CN102252712A - Quality monitoring system of high-voltage transmission and transformation transformer insulating oil - Google Patents
Quality monitoring system of high-voltage transmission and transformation transformer insulating oil Download PDFInfo
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- CN102252712A CN102252712A CN2011100913849A CN201110091384A CN102252712A CN 102252712 A CN102252712 A CN 102252712A CN 2011100913849 A CN2011100913849 A CN 2011100913849A CN 201110091384 A CN201110091384 A CN 201110091384A CN 102252712 A CN102252712 A CN 102252712A
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Abstract
The invention discloses a quality monitoring system of the transmission and transformation transformer insulating oil. The system uses easier, and more sensitive and reliable sensors and a sensor system structure; the system can monitor the gas; and more importantly, the system uses the sensors to monitor the comprehensive effect of the physical and chemical parameters of the cracked oil sample under different conditions. The system can be used to transmit the data of the monitoring system to a control center in a wired or wireless mode and can be used for the active preventive maintenance of the smart grid.
Description
Technical field
The present invention relates to a kind of sensor and sensing system of monitoring liquid state.The liquid of the present invention's monitoring comprises transformer insulation oil, engine oil, transmission oil, hydraulic transmission oil and edible oil.Especially, the present invention also can be applied to the data of monitoring system are transferred to Data Control Center in wired or wireless mode, also can be applied to the active preventive maintenance of intelligent grid.
Background technology
The power transmission and transformation transformer generates gas, organic acid and water because the molecule that electric arc that high pressure causes and spark make transformer insulation oil produces cracking.Water and acid are that oil continues oxidized catalyzer, and the formation of water and acid also causes the rising of the conductivity of oil, thereby can not play the effect of insulation.
At present, the monitoring method of a variety of transformer insulated oil quality is arranged, still, the employed monitoring technology of these monitoring methods is also unreliable.Because the employed monitoring technology majority of existing these monitoring methods is the detection to the insulation oil dissolved gas, realize just must periodically on-the-spot oil sample being collected the laboratory and analyzing and detect to the detection of insulation oil dissolved gas.And each the detection all must be through the such process of oil sample collection in worksite one oil sample transportation-gas-oil separation-stratographic analysis.In oil sample collection in worksite process and long-distance transportation in breadboard process, in the air that can't avoid making the minimum gas that is dissolved in the oil sample escape into the oil sample external world, perhaps can't avoid making in the oil sample collection in worksite process gas in the oil sample outside air or impurity to enter into the oil sample of being gathered.So, will reduce the reliability that data or result are detected in the laboratory, final detection result is existed than mistake, increased the possibility that fault is failed to report or reported by mistake, the fault type and the order of severity thereof of judging oil-filled equipment inside made a big impact, caused great blindness, strengthened unnecessary maintenance cost to maintenance work, thereby also make valuablely, the transformer of high value and power transmission and transformation system are among the uncertain danger.Also have, these above-mentioned monitoring methods can not be used for the on-line monitoring and the data transmission of transformer insulation oil mass change.Above-mentioned these problems and a difficult problem are perplexing China's power transmission and transformation industry always, become the difficult point of current China power transmission and transformation industry transformer insulation oil quality monitoring, especially become difficult point and technical bottleneck that China's power transmission and transformation network operation and intelligent grid are built, and, up to now, good solution is still failed to propose in this field.
Summary of the invention
In order to overcome the existing deficiency of the employed monitoring technology of above-mentioned monitoring method, the invention provides the monitoring system of the transformer insulated oil quality of a kind of power transmission and transformation.The present invention proposes to use simpler, sensitivity, reliable sensors and sensing system structure.The present invention not only uses the monitoring to gas, and the present invention is main to be to use sensor that the physics of the oil sample of fissioning under the various conditions, the comprehensive effect of chemical parameters are monitored.
The technical solution adopted for the present invention to solve the technical problems is:
In the present invention, sensor at be not only the detection of gas, more be to acid, water and in order to improve the detection of the material that acid and water detection sensitivity are added.These materials that are added can be in the scope of sensor surface or sensor monitors.These materials that are added can be to run into acid, produce the organic or dead matter of various physics, chemistry, biochemical marker/mark behind the water.These materials comprise metal, oxide, photoactive substance, readily oxidizable substance, hydrophilic substance.These materials run into the variation that can produce physics and chemistry after water or the acid.Variation such as the erosion on the expansion of physical form and volume, surface, change in color, specific inductive capacity.
