CN102768080A - Oil-immersed power transformer top layer oil temperature monitoring method based on thermosensitive resistance - Google Patents
Oil-immersed power transformer top layer oil temperature monitoring method based on thermosensitive resistance Download PDFInfo
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- CN102768080A CN102768080A CN2012102351770A CN201210235177A CN102768080A CN 102768080 A CN102768080 A CN 102768080A CN 2012102351770 A CN2012102351770 A CN 2012102351770A CN 201210235177 A CN201210235177 A CN 201210235177A CN 102768080 A CN102768080 A CN 102768080A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 52
- 229910052802 copper Inorganic materials 0.000 description 13
- 239000010949 copper Substances 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 238000007789 sealing Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 4
- 229920006362 Teflon® Polymers 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 239000010754 BS 2869 Class F Substances 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention relates to an oil-immersed power transformer top layer oil temperature monitoring method based on thermosensitive resistance and belongs to the technical field of photoelectron measurement. According to the method, firstly, a thermosensitive resistance temperature sensor is connected with a universal meter, and the thermosensitive resistance temperature sensor is inserted into top layer oil of a transformer through a test hole of the oil-immersed power transformer; after the temperature sensor is stable, the resistance value of a thermosensitive resistor is measured by the universal meter; then, the top layer oil temperature of the oil-immersed power transformer is calculated through a resistance and temperature change relational expression; and finally, the measured temperature is compared with the temperature rise standard of the oil-immersed power transformer, and whether the oil-immersed power transformer is under the normal work condition or not can be judged. The method has the advantages that the thermosensitive resistance temperature sensor can be inserted into the top layer oil of the oil-immersed power transformer for a long time, and the temperature of the top layer oil of the oil-immersed power transformer can be detected in real time; and the structure is simple, and the operation is convenient.
Description
Technical field
The present invention relates to a kind of oil-immersed power transformer top-oil temperature degree monitoring method, belong to the photoelectron field of measuring technique based on thermistor.
Background technology
Oil-immersed power transformer is one of nucleus equipment of Operation of Electric Systems; And the height of oil-immersed power transformer oil temperature is directly connected to the serviceable life of oil-immersed power transformer and the security of operation of power transmission and transformation system, therefore needs each electric substation that the temperature of oil-immersed power transformer oil is monitored.The insulativity of oil-immersed power transformer is relevant with the temperature of ageing rate and oil-immersed power transformer oil; The allowable value that surpasses temperature not only can reduce the operation life of oil-immersed power transformer, also can the safe operation of oil-immersed power transformer be threatened.In relevant national standard, temperature rise limits value or the hot(test)-spot temperature of oil-immersed power transformer under the load running situation done relevant provisions.Oil-immersed power transformer standard GB 1094.2-1996 " temperature rise of power transformer part 2 " has stipulated that for the transformer that adopts the A class F insulating material F, oil is not upgraded to 60K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts; Oil is upgraded to 55K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts, and the temperature rise standard of China's oil-immersed power transformer all is as the criterion for 40 degrees centigrade with environment temperature.The temperature of the top layer oil of monitoring oil-immersed power transformer; Can understand the ruuning situation of oil-immersed power transformer; Temperature to top layer oil is carried out field monitoring, to realizing the safe operation of electric system, and then economic development, social stability is all had important practical sense.
Summary of the invention
The present invention relates to a kind of oil-immersed power transformer top-oil temperature degree monitoring method based on thermistor, utilize the influence of temperature to the resistance value of thermistor, realize the real time on-line monitoring to the oil-immersed power transformer internal temperature, accuracy is high.
The present invention realizes through following technical scheme: at first be connected thermistor temperature sensor with multimeter 11, thermistor temperature sensor is inserted in the top layer oil of oil-immersed power transformer 12 through test hole 13; After waiting to stablize, measure the resistance value of thermistor according to multimeter; Through resistance and variation of temperature relational expression
, calculate the temperature of oil-immersed power transformer top layer oil then; Compare the temperature rise standard of measured temperature and oil-immersed power transformer at last, can judge whether oil-immersed power transformer is in normal operation.
