CN113866213A - Transformer oil local temperature rise simulation test device based on laser heating principle - Google Patents
Transformer oil local temperature rise simulation test device based on laser heating principle Download PDFInfo
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- CN113866213A CN113866213A CN202111083729.6A CN202111083729A CN113866213A CN 113866213 A CN113866213 A CN 113866213A CN 202111083729 A CN202111083729 A CN 202111083729A CN 113866213 A CN113866213 A CN 113866213A
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Abstract
The invention discloses a laser heating principle-based transformer oil local temperature rise simulation test device, wherein in a test device, a container contains transformer oil; the laser emits laser, a target body is immersed in the transformer oil, a lens is arranged between the laser and the target body to focus the laser on the target body, and the target body locally heats the transformer oil under the irradiation of the laser; the temperature measuring probe is immersed in the transformer oil, and the temperature measuring unit is connected with the temperature measuring probe to generate full-time temperature data.
Description
Technical Field
The invention belongs to the technical field of transformer testing, and particularly relates to a transformer oil local temperature rise simulation testing device based on a laser heating principle.
Background
The transformer is indispensable equipment in electric energy conversion and transmission among the electric power system, and its reliable operation is whole electric power system's safety and stability's assurance, and the oil-immersed power transformer in the operation in-process can appear local high temperature under unusual operating mode or insulating defect condition, and insulating oil can take place to decompose and form a large amount of gas products under high temperature to make the insulation inefficacy, lead to equipment trouble. In order to avoid the occurrence of serious overheating faults in oil, a characteristic rule before the fault is formed needs to be monitored, and possible faults are early warned in advance.
The prior early warning means for the overheating fault of the transformer comprises two means of temperature monitoring and fault decomposition gas monitoring. On one hand, the change of the oil temperature is monitored through a temperature sensor, the change trend of the oil temperature is predicted by combining the load condition of a transformer, and early warning is given when the oil temperature reaches a threshold value; on the other hand, by monitoring the types, the contents and the gas production rate of the dissolved gas in the oil on line, when the contents of certain gases are too high or the gas production rate is large, corresponding monitoring equipment can give out fault early warning. For the temperature monitoring means, because the structure of the transformer is complex, the distribution of the internal temperature and the change rule of the hot spot temperature are influenced by loads and other various factors, the existing monitoring means can only monitor the surface temperature of the transformer box body or the oil temperature of the top layer or the bottom layer in the transformer box body, and the conditions of local overheating and the like are difficult to reflect; the type and the speed of the fault decomposed gas are closely related to the severity of local overheating, and the fault decomposed gas is an important means for early warning of the overheating fault, but the law of the decomposed gas under different types and degrees of the overheating fault needs to be accurately mastered, so that a local temperature rise simulation experiment of the transformer oil needs to be carried out, the decomposed gas in the simulation experiment is subjected to component analysis, and the correlation between the overheating fault and the decomposed gas is established.
Summarizing the conventional insulating oil overheating simulation method, the method mainly comprises oven heating, electric coil heating, heating by a heating furnace, alcohol lamp heating and the like, and the method is usually difficult to realize the simulation of the insulating oil high-temperature overheating fault at the temperature of more than 700 ℃, so that the method for simulating the insulating oil high-temperature overheating fault needs to be researched for researching the gas decomposition rule of the insulating oil under the high-temperature overheating fault.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The invention provides a transformer oil local temperature rise simulation test device based on a laser heating principle, aiming at the problems of uniform heating and the like in the prior art. The oil sample local heating is realized through laser heating, and the fault that the local hot spot temperature is too high in the online operation of the transformer can be accurately simulated. The device can realize the simulation of the high-temperature overheating fault of the insulating oil at the temperature of more than 700 ℃.