Among the present invention, sensor monitoring system can comprise following one or more sensor technologies of mentioning, also can comprise some improved gas sensors.
The electric field intensity monitoring sensor
High-tension transformer can produce the variation of very strong electric field intensity and electric field intensity gradient, when particularly producing electrical discharge arc and spark.This is one of major reason that causes the oil-breaking of transformer built-in electrical insulation.Monitoring to these parameters helps prophylactically protecting transformer or changes insulating oil.
The sensor of monitoring electric field intensity and electric field intensity gradient has a variety of.See Fig. 1 and Fig. 2.Electric wave signal that reflection electric field intensity and electric field intensity gradient change among Fig. 1 or electric field signal are received by photoelectric crystal and dielectric mirror, and the phase differential of generation or phase shift contain the information that electric field intensity changes exactly.Fig. 2 is the signal processing circuit of Fig. 1.
It can be a photoelectric crystal type sensor, also can be Metal-oxide-semicondutor field effect cast, also can be the photoelectron effect sensor.
Below list several these type of sensors.
The instrument of quartz crystal electronic monitoring quality
This class sensor is very sensitive to the variation of small quality, even can monitor the cancer single cell.In the monitoring of transformer insulation oil, we adopt an electrode is material for the oxidation extreme sensitivity.When acid and water occurring in the oil, electrode surface can produce reaction, thereby makes electrode quality increase (oxide is attached to electrode surface) or minimizing (corrode, oxide breaks away from electrode surface), sees Fig. 3.Measuring the surface of the electrode, particularly electrode of side among Fig. 3, according to application need, can be metal, semiconductor, insulator, organic substance or biological substance.Electrode surface can be Zn in this is used, Fe, Ni, Cr metal.Fig. 4 is the equivalent electrical circuit of Fig. 3 sensor.
Viscosity sensor
When the insulating oil in the transformer was fissioned, the acid of generation, the gentle cognition of water caused the variation of viscosity.Viscosity sensor can be used electronic type, perhaps mechanical type.The measured parameter of this sensor comprises viscosity, temperature, specific inductive capacity and density.The method needs temperature sensor compensation, the compensation of the sensor reference chamber method of being mentioned below perhaps needing.
The optical color sensor
The decline of insulating oil quality can cause the insulating oil change in color, and this variation can be by the optical color sensor monitors.The work color gamut of optical color sensor comprise visible light, ultraviolet, near infrared, in infrared and far infrared.
Use the optical color sensor that adds material
A large amount of adjuvants that use can produce great significant change color in some biochemical tests in acid that runs into trace or water, and this can be monitored by optical sensor.
The spectrum monitoring sensor
The optical color sensor that material is added in above-mentioned optical color sensor and use can be a spectroscopic detector.The reaction of spectrum or absorption peak can be ultraviolet, visible light or infra-red range.
The capacitor-type sensor
Capacitance type sensor can be used to monitor the mass change of transformer insulation oil.Because it is very high that the monitoring sensitivity of transformer insulation oil requires, the change in dielectric constant of only monitoring insulating oil is not enough, the general material that uses for acid and water sensitive of the electrode of such capacitor.In the time of the insulating oil mass change, the node constant that the capacitor-type sensor is not only monitored insulating oil changes, and the oxidation meeting of electrode for capacitors causes the bigger variation of condenser capacitance numerical value, thereby improves the sensitivity of capacitor-type sensor.
So the electrode of capacitor used herein be consumptive also be irreversible.The variation that acid and water produce electrode for capacitors is an accumulative total property.
The method needs temperature sensor compensation, the compensation of the sensor reference chamber method of being mentioned below perhaps needing.
The monitoring of conductivity
The conductivity of the insulating oil of transformer is very low.But the acid of trace, the generation meeting of water greatly improve the numerical value of conductivity.
Also can be made into resistance with the same consumable electrode material in the above-mentioned capacitance type sensor.Electricity leads/and resistance sensor can make the series connection of a series of small resistance, such as 100 small resistance.Even the advantage of resistance series connection is acid and the water that produces seldom, even having only with one of them resistance, acid and water reacts, produces erosion, also can produce huge variation to whole resistance in series equivalent resistance.The effect that these a series of resistance in seriess produce is an amplification, the wherein variation of any one resistance value, the resistance of meeting large increase entire circuit.
