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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China
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stress
optical fiber
winding
distributed
high
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CN201610274553.5A
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Chinese (zh)
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马国明
吴震
李成榕
宋宏图
刘姝嫔
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华北电力大学
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Priority to CN201610274553.5A priority Critical patent/CN105973511A/en
Publication of CN105973511A publication Critical patent/CN105973511A/en

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    • 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

基于分布式光纤的变压器绕组应力监测系统 Stress monitoring system based on transformer windings distributed optical fiber

技术领域 FIELD

[0001]本发明属于在线监测系统技术领域,尤其是涉及一种基于分布式光纤的变压器绕组应力监测系统。 [0001] The present invention belongs to the technical field online monitoring system, in particular to a transformer windings stress monitoring optical fiber-based distributed system.

背景技术 Background technique

[0002]电力变压器是电力系统中的重要组成部分。 [0002] Power transformer is an important part of the power system. 运行中的变压器绕组会在其周围建立轴向和辐向漏磁通,当发生短路故障或者受到雷电流冲击作用时,绕组上流过的大电流将导致绕组所受电磁力剧增。 Transformer windings running creates axial and radial leakage flux at the periphery thereof, when a short circuit fault or action by the impact of lightning current, a large current flows through the winding will result in an electromagnetic force suffered windings surge. 绕组受冲击力作用后,将造成轴向、辐向尺寸变化、绕组扭曲、鼓包等情况,即绕组变形。 Winding by the impact force, will result in axial, radial to the case where the size change, the winding twisted, like bulge, i.e. winding deformation. 绕组变形可能造成绝缘距离发生改变或绝缘纸发生破损,当遇到雷电过电压时,变压器将发生匝间、饼间击穿,发生突发性损坏事故。 Winding deformation may result from altered or insulating paper insulating breakage, when faced with lightning overvoltage, the transformer will occur between the turns, the breakdown between cake, sudden accident damage. 因此对变压器绕组应力进行监测,对防止变压器事故发生有着重要的作用。 Therefore, the stress on the transformer winding to monitor, prevent accidents transformer plays an important role.

[0003]目前国内研究变压器绕组轴向和辐向应力主要采用理论计算的方法,但是由于变压器结构复杂,电流密度等相关参数计算误差,以及绕组作为弹性系统其漏磁通在冲击力作用下是耦合场,理论计算结果与实际绕组应力情况仍有较大差距,无法为变压器绕组变形的判断提供支撑。 [0003] At present, research and axial stress winding main transformer spoke theoretical calculation method, but due to the complex structure of the transformer, the current density related parameter calculation error, as well as winding an elastic system which is under the magnetic flux leakage impact force coupling field, theoretical calculations and actual stress situation is still far winding, can not provide support for the determination of the transformer winding deformation. 同时由于在绕组上产生电动力的侵入波、短路电流具有很高的频率,现有的解调仪无法对信号进行解调,造成分析端无法与检测端同步的困难。 At the same time due to the generation of electric power in the winding invasion wave, having a high frequency of short-circuit current, conventional demodulator demodulates the signal can not cause difficulties with the assay of the terminal can not synchronize the detection side.

发明内容 SUMMARY

[0004]为了解决上述问题,本发明提出了一种基于分布式光纤的变压器绕组应力监测系统,其特征在于,所述系统包括将若干个全分布式光纤应力传感器I预埋在高压绕组3的电磁线内部,各全分布式光纤应力传感器I由光纤2连接在一起,通过夹紧装置4固定,再将光纤2引出到全分布式光纤应力传感器I的外部与高速解调系统相连,高速解调系统输出端连接到应力采集系统,实现对变压器绕组应力的实时监测;整套应力监测系统能够实现对绕组应力的快速检测和分布式测量功能,在冲击力的作用下准确掌握绕组不同位置的应力情况。 [0004] In order to solve the above problems, the present invention proposes a transformer winding stress monitoring system based on distributed optical fiber, characterized in that said system comprises a plurality of fully distributed fiber optic sensor I embedded in the stress voltage winding 3 internal wire, each fully distributed fiber stress sensor I connected by optical fibers 2 together, fixing by clamping means 4, and then the optical fiber 2 drawn to fiber fully distributed external stress sensor I connected with the high-speed demodulation system, high-speed solution tone output is connected to the system acquisition system stress, the stress time monitoring transformer winding; complete stress monitoring system enables rapid detection and stress measurement functions distributed winding stresses, under the effect of an impact force to accurately grasp the positions of the different windings Happening.

