, a pressure compensation module 84 and a sensor signal processing circuit 85, and a sensing signal of the dissolved oxygen sensor 80 is a signal subjected to temperature and pressure compensation.
The photoelectric module 81 is used for detecting the change of the light intensity emitted by the oxygen exchange cap and transmitting the detection signal to the sensor signal processing circuit 85, and the photoelectric module 81 is composed of an electronic board 81a, an LED81b, an optical filter 81c, a sensor probe 81d and a signal adjusting circuit 81e which are connected in sequence; the optical element LED81b and the optical filter 81c provide modulated optical signals, and the sensor probe 81d is connected to receive optical pulse signals, optically filter, detect, and forward to the signal conditioning circuit 81e for further processing; during detection, light emitted by an optical element LED81b in the photoelectric module 81 is processed by an optical filter 81c, and is radiated onto an optical coating 82c coated on an oxygen exchange cap 82 to generate different light emission, oxygen in insulating oil penetrates through the oxygen exchange cap 82 to change the intensity of the light emission, the change has a certain linear relation with the oxygen concentration, and the oxygen content in a gas phase and the oxygen in a sample are in dynamic balance; the sensor probe 81d (photodiode) and the electronic board 81a constitute a measuring system for detecting the change of the intensity of light emitted from the oxygen exchange cap 82, and the detection signal is transmitted to the sensor signal processing circuit 85.
The oxygen exchange cap 82 is used for selectively permeating oxygen dissolved in the insulating oil and generating an optical signal; the oxygen exchange cap consists of a protective layer 82a, an oxygen sensor membrane 82b and an optical coating 82c which are arranged from outside to inside in sequence, the protective layer is made by coating 2, 2-difluoromethyl-4, 5-difluoro-1, 3-dioxole/tetrafluoroethylene polymer on an expanded polytetrafluoroethylene membrane, and the expanded polytetrafluoroethylene is an ePTFE membrane, a Teflon membrane or a PTFE membrane; the optical coating is a mixture of ruthenium metal chelate and a precursor: the ruthenium metal chelate is 4, 7 diphenyl-1 or 10-phenanthroline ruthenium, and the precursor is polydimethylsiloxane; the protective layer 82a is used for protecting the dissolved oxygen sensor 82 from being in direct contact with insulating oil in oil-immersed power equipment in operation, and preventing the corrosion and the influence of the insulating oil and other chemical substances in the oil on the precision sensing module; the oxygen sensor film 82b and the optical coating 82c are used for protecting the internal photoelectric module 81 from contacting with interfering oxygen response substances in the test environment, and simultaneously enabling dissolved oxygen in the insulating oil to permeate into the photoelectric module 81 of the dissolved oxygen sensor 80 from the insulating oil through the oxygen sensor film 82 b; during detection, the oxygen exchange cap 82 is completely immersed in an oil sample, the protective layer 82a of the oxygen exchange cap 82 contacts the oil sample, and the protective layer 82a has excellent mechanical stability and air permeability and has the function of resisting corrosion of insulating oil; the optical coating 82c in the oxygen exchange cap 82 is coated on the oxygen sensor film 82b and integrated with the protective layer 82a, and the oxygen sensor film 82b and the optical coating 82c have strong physical robustness, fast and good response characteristics to oxygen, high luminous efficiency, impermeability to other ions and other components, and protect the internal photovoltaic module 81 from contact with interfering oxygen response substances in the test environment.
The temperature compensation module 83 is used for measuring the real-time working temperature of the insulating oil contacted with the dissolved oxygen sensor 80 in real time, and the temperature compensation module 83 consists of a temperature sensor, a temperature conversion circuit, an automatic temperature compensation circuit, a calibration circuit, a rectification filtering amplification circuit and a voltage-current conversion circuit (not shown in the figure); the output end of the temperature conversion circuit is connected with the automatic temperature compensation circuit to transmit a temperature voltage signal; the output end of the automatic temperature compensation circuit is connected with the input end of the calibration circuit to transmit compensation signals, and the output end of the calibration circuit and the output end of the rectification filtering amplification circuit are both connected with the voltage-current conversion circuit and are finally connected to the sensor signal processing circuit 85 to transmit calibrated dissolved oxygen content signals.
The pressure compensation module 84 is used for measuring the real-time working pressure of the insulating oil contacted with the dissolved oxygen sensor in real time, and consists of a pressure sensor, a pressure conversion circuit, an automatic pressure compensation circuit, a calibration circuit, a rectification filtering amplification circuit and a voltage-current conversion circuit (not shown in the figure); the output end of the pressure conversion circuit is connected with the automatic pressure compensation circuit to transmit pressure voltage signals, the output end of the automatic compensation circuit is connected with the input end of the calibration circuit to transmit compensation signals, the output end of the calibration circuit and the output end of the rectification filtering amplification circuit are both connected with the voltage current conversion circuit and are finally connected to the sensor signal processing circuit 85 to transmit calibrated dissolved oxygen content signals.
The three groups of signals (optical, temperature and pressure) are sent to a sensor signal processing circuit for calculation, compensation and calibration processing, and the value of the dissolved oxygen in the final insulating oil is output.
The sensing signal of the dissolved oxygen sensor is a voltage signal of 0-90 mV; the temperature voltage signal is a voltage signal of 0-1000 mV; the pressure voltage signal is a voltage signal of 0-1000 mV; the compensation signal is a voltage signal of 0-1000 mV; the output end of the voltage-current conversion circuit outputs a current signal of 4-20 mA.