Shown in Figure 5 is the resistance type sensor circuit that detects sour corrosion material in the oil.R1, R2, R3 are sheet resistance.The a point is that one group of resistance is in series to the b point.Sheet resistance is the main body of resistance, by constituting for the corrosive deposit sensitivity and material that be corroded easily.Resistance in same group can be that identical resistance value constitutes, but must not be.(R3 with R11, R21, R31) will not have certain difference to the resistance value of the resistance in (ab and a1b1) for R1, R2, and resistance value size at interval, and the group number of the resistance in series of different resistance values with the serviceable life of decision total system, are seen Fig. 6 not on the same group.Resistance also can be a series of resistance series connection, be combined in parallel, simply as shown in Figure 7.
The method needs temperature sensor compensation, the compensation of the sensor reference chamber method of being mentioned below perhaps needing.
The method of resistance capacitance recovery constant:
This method also is in conjunction with the above-mentioned capacitance type sensor and the method that monitoring proposed of conductivity.
Resistance and electric capacity can be series connection or in parallel.
The method needs temperature sensor compensation, the compensation of the sensor reference chamber method of being mentioned below perhaps needing.
The method of various making permanent type electric capacity above-mentioned and resistance electrode:
When two electrodes were very near, they constituted capacitor.When two electrodes immersed in the insulating oil fully, these two electrodes can be measured the capacitance values of oil, and simultaneously, two same electrodes also can be measured the resistance value of insulating oil.Bipolar electrode mode of the present invention can have a variety of.Can be two electrodes arranged side by side; Can be coaxial cylinder and cylinder; Can be the shape that keeps my fingers crossed, purpose be to make the sensor of big sensitivity in small size.
The method of various making deflection type electric capacity above-mentioned and resistance electrode:
The making of the electrode of deflection type electric capacity or resistance.Their shape can be the elongate in shape on insulator; It also can be the shape of round conductor.These materials can make metal, alloy, conductor or semiconductor material.
Being connected of resistance sensor and circuit can be to use mechanical type, physics, chemistry or electronics adhering technique.
These sensitive resistance/electric capacity can be the series connection of a lot of groups, combination in parallel.Such as 10 one group series connection earlier, all then series connection groups are in parallel again.Vice versa.
Because deflection type resistance sensor constantly has same new material to be exposed to the oil of being monitored, and changes oil plant at every turn, sensing system can recover zero state automatically.
The resistance that sensitive material is made can be the series connection and the combination in parallel of a lot of resistance capacitances.
Each group sensitive electrode can be a different materials, different-thickness, and different-diameter has different sensitivity thereby reach to different products, can prolong the life-span of sensing system.
In such monitoring system, because sensing unit is consumptive, the design of system can consider to be divided into several sections: main system, sensor parameters processing section, wirelessly transmitting data part (reusable parts), and consumptive part is the plug-in unit that can replace.
Above-mentioned sensor sensing electrode also can be the form of inductance component, thereby forms rlc circuit, perhaps pierce circuit with resistance, electric capacity.The frequency of circuit is exactly the parameter of sensor monitors.
Above-mentioned resistance, capacitance signal can be to exchange or the direct current measurement mode.Measurement by capacitance can use different frequencies.
The application of sensor reference chamber
Since the allocation ratio difference of various insulation oil plants, the coefficient difference that various sensors are initial.The reference chamber of sensor is to be used for reducing the error that such condition causes.Reference chamber also is to be used for reducing the error that the self-drift of sensor produces.Some sensor produces other error to the oil that flows, and the use of reference chamber also is in order to reduce the error that sensor causes mobiloil.
All the sensors can use in pairs, one is exposed in the insulating oil of being monitored, and one to be exposed to reference chamber the inside metastable, in the reference chamber of electrostatic screening, change thereby compensate various conditions, and the uncertainty that caused of the drift of sensor own.
This transformer insulation oil monitoring system can be included in other sensors of transformer outside.These sensors comprise electric-field sensor, optical sensor, fiery sensor, thermal sensor, gas sensor and video camera.
