CN105445335A - Humidity sensing system for monitoring insulation state of power transformer - Google Patents
Humidity sensing system for monitoring insulation state of power transformer Download PDFInfo
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- CN105445335A CN105445335A CN201510789521.4A CN201510789521A CN105445335A CN 105445335 A CN105445335 A CN 105445335A CN 201510789521 A CN201510789521 A CN 201510789521A CN 105445335 A CN105445335 A CN 105445335A
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Abstract
The invention discloses a humidity sensing system for monitoring an insulation state of a power transformer. The humidity sensing system comprises a transformer oil tank, an oil gas separating film, a permeating gas eduction chamber, a humidity sensing element, a capacitance-voltage switching circuit, an ATmega 128 microprocessor, an HC-12 wireless communication module and an audible and visual alarm, wherein the humidity sensing element is served as a humidity sensing film by modifying a graphene oxide compound film with nanometer zinc oxide and is prepared on a ceramic substrate with a dual-rectangular shaped interdigital electrode ceramic substrate. According to the humidity sensing system, the permeating gas in the transformer oil is filtered through the oil gas separating film and then is guided into the permeating gas eduction chamber, the humidity sensing element is arranged in the eduction chamber for the permeating gas in the transformer oil and the humidity detection for the transformer oil environment is realized by detecting the capacitance change of the humidity sensing film; the humidity sensing system has the functions of data collection, storage, display and audible and visual alarm; the monitoring data is sent to an upper computer and remote wireless communication. The humidity sensing system can judge the insulation state of the power transformer and make early warning according to the corresponding humidity change and has the characteristics of anti-electromagnetic interference, high sensitivity, stability, reliability, and the like.
Description
Technical field
The present invention relates to a kind of humidity sensing system and preparation method thereof, be specifically related to a kind of nano oxidized Zinc modified graphene oxide film capacitor type humidity sensing system for electric power transformer insulated status monitoring.
Background technology
Large-scale power transformer is as the hub device of electric system, and its safe operation seems particularly important to guarantee power system safety and stability, once transformer breaks down, causes huge loss by national economy.Electric power transformer insulated status monitoring is attention in intelligent grid is built.The power transformer 90% used in each generating plant of China and transformer station is oil-filled transformer, the insulation system of such transformer is based on insulating oil and insulating paper, in long-time running, the change of its humidity can cause insulating property serious deterioration, causes electrical equipment fault and even blasts.Therefore, the humidity detection of electric power transformer insulated oil environment is Transformer Fault Diagnosis, comparatively effective important means and decision-making foundation occur prevention catastrophic failure, most important for stabilization of power grids safe operation, raising plant factor and reduction overhaul of the equipments expense.
The humidity-sensitive element of humidity sensor mainly contains resistance-type and the large class of condenser type two, and the capacitance type humidity sensor the most successful class humidity sensor that is current commercialization, because it has highly sensitive, low in energy consumption, low cost and other advantages.Along with the continuous maturation of MEMS process technology, with the humidity sensor of MEMS technology processing have that volume is little, cost is low, low in energy consumption, be easy to the advantages such as batch production, therefore very applicable miniaturization, low-power consumption humidity sensor.Humidity-sensitive element is the core parts that humidity sensor detects external environment humidity, adopt high molecular polymer, stupalith at present more, metal oxide is as the humidity-sensitive material of capacitance type humidity sensor, high molecular polymer class wet sensitive device adopts comparatively extensive, but because the heat-resisting quantity of its moisture absorption layer is poor, this makes such sensor not to be applied to hot environment, and occurs serious humidity hysteresis under conditions of high humidity; Semiconductor ceramics class wet sensitive device has the advantages such as stable performance, high temperature applicability, sensing range be wide, but is subject to the interference of ETS and organic gas, needs regular heating regenerate its humidity sensitivity; Metal oxide wet sensitive device has the characteristics such as high temperature resistant and highly sensitive, but can only under need of work high temperature, and power consumption is large, the shortcomings such as the life-span is short.Study and Development novel nano humidity-sensitive material has the realistic meaning of outbalance, and is an important directions of humidity sensing element development.