The utility model discloses a chemistry optics dissolves oxygen sensing and detection technique, designs insulating oil and dissolves oxygen detection device, can carry out the real-time detection of dissolved oxygen in the insulating oil automatically fast to carry out pressure, temperature compensation, the content of oxygen in the accurate calculation insulating oil according to the state of insulating oil, thereby realize that oil-immersed main transformer equipment operation in-process dissolved oxygen real-time supervision and historical data analysis.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. Insulating oil dissolved oxygen content real-time on-line measuring device, its characterized in that, detection device includes:
the sampling end of the oil sample sampling loop is connected with an oil taking flange plate connecting oil pipe of the oil immersion equipment, and the oil discharging end of the oil sample sampling loop is connected with an oil returning flange plate connecting oil pipe of the oil immersion equipment; the oil sample sampling loop is used for sampling an insulating oil sample to be detected into the oil sample measuring pool at a constant flow rate, and simultaneously completely discharging the oil sample detected last time in the oil sample measuring pool; the oil sample sampling loop comprises an oil inlet electromagnetic valve, an oil discharge electromagnetic valve and a circulating oil pump, wherein the oil inlet electromagnetic valve, the oil discharge electromagnetic valve and the circulating oil pump are sequentially connected through an oil pipe;
the oil sample measuring tank is arranged on the oil sample sampling loop and used for storing insulating oil to be measured, a dissolved oxygen sensor is arranged in the oil sample measuring tank and used for measuring the content of dissolved oxygen in the insulating oil and transmitting the measured data to the acquisition and processing unit for connection, and the dissolved oxygen sensor is powered by a sensor power supply;
the data acquisition and processing unit is used for receiving the data transmitted by the dissolved oxygen sensor;
and the transition oil tank is arranged between the oil inlet electromagnetic valve and the oil discharge electromagnetic valve.
2. The real-time online detection device for the content of dissolved oxygen in insulating oil according to claim 1, wherein the dissolved oxygen sensor is composed of a photoelectric module, an oxygen exchange cap, a temperature compensation module, a pressure compensation module and a sensor signal processing circuit.
3. The real-time online detection device for the content of dissolved oxygen in insulating oil according to claim 2, wherein the photoelectric module is used for detecting the change of the light intensity emitted by the oxygen exchange cap and transmitting the detection signal to the sensor signal processing circuit, and the photoelectric module comprises an electronic board, an LED, an optical filter, a sensor probe and a signal adjusting circuit which are connected in sequence.
4. The real-time online detection device for the dissolved oxygen content in the insulating oil as claimed in claim 2, wherein the oxygen exchange cap is used for selectively penetrating the dissolved oxygen in the insulating oil and generating an optical signal; the oxygen exchange cap consists of a protective layer, an oxygen sensor film and an optical coating which are sequentially arranged from outside to inside; the protective layer is used for protecting the dissolved oxygen sensor from being in direct contact with insulating oil in oil-immersed power equipment in operation, and the oxygen sensor film and the optical coating are used for protecting the internal photoelectric module from being in contact with interference oxygen response substances in a test environment.
5. The real-time online detection device for the content of dissolved oxygen in insulating oil according to claim 2, wherein the temperature compensation module is used for measuring the real-time working temperature of the insulating oil contacted with the dissolved oxygen sensor in real time, and the temperature compensation module comprises a temperature sensor, a temperature conversion circuit, an automatic temperature compensation circuit, a calibration circuit, a rectification, filtering and amplification circuit and a voltage-current conversion circuit; the output end of the temperature conversion circuit is connected with the automatic temperature compensation circuit to transmit a temperature voltage signal; the output end of the automatic temperature compensation circuit is connected with the input end of the calibration circuit to transmit compensation signals, and the output end of the calibration circuit and the output end of the rectification filtering amplification circuit are both connected with the voltage-current conversion circuit and are finally connected to the sensor signal processing circuit to transmit calibrated dissolved oxygen content signals.
6. The real-time online detection device for the content of dissolved oxygen in insulating oil according to claim 2, wherein the pressure compensation module is used for measuring the real-time working oil pressure of the insulating oil contacted with the dissolved oxygen sensor in real time, and the pressure compensation module comprises a pressure sensor, a pressure conversion circuit, an automatic pressure compensation circuit, a calibration circuit, a rectification filter amplification circuit and a voltage-current conversion circuit; the output end of the pressure conversion circuit is connected with the automatic pressure compensation circuit to transmit pressure voltage signals, the output end of the automatic compensation circuit is connected with the input end of the calibration circuit to transmit compensation signals, and the output end of the calibration circuit and the output end of the rectification filtering amplification circuit are both connected with the voltage current conversion circuit and are finally connected to the sensor signal processing circuit to transmit calibrated dissolved oxygen content signals.
7. The real-time online detection device for the dissolved oxygen content in insulating oil according to claim 1, wherein the data acquisition and processing unit is provided with an RS485 as a digital interface, and the final dissolved oxygen value is uploaded to a host or other platforms through the RS485 digital interface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109916885A (en) * | 2019-03-26 | 2019-06-21 | 思源电气股份有限公司 | Insulating oil dissolved oxygen content real time on-line detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916885A (en) * | 2019-03-26 | 2019-06-21 | 思源电气股份有限公司 | Insulating oil dissolved oxygen content real time on-line detection device |
| CN109916885B (en) * | 2019-03-26 | 2024-04-26 | 上海思源光电有限公司 | Real-time online detection device for content of dissolved oxygen in insulating oil |
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Effective date of registration: 20201020 Address after: 201108 building 3 and 4, No. 4399, Jindu Road, Minhang District, Shanghai Patentee after: SHANGHAI SIYUAN PHOTOELECTRIC Co.,Ltd. Address before: 201108, No. 4399 Jin Du Road, Shanghai, Minhang District Patentee before: SIEYUAN ELECTRICAL Co.,Ltd. |
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