The mathematics model analysis of the resistance value of described thermistor temperature sensor and temperature variation relation is following:
For thermistor, resistance
RWith temperature
tFunction such as formula (1):
(1) both sides with divided by
R 0 Can get:
(2) shift to and can get:
The then variation of oil-immersed power transformer oil temperature:
Described oil-immersed power transformer standard GB 1094.2-1996 " temperature rise of power transformer part 2 " regulation: for the transformer that adopts the A class F insulating material F, oil is not upgraded to 60K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts; Oil is upgraded to 55K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts, and the temperature rise standard of China's oil-immersed power transformer all is as the criterion for 40 degrees centigrade with environment temperature; According to this regulation; If oil does not surpass 95K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts above 100 K or oil-immersed power transformer top-oil temperature oily and that atmosphere directly contacts, can judge that this oil-immersed power transformer is in abnormal operating state.
Described thermistor temperature sensor be inserted into the top layer of oil-immersed power transformer oily the degree of depth with just fully the submergence thermistor temperature sensor be advisable; Thermistor temperature sensor can be inserted in the top layer oil of oil-immersed power transformer for a long time, and thermistor (temperature) sensor is preferably platinum sensor.
Described thermistor temperature sensor, multimeter, oil-immersed power transformer are commercially available common components.
The selection of said temperature measurement location: because the oil in the oil-immersed power transformer is under the driving of the temperature difference or oil pump; The inside and outside oil duct of each winding of process from the bottom; Flow through the top; Thereby top-oil temperature is the reflection of the temperature converged of each several part oil, also is the maximum temperature in the oil-immersed power transformer oil; So through the top layer temperature of monitoring oil-immersed power transformer oil, can grasp the operation conditions of oil-immersed power transformer more all sidedly, avoid fault, and finally caused cable fire, partial electric grid paralysis because of the overheated initiation of oil temperature.
Principle of work of the present invention: thermistor temperature sensor is inserted in the top layer oil through the test hole of oil-immersed power transformer, guarantees that thermistor temperature sensor can detect the temperature of the top layer oil of oil-immersed power transformer; When oil-immersed power transformer produces great amount of heat because of contact loose contact, magnetic circuit fault, conductor failure and other reasons; Be delivered to thermistor temperature sensor through oil-immersed power transformer oil; Cause the resistance value mode of thermistor temperature sensor to change, finally reach the purpose that the temperature of oil-immersed power transformer oil is monitored in real time.
Beneficial effect of the present invention:
1, adopt the thermistor temperature sensor means to measure, volume is little, corrosion-resistant, accuracy is high;
2, thermistor temperature sensor can be inserted in the top layer oil of oil-immersed power transformer for a long time, can detect the temperature of the top layer oil of oil-immersed power transformer in real time;
3, the present invention is simple in structure, is convenient to operation.
Description of drawings
Fig. 1 is installed in the synoptic diagram on the oil-immersed power transformer for thermistor of the present invention;
Fig. 2 is the embodiment of the invention 2 used thermistor temperature sensor structural representations;
Among the figure: the test hole of 1-thermistor, 2-copper pipe, the threaded copper pipe of 3-, 4-copper packing, 5-fluorine silica gel sealing ring, 6-nut, 7-line hole, 8-lead line, 9-handle, 10-teflon sleeve, the universal table of 11-, 12-oil-immersed power transformer, 13-oil-immersed power transformer.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further:
Embodiment 1: as shown in Figure 1: this is based on the oil-immersed power transformer top-oil temperature degree monitoring method of thermistor; Be at first to be connected thermistor temperature sensor with multimeter 11, thermistor temperature sensor is inserted in the top layer oil of oil-immersed power transformer 12 through test hole 13; Treat stable after, the thermistor resistance of measuring according to multimeter; Through resistance and variation of temperature relational expression
, calculate the temperature of oil-immersed power transformer top layer oil then; Compare the temperature rise standard of measured temperature and oil-immersed power transformer at last, can judge whether oil-immersed power transformer is under the normal operation.
