CN104515622A - Fiber bragg grating temperature measurement system of transformer - Google Patents

Fiber bragg grating temperature measurement system of transformer Download PDF

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Publication number
CN104515622A
CN104515622A CN201410826207.4A CN201410826207A CN104515622A CN 104515622 A CN104515622 A CN 104515622A CN 201410826207 A CN201410826207 A CN 201410826207A CN 104515622 A CN104515622 A CN 104515622A
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CN
China
Prior art keywords
temperature
transformer
bragg grating
fiber bragg
light source
Prior art date
Application number
CN201410826207.4A
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Chinese (zh)
Inventor
胡成军
王清亮
Original Assignee
国家电网公司
国网河北省电力公司
国网河北省电力公司邢台供电分公司
国网河北南和县供电公司
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Application filed by 国家电网公司, 国网河北省电力公司, 国网河北省电力公司邢台供电分公司, 国网河北南和县供电公司 filed Critical 国家电网公司
Priority to CN201410826207.4A priority Critical patent/CN104515622A/en
Publication of CN104515622A publication Critical patent/CN104515622A/en

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Abstract

The invention discloses a fiber bragg grating temperature measurement system of a transformer. The fiber bragg grating temperature measurement system comprises a PC (personal computer), a data acquisition card, a photoelectric detection signal amplifier, a sawtooth wave generator, an F-P filter, a coupler, a broadband light source, a light switch and a fiber bragg grating sensor array. The temperature in the transformer is detected by combining a fiber bragg grating temperature measurement theory and the PC, so that the problem of low precision due to an existing temperature measurement mode for the transformer can be solved, and the problem of abnormal temperature of a transformer winding can be found in time; meanwhile, whether the temperature of the transformer winding is normal can be judged according to the temperature of a measurement point and the temperature rise rate of the measurement point, so that the precision is higher, and the stability is higher.

Description

Transformer optical fiber grating temperature-measuring system

Technical field

The present invention relates to inside transformer temperature detection technical field, particularly relate to a kind of transformer optical fiber grating temperature-measuring system.

Background technology

Transformer Insulation Aging is one of factor affecting its life-span, and inside transformer temperature directly affects the speed of insulation ag(e)ing, therefore, Real-Time Monitoring is carried out to inside transformer temperature, takes when high temperature appears in inside transformer rational cooling measure to be the effective measures extending transformer serviceable life.

The detection technique that Transformer Winding on-line temperature monitoring is conventional mainly comprises infrared temperature-test technology, Thermistor Temperature Measurement technology and thermocouple temperature measurement technology etc., wherein infrared temperature-measuring intelligent is measured transformer surface temperature, measure structure and be easily subject to external interference, Thermistor Temperature Measurement technology and thermocouple temperature measurement technology are easily subject to the interference of electric system strong electromagnetic environment, thermometric poor effect, the precision of measurement result is difficult to be guaranteed.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of transformer optical fiber grating temperature-measuring system, the problem that existing transformer thermometric mode precision is low can be overcome, can the problem of Timeliness coverage Transformer Winding temperature anomaly, whether normally measuring point temperature and measuring point temperature rise rate can also be carried out half section of Transformer Winding temperature as foundation simultaneously, precision is higher, and stability is better.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of transformer optical fiber grating temperature-measuring system, comprise PC, data collecting card, photoelectric detecting signal amplifier, saw-toothed wave generator, F-P wave filter, coupling mechanism, wideband light source, photoswitch and Fiber Bragg Grating Sensor Array, institute's Fiber Bragg Grating Sensor Array is connected with photoswitch one end, other one section of described photoswitch is connected with coupling mechanism, described coupler input connects wideband light source, described coupler output connects F-P wave filter, described saw-toothed wave generator two ends connect F-P filter signal end respectively and photoelectric detecting signal amplifier compares end, described F-P filter output connects the signal input part of photoelectric detecting signal amplifier, described photoelectric detecting signal amplifier signal output terminal connection data capture card, described data collecting card output terminal connects PC data-interface.

Described coupling mechanism is three-dB coupler.