This sensing system adopts data fusion, and multiple parameter is used for judging the situation of transformer insulation oil through handling.
The data of this sensor monitoring system can adopt wired or wireless form transmission, and data are sent to control center.
Description of drawings
Fig. 1 is the synoptic diagram of the electric field intensity monitoring sensor among the present invention.
Fig. 2 is the circuit theory diagrams of the electric field intensity monitoring sensor among the present invention.
Fig. 3 is the synoptic diagram of the quartz crystal electronic monitoring sensor among the present invention.
Fig. 4 is the equivalent circuit diagram of Fig. 3 sensor.
Shown in Figure 5 is the resistance type sensor circuit that detects sour corrosion material in the oil.
Fig. 6 and Fig. 7 are several array mode examples that detect the resistance type sensor circuit of sour corrosion material in the oil.
Embodiment
In the embodiment shown in fig. 1, the electric wave signal that electric field intensity that high-tension transformer produces and electric field intensity gradient change particularly produces the photosignal of electrical discharge arc and spark, is sensed and receives by photoelectric crystal or dielectric mirror.These signals produce phase shift in the time of can making up light and the operation of descending light.Just can determine that by phase shift data electric field intensity and electric field intensity gradient that high-tension transformer produces change, thereby recognize the situation of transformer built-in electrical insulation oil-breaking.
In the embodiment shown in fig. 3, quartz crystal electronic monitoring sensor is very sensitive to the variation of small quality.In the monitoring of transformer insulation oil, we adopt is gold electrode for the oxidation extreme sensitivity.When acid and water occurring in the transformer insulation oil, the surface of air side gold electrode and measurement side gold electrode can produce reaction, thereby makes electrode quality increase (oxide adhesive electrodes surface) or reduce (corrode, oxide breaks away from electrode surface).So, the acid that produces when the insulating oil in the transformer is fissioned, the viscosity that water and gas caused change, as: the variation meeting of viscosity, temperature, specific inductive capacity and density is sensed by viscosity sensor, just and the result of reaction obtained with the form of data and transmitted.
The above is preferred embodiment of the present invention only, is not that the present invention is done any pro forma restriction.The those of ordinary skill of all industry, but all shown in the by specification and the above, implement the present invention swimmingly.But all those skilled in the art are not breaking away from the technical solution of the present invention scope, and a little change of making when utilizing the above technology contents that discloses, the equivalent variations of modifying and developing are equivalent embodiment of the present invention; Simultaneously, all foundations essence technology of the present invention all still belongs to the scope of technical scheme of the present invention to change, modification and the differentiation etc. of any equivalent variations that above embodiment did.
Claims (16)
1. the sensor of a monitoring liquid state and sensing system, it is characterized in that: the liquid that the sensor of described a kind of monitoring liquid state and sensing system are monitored comprises transformer insulation oil, engine oil, transmission oil, hydraulic transmission oil and edible oil; Especially, patent of the present invention provides the monitoring system of the transformer insulated oil quality of a kind of power transmission and transformation, patent of the present invention proposes to use simpler, sensitive, reliable sensors and more novel sensing system structure, this system not only implements monitoring to the gas in the transformer, and the main sensor that is to use is monitored the various physics of the oil sample of fissioning under the various conditions in the transformer, the comprehensive effect of chemical parameters, and the variation of the various environmental parameters of monitoring transformer periphery; This kind system can predict and points out when various sensors being surveyed the parameter that obtains carry out data fusion the equipment running status of being monitored and maintenance state; This liquid condition sensor detecting system comprises more than one sensor kind; This liquid condition sensing system comprises the detection of various physics to liquid, chemistry, material, biological parameter; This liquid condition sensing system comprises the detection to liquid memory exterior circumferential ambient condition; This liquid condition sensing system is surveyed the data that obtain through data fusion and output, and need provide parameter and prompting for the running status of institute's monitoring equipment and to the maintenance in future; This liquid sensor monitoring system can be carried out data transmission by wireless or wired system; This liquid sensor system has the shielded box that can reduce the sensor disturbance noise; This liquid sensor system comprises the sensor of being exposed to of the monitoring liquid parameter liquid of surveying, and also comprises simultaneously being exposed to the transformer sensor external; Patent of the present invention also can be applied to the data of monitoring system are transferred to Data Control Center in wired or wireless mode, also can be applied to the active preventive maintenance of intelligent grid.