Oil-immersed power transformer standard GB 1094.2-1996 " temperature rise of power transformer part 2 " regulation: for the transformer that adopts the A class F insulating material F, oil is not upgraded to 60K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts; Oil is upgraded to 55K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts, and the temperature rise standard of China's oil-immersed power transformer all is as the criterion for 40 degrees centigrade with environment temperature; According to this regulation; If oil does not surpass 95K with the oil-immersed power transformer top-oil temperature that atmosphere directly contacts above 100 K or oil-immersed power transformer top-oil temperature oily and that atmosphere directly contacts, can judge that this oil-immersed power transformer is in abnormal operating state.
The thermistor temperature sensor of this method adopts common commercial elements; Thermistor temperature sensor be inserted into the top layer of oil-immersed power transformer oily the degree of depth with just fully the submergence thermistor temperature sensor be advisable; Thermistor temperature sensor can be inserted in the top layer oil of oil-immersed power transformer for a long time, to realize the real-time detection to oil-immersed power transformer.
Embodiment 2: as shown in Figure 1: this concrete grammar based on the oil-immersed power transformer top-oil temperature degree monitoring method of thermistor is identical with embodiment 1 with process.In order to realize this method better; Adopted a kind of adjustable thermistor temperature sensor in the present embodiment, as shown in Figure 2: it is made up of thermistor 1, copper pipe 2, threaded copper pipe 3, copper packing 4, fluorine silica gel sealing ring 5, nut 6, line hole 7, lead line 8, handle 9, teflon sleeve 10, universal table 11; The structure that copper pipe 2, threaded copper pipe 3 and handle 9 are formed in one, and in machined line hole 7, copper pipe 2 bottoms seal; Be with copper packing 4, fluorine silica gel sealing ring 5 and nut 6 on the externally threaded copper pipe 3 successively being with; Logical cable-through hole 7; Thermistor 1 is placed 7 bottoms, online hole, and protects transmission lines with teflon sleeve 10, and overlaps line-entering hole 7 to an end of teflon sleeve 10 slightly; Realize leveling, sealing, seamless connection, lead line 8 is connected with multimeter 11.
Stipulate that transformer should be equipped with base in the oily temperature temperature measuring equipment of China about oil-immersed power transformer.Base should be located at the top of fuel tank, and stretch in the oil be 120
10mm.The present invention designs adjustable thermistor (temperature) sensor can be through threaded copper pipe 3, copper packing 4, fluorine silica gel sealing ring 5 and nut 6; The degree of depth of oil-immersed power transformer oil is stretched in adjusting; Both can satisfy national standard; Can guarantee that again the object of measuring is the top-oil temperature of oil-immersed power transformer, guarantee the accuracy of measuring.
The present invention describes through the practical implementation process; Without departing from the present invention; Can also carry out various conversion and be equal to replacement patent of invention; Therefore, patent of the present invention is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the Patent right requirement scope of the present invention.
Claims (5)
1. oil-immersed power transformer top-oil temperature degree monitoring method based on thermistor; It is characterized in that: at first be connected thermistor temperature sensor with multimeter, thermistor temperature sensor is inserted in the top layer oil of transformer through the test hole of oil-immersed power transformer; After waiting to stablize, measure the resistance value of thermistor according to multimeter; Through resistance and variation of temperature relational expression
, calculate the temperature of oil-immersed power transformer top layer oil then; Temperature rise standard with measured gained temperature and oil-immersed power transformer compares at last, judges whether power transformer is in normal operation.
