CN105973511A - Distributed optical fiber-based transformer winding stress monitoring system - Google Patents

Distributed optical fiber-based transformer winding stress monitoring system Download PDF

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Publication number
CN105973511A
CN105973511A CN201610274553.5A CN201610274553A CN105973511A CN 105973511 A CN105973511 A CN 105973511A CN 201610274553 A CN201610274553 A CN 201610274553A CN 105973511 A CN105973511 A CN 105973511A
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CN
China
Prior art keywords
stress
winding
optical fiber
fiber
monitoring
Prior art date
Application number
CN201610274553.5A
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Chinese (zh)
Inventor
马国明
吴震
李成榕
宋宏图
刘姝嫔
Original Assignee
华北电力大学
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Application filed by 华北电力大学 filed Critical 华北电力大学
Priority to CN201610274553.5A priority Critical patent/CN105973511A/en
Publication of CN105973511A publication Critical patent/CN105973511A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/24Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infra-red, visible light, ultra-violet
    • G01L1/242Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infra-red, visible light, ultra-violet the material being an optical fibre
    • G01L1/246Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infra-red, visible light, ultra-violet the material being an optical fibre using integrated gratings, e.g. Bragg gratings

Abstract

The invention belongs to the on-line monitoring system technical field and relates to a distributed optical fiber-based transformer winding stress monitoring system. The distributed optical fiber-based transformer winding stress monitoring system is characterized in that a plurality of fully-distributed optical fiber stress sensors (1) are pre-embedded in electromagnetic wires of a high-voltage winding (3); the fully-distributed optical fiber stress sensors (1) are connected together by an optical fiber (2) and are fixed through clamping devices (4); the optical fiber (2) is led out from the fully-distributed optical fiber stress sensors (1) and is connected with a high-speed demodulation system; the output end of the high-speed demodulation system is connected with a stress acquisition system; and therefore, real-time monitoring of the stress of the transformer winding can be realized. With the distributed optical fiber-based transformer winding stress monitoring system adopted, rapid detection and distributed measurement of the stress of the winding can be realized; stress conditions at different positions of the winding can be mastered accurately under the effect of an impact force; the defect of low resolution of an existing demodulation instrument can be eliminated; and fast distributed monitoring of the electromotive force of the winding can be realized.

Description

Transformer Winding stress monitoring system based on distribution type fiber-optic

Technical field

The invention belongs to on-line monitoring system technical field, especially relate to a kind of based on distribution type fiber-optic Transformer Winding stress monitoring system.

Background technology

Power transformer is the important component part in power system.Operating Transformer Winding can be at it Around set up axial and radial leakage magnetic flux, when being short-circuited fault or during by lightning current percussion, The big electric current flow through on winding will cause electromagnetic force suffered by winding to increase severely.Winding is hit after power effect, will Cause the situations, i.e. winding deformation such as change in size axial, radial, winding distortion, bulge.Winding deformation It is likely to result in insulation distance to change or insulating paper generation breakage, when running into lightning surge, transformation Device will puncture between generation turn-to-turn, cake, and sudden damage accident occurs.Therefore Transformer Winding stress is entered Row monitoring, has important effect to preventing Accident of Transformer.

The method that the axial and radial stress of studies in China Transformer Winding mainly uses Theoretical Calculation at present, but It is owing to the relevant parameters such as transformer device structure is complicated, electric current density calculate error, and winding is as elasticity Its leakage magnetic flux of system is coupled field under impact force action, the calculated results and actual winding stress situation Still there is bigger gap, it is impossible to the judgement for deformation of transformer winding provides support.Simultaneously because on winding Produce electrodynamic Intruding wave, short circuit current has the highest frequency, and existing (FBG) demodulator cannot be to signal It is demodulated, causes and analyze the difficulty that end cannot be Tong Bu with test side.

