CN102768082A - Oil immersed power transformer top layer oil temperature monitoring method based on fiber Bragg grating - Google Patents

Oil immersed power transformer top layer oil temperature monitoring method based on fiber Bragg grating Download PDF

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Publication number
CN102768082A
CN102768082A CN2012102351766A CN201210235176A CN102768082A CN 102768082 A CN102768082 A CN 102768082A CN 2012102351766 A CN2012102351766 A CN 2012102351766A CN 201210235176 A CN201210235176 A CN 201210235176A CN 102768082 A CN102768082 A CN 102768082A
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CN
China
Prior art keywords
oil
power transformer
immersed power
temperature
fiber bragg
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Application number
CN2012102351766A
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Chinese (zh)
Inventor
李川
李国民
王达达
张少泉
李建发
孙家禄
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昆明理工大学
云南电力试验研究院(集团)有限公司电力研究院
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Application filed by 昆明理工大学, 云南电力试验研究院(集团)有限公司电力研究院 filed Critical 昆明理工大学
Priority to CN2012102351766A priority Critical patent/CN102768082A/en
Publication of CN102768082A publication Critical patent/CN102768082A/en

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Abstract

The invention relates to an oil immersed power transformer top layer oil temperature monitoring method based on fiber Bragg grating and belongs to the technical field of photoelectronic measurement. The method comprises the following steps of: firstly, inserting a fiber Bragg grating temperature sensor connected with a spectrum analyzer into top layer oil through an oil immersed power transformer test hole; after stabilization, analyzing the change of wavelength values of the fiber Bragg rating reflection according to the spectrum analyzer, and then calculating the temperature of the top layer oil of the oil immersed power transformer through the relation between the shift of the fiber Bragg grating temperature sensor and the change of temperature; and finally, comparing the measured temperature and the temperature rise standard of the oil immersed power transformer, thereby determining whether the oil immersed power transformer is in normal work condition. The oil immersed power transformer top layer oil temperature monitoring method provided by the invention has the beneficial effect that by adopting the fiber Bragg grating sensor which can be inserted into the top layer oil of the oil immersed power transformer, the temperature of the top layer oil of the oil immersed power transformer is detected in real time; and the structure is simple and the operation is convenient.

Description

A kind of oil-immersed power transformer top-oil temperature degree monitoring method based on optical fiber Bragg raster

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 optical fiber Bragg raster.

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-filled transformer top-oil temperature that atmosphere directly contacts; Oil is upgraded to 55K with the oil-filled 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 method of the monitoring oil-immersed power transformer top-oil temperature degree based on optical fiber Bragg raster; Utilize the influence of the wavelength of temperature on fiber Bragg grating; Realization is to the real time on-line monitoring of oil-immersed power transformer internal temperature, and accuracy is high.

The present invention realizes through following technical scheme: at first a Fiber Bragg Grating Temperature sensor that is connected with spectroanalysis instrument, the test hole through oil-immersed power transformer is inserted in the top layer oil; After waiting to stablize; Analyze the variation of the wavelength value of optical fiber Bragg raster reflection according to spectroanalysis instrument; Through the displacement and the variation of temperature relation of Fiber Bragg Grating Temperature sensor wavelength, 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 this oil-immersed power transformer is in normal operation.

The top layer that described Fiber Bragg Grating Temperature sensor is inserted into oil-immersed power transformer oily the degree of depth with just fully submergence Fiber Bragg Grating Temperature sensor be advisable, the Fiber Bragg Grating Temperature sensor can be inserted in the top layer oil of oil-immersed power transformer for a long time.

The mathematics model analysis of the displacement of described Fiber Bragg Grating Temperature sensor wavelength and temperature variation relation is following:

The peak wavelength that reflects satisfies:

(1)

(1) formula is carried out the temperature T differentiate can be got:

(2)

(2) the formula both sides can obtain divided by (1) formula:

(3)

is the temperature coefficient of sensor in (3) formula; is wavelength change, be the thermal expansion system of optical fiber.So the displacement and the variation of temperature of fiber-optical grating temperature sensor Bragg wavelength are linear.