[0005]所述高速解调系统的工作方式为高压绕组受冲击力作用后,预埋在高压绕组的电磁线内部的全分布式光纤应力传感器受到应力作用,高速解调系统采用光强解调方法,宽带ASE光源发出的宽带光通过光循环器进入全分布式光纤应力传感器I的光纤光栅FBG阵列,基于FBG本身的波分复用性,当FBG受到应力影响后,波长发生变化,返回信号通过光循环器进入波分复用设备WDM实现不同波长光信号的分离,使得不同的FBG传感器的返回信号进入不同的光电探测器,光电探测器将测量到的光强信号转变为反映绕组应力的电信号依次通过滤波器和放大器后输入高速数据处理模块和数据显示模块,实现对绕组快速冲击力进行实时分析和显示。 [0005] The mode of operation for high-speed demodulation system receiving the high voltage winding after the impact force, embedded inside the high voltage winding of the magnet wire fully distributed under stress fiber stress sensor, using high-speed demodulation system demodulates intensity the method of broadband, the broadband ASE light from the source into the optical fiber grating FBG fully distributed fiber stress sensor array through the optical circulator I, wavelength division multiplexing of the FBG itself when subjected to stress of the FBG, the wavelength changes, the return signal by entering a wavelength division multiplexed optical circulator separation apparatus WDM optical signals of different wavelengths, such that different FBG sensor return signal into a different photodetector, the photodetector will measure the reflected light intensity signal into the winding stress sequentially displayed by the electrical signal filter module and the amplifier input data and high-speed data processing module, an impact force to achieve rapid winding real-time analysis and display.

[0006] 所述全分布式光纤应力传感器I采用连续测量方法,整个光纤2长度上的任一点都是敏感点,将整根光纤2贴附在高压绕组3的电磁线内部,实现多点测量。 [0006] The sensor I fully distributed continuous fiber stress measuring method, any length of the entire optical fiber 2 on the points that are sensitive points, the entire fiber 2 is attached inside the high-voltage winding 3 of the magnet wire, multi-point measurement .

[0007]所述光纤光栅FBG采用部分粘贴法进行封装,封装时光纤光栅FBG不是全部粘贴在底座表面,未粘贴部分悬空,用环氧树脂进行灌封,待树脂固化后,整个结构构成一体;粘贴的部分将对温度和应力同时敏感,未粘贴部分即悬空部分只对温度敏感,解决了在对变压器绕组应力监测时的温度交叉敏感问题,克服了仅仅通过测量光纤光栅中心波长移动无法区分温度与应力影响的问题。 [0007] The fiber Bragg grating FBG encapsulation method using the paste portion, when the FBG FBG not all the surface of the base paste, suspended part is not attached, potting with an epoxy resin, until the resin is cured, the entire structure formed integrally; while the temperature and stress sensitive portion will paste, i.e. is not attached overhang portion sensitive only to temperature, to solve the problem of temperature sensitive stress when winding transformer monitoring cross overcome only by measuring the center wavelength shift fiber grating temperature indistinguishable problems affecting the stress.

[0008] 有益效果 [0008] beneficial effects

[0009]本发明具有全分布式测量、能同时区分温度和应力、高速解调和在线监测的特点。 [0009] The present invention has fully distributed measurement, simultaneously distinguish the temperature and stress, and the demodulation characteristics of the high-speed line monitoring. 能够对侵入波、VFTO和短路电流作用下对变压器绕组应力进行多点监测,通过高速解调系统全面掌握在不同暂态冲击下变压器绕组受力情况。 Able to invade the waves, and short circuit current action VFTO in multi-point monitoring of the transformer winding stress, high-speed demodulation system in complete control of the transformer winding force under the different transient shock.