Summary of the invention

In order to solve the problems referred to above, the present invention proposes a kind of Transformer Winding based on distribution type fiber-optic should Power monitoring system, it is characterised in that described system includes several fully distributed fiber strain gauges 1 Being embedded in inside the electromagnetic wire of high pressure winding 3, each fully distributed fiber strain gauge 1 is connected by optical fiber 2 It is connected together, is fixed by clamping device 4, then optical fiber 2 is drawn out to fully distributed fiber stress sensing The outside of device 1 is connected with high-speed demodulating system, and high-speed demodulating system outfan is connected to stress acquisition system, Realize the real-time monitoring to Transformer Winding stress;A whole set of stress monitoring system is capable of winding stress Quickly detection and distributed measurement function, under the effect of impulsive force, accurately grasp winding diverse location Stress situation.

The working method of described high-speed demodulating system is that high pressure winding is hit after power effect, is embedded in high pressure Fully distributed fiber strain gauge within the electromagnetic wire of winding is stressed effect, high-speed demodulating system Using light intensity demodulation method, the broadband light that broadband ASE light source sends enters full distributed by light circulator The fiber grating FBG array of optical fiber stress sensor 1, wavelength-division multiplex based on FBG itself, work as FBG After being stressed impact, wavelength changes, and return signal enters WDM by light circulator WDM realizes the separation of different wave length optical signal so that the return signal of different FBG enters difference Photodetector, photodetector by measurement to light intensity signal be changed into reflection winding stress telecommunications High-speed data processing module and data disaply moudle is inputted after number passing sequentially through wave filter and amplifier, it is achieved Winding quick washing power is analyzed in real time and shown.

Described fully distributed fiber strain gauge 1 uses method for continuous measuring, in whole optical fiber 2 length Any point be all sensitive spot, whole optical fiber 2 is attached to inside the electromagnetic wire of high pressure winding 3, it is achieved Multimetering.

Described fiber grating FBG uses bonding partially method to be packaged, and during encapsulation, optical fiber grating FBG is not Paste List is in susceptor surface, and non-adhesive portion is unsettled, carries out embedding with epoxy resin, treats that resin solidifies After, total is integrally formed;The part pasted will be the most sensitive to temperature and stress, non-adhesive portion I.e. overhanging portion is the most temperature sensitive, solves the Temperature cross-over when to Transformer Winding stress monitoring quick Sense problem, overcomes and moves and cannot be distinguished by temperature and stress shadow only by measuring fiber bragg grating center wavelength The problem rung.

Beneficial effect

The present invention has full distributed measurement, can distinguish temperature and stress, the at a high speed online prison of solution mediation simultaneously The feature surveyed.Can be under Intruding wave, VFTO and short circuit current effect, Transformer Winding stress being carried out many Point monitoring, rests in the lower Transformer Winding stressing conditions of different transient state impact by high-speed demodulating system comprehensively.

Accompanying drawing explanation

Fig. 1 is Transformer Winding stress monitoring system schematic diagram based on distribution type fiber-optic.

Fig. 2 is winding stress monitoring high-speed demodulating system schematic diagram;

Fig. 3 is that fiber grating FBG uses bonding partially method schematic diagram;

Fig. 4 is that fiber grating FBG uses encapsulation schematic diagram based on bonding partially method;

Fig. 5 is that fiber-optic grating sensor embedded type encapsulates electromagnetic wire schematic diagram;

1-fully distributed fiber strain gauge;2-optical fiber;3-high pressure winding;4-clamping device.

Detailed description of the invention

Below with reference to the accompanying drawings and in conjunction with the embodiments, the present invention is described in detail.

Fig. 1 shows Transformer Winding stress monitoring system connection diagram based on distribution type fiber-optic.Optical fiber Use bonding partially mode to be packaged, fully distributed fiber strain gauge be embedded in winding magnetic wire, Optical fiber is drawn sensor external again be connected with the high-speed demodulating system of design, and by stress acquisition system Transformer Winding stress is monitored in real time.Winding is hit after power effect, is embedded in winding magnetic wire After internal fully distributed fiber strain gauge is stressed effect, utilize the ripple in high-speed demodulating system Divide multiplexing equipment that the optical signal of different sensors is separated, then optical signal modular converter and data process Module obtains the stress intensity of corresponding measuring point.Whole system be capable of the quickly detection to winding stress and Distributed measurement function, accurately grasps the stress situation of winding diverse location under the effect of impulsive force.

