CN111474328A - Transformer oil detection device and oil-filled electrical equipment - Google Patents
Transformer oil detection device and oil-filled electrical equipment Download PDFInfo
- Publication number
- CN111474328A CN111474328A CN202010309533.3A CN202010309533A CN111474328A CN 111474328 A CN111474328 A CN 111474328A CN 202010309533 A CN202010309533 A CN 202010309533A CN 111474328 A CN111474328 A CN 111474328A
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- oil
- signal
- probe
- electrical equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 239000001257 hydrogen Substances 0.000 claims abstract description 63
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 63
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000012545 processing Methods 0.000 claims abstract description 34
- 239000000523 sample Substances 0.000 claims abstract description 29
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 60
- 238000000034 method Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910001252 Pd alloy Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006250 specific catalysis Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The application discloses detection device and oil-filled electrical equipment of transformer oil, the device specifically includes probe, signal processing circuit and backstage equipment. The probe is arranged in the transformer oil filled with electrical equipment, and comprises a hydrogen-sensitive sensor, wherein the hydrogen-sensitive sensor is used for detecting the content of hydrogen in the transformer oil and outputting a detection signal; the signal processing circuit is in signal connection with the probe and is used for processing the detection signal to obtain a hydrogen content value in the transformer; and the background equipment is in signal connection with the output end of the signal processing circuit and is used for outputting alarm information for prompting when the hydrogen content value exceeds the standard. Detection device in this scheme can output testing result and alarm information in real time, has improved detection efficiency, has avoided causing the influence to the safe operation of oil charge electrical equipment.
Description
Technical Field
The application relates to the technical field of electric power, more specifically relates to a hydrogen detection device and oil-filled electrical equipment of transformer oil.
Background
Transformer oil is filled in general oil-filled electrical equipment and used for cooling and extinguishing arcs of windings or components in the equipment and improving insulativity. The transformer oil is a mineral oil obtained by distillation and refining of natural petroleum, and is a mixture of pure, stable, low-viscosity, good-insulation and good-cooling liquid natural hydrocarbons obtained by acid-base refining of lubricating oil fractions in the petroleum. Commonly known as square greenhouse oil, light yellow transparent liquid.
When the oil-filled electrical equipment has a fault, a relatively large amount of dissolved gas such as hydrogen gas is generated in the transformer oil, and thus the dissolved gas is called fault characteristic gas. The most effective means of monitoring the safe operation of oil-filled electrical equipment is by analyzing the composition and content of dissolved gases in the oil.
At present, in order to obtain the detailed content of dissolved gas, the dissolved gas needs to be sampled and then sent to a laboratory for offline detection, and a long time is needed to obtain a result, so that a fault alarm cannot be given in time, and the safe operation of oil-filled electrical equipment such as a transformer and the like is directly influenced.
Disclosure of Invention
In view of this, the application provides a detection device for transformer oil and oil-filled electrical equipment for carry out the quick detection to the content of the hydrogen that transformer oil contains, in order to improve detection efficiency, avoid causing the influence to oil-filled electrical equipment's safe operation.
In order to achieve the above object, the following solutions are proposed:
a detection device of transformer oil is applied to oil-filled electrical equipment, and the hydrogen detection device comprises:
the probe is arranged in the transformer oil filled with the electrical equipment and comprises a hydrogen-sensitive sensor, and the hydrogen-sensitive sensor is used for detecting the content of hydrogen in the transformer oil and outputting a detection signal;
the signal processing circuit is in signal connection with the probe and is used for processing the detection signal to obtain a hydrogen content value in the transformer;
and the background equipment is in signal connection with the output end of the signal processing circuit and is used for outputting alarm information when the hydrogen content value exceeds the standard, and the alarm information is used for prompting operation and maintenance personnel that potential safety hazards exist in the electric equipment filled with the hydrogen.
Optionally, the signal processing circuit includes a processor and a digital communication interface, wherein:
the processor is used for processing the detection signal to obtain a hydrogen content value;
the digital communication interface is used for sending the hydrogen content value to the background equipment.
Optionally, the processor includes a DSP processor and an ARM processor.
Optionally, the probe further comprises an oil temperature sensor.
Optionally, the probe further comprises a micro water sensor.
Optionally, the probe further comprises a pressure sensor.
Optionally, the probe further comprises a temperature controller, wherein:
the temperature controller is used for keeping the temperature of the environment where the hydrogen sensitive sensor is located within a preset temperature range.
Optionally, the temperature controller further comprises a temperature sensor and a heater.
An oil-filled electrical apparatus, optionally provided with a detection device as described above.