附图说明 BRIEF DESCRIPTION

[0010]图1为基于分布式光纤的变压器绕组应力监测系统示意图。 [0010] FIG. 1 is a schematic of the transformer windings stress monitoring system based on distributed fiber.

[0011 ]图2为绕组应力监测高速解调系统原理图; [0011] FIG. 2 is a high-speed stress monitoring winding demodulation system diagram;

[0012]图3为光纤光栅FBG采用部分粘贴方法示意图; [0012] FIG. 3 is a schematic view of an optical fiber grating FBG part attaching method employed;

[0013]图4为光纤光栅FBG采用基于部分粘贴法的封装示意图; [0013] FIG. 4 is a schematic view of the package using the fiber Bragg grating FBG portion based paste method;

[0014]图5为光纤光栅传感器埋入式封装电磁线示意图; [0014] FIG. 5 is a FBG sensor EMBEDDED schematic Wire;

[0015] 1-全分布式光纤应力传感器;2-光纤;3-高压绕组;4-夹紧装置。 [0015] 1- fully distributed fiber stress sensor; 2- optical fiber; 3- voltage winding; 4- clamping means.

具体实施方式 Detailed ways

[0016]下面将参考附图并结合实施例,来详细说明本发明。 [0016] below with reference to accompanying drawings and embodiments, the present invention will be described in detail.

[0017]图1示出了基于分布式光纤的变压器绕组应力监测系统连接示意图。 [0017] FIG. 1 shows a schematic diagram of the transformer windings is connected Stress Monitoring System Based on Distributed Optical Fiber. 光纤采用部分粘贴方式进行封装,将全分布式光纤应力传感器预埋在绕组电磁线,再将光纤引出传感器外部与设计的高速解调系统相连,并通过应力采集系统对变压器绕组应力进行实时监测。 Mode optical fiber using adhesive encapsulated partially, the fully distributed optical fiber sensor embedded in the winding magnet wire stress, and then the fiber pigtails external sensor connected to the system design of high-speed demodulation, and real-time monitoring of the winding of the transformer stress the stress collection system. 绕组受冲击力作用后,预埋在绕组电磁线内部的全分布式光纤应力传感器受到应力作用后,利用高速解调系统中的波分复用设备对不同传感器的光信号进行分离,再光信号转换模块和数据处理模块获取相应测点的应力强度。 After winding by the impact force, the magnet wire embedded in the inner winding fully distributed under stress fiber stress sensor, a high-speed demodulation system of wavelength division multiplexed optical signals of different sensor devices were separated, and then the optical signal conversion module and a data processing module acquires the corresponding stress intensity measurement point. 整套系统能够实现对绕组应力的快速检测和分布式测量功能,在冲击力的作用下准确掌握绕组不同位置的应力情况。 The entire system enables rapid detection and measurement functions of the distributed winding stress, stress accurately grasp the positions where different windings by the action of an impact force.

[0018]图2示出了本发明所采用的绕组应力监测高速解调系统原理图。 [0018] FIG. 2 shows a high-speed stress monitoring the winding diagram demodulation system used in the present invention. 由于绕组所受电动力的作用时间很短,因此本系统采用的光强解调方法为光强解调。 Electric power suffered since the winding action for a short time, the light intensity of the system demodulation method used in a light intensity demodulator. 宽带ASE光源发出的宽带光通过耦合器进入FBG阵列,基于FBG本身的波分复用性,利用波分复用设备(WDM)实现不同波长光信号的分离,使得不同FBG传感器返回信号进入不同光信号转换模块。 Broadband broadband ASE light enters the light emitted by the array of FBG coupler, wavelength division multiplexing of the FBG itself, using a wavelength division multiplexing device (WDM) to achieve separation of different wavelengths of light signals, such that different FBG sensors into a different optical return signal signal conversion module. 当FBG受到应力影响后,波长发生变化,进而通过匹配光纤光栅的光强相应发生变化,光信号转换模块将测量到的光强信号转变为反映绕组应力的电信号。 When the FBG is subjected to stress impact, the wavelength changes, and thus vary the light intensity by matching the corresponding fiber grating, an optical signal conversion module converts the measured light intensity signal into an electrical signal reflecting the winding stress. 同时研制高速数据处理模块和数据显示模块,实现对绕组快速冲击力进行实时分析和显示。 At the same time the development of high-speed data processing module and data display module, for fast winding impact real-time analysis and display.