Graphene, successfully isolated in an experiment in 2004 by Univ Manchester UK physicist An Deliehaimu and Constantine Nuo Woxiaoluofu, two people obtain Nobel Prize in physics in 2010 jointly because of " testing in the initiative of two-dimensional graphene material ".Grapheme material is perfect two dimensional crystal material, there is the gas absorption performance of high conductivity, excellent mechanical property, bigger serface and brilliance, demonstrate the application prospect on the quick sensing element of air humidity, it is found to be the novel wet sensitive sensing element of research and development and system provides a kind of new way.Graphene oxide as a class important derivatives of Graphene, its basic structure and Graphene similar, the functionalization graphene having oxygen-containing functional group at carbon atomic layer and carbon atomic layer edge conjunction can be regarded as.Due to rich oxygen-containing functional group, make graphene oxide not only have bigger serface, preferably chemical constitution and stability, also there is excellent Solution Dispersion characteristic and water-wet behavior.Thus be compared to Graphene, graphene oxide becomes a kind of humidity-sensitive material having more potentiality.Along with the development of nano combined sensitive material, the composite sensitive material based on modified metal oxide graphene oxide will obtain more excellent wet sensitive performance.The invention discloses a kind of humidity sensing system for electric power transformer insulated status monitoring, adopt nano oxidized Zinc modified graphene oxide composite membrane to make humidity sensing element as wet sensitive sense film, have that technique is simple, electromagnetism interference, high sensitivity, the technical advantage such as reliable and stable.
Summary of the invention
The present invention seeks to overcome the deficiencies in the prior art, a kind of humidity sensing system of electric power transformer insulated status monitoring is provided, comprises oil tank of transformer, gas-oil separation film, infiltration gas extraction room, humidity sensing element, capacitance-voltage change-over circuit, microprocessor, wireless communication module, audible-visual annunciator.Described humidity sensing element adopts nano oxidized Zinc modified graphene oxide composite membrane as wet sensitive sense film, be prepared in there is back-shaped interdigital electrode ceramic substrate on, the Humidity Detection of transformer oil environment is realized by the capacitance variations detecting humidity sensitive thin film, electric power transformer insulated state is judged and makes early warning that there is the advantages such as high, the quick response of high sensitivity, electromagnetism interference according to corresponding humidity change.
The present invention is achieved through the following technical solutions above-mentioned purpose, deposition preparation technology is from bottom to top adopted in the ceramic substrate with back-shaped interdigital electrode, to construct nano oxidized Zinc modified graphene oxide composite membrane as wet sensitive sense film, be placed in transformer oil infiltration gas and draw room, be connected with computing machine with testing circuit, realize Monitoring Data and send host computer and wireless remote transmission to, assessment is made to transformer insulation state.
The ceramic substrate thickness of humidity sensing element of the present invention is 130 microns, it is manufactured with back-shaped interdigital electrode pattern and electrode pad.
The back-shaped interdigital electrode of humidity sensing element of the present invention is copper nickel combination electrode, and be made up of the first electrode and the second electrode, electrode separation is 25 microns, and thickness is 15 microns.
The wet sensitive sense film thickness of humidity sensing element of the present invention is 0.5-0.7 micron, is the nano thin-film that the stratiform of nano zine oxide and graphene oxide formation replaces.
Nano zine oxide of the present invention adopts following methods preparation: be first dissolved in 100mL deionized water by 6.7g zinc nitrate, and slowly add 30mL sodium hydroxide solution (3mol/L) to above-mentioned solution; Then transfer in pyroreaction still after above-mentioned mixed solution being stirred 1-2h, at 160 DEG C, react 10h, naturally cool to room temperature afterwards; Last centrifuging, obtains nano oxidized zinc solution with after deionized water and absolute ethanol washing 4-5 time successively by gained sample.
Nano oxidized Zinc modified graphene oxide film preparation method of the present invention is as follows: first configure the nano oxidized zinc solution of 3mg/mL concentration and the diallyl dimethyl ammoniumchloride blend solution of 10mg/mL concentration, the graphene oxide dispersion of preparation 0.4mg/mL concentration, respectively oscillation treatment 40 minutes under 30kHz ultrasound wave; Then, in above-mentioned nano zine oxide-diallyl dimethyl ammoniumchloride blend solution, soak the above-mentioned ceramic substrate with back-shaped interdigital electrode 25 minutes, take out, washed with de-ionized water, nitrogen dries up; Secondly, in graphene oxide solution, soak the above-mentioned ceramic substrate with back-shaped interdigital electrode 25 minutes, take out, washed with de-ionized water, nitrogen dries up; Aforesaid operations repeats 4 times, finally the device of preparation is put into vacuum drying chamber 80 DEG C process 3.5 hours, obtains the wet sensitive sensing element being coated with nano oxidized Zinc modified graphene oxide composite membrane.