According to the technical scheme, the application discloses a detection device for transformer oil and oil-filled electrical equipment. The probe is arranged in the transformer oil filled with electrical equipment, and comprises a hydrogen-sensitive sensor, wherein the hydrogen-sensitive sensor is used for detecting the content of hydrogen in the transformer oil and outputting a detection signal; the signal processing circuit is in signal connection with the probe and is used for processing the detection signal to obtain a hydrogen content value in the transformer; and the background equipment is in signal connection with the output end of the signal processing circuit and is used for outputting alarm information for prompting when the hydrogen content value exceeds the standard. Detection device in this scheme can output testing result and alarm information in real time, has improved detection efficiency, has avoided causing the influence to the safe operation of oil charge electrical equipment.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a transformer oil detection device according to an embodiment of the present disclosure;
FIG. 2 is a block diagram of another apparatus for detecting transformer oil according to an embodiment of the present disclosure;
fig. 3 is a block diagram of another apparatus for detecting transformer oil according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a block diagram of a detection apparatus for transformer oil according to an embodiment of the present application.
As shown in fig. 1, the detection device provided in this embodiment is applied to oil-filled electrical equipment, such as a transformer, a mutual inductor, and the like, and is used for detecting the content of hydrogen in transformer oil filled therein. The detection device specifically comprises a probe 10, a signal processing circuit 20 and a background device 30.
The probe is arranged in the oil-filled electrical equipment, particularly soaked in transformer oil in the oil-filled electrical equipment, a hydrogen sensor 11 is arranged in the probe, and the hydrogen sensor is used for detecting the content of hydrogen in the transformer oil, generating a detection signal and outputting the detection signal to a signal processing circuit.
This hydrogen sensitive sensor specifically is a hydrogen sensor chip, and hydrogen sensor chip adopts solid-state palladium alloy material to make a neotype sensitive film, and based on palladium to the specific catalysis principle of hydrogen, when having hydrogen in the transformer oil, the hydrogen molecule is catalyzed into the hydrogen atom, adsorbs in palladium alloy's crystal lattice, causes the change of resistance or electric capacity, and the rethread supporting circuit changes the variation of resistance or electric capacity into the concentration signal of hydrogen, preceding detected signal promptly to realize the hydrogen and measure.
The hydrogen sensor can be directly inserted into the transformer oil for measurement by adopting a solid palladium alloy film technology, does not need an oil-gas separation device, and can quickly cope with the change of the hydrogen concentration in the transformer oil; the absolute specific response to the hydrogen is not interfered by other combustible gases, so that the reliability of hydrogen measurement is ensured; the method is not influenced by vacuum and positive pressure, no hydrogen is consumed in the testing process, and the measurement accuracy of ppm-level hydrogen can be ensured.
And the signal input end of the signal processing circuit is connected with the probe and used for receiving the detection signal and processing the detection signal so as to obtain the hydrogen content value in the transformer oil. The signal processing circuit is also provided with a signal output end.
The signal processing circuitry comprises a processor 21 and a digital communication interface 22 as shown in fig. 2. The processor adopts a high-performance DSP + ARM dual processor, the DSP processor completes real-time calculation of four signal samples and hydrogen change rate calculation, and the ARM processor is responsible for communication and display. The digital communication interface comprises an RS232 interface and an RS485 interface and is used for transmitting the data processed by the processor to the background equipment.
The background equipment is connected with the signal output end of the signal processing circuit, a corresponding threshold value is further arranged in the background equipment, when the hydrogen content value exceeds the threshold value, alarm information is output and used for prompting operation and maintenance personnel that potential safety hazards exist in the oil-filled electrical equipment, and therefore the operation and maintenance personnel can take treatment measures in time according to the alarm information, and operation with diseases of the oil-filled electrical equipment can be avoided.
According to the technical scheme, the embodiment provides the detection device for the transformer oil, and the detection device is applied to oil-filled electrical equipment and specifically comprises a probe, a signal processing circuit and background equipment. The probe is arranged in the transformer oil filled with electrical equipment, and comprises a hydrogen-sensitive sensor, wherein the hydrogen-sensitive sensor is used for detecting the content of hydrogen in the transformer oil and outputting a detection signal; the signal processing circuit is in signal connection with the probe and is used for processing the detection signal to obtain a hydrogen content value in the transformer; and the background equipment is in signal connection with the output end of the signal processing circuit and is used for outputting alarm information for prompting when the hydrogen content value exceeds the standard. Detection device in this scheme can output testing result and alarm information in real time, has improved detection efficiency, has avoided causing the influence to the safe operation of oil charge electrical equipment.