2. the sensor of a kind of monitoring liquid state according to claim 1 and sensing system is characterized in that: the monitoring system of the transformer insulated oil quality of described power transmission and transformation has been used simpler, sensitivity, reliable sensors and sensing system structure.
3. the sensor of a kind of monitoring liquid state according to claim 1 and sensing system, it is characterized in that: this system not only implements monitoring to gas, and the main sensor that is to use is monitored the various physics of the oil sample of fissioning under the various conditions, the comprehensive effect of chemical parameters.
4. the sensor of a kind of monitoring liquid state according to claim 1 and sensing system is characterized in that: this liquid condition sensor detecting system comprises more than one sensor kind; The parameter that various sensor is monitored comprises specific inductive capacity, degree of corrosion, transparency, granularity, moisture, acid content, all gases content and the temperature of viscosity, liquid; This liquid condition sensing system according to claim 1 comprises the detection to liquid memory exterior circumferential ambient condition; These outer space environment states monitoring parameter comprise electric field intensity, electric-force gradient, magnetic field intensity, magnetic field gradient, temperature, light intensity and humidity.
5. the employed sensor of this liquid sensor monitoring system according to claim 1 comprises viscosity sensor, the specific inductive capacity sensor of liquid, degree of corrosion sensor, transparency sensor, particle sensor, moisture transducer, acid sensor, the gas sensor to liquid monitoring; Also comprise electric-field sensor, magnetic field sensor, temperature sensor, humidity sensor, optical sensor, video camera and camera; This class optical sensor, video camera and camera comprise visible light, ultraviolet and ultrared wavelength coverage.
6. this liquid sensor system according to claim 1 has the shielded box that can reduce the sensor disturbance noise; Can comprise the described all sensors of more than one any claim 5 in the shielded box.
7. this liquid sensor system according to claim 6 has the shielded box that can reduce the sensor disturbance noise; Can comprise the described all sensors of more than one any claim 5 in the shielded box; When process sensor data, the similar inside and outside sensing data of shielded box that is positioned at will be used to perform mathematical calculations, thereby reduce sensor because the drift of the aging caused sensor output parameter of self; By the more similar sensing data that is positioned at inside and outside the shielded box, also can reduce sensor because impurity attached sensors surface, temperature variation, humidity change, the error of the parameter sensor output parameter that skewness caused in fuel tank that flows and monitored of oil.
8. the sensing system of a checkout equipment internal liquid state: this liquid condition sensor detecting system comprises more than one sensor kind; This liquid condition sensing system comprises the detection to the various physics of liquid, chemistry, material and biological parameter; This liquid condition sensing system comprises the detection to liquid memory exterior circumferential ambient condition; This liquid condition sensing system is surveyed the data that obtain through data fusion and output, and need provide parameter and prompting for the running status of institute's monitoring equipment and to the maintenance in future; This liquid sensor monitoring system can be carried out data transmission by wireless or wired system; This liquid sensor system has the shielded box that can reduce the sensor disturbance noise; This liquid sensor system comprises the sensor of being exposed to of the monitoring liquid parameter liquid of surveying, and also comprises simultaneously being exposed to the transformer sensor external.
9. monitored equipment according to claim 8 is the power transmission and transformation transformers.
10. monitored equipment according to claim 8 is generator.
11. monitored equipment according to claim 8 is engine; Engine comprises aircraft engine, marine engine, vehicle motor.
12. monitored equipment according to claim 8 is variator; Variator comprises the aircraft variator, variator peculiar to vessel, transmission for vehicles.
13. monitored equipment according to claim 8 is various hydraulic transmission equipments.
14. monitored equipment according to claim 8 is the various equipment that need lubricating oil.
15. acid sensor according to claim 5 is a kind of resistance sensor; The resistance value of this resistance sensor is made by the material of acid attack easily by a kind of, and after resistance material is by acid attack, resistance value will improve; When the acid of trace constantly generated, the material of resistance was constantly corroded by acid, thereby resistance value is constantly risen.