Fig. 2 shows winding stress monitoring high-speed demodulating system schematic diagram of the present invention.Due to winding Suffered electrodynamic action time is the shortest, and the light intensity demodulation method that therefore native system uses is light intensity demodulation. The broadband light that broadband ASE light source sends enters FBG array, wavelength-division multiplex based on FBG itself by bonder Property, utilize WDM (WDM) to realize the separation of different wave length optical signal so that different FBG pass Sensor return signal enters different optical signal modular converter.After FBG is stressed impact, wavelength becomes Changing, and then changed accordingly by the light intensity of matched fiber grating, measurement is arrived by optical signal modular converter Light intensity signal be changed into reflection winding stress the signal of telecommunication.Develop high-speed data processing module sum simultaneously According to display module, it is achieved winding quick washing power is analyzed in real time and shown.

Fig. 3 shows the bonding partially method of fiber grating, first grating two ends is applied certain pulling force, Make grid region elongated.Then, with binding agent, the grating of half is pasted onto on base, the center of two sections of gratings Wavelength difference 0.4nm.So, the grating of the section of stickup will not deform upon because of stress suffered by base, The most never paste section grating partially reflective return wavelength conversion only the most relevant with the change of ambient temperature. On the contrary, wavelength then counter stress and temperature sensitivity simultaneously that section optical grating reflection is returned are pasted.Thus can be by temperature Spend the impact on grating to separate, reach to measure the purpose of winding stress.

Fig. 4 shows the method for packing of fully distributed fiber strain gauge, and this encapsulation scheme is viscous based on part The half of naked grating is first pasted on base by patch method.Remainder epoxy resin carries out embedding, treats resin After solidification, total is integrally formed, and the strain gauge after all encapsulation is linked together by optical fiber.

Fig. 5 shows that fully distributed fiber strain gauge fiber-optic grating sensor embedded type encapsulates electromagnetic wire Schematic diagram, carries out fluting processing on winding magnetic wire, is embedded in by fully distributed fiber strain gauge In winding magnetic wire, after bag paper, it is applied to Transformer Winding.In order to meet measure dot number amount requirement, at height Pressure, introduces the many optical fiber with sensor respectively in middle pressure and low-voltage coil.Such sensor is installed Method potential-free span, meets opering characteristic of electric apparatus requirement.When running into stay, carry out after the same method Encapsulation.Finally lead to, outside transformator, be connected to high-speed demodulating system by optical fiber interface by sensor And acquisition system, winding stress data is monitored and analyzed.

Claims (4)