In addition, as shown in fig. 3, in another embodiment of the present application, the probe further includes an oil temperature sensor 12, a micro water sensor 13, and a pressure sensor 14, which are respectively used for detecting the oil temperature, the water content, and the pressure of the transformer oil, and outputting the oil temperature, the water content, and the pressure obtained through processing by the signal processing circuit to the background device, so that the operation and maintenance personnel can call the operation and maintenance personnel at any time.
The probe also comprises a temperature controller 15, wherein a heater 151 and a temperature sensor 152 are integrated in the temperature controller, the temperature controller and the temperature sensor can ensure that the working temperature of the chip is constant, the influence caused by the fluctuation of the ambient temperature or the oil temperature of the transformer and the flow rate of air flow is reduced, and the measurement accuracy of the hydrogen sensitive sensor is improved.
Example two
The embodiment provides an oil-filled electrical device, which can be a transformer or a mutual inductor, and also can be other electrical devices using transformer oil as a heat dissipation medium. The oil-filled electrical equipment is provided with the detection equipment provided by the above embodiment.
The detection device comprises a probe, a signal processing circuit and a background device. The probe is arranged in the transformer oil filled with electrical equipment, and comprises a hydrogen-sensitive sensor, wherein the hydrogen-sensitive sensor is used for detecting the content of hydrogen in the transformer oil and outputting a detection signal; the signal processing circuit is in signal connection with the probe and is used for processing the detection signal to obtain a hydrogen content value in the transformer; and the background equipment is in signal connection with the output end of the signal processing circuit and is used for outputting alarm information for prompting when the hydrogen content value exceeds the standard. Detection device in this scheme can output testing result and alarm information in real time, has improved detection efficiency, has avoided causing the influence to the safe operation of oil charge electrical equipment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. The utility model provides a detection device of transformer oil, is applied to oil-filled electrical equipment which characterized in that, hydrogen detection device includes:
the probe is arranged in the transformer oil filled with the electrical equipment and comprises a hydrogen-sensitive sensor, and the hydrogen-sensitive sensor is used for detecting the content of hydrogen in the transformer oil and outputting a detection signal;
the signal processing circuit is in signal connection with the probe and is used for processing the detection signal to obtain a hydrogen content value in the transformer;
and the background equipment is in signal connection with the output end of the signal processing circuit and is used for outputting alarm information when the hydrogen content value exceeds the standard, and the alarm information is used for prompting operation and maintenance personnel that potential safety hazards exist in the electric equipment filled with the hydrogen.
2. The detection apparatus of claim 1, wherein the signal processing circuit comprises a processor and a digital communication interface, wherein:
the processor is used for processing the detection signal to obtain a hydrogen content value;
the digital communication interface is used for sending the hydrogen content value to the background equipment.
3. The hydrogen gas detecting device according to claim 2, wherein the processor comprises a DSP processor and an ARM processor.
4. A testing device according to claim 1 wherein said probe further comprises an oil temperature sensor.
5. A testing device according to claim 1 wherein said probe further comprises a micro-water sensor.
6. A testing device according to claim 1 wherein said probe further comprises a pressure sensor.
7. The sensing device of claim 1, wherein the probe further comprises a temperature controller, wherein:
the temperature controller is used for keeping the temperature of the environment where the hydrogen sensitive sensor is located within a preset temperature range.
8. The sensing device of claim 7, wherein the temperature controller further comprises a temperature sensor and a heater.