The then variation of oil-immersed power transformer oil temperature:

(4)

Described oil-immersed power transformer standard GB 1094.2-1996 " temperature rise of power transformer part 2 " regulation: for the oil-immersed power 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 defeated the device top-oil temperature with the oil immersed type power transformation that atmosphere directly contacts and is upgraded to 55K, 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 Fiber Bragg Grating Temperature sensor, spectroanalysis instrument, 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; From the bottom through the inside and outside oil duct of each winding; 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: the Fiber Bragg Grating Temperature sensor is inserted in the top layer oil of oil-immersed power transformer through the test hole of oil-immersed power transformer, guarantees that 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; Oil through oil-immersed power transformer is delivered to optical fiber Bragg raster; Cause the displacement of optical fiber Bragg raster reflection wavelength, 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 optical fiber Bragg raster means to measure, volume is little, bandwidth is wide, anti-electromagnetic interference capability is strong and corrosion-resistant outside, Wavelength-encoding has absolute measurement, accuracy is high;

2, optical fiber Bragg grating 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 of oil-immersed power transformer for the fiber Bragg temperature sensor;

Fig. 2 is a kind of fiber Bragg arrangement of temperature sensor synoptic diagram provided by the invention.

Among the figure: the test hole of 1-optical fiber Bragg raster, 2-copper pipe, the threaded copper pipe of 3-, 4-copper packing, 5-fluorine silica gel sealing ring, 6-nut, 7-optical fiber fairlead, 8-optical fiber, 9-handle, 10-teflon sleeve, 11-spectroanalysis instrument, 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:

As shown in Figure 1: at first a Fiber Bragg Grating Temperature sensor that is connected with spectroanalysis instrument, the test hole through oil-immersed type power is inserted in the top layer oil; After waiting to stablize; Analyze the variation of the wavelength value of optical fiber Bragg raster reflection according to spectroanalysis instrument; Through the displacement and the variation of temperature relation of Fiber Bragg Grating Temperature sensor wavelength, 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 this oil-immersed power transformer is in normal operation.

Described Fiber Bragg Grating Temperature sensor be inserted into oil-immersed power transformer top layer oil the degree of depth with just fully submergence Fiber Bragg Grating Temperature sensor be advisable; The Fiber Bragg Grating 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.

Described Fiber Bragg Grating Temperature sensor can adopt commercially available common components.

In order to realize this method better; The present invention has designed a kind of adjustable optical fiber Bragg temperature sensor, and is as shown in Figure 2: sensor comprises optical fiber Bragg raster 1, copper pipe 2, threaded copper pipe 3, copper packing 4, fluorine silica gel sealing ring 5, nut 6, optical fiber fairlead 7, optical fiber 8, handle 9, teflon sleeve 10, spectroanalysis instrument 11 compositions; The structure that copper pipe 2, threaded copper pipe 3 and handle 9 are formed in one, and at machined optical fiber fairlead 7, copper pipe 2 bottoms are sealings; Be with copper packing 4, fluorine silica gel sealing ring 5 and nut 6 on the externally threaded copper pipe 3 successively being with; Through optical fiber fairlead 7; Optical fiber Bragg raster 1 is free unsettled in optical fiber fairlead 7 bottoms; And with the exposed optical fiber of teflon sleeve 10 protections; And be inserted in optical fiber fairlead 7 to an end of teflon sleeve 10 slightly, realize leveling, sealing, seamless connection, the part that optical fiber 8 is drawn is connected with spectroanalysis instrument 11.

Because an end freedom of optical fiber Bragg raster 1 is unsettled, so the thermal expansion of encapsulating material can not cause the variation of reflection wavelength, has avoided the influence of ambient temperature to measurement result.Because elasto-optical effect and waveguiding effect do not have remarkable influence to the wavelength of fiber grating, only, cause the reflection peak wavelength change through the thermal expansion effects and the optical fiber thermo-optic effect of optical fiber.