16. acid sensor according to claim 5 is a kind of resistance sensor; The resistance value of this resistance sensor is made by the material of acid attack easily by a kind of, and after resistance material is by acid attack, resistance value will improve; Resistance sensor according to claim 16 is to be formed by this type of resistance sensor series connection more than a group; Resistance sensor according to claim 16 is to be formed by this type of resistance sensor parallel connection more than a group; Resistance sensor according to claim 16 is by in parallel again after the series connection of this type of resistance sensor more than a group and form; Resistance sensor according to claim 16 is to be connected later on again and formed by this type of resistance sensor parallel connection more than a group; Resistance sensor according to claim 16 is to be made of the material that can be etched with different-thickness more than a group.
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| CN2011100913849A CN102252712A (en) | 2011-04-09 | 2011-04-09 | Quality monitoring system of high-voltage transmission and transformation transformer insulating oil |
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| CN2011100913849A CN102252712A (en) | 2011-04-09 | 2011-04-09 | Quality monitoring system of high-voltage transmission and transformation transformer insulating oil |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102539283A (en) * | 2011-01-06 | 2012-07-04 | 北京盈胜泰科技术有限公司 | System for monitoring ingredient change of insulating oil of transformer |
| CN102585991A (en) * | 2011-12-22 | 2012-07-18 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN103712872A (en) * | 2012-09-28 | 2014-04-09 | 中国石油化工股份有限公司 | Method for evaluating low temperature corrosion performance of oil product |
| CN104114998A (en) * | 2012-02-17 | 2014-10-22 | 纳博特斯克有限公司 | Lubricating oil deterioration sensor and machine provided with same |
| CN106644828A (en) * | 2016-10-27 | 2017-05-10 | 北京润道油液监测技术有限公司 | Test system for testing comprehensive information of oil sample and method of test system |
| CN108780078A (en) * | 2016-02-23 | 2018-11-09 | C·C·詹森有限公司 | Liquid condition evaluation for multi-mode working system |
| CN111948282A (en) * | 2020-07-07 | 2020-11-17 | 上海交通大学 | Method for detecting physical and chemical properties of transformer oil |
| CN114111902A (en) * | 2021-11-24 | 2022-03-01 | 保定天威保变电气股份有限公司 | Intelligent monitoring system for natural ester transformer |
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2011
- 2011-04-09 CN CN2011100913849A patent/CN102252712A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539283A (en) * | 2011-01-06 | 2012-07-04 | 北京盈胜泰科技术有限公司 | System for monitoring ingredient change of insulating oil of transformer |
| CN102585991A (en) * | 2011-12-22 | 2012-07-18 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN102585991B (en) * | 2011-12-22 | 2014-06-04 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN104114998A (en) * | 2012-02-17 | 2014-10-22 | 纳博特斯克有限公司 | Lubricating oil deterioration sensor and machine provided with same |
| CN103712872A (en) * | 2012-09-28 | 2014-04-09 | 中国石油化工股份有限公司 | Method for evaluating low temperature corrosion performance of oil product |
| CN108780078A (en) * | 2016-02-23 | 2018-11-09 | C·C·詹森有限公司 | Liquid condition evaluation for multi-mode working system |
| CN108780078B (en) * | 2016-02-23 | 2021-05-14 | C·C·詹森有限公司 | Fluid condition assessment for multi-mode operating system |
| CN106644828A (en) * | 2016-10-27 | 2017-05-10 | 北京润道油液监测技术有限公司 | Test system for testing comprehensive information of oil sample and method of test system |
| CN111948282A (en) * | 2020-07-07 | 2020-11-17 | 上海交通大学 | Method for detecting physical and chemical properties of transformer oil |
| CN111948282B (en) * | 2020-07-07 | 2021-06-25 | 上海交通大学 | Method for detecting physical and chemical properties of transformer oil |
| CN114111902A (en) * | 2021-11-24 | 2022-03-01 | 保定天威保变电气股份有限公司 | Intelligent monitoring system for natural ester transformer |
| CN114111902B (en) * | 2021-11-24 | 2024-04-05 | 保定天威保变电气股份有限公司 | Intelligent monitoring system for natural ester transformer |
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Inventor after: Lou Tianyan Inventor after: James.Liu Inventor after: Jiang Qiang Inventor after: Qu Guanxing Inventor after: Lou Yuqi Inventor after: Sun Xiaodan Inventor before: Lou Tianyan Inventor before: James.Liu |
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Application publication date: 20111123 |