1. Transformer Winding stress monitoring system based on distribution type fiber-optic, it is characterised in that described system Including the electromagnetic wire that several fully distributed fiber strain gauges (1) are embedded in high pressure winding (3) Inside, each fully distributed fiber strain gauge (1) is linked together by optical fiber (2), by clamping Device (4) is fixed, then optical fiber (2) is drawn out to the outside of fully distributed fiber strain gauge (1) Being connected with high-speed demodulating system, high-speed demodulating system outfan is connected to stress acquisition system, it is achieved to change The real-time monitoring of depressor winding stress;A whole set of stress monitoring system is capable of the quick inspection to winding stress Survey and distributed measurement function, under the effect of impulsive force, accurately grasp the stress situation of winding diverse location.
Transformer Winding stress monitoring system based on distribution type fiber-optic the most according to claim 1, It is characterized in that, the working method of described high-speed demodulating system is that high pressure winding is hit after power effect, in advance It is embedded in the fully distributed fiber strain gauge within the electromagnetic wire of high pressure winding and is stressed effect, at a high speed Demodulating system uses light intensity demodulation method, and the broadband light that broadband ASE light source sends is entered by light circulator The fiber grating FBG array of fully distributed fiber strain gauge (1), wavelength-division based on FBG itself is multiple By property, after FBG is stressed impact, wavelength changes, and return signal is entered by light circulator WDM WDM realizes the separation of different wave length optical signal so that returning of different FBG Write in reply and number enter a different photodetector, photodetector by measurement to light intensity signal be changed into reflection The signal of telecommunication of winding stress inputs high-speed data processing module and data after passing sequentially through wave filter and amplifier Display module, it is achieved winding quick washing power is analyzed in real time and shown.
Transformer Winding stress monitoring system based on distribution type fiber-optic the most according to claim 1, It is characterized in that, described fully distributed fiber strain gauge (1) uses method for continuous measuring, whole light Any point in fine (2) length is all sensitive spot, and whole optical fiber (2) is attached to high pressure winding (3) Electromagnetic wire inside, it is achieved multimetering.
Transformer Winding stress monitoring system based on distribution type fiber-optic the most according to claim 1, It is characterized in that, described fiber grating FBG uses bonding partially method to be packaged, fiber grating during encapsulation FBG is not all of being pasted onto susceptor surface, and non-adhesive portion is unsettled, carries out embedding with epoxy resin, waits to set After fat solidification, total is integrally formed;The part pasted will be the most sensitive to temperature and stress, not glue Patch part i.e. overhanging portion is the most temperature sensitive, solves the temperature when to Transformer Winding stress monitoring Cross sensitivity problem, overcome only by measure fiber bragg grating center wavelength move cannot be distinguished by temperature with The problem of stress influence.
CN201610274553.5A 2016-04-28 2016-04-28 Distributed optical fiber-based transformer winding stress monitoring system CN105973511A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106052911A (en) * 2016-06-14 2016-10-26 东莞市联洲知识产权运营管理有限公司 Transformer winding stress monitoring device and monitoring method thereof
CN106646097A (en) * 2016-11-28 2017-05-10 华北电力大学 Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors
CN106768559A (en) * 2017-01-17 2017-05-31 华北电力大学(保定) A kind of dynamic force analysis method of Transformer Winding under short trouble

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CN2569119Y (en) * 2002-09-18 2003-08-27 新疆特变电工股份有限公司 On-line monitor for hot-spot temp of transformer winding
CN101158592A (en) * 2007-10-15 2008-04-09 北京航空航天大学 Optical fiber distributed temperature and stress sensing device
CN101283242A (en) * 2005-10-07 2008-10-08 住友电气工业株式会社 Temperature measurement device and temperature measurement method
CN101545817A (en) * 2009-04-30 2009-09-30 山东省科学院激光研究所 Fiber grating osmotic pressure sensor with low measuring range
CN101949745A (en) * 2010-09-08 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Monitoring system of internal temperature and stress of power transformer winding and monitoring method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002093120A1 (en) * 2001-05-11 2002-11-21 European Organization For Nuclear Research A cryogenic optical fibre temperature sensor
CN2569119Y (en) * 2002-09-18 2003-08-27 新疆特变电工股份有限公司 On-line monitor for hot-spot temp of transformer winding
CN101283242A (en) * 2005-10-07 2008-10-08 住友电气工业株式会社 Temperature measurement device and temperature measurement method
CN101158592A (en) * 2007-10-15 2008-04-09 北京航空航天大学 Optical fiber distributed temperature and stress sensing device
CN101545817A (en) * 2009-04-30 2009-09-30 山东省科学院激光研究所 Fiber grating osmotic pressure sensor with low measuring range
CN101949745A (en) * 2010-09-08 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Monitoring system of internal temperature and stress of power transformer winding and monitoring method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106052911A (en) * 2016-06-14 2016-10-26 东莞市联洲知识产权运营管理有限公司 Transformer winding stress monitoring device and monitoring method thereof
CN106646097A (en) * 2016-11-28 2017-05-10 华北电力大学 Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors
CN106646097B (en) * 2016-11-28 2019-07-02 华北电力大学 Using the deformation of transformer winding on-line monitoring system of fiber Bragg grating strain sensor
CN106768559A (en) * 2017-01-17 2017-05-31 华北电力大学(保定) A kind of dynamic force analysis method of Transformer Winding under short trouble
CN106768559B (en) * 2017-01-17 2019-08-20 华北电力大学(保定) A kind of dynamic force analysis method of transformer winding under short trouble

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Application publication date: 20160928