Between described wideband light source and coupling mechanism, isolator is set.

The model of described wideband light source is DL-BX-CS5169, and centre wavelength scope is 1530-1570nm; The model of described F-P wave filter is FFP-TF2, and wavelength band is 1260-1620nm, and the model of data collecting card is PCI-6133, and the model of light grating sensor is FBG-T-01, and operating wavelength range is 1510-1590nm.

The beneficial effect that produces of technique scheme is adopted to be: to be combined with PC by using optical fiber grating temperature-measuring principle and to detect inside transformer temperature, the problem that existing transformer thermometric mode precision is low can be overcome, can the problem of Timeliness coverage Transformer Winding temperature anomaly, whether normally measuring point temperature and measuring point temperature rise rate can also be carried out half section of Transformer Winding temperature as foundation simultaneously, precision is higher, and stability is better.

Accompanying drawing explanation

Fig. 1 is structure principle chart of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

Easily external interference is subject to for solving existing transformer temperature measurement mechanism, thermometric poor effect, the precision of measurement result is difficult to guaranteed problem, the invention discloses a kind of transformer optical fiber grating temperature-measuring system, it is characterized in that: comprise PC, data collecting card, photoelectric detecting signal amplifier, saw-toothed wave generator, F-P wave filter, coupling mechanism, wideband light source, photoswitch and Fiber Bragg Grating Sensor Array, institute's Fiber Bragg Grating Sensor Array is connected with photoswitch one end, other one section of described photoswitch is connected with coupling mechanism, described coupler input connects wideband light source, described coupler output connects F-P wave filter, described saw-toothed wave generator two ends connect-FP chamber signal end respectively and photoelectric detecting signal amplifier compares end, described F-P filter output connects the signal input part of photoelectric detecting signal amplifier, described photoelectric detecting signal amplifier signal output terminal connection data capture card, described data collecting card output terminal connects PC data-interface, described coupling mechanism is three-dB coupler, between described wideband light source and coupling mechanism, isolator is set, the model of described wideband light source is DL-BX-CS5169, and centre wavelength scope is 1530-1570nm, the model of described F-P wave filter is FFP-TF2, and wavelength band is 1260-1620nm, and the model of data collecting card is PCI-6133, and the model of light grating sensor is FBG-T-01, and operating wavelength range is 1510-1590nm.

Fiber grating utilizes the photosensitivity of light material, the measures such as uv-exposure are adopted to form space phase grating at fiber core, the effect of fiber-optic grating sensor is in fact in fibre core, form an arrowband projection filtering or catoptron, the direction of light back light incidence after optical grating reflection of specific wavelength, the temperature acting on grating place makes the cycle of grating and refractive index change, and then cause the change of wavelength of transmitted light, the change of temperature therefore can be recorded by the change of detection of reflected optical wavelength.

The present invention is described for 35KV oil-filled transformer, for obtaining the Temperature Distribution of inside transformer assembly, especially Obtaining Accurate hot spot temperature of winding, 14 optical fiber are arranged, totally 218 fiber-optic grating sensors at key positions such as 35 kV transformer model machine windings, stay, iron core and oil tops.Wherein, low pressure winding the from the 2nd to the 59th cake (totally 64 cakes) arranges a fiber-optic grating sensor every two cakes; In the middle of high pressure winding, the 27th to the 34th cake (totally 58 cakes) is high-voltage branching section, and fiber-optic grating sensor is not arranged in this section of region; A fiber-optic grating sensor arranged by the every cake of from the 37th to the 56th cake.6 optical fiber are successfully arranged, totally 89 fiber-optic grating sensors in winding.Longitudinally offer a little groove in the middle of stay inner surface fiber-optic grating sensor is imbedded, every bracing bars buries 10 fiber-optic grating sensors underground, adjacent two sensors spacing is 60 mm, successfully arranges 4 optical fiber totally 66 fiber-optic grating sensors in this model machine.Layout fiber-optic grating sensor unshakable in one's determination adopts surface-mount type, every phase core limb surface longitudinal arranges each 10 fiber-optic grating sensors of two row, two sensor series connection are drawn, and adjacent two sensors spacing is 70 mm, and iron core successfully arranges 3 optical fiber totally 53 fiber-optic grating sensors.10 fiber-optic grating sensors measuring top-oil temperature are suspended on the default support of case lid, and adjacent two sensors spacing is 70 mm, and mounted optical fiber is carried out online temperature test according to accompanying drawing join dependency equipment.