Nano oxidized zinc solution of the present invention and diallyl dimethyl ammoniumchloride solution blending after ultrasonic process, with weak positive charge, graphene oxide particle is with weak negative charge.
Humidity sensing element of the present invention is connected with capacitance-voltage change-over circuit, ATmega128 microprocessor, audible-visual annunciator, HC-12 wireless communication module, there is data acquisition, storage, display, sound and light of alarm, sends host computer and wireless remote transmission to by Monitoring Data.
The wet sensitive sensing element preparation technology that the present invention adopts is simple and convenient, does not rely on harsh Preparation equipment, with low cost, and has fast response time, the feature of repeatability and good stability.
Accompanying drawing explanation
Fig. 1 is an example of embodiment of the present invention, 1 is oil tank of transformer, 2 is transformer, and 3 is insulating oil, and 4 is gas-oil separation film, 5 is that in transformer oil, infiltration gas draws room, 6 is nano oxidized Zinc modified graphene oxide film humidity sensing element, and 7 is capacitance-voltage change-over circuit, and 8 is ATmega128 microprocessor, 9 be audible-visual annunciator, 10 for HC-12 wireless communication module, 11 is computing machine.
Fig. 2 is the nano oxidized Zinc modified graphene oxide film humidity sensing element schematic cross-section in the present invention, 1 is ceramic substrate, 2 is the first electrode of back-shaped interdigital electrode, and 3 is the second electrode of back-shaped interdigital electrode, and 4 is nano oxidized Zinc modified graphene oxide film.
Fig. 3 is the scanning electron microscope image of the nano oxidized Zinc modified graphene oxide composite membrane in the present invention.
Fig. 4 is the electric capacity response of nano oxidized Zinc modified graphene oxide film humidity sensing element under different relative humidity in the present invention.
Fig. 5 be electric capacity under 0%, 12%, 23%, 33%, 43%, 52%, 67%, 75%, 85%, 97% humidity of nano oxidized Zinc modified graphene oxide film humidity sensing element in the present invention and time response curve.
Embodiment
Following examples will the invention will be further described by reference to the accompanying drawings.
See Fig. 1, the embodiment of the present invention is used for the Humidity Detection in power transformer 2 insulating oil 3, be placed in the transformer oil infiltration gas after gas-oil separation film 4 filters and draw room 5, the Humidity Detection of transformer oil environment is realized by the capacitance variations detecting humidity sensitive thin film, judge electric power transformer insulated state according to corresponding humidity change, and make early warning.
See Fig. 2, the embodiment of the present invention is provided with ceramic substrate 1, the first electrode 2 of back-shaped interdigital electrode, the second electrode 3 of back-shaped interdigital electrode, nano oxidized Zinc modified graphene oxide film 4.
Nano oxidized Zinc modified graphene oxide composite membrane preparation method described in the embodiment of the present invention is as follows: first configure the nano oxidized zinc solution of 3mg/mL concentration and the diallyl dimethyl ammoniumchloride blend solution of 10mg/mL concentration, the graphene oxide dispersion of preparation 0.4mg/mL concentration, respectively oscillation treatment 40 minutes under 30kHz ultrasound wave; Then, in above-mentioned nano zine oxide-diallyl dimethyl ammoniumchloride blend solution, soak the above-mentioned ceramic substrate with back-shaped interdigital electrode 25 minutes, take out, washed with de-ionized water, nitrogen dries up; Secondly, in graphene oxide solution, soak the above-mentioned ceramic substrate with back-shaped interdigital electrode 25 minutes, take out, washed with de-ionized water, nitrogen dries up; Aforesaid operations repeats 4 times, finally the device of preparation is put into vacuum drying chamber 80 DEG C process 3.5 hours, obtains the wet sensitive sensing element being coated with nano oxidized Zinc modified graphene oxide composite membrane.