Simultaneously owing to 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 Fiber Bragg Grating Temperature sensor is installed on transformer inside; In the process of installing, be not easy to observe, a kind of adjustable optical fiber Bragg temperature sensor that therefore adopts the present invention to design 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 goed deep in adjusting; Both can satisfy national standard, can guarantee again that the object of measuring was 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 (4)

1. oil-immersed power transformer top-oil temperature degree monitoring method based on optical fiber Bragg raster; It is characterized in that: at first a Fiber Bragg Grating Temperature sensor that is connected with spectroanalysis instrument, the test hole through oil-immersed power transformer is inserted in the top layer oil; After waiting to stablize; Analyze the variation of the wavelength value of optical fiber Bragg raster reflection according to spectroanalysis instrument; Through the displacement and the variation of temperature relation of Fiber Bragg Grating Temperature sensor wavelength, calculate the temperature of oil-immersed power transformer top layer oil; The temperature rise standard that to measure gained temperature and oil-immersed power transformer at last compares, and judges whether oil-immersed power transformer is in normal operating conditions.
2. the oil-immersed power transformer top-oil temperature degree monitoring method based on optical fiber Bragg raster according to claim 1; It is characterized in that: according to the temperature rise standard code of national oil-immersed power transformer; 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.
3. the oil-immersed power transformer top-oil temperature degree monitoring method based on optical fiber Bragg raster according to claim 1, it is characterized in that: described Fiber Bragg Grating Temperature sensor can be inserted in the top layer oil of oil-immersed power transformer for a long time.
4. the oil-immersed power transformer top-oil temperature degree monitoring method based on optical fiber Bragg raster according to claim 1 is characterized in that: described Fiber Bragg Grating Temperature sensor be inserted into oil-immersed power transformer top layer oil the degree of depth with just fully submergence Fiber Bragg Grating Temperature sensor be advisable.
CN2012102351766A 2012-07-09 2012-07-09 Oil immersed power transformer top layer oil temperature monitoring method based on fiber Bragg grating CN102768082A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103616408A (en) * 2013-11-19 2014-03-05 昆明理工大学 Catalytic combustion type gas concentration meter based on optical fiber Bragg grating and application method thereof
CN104034442A (en) * 2013-12-31 2014-09-10 江苏有能电力自动化有限公司 Transformer oil temperature online monitoring device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1134566A1 (en) * 2000-03-14 2001-09-19 MASCHINENFABRIK REINHAUSEN GmbH Method for measuring temperature by optical fibre and optical fibre temperature sensor
CN101639386A (en) * 2009-09-08 2010-02-03 江苏省电力公司南京供电公司 Load tap changer contact overheating fault diagnosis method and device
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
CN102589747A (en) * 2012-02-22 2012-07-18 昆明理工大学 Method for monitoring top-layer oil temperature of oil-immersed power transformer based on optical fiber Bragg grating

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1134566A1 (en) * 2000-03-14 2001-09-19 MASCHINENFABRIK REINHAUSEN GmbH Method for measuring temperature by optical fibre and optical fibre temperature sensor
CN101639386A (en) * 2009-09-08 2010-02-03 江苏省电力公司南京供电公司 Load tap changer contact overheating fault diagnosis method and device
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
CN102589747A (en) * 2012-02-22 2012-07-18 昆明理工大学 Method for monitoring top-layer oil temperature of oil-immersed power transformer based on optical fiber Bragg grating

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
曾凡超等: "光纤光栅测温在变压器油温监测中的应用", 《变压器技术》, no. 7, 31 July 2009 (2009-07-31), pages 12 - 13 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103616408A (en) * 2013-11-19 2014-03-05 昆明理工大学 Catalytic combustion type gas concentration meter based on optical fiber Bragg grating and application method thereof
CN104034442A (en) * 2013-12-31 2014-09-10 江苏有能电力自动化有限公司 Transformer oil temperature online monitoring device

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Application publication date: 20121107