In a word, the present invention detects inside transformer temperature by using optical fiber grating temperature-measuring principle to be combined with PC, the problem that existing transformer thermometric mode precision is low can be overcome, can the problem of Timeliness coverage Transformer Winding temperature anomaly, whether normally measuring point temperature and measuring point temperature rise rate can also be carried out half section of Transformer Winding temperature as foundation simultaneously, precision is higher, and stability is better.

Claims (4)

1. a transformer optical fiber grating temperature-measuring system, it is characterized in that: comprise PC, data collecting card, photoelectric detecting signal amplifier, saw-toothed wave generator, F-P wave filter, coupling mechanism, wideband light source, photoswitch and Fiber Bragg Grating Sensor Array, institute's Fiber Bragg Grating Sensor Array is connected with photoswitch one end, other one section of described photoswitch is connected with coupling mechanism, described coupler input connects wideband light source, described coupler output connects F-P wave filter, described saw-toothed wave generator two ends connect F-P filter signal end respectively and photoelectric detecting signal amplifier compares end, described F-P filter output connects the signal input part of photoelectric detecting signal amplifier, described photoelectric detecting signal amplifier signal output terminal connection data capture card, described data collecting card output terminal connects PC data-interface.
2. transformer optical fiber grating temperature-measuring system according to claim 1, is characterized in that: described coupling mechanism is three-dB coupler.
3. transformer optical fiber grating temperature-measuring system according to claim 2, is characterized in that: arrange isolator between described wideband light source and coupling mechanism.
4. transformer optical fiber grating temperature-measuring system according to claim 3, is characterized in that: the model of described wideband light source is DL-BX-CS5169, and centre wavelength scope is 1530-1570nm; The model of described F-P wave filter is FFP-TF2, and wavelength band is 1260-1620nm, and the model of data collecting card is PCI-6133, and the model of light grating sensor is FBG-T-01, and operating wavelength range is 1510-1590nm.
CN201410826207.4A 2014-12-26 2014-12-26 Fiber bragg grating temperature measurement system of transformer CN104515622A (en)

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WO2004104536A1 (en) * 2003-05-23 2004-12-02 Sensor Highway Limited Distributed temperature sensing system with remote reference coil
RU2248540C1 (en) * 2003-05-29 2005-03-20 Яковлев Михаил Яковлевич Fiber-optic temperature and deformation pick-up
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
CN103364658A (en) * 2013-06-28 2013-10-23 国网电力科学研究院武汉南瑞有限责任公司 Method for predicting service life of transformer based on fiber grating temperature measurement system
CN104132751A (en) * 2014-07-15 2014-11-05 沈阳市宏远电磁线有限公司 Automatic early-warning grating transposition wire
CN204389060U (en) * 2014-12-26 2015-06-10 国家电网公司 Transformer optical fiber grating temperature-measuring system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104536A1 (en) * 2003-05-23 2004-12-02 Sensor Highway Limited Distributed temperature sensing system with remote reference coil
RU2248540C1 (en) * 2003-05-29 2005-03-20 Яковлев Михаил Яковлевич Fiber-optic temperature and deformation pick-up
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
CN103364658A (en) * 2013-06-28 2013-10-23 国网电力科学研究院武汉南瑞有限责任公司 Method for predicting service life of transformer based on fiber grating temperature measurement system
CN104132751A (en) * 2014-07-15 2014-11-05 沈阳市宏远电磁线有限公司 Automatic early-warning grating transposition wire
CN204389060U (en) * 2014-12-26 2015-06-10 国家电网公司 Transformer optical fiber grating temperature-measuring system

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