Fig. 3 is the scanning electron microscope image of nano oxidized Zinc modified graphene oxide composite membrane prepared by the embodiment of the present invention.
Wet sensitive sensing element prepared by the embodiment of the present invention is connected with capacitance-voltage change-over circuit 7, ATmega128 microprocessor 8, audible-visual annunciator 9, HC-12 wireless communication module 10, computing machine 11, there is data acquisition, storage, display, sound and light of alarm, sends host computer and wireless remote transmission to by Monitoring Data.
Be 0%-97% for test environment relative humidity, record the detection that the change of embodiment of the present invention humidity sensing element capacitance under corresponding humidity environment realizes relative humidity, as shown in Figure 4, capacitance variations and relative humidity have good response relation.
0%, 11%, 23%, 33%, 43%, 52%, 67% is respectively for test environment relative humidity, 75%, 85%, 97%, embodiment of the present invention humidity sensing element is put into the detection that different humidity environments realizes relative humidity successively, there is response rapidly, high stability, highly sensitive advantage, as shown in Figure 5.
Claims (6)
1. the humidity sensing system of an electric power transformer insulated status monitoring, comprise oil tank of transformer, gas-oil separation film, infiltration gas extraction room, humidity sensing element, capacitance-voltage change-over circuit, microprocessor, wireless communication module, audible-visual annunciator, it is characterized in that this humidity sensing element adopt nano oxidized Zinc modified graphene oxide composite membrane as wet sensitive sense film, be deposited on there is back-shaped interdigital electrode ceramic substrate on; This humidity sensing element is placed in transformer oil infiltration gas and draws room, is realized the Humidity Detection of transformer oil environment by the capacitance variations detecting humidity sensitive thin film, judges electric power transformer insulated state, and make early warning according to corresponding humidity change.
2. humidity sensing system according to claim 1, is characterized in that: the wet sensitive sense film thickness of described humidity sensing element is 0.5-0.7 micron, is the nano thin-film that the stratiform of nano zine oxide and graphene oxide formation replaces.
3. humidity sensing system according to claim 1, is characterized in that: the ceramic substrate thickness of described humidity sensing element is 130 microns, it is manufactured with back-shaped interdigital electrode pattern and electrode pad.
4. humidity sensing system according to claim 1, is characterized in that: the back-shaped interdigital electrode of described humidity sensing element is copper nickel combination electrode, and be made up of the first electrode and the second electrode, electrode separation is 25 microns, and thickness is 15 microns.
5. humidity sensing system according to claim 1, it is characterized in that: described humidity sensing element is connected with capacitance-voltage change-over circuit, ATmega128 microprocessor, audible-visual annunciator, HC-12 wireless communication module, computing machine, there is data acquisition, storage, display, sound and light of alarm, sends host computer and wireless remote transmission to by Monitoring Data.
6. humidity sensing system according to claim 1, is characterized in that: the preparation of the wet sensitive sense film of described wet sensitive sensing element comprises the following steps:
(1) the nano oxidized zinc solution of 3mg/mL concentration and the diallyl dimethyl ammoniumchloride blend solution of 10mg/mL concentration is configured, the graphene oxide dispersion of preparation 0.4mg/mL concentration, respectively oscillation treatment 40 minutes under 30kHz ultrasound wave;
(2) in above-mentioned nano zine oxide-diallyl dimethyl ammoniumchloride blend solution, soak the above-mentioned ceramic substrate with back-shaped interdigital electrode 25 minutes, take out, washed with de-ionized water, nitrogen dries up;
(3) in graphene oxide solution, soak the above-mentioned ceramic substrate with back-shaped interdigital electrode 25 minutes, take out, washed with de-ionized water, nitrogen dries up;
(4) repetitive cycling step (2) and (3) each 4 times, finally put into vacuum drying chamber 80 DEG C process 3.5 hours, obtain the wet sensitive sensing element being coated with nano oxidized Zinc modified graphene oxide composite membrane by the device of preparation.