The invention aims to realize the technical proposal that a simulation test device for the local temperature rise of transformer oil based on the laser heating principle comprises,
a container containing transformer oil;
a temperature-rise module comprising, in combination,
a laser, which emits a laser light,
a target body immersed in the transformer oil,
a lens arranged between the laser and the target body to focus the laser on the target body, wherein the target body locally heats transformer oil under the irradiation of the laser;
a measurement module comprising, in combination,
a temperature measuring probe immersed in the transformer oil,
and the temperature measuring unit is connected with the temperature measuring probe to generate full-time temperature data.
In the laser heating principle-based transformer oil local temperature rise simulation testing device, the temperature measuring probe can be movably immersed in the transformer oil to adjust the distance between the temperature measuring probe and the target body.
In the transformer oil local temperature rise simulation testing device based on the laser heating principle, the testing device further comprises a control unit which is connected with the laser to adjust working parameters of the laser.
In the transformer oil local temperature rise simulation testing device based on the laser heating principle, the testing device further comprises a processing unit which is connected with the temperature measuring unit to generate temperature curves at different distances.
In the laser heating principle-based transformer oil local temperature rise simulation testing device, the target body is a copper material, and the copper material absorbs laser photon energy and converts the laser photon energy into lattice thermal oscillation.
In the local temperature rise simulation testing device of transformer oil based on the laser heating principle, the testing device further comprises a protection module arranged on one side of the container opposite to the laser, and the protection module comprises a metal plate.
In the transformer oil local temperature rise simulation testing device based on the laser heating principle, the container is of a transparent organic glass structure.
In the transformer oil local temperature rise simulation testing device based on the laser heating principle, the output wavelength of the laser is 1064nm, and the pulse width is 0.5-2.5 ms.
In the laser heating principle-based transformer oil local temperature rise simulation testing device, the container is provided with a ventilation device for exhausting gas.
In the transformer oil local temperature rise simulation testing device based on the laser heating principle, the temperature-measuring probe can resist the temperature of more than 1000 ℃, and the reaction time of the temperature-measuring unit is millisecond level.
Compared with the prior art, the invention has the following advantages:
according to the invention, the temperature change rule of the transformer oil near the hot point of the transformer can be simulated by locally heating the transformer oil, and the transformer oil can be used as a reference platform for a local temperature rise test of the transformer. The principle of laser heating is utilized in the method, other positions of the transformer oil are prevented from being heated as far as possible, and the reduction degree of the transformer oil near the hot point temperature under the actual working condition is high. The method and the device have high expandability, can customize the experiment cavity according to different experiment requirements, and have high adaptability.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic structural diagram of an intelligent laser heating principle-based transformer oil local temperature rise simulation testing device.
The invention is further explained below with reference to the figures and examples.
Detailed Description
A specific embodiment of the present invention will be described in more detail below with reference to fig. 1. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1, the simulation test device for local temperature rise of transformer oil based on laser heating principle comprises,
a container 1 that contains transformer oil;
a temperature-rise module comprising, in combination,
a laser 2, which emits laser light,
a target body 3 immersed in the transformer oil,
a lens 4 disposed between the laser 2 and the target 3 to focus the laser on the target 3, wherein the target 3 locally heats transformer oil under irradiation of the laser;
a measurement module comprising, in combination,
a temperature measuring probe 5 immersed in the transformer oil,
and the temperature measuring unit 6 is connected with the temperature measuring probe 5 to generate full-time temperature data.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the temperature measuring probe 5 is movably immersed in the transformer oil to adjust the distance between the temperature measuring probe and the target body 3. Optionally, the container 1 is provided with a testing hole at the bottom, so that the temperature measuring module can conveniently monitor the oil temperature near the measured oil sample.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the test device further comprises a control unit 7 which is connected with the laser 2 to adjust the working parameters of the laser.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the test device further comprises a processing unit 8 which is connected with the temperature measuring unit 6 to generate temperature curves at different distances.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the target body 3 is a copper material, and the copper material absorbs laser photon energy and converts the laser photon energy into lattice thermal oscillation.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the test device further comprises a protection module 9 arranged on one side of the container 1 opposite to the laser 2, and the protection module 9 comprises a metal plate. The protection module 9 adopts a thick metal plate to prevent the laser from puncturing the target material and then ablating the rear article.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the container 1 is of a transparent organic glass structure.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the output wavelength of the laser 2 is 1064nm, and the pulse width is 0.5-2.5 ms.