9. An oil-filled electrical apparatus, characterized in that a detection device according to any one of claims 1 to 8 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010309533.3A CN111474328A (en) | 2020-04-20 | 2020-04-20 | Transformer oil detection device and oil-filled electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010309533.3A CN111474328A (en) | 2020-04-20 | 2020-04-20 | Transformer oil detection device and oil-filled electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111474328A true CN111474328A (en) | 2020-07-31 |
Family
ID=71754029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010309533.3A Pending CN111474328A (en) | 2020-04-20 | 2020-04-20 | Transformer oil detection device and oil-filled electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111474328A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609126A (en) * | 2019-11-01 | 2019-12-24 | 国网江苏省电力有限公司电力科学研究院 | Online monitoring system for hydrogen in mutual inductor and method for judging internal fault of mutual inductor |
| CN113970070A (en) * | 2021-09-28 | 2022-01-25 | 北京格睿能源科技有限公司 | Method and device for detecting and positioning hydrogen leakage of liquid hydrogen and cryogenic gas |
| CN114123481A (en) * | 2021-06-30 | 2022-03-01 | 国网福建省电力有限公司 | Transformer substation high-voltage cable oil-filled terminal air-separation detection alarm system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749223A (en) * | 2015-04-15 | 2015-07-01 | 海卓赛思（苏州）传感技术有限公司 | Hydrogen gas sensor for monitoring concentration of hydrogen gas of oil-immersed transformer in online manner and using method thereof |
| CN109211309A (en) * | 2018-08-15 | 2019-01-15 | 国网陕西省电力公司电力科学研究院 | Hydrogen, micro- water and oil pressure comprehensive on-line monitoring apparatus are dissolved in oil-filled equipment oil |
-
2020
- 2020-04-20 CN CN202010309533.3A patent/CN111474328A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749223A (en) * | 2015-04-15 | 2015-07-01 | 海卓赛思（苏州）传感技术有限公司 | Hydrogen gas sensor for monitoring concentration of hydrogen gas of oil-immersed transformer in online manner and using method thereof |
| CN109211309A (en) * | 2018-08-15 | 2019-01-15 | 国网陕西省电力公司电力科学研究院 | Hydrogen, micro- water and oil pressure comprehensive on-line monitoring apparatus are dissolved in oil-filled equipment oil |
Non-Patent Citations (2)
| Title |
|---|
| H2SENSE123: "传统氢气传感器不专一？试试什么叫钯合金薄膜传感技术", 《电子工程世界》 * |
| 罗沙 等: "安全壳内氢气浓度测量技术及其应用综述", 《舰船科学技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609126A (en) * | 2019-11-01 | 2019-12-24 | 国网江苏省电力有限公司电力科学研究院 | Online monitoring system for hydrogen in mutual inductor and method for judging internal fault of mutual inductor |
| CN114123481A (en) * | 2021-06-30 | 2022-03-01 | 国网福建省电力有限公司 | Transformer substation high-voltage cable oil-filled terminal air-separation detection alarm system and method |
| CN114123481B (en) * | 2021-06-30 | 2023-06-27 | 国网福建省电力有限公司 | Transformer substation high-voltage cable oil-filled terminal space-isolation detection alarm system and method |
| CN113970070A (en) * | 2021-09-28 | 2022-01-25 | 北京格睿能源科技有限公司 | Method and device for detecting and positioning hydrogen leakage of liquid hydrogen and cryogenic gas |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111474328A (en) | Transformer oil detection device and oil-filled electrical equipment | |
| Chatterjee et al. | Usage of nanotechnology based gas sensor for health assessment and maintenance of transformers by DGA method | |
| CN109211309B (en) | Integrated on-line monitoring device for dissolved hydrogen, micro-water and oil pressure in oil of oil charging equipment | |
| CN103765167B (en) | The combination of hydrogen and pressure sensor | |
| CN108956957A (en) | A kind of hydrogen gas sensor for oil dissolved gas detection | |
| CN111007366A (en) | Oil type casing hidden danger monitoring system and method | |
| CN100410654C (en) | Online resistance-capacitance type method and apparatus for detecting micro-water in sulphur hexafluoride | |
| EP2411784A1 (en) | An improved online incipient fault sensor device for detection of incipient fault in oil-filled electrical apparatus such as a transformer | |
| CN203551526U (en) | Transformer oil chromatogram monitoring system based on internet-of-things technology | |
| CN211179666U (en) | Maintenance-free online monitoring device for dissolved gas in oil | |
| CN204241498U (en) | The monitoring device of transformer oil stream flow velocity | |
| CN100454009C (en) | Nano fluid heat conductivity tester | |
| CN201497796U (en) | Relay protection detector | |
| CN110987226A (en) | Dry-type reactor overheating fault early warning system based on distributed optical fiber sensing | |
| CN102590419A (en) | Device used for analyzing mixed gas in expansion tank of power transformer and based on gas chromatographic technology | |
| CN202404201U (en) | Thermal service life on-line monitoring system for oil-immersed power transformer | |
| CN113447781A (en) | Pressure-hydrogen-temperature three-in-one comprehensive detection system and detection method for oiled paper condenser type casing | |
| CN102589747A (en) | Method for monitoring top-layer oil temperature of oil-immersed power transformer based on optical fiber Bragg grating | |
| CN202471666U (en) | Mixed gas analytical equipment in power transformer oil breather based on gas chromatographic technology | |
| WO2003075294A1 (en) | On-line detection and measurement system for gases in oil-filled electrical equipment | |
| CN202869691U (en) | Adjustable optical fiber Bragg grating sensor for monitoring temperature of top oil of oil-immersed power transformer | |
| CN204065006U (en) | A kind of portable dissolved oxygen analyzer | |
| CN202547823U (en) | Adjustable optical fiber Bragg grating sensor for monitoring temperature of top oil of oil-immersed power transformer | |
| CN202330387U (en) | Multifunctional sampling probe | |
| CN102081064A (en) | Monitoring system of micro-water in transformer oil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200731 |