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| CN105954323A (en) * | 2016-06-02 | 2016-09-21 | 中国石油大学(华东) | Intelligent ultralow-concentration monitoring device for gaseous pollutants discharged by thermal power plant |
| CN106018492A (en) * | 2016-05-27 | 2016-10-12 | 中国南方电网有限责任公司电网技术研究中心 | Method, device and system for detecting insulator surface dirt and moisture |
| CN106044845A (en) * | 2016-05-26 | 2016-10-26 | 中国科学院合肥物质科学研究院 | Graphene oxide modified orderly porous zinc oxide composite film and preparation method thereof |
| CN106093135A (en) * | 2016-06-02 | 2016-11-09 | 中国石油大学(华东) | A kind of Power Transformer Faults intelligent diagnostics device based on Graphene gas sensor array |
| CN106124574A (en) * | 2016-06-16 | 2016-11-16 | 西南交通大学 | Graphene oxide quantum dot humidity sensor and preparation method thereof |
| CN106448121A (en) * | 2016-12-12 | 2017-02-22 | 北京强度环境研究所 | Wireless sensor |
| CN107449806A (en) * | 2017-07-28 | 2017-12-08 | 深圳市益鑫智能科技有限公司 | Humidity sensing system for electric power transformer insulated status monitoring |
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| CN110662956A (en) * | 2017-05-26 | 2020-01-07 | 株式会社电装 | Granular substance detection system |
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| CN106044845A (en) * | 2016-05-26 | 2016-10-26 | 中国科学院合肥物质科学研究院 | Graphene oxide modified orderly porous zinc oxide composite film and preparation method thereof |
| CN106018492A (en) * | 2016-05-27 | 2016-10-12 | 中国南方电网有限责任公司电网技术研究中心 | Method, device and system for detecting insulator surface dirt and moisture |
| CN106093135A (en) * | 2016-06-02 | 2016-11-09 | 中国石油大学(华东) | A kind of Power Transformer Faults intelligent diagnostics device based on Graphene gas sensor array |
| CN106093135B (en) * | 2016-06-02 | 2020-11-10 | 中国石油大学(华东) | Power transformer fault intelligent diagnosis device based on graphene gas sensor array |
| CN105954323A (en) * | 2016-06-02 | 2016-09-21 | 中国石油大学(华东) | Intelligent ultralow-concentration monitoring device for gaseous pollutants discharged by thermal power plant |
| CN106124574B (en) * | 2016-06-16 | 2019-04-12 | 西南交通大学 | Graphene oxide quantum dot humidity sensor and preparation method thereof |
| CN106124574A (en) * | 2016-06-16 | 2016-11-16 | 西南交通大学 | Graphene oxide quantum dot humidity sensor and preparation method thereof |
| CN106448121A (en) * | 2016-12-12 | 2017-02-22 | 北京强度环境研究所 | Wireless sensor |
| CN110662956A (en) * | 2017-05-26 | 2020-01-07 | 株式会社电装 | Granular substance detection system |
| CN109270130A (en) * | 2017-07-18 | 2019-01-25 | 波士顿科学国际有限公司 | System and method for the analyte sensing in physiology gaseous sample |
| CN109270130B (en) * | 2017-07-18 | 2023-08-29 | 明尼苏达大学董事会 | Systems and methods for analyte sensing in a physiological gas sample |
| US11714058B2 (en) | 2017-07-18 | 2023-08-01 | Regents Of The University Of Minnesota | Systems and methods for analyte sensing in physiological gas samples |
| CN107449806A (en) * | 2017-07-28 | 2017-12-08 | 深圳市益鑫智能科技有限公司 | Humidity sensing system for electric power transformer insulated status monitoring |
| US11835435B2 (en) | 2018-11-27 | 2023-12-05 | Regents Of The University Of Minnesota | Systems and methods for detecting a health condition |
| US11662325B2 (en) | 2018-12-18 | 2023-05-30 | Regents Of The University Of Minnesota | Systems and methods for measuring kinetic response of chemical sensor elements |
| CN111458663A (en) * | 2020-05-21 | 2020-07-28 | 福州大学 | Oiled paper capacitive bushing moisture monitoring device and method based on air humidity sensing |
| CN111458663B (en) * | 2020-05-21 | 2021-11-02 | 福州大学 | Oiled paper capacitive bushing moisture monitoring device and method based on air humidity sensing |
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| CN113219050A (en) * | 2021-07-07 | 2021-08-06 | 湖南大学 | Ultra-high sensitivity surface acoustic wave humidity sensor |
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