2. the oil-immersed power transformer top-oil temperature degree monitoring method based on thermistor according to claim 1; It is characterized in that: according to the temperature rise standard code of national transformer; The top-oil temperature of the oil-immersed power transformer that oil directly contact with atmosphere surpass 100 K, or oily and oil-immersed power transformer top-oil temperature that atmosphere directly contacts above 95K, can judge that promptly this oil-immersed power transformer is in abnormal operating state.
3. the oil-immersed power transformer top-oil temperature degree monitoring method based on thermistor according to claim 1 is characterized in that: described thermistor temperature sensor be inserted into oil-immersed power transformer top layer oil the degree of depth with just fully the submergence thermistor temperature sensor be advisable.
4. the oil-immersed power transformer top-oil temperature degree monitoring method based on thermistor according to claim 1, it is characterized in that: described thermistor temperature sensor can be inserted in the top layer oil of oil-immersed power transformer for a long time.
5. the oil-immersed power transformer top-oil temperature degree monitoring method based on thermistor according to claim 1, it is characterized in that: described thermistor (temperature) sensor is a platinum sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102351770A CN102768080A (en) | 2012-07-09 | 2012-07-09 | Oil-immersed power transformer top layer oil temperature monitoring method based on thermosensitive resistance |
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| CN2012102351770A CN102768080A (en) | 2012-07-09 | 2012-07-09 | Oil-immersed power transformer top layer oil temperature monitoring method based on thermosensitive resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103961066A (en) * | 2013-01-24 | 2014-08-06 | 重庆融海超声医学工程研究中心有限公司 | Temperature measurement method and temperature measurement device |
| CN114113836A (en) * | 2021-11-15 | 2022-03-01 | 中煤科工集团沈阳研究院有限公司 | Temperature rise experiment device and method for isolation transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040101027A1 (en) * | 2002-11-22 | 2004-05-27 | Mende Michael J. | Method of monitoring current probe transformer temperature |
| CN101949744A (en) * | 2010-09-06 | 2011-01-19 | 国网电力科学研究院武汉南瑞有限责任公司 | Fiber grating-based transformer internal temperature detection system |
| CN201964973U (en) * | 2010-12-17 | 2011-09-07 | 王群英 | Electric equipment detector |
| CN102589742A (en) * | 2012-02-22 | 2012-07-18 | 昆明理工大学 | Oil-immersed power transformer top-level oil temperature monitoring method based on thermistor |
-
2012
- 2012-07-09 CN CN2012102351770A patent/CN102768080A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040101027A1 (en) * | 2002-11-22 | 2004-05-27 | Mende Michael J. | Method of monitoring current probe transformer temperature |
| CN101949744A (en) * | 2010-09-06 | 2011-01-19 | 国网电力科学研究院武汉南瑞有限责任公司 | Fiber grating-based transformer internal temperature detection system |
| CN201964973U (en) * | 2010-12-17 | 2011-09-07 | 王群英 | Electric equipment detector |
| CN102589742A (en) * | 2012-02-22 | 2012-07-18 | 昆明理工大学 | Oil-immersed power transformer top-level oil temperature monitoring method based on thermistor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103961066A (en) * | 2013-01-24 | 2014-08-06 | 重庆融海超声医学工程研究中心有限公司 | Temperature measurement method and temperature measurement device |
| CN103961066B (en) * | 2013-01-24 | 2015-12-23 | 重庆融海超声医学工程研究中心有限公司 | A kind of temp measuring method and temperature measuring equipment |
| CN114113836A (en) * | 2021-11-15 | 2022-03-01 | 中煤科工集团沈阳研究院有限公司 | Temperature rise experiment device and method for isolation transformer |
| CN114113836B (en) * | 2021-11-15 | 2023-10-27 | 中煤科工集团沈阳研究院有限公司 | Temperature rise experimental device and method for isolation transformer |
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Application publication date: 20121107 |