In the preferred embodiment of the simulation test device for the local temperature rise of the transformer oil based on the laser heating principle, the container 1 is provided with a ventilation device for exhausting gas.
In the preferred embodiment of the transformer oil local temperature rise simulation test device based on the laser heating principle, the temperature measuring probe 5 can resist temperature of more than 1000 ℃, and the reaction time of the temperature measuring unit 6 is millisecond. Because the laser energy is higher and the increasing rate of the local oil temperature is too fast, the thermodetector adopts a high-speed acquisition device to acquire the real-time oil temperature.
In one embodiment, the simulation test device for the local temperature rise of the transformer oil based on the laser heating principle comprises,
the container 1 is a test tank body made of organic glass, and the interior of the container can be adaptively designed according to different test requirements and is used as a cavity for containing an oil sample to be tested in a test;
the temperature rise module comprises a laser 2, a lens 4 and a target body 3, and the laser is used for hitting the target body 3 to realize the local heating of the transformer oil;
the measuring module comprises a temperature measuring probe 5, a high-speed temperature measuring instrument and an upper computer, and realizes the full-time monitoring of the temperature of the transformer oil during the test;
and the protection module 9 is used for recovering laser which is not absorbed by the target body 3 and preventing other equipment and personnel from being damaged.
Preferably, the laser 2 has an output wavelength of 1064nm and a pulse width of 0.5-2.5ms, so as to be absorbed by the target 3.
Preferably, the temperature measuring probe 5 can bear the high temperature of more than 1000 ℃, and the experiment cavity is provided with a ventilation device which can smoothly discharge the gas generated by the heated transformer oil.
Preferably, the response time of the temperature measurement module is millisecond-level, so that the temperature rise rate of the local oil temperature during laser heating is met.
Preferably, the operating parameter includes laser power.
In order to further understand the invention, in one embodiment, the simulation test device for the local temperature rise of the transformer oil based on the laser heating principle comprises,
the container 1 is a test tank body made of organic glass, a copper target body 3 is placed in the container, and a test cavity is a cylindrical cavity and can contain 100ml of transformer oil as a test sample;
the transformer oil is not limited to mineral oil, can be applied to transformers, has enough insulating property, and can also be synthetic ester or vegetable oil;
the temperature rise module comprises a laser 2, a lens 4 and a target body 3, wherein laser is irradiated on the target body 3 to heat the target body 3, and the transformer oil near the target body 3 is heated through heat conduction, so that the purpose of local temperature rise of the transformer oil is achieved;
the measuring module comprises a temperature measuring probe 5, a high-speed temperature measuring instrument and an upper computer, and realizes the full-time monitoring of the temperature of the transformer oil during the test;
and the protection module 9 is used for recovering laser which is not absorbed by the target body 3 and preventing other equipment and personnel from being damaged.
Further, the testing device also comprises a composition analyzer for analyzing the composition of the transformer oil.
In the embodiment, due to the special heat production position of the transformer in operation, transformer oil is prone to thermal aging near the hot point, the transformer oil insulation performance is reduced due to aging, local defects occur in the transformer, and the local defects evolve into insulation failure faults along with the increase of the operation time, so that the transformer shutdown accidents are caused. According to the special operating environment of the transformer oil, the local temperature rise test platform of the transformer oil based on the laser heating principle is designed, the whole fault evolution process can be simulated by the platform, so that the characteristic quantity can be extracted from the fault evolution process by the same professional, the fault evolution monitoring of the transformer is realized, the insulation state of the transformer is reflected in time, the short-circuit accident of the transformer caused by the insulation failure of the transformer oil is greatly reduced, and the operation reliability of a power grid is improved.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A simulation test device for local temperature rise of transformer oil based on laser heating principle is characterized in that it comprises,
a container containing transformer oil;
a temperature-rise module comprising, in combination,
a laser, which emits a laser light,
a target body immersed in the transformer oil,
a lens arranged between the laser and the target body to focus the laser on the target body, wherein the target body locally heats transformer oil under the irradiation of the laser;
a measurement module comprising, in combination,
a temperature measuring probe immersed in the transformer oil,
and the temperature measuring unit is connected with the temperature measuring probe to generate full-time temperature data.
2. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 1, wherein preferably, the temperature measuring probe is movably immersed in the transformer oil to adjust the distance between the temperature measuring probe and the target body.
3. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 1, wherein the test device further comprises a control unit connected with the laser to adjust an operating parameter thereof.
4. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 2, wherein the test device further comprises a processing unit connected with the temperature measurement unit to generate temperature curves at different distances.
5. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 1, wherein the target body is a copper material, and the copper material absorbs laser photon energy and converts the laser photon energy into lattice thermal oscillation.
6. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 1, wherein the test device further comprises a protection module arranged on a side of the container opposite to the laser, and the protection module comprises a metal plate.
7. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 1, wherein the container is of a transparent organic glass structure.
8. The transformer oil local temperature rise simulation test device based on the laser heating principle as claimed in claim 1, wherein the output wavelength of the laser is 1064nm, and the pulse width is 0.5-2.5 ms.
9. The laser heating principle based transformer oil local temperature rise simulation test device according to claim 1, wherein the container is provided with a ventilation device for exhausting gas.
10. The laser heating principle-based transformer oil local temperature rise simulation test device according to claim 1, wherein the temperature measurement probe is resistant to temperature of more than 1000 ℃, and the reaction time of the temperature measurement unit is millisecond-level.
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| CN202111083729.6A CN113866213A (en) | 2021-09-15 | 2021-09-15 | Transformer oil local temperature rise simulation test device based on laser heating principle |
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| CN205748710U (en) * | 2016-01-25 | 2016-11-30 | 广东电网有限责任公司电力科学研究院 | Optical fiber temperature-measurement device and transformer oil paper insulation test system |
| CN106680308A (en) * | 2017-02-23 | 2017-05-17 | 四川大学 | Atmosphere laser heating in-situ thermal shock/fatigue test device |
| CN109188213A (en) * | 2018-08-16 | 2019-01-11 | 西安西电变压器有限责任公司 | A kind of power transformer interior fault imitative experimental appliance |
| CN110780165A (en) * | 2019-11-08 | 2020-02-11 | 西南交通大学 | Transformer winding overheating inter-turn insulation material degradation testing device and testing method |
| CN211785834U (en) * | 2019-12-10 | 2020-10-27 | 广西大学 | Uneven thermal aging simulation device for insulating paper |
| CN112630261A (en) * | 2020-12-11 | 2021-04-09 | 武汉大学 | Measuring device and measuring method for multiple thermophysical parameters of material |
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2021
- 2021-09-15 CN CN202111083729.6A patent/CN113866213A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205748710U (en) * | 2016-01-25 | 2016-11-30 | 广东电网有限责任公司电力科学研究院 | Optical fiber temperature-measurement device and transformer oil paper insulation test system |
| CN106680308A (en) * | 2017-02-23 | 2017-05-17 | 四川大学 | Atmosphere laser heating in-situ thermal shock/fatigue test device |
| CN109188213A (en) * | 2018-08-16 | 2019-01-11 | 西安西电变压器有限责任公司 | A kind of power transformer interior fault imitative experimental appliance |
| CN110780165A (en) * | 2019-11-08 | 2020-02-11 | 西南交通大学 | Transformer winding overheating inter-turn insulation material degradation testing device and testing method |
| CN211785834U (en) * | 2019-12-10 | 2020-10-27 | 广西大学 | Uneven thermal aging simulation device for insulating paper |
| CN112630261A (en) * | 2020-12-11 | 2021-04-09 | 武汉大学 | Measuring device and measuring method for multiple thermophysical parameters of material |
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