[0019]图3示出了光纤光栅的部分粘贴方法,首先对光栅两端施加一定的拉力,使栅区变长。 [0019] FIG. 3 illustrates a method of joining an optical fiber grating portion, first apply a certain tension to both ends of the grating, the gate region becomes long. 然后,用粘合剂将一半的光栅粘贴在底座上,两段光栅的中心波长相差0.4nm。 Then, half of the grating with an adhesive attached to the base, two grating center wavelength phase difference 0.4nm. 这样,未粘贴段的光栅将不会因为底座所受应力而发生形变,因此从未粘贴段光栅部分反射回来的波长变换只与周围环境温度的变化有关。 Thus, the grating period is not attached because the stress of the base will not be deformed, thus never paste grating portion reflected wavelength conversion sections only related to changes in ambient temperature. 相反,粘贴段光栅反射回来的波长则对应力和温度同时敏感。 In contrast, paste reflected wavelength sections of the grating are simultaneously sensitive to stress and temperature. 由此可以将温度对光栅的影响分离出来,达到测量绕组应力的目的。 Thereby separating out the effect of temperature on the grating, the purpose of measuring winding stress.

[0020]图4示出了全分布式光纤应力传感器的封装方法,该封装方案基于部分粘贴法先将裸光栅的一半粘贴于底座。 [0020] FIG. 4 shows a fully distributed optical fiber stress sensor packaging method, based on a half portion of the first paste method nude packaging solution grating is attached to the base. 其余部分用环氧树脂进行灌封,待树脂固化后,整个结构构成一体,所有封装后的应力传感器由光纤连接在一起。 Remaining part with epoxy potting, until the resin is cured, the entire structure formed integrally, after all the stress sensor package connected by an optical fiber.

[0021 ]图5示出了全分布式光纤应力传感器光纤光栅传感器埋入式封装电磁线示意图,在绕组电磁线上进行开槽加工,将全分布式光纤应力传感器预埋在绕组电磁线中,包纸后应用于变压器绕组。 [0021] FIG. 5 shows a fully distributed optical fiber Bragg grating sensors embedded stress sensor package Wire schematic, grooving machining the winding wire, the fully distributed optical fiber sensor embedded in the stress in the magnet wire windings, after the wrapper is applied to the transformer windings. 为了满足测量点数量要求,在高压,中压和低压线圈中分别引入多根带有传感器的光纤。 In order to meet the requirements of the number of measurement points, in the high pressure, intermediate pressure and low pressure are introduced into the coil with a plurality of optical fiber sensors. 这样的传感器安装方法无电势跨度,满足了电器特性要求。 Such a method of mounting the sensor potential-span meet the electrical property requirements. 遇到撑条时,按照同样的方法进行封装。 Encountered stay, encapsulated in the same manner. 最后将传感器通过光纤接口引出至变压器外部,连接至高速解调系统和采集系统,对绕组应力数据进行监测和分析。 Finally, the sensor through the optical fiber drawn out to the outside of the transformer interface connected to a high-speed demodulation system and collection system, winding stress data monitoring and analysis.

Claims (4)

1.基于分布式光纤的变压器绕组应力监测系统,其特征在于,所述系统包括将若干个全分布式光纤应力传感器(I)预埋在高压绕组(3)的电磁线内部,各全分布式光纤应力传感器(I)由光纤(2)连接在一起,通过夹紧装置(4)固定,再将光纤(2)引出到全分布式光纤应力传感器(I)的外部与高速解调系统相连,高速解调系统输出端连接到应力采集系统,实现对变压器绕组应力的实时监测;整套应力监测系统能够实现对绕组应力的快速检测和分布式测量功能,在冲击力的作用下准确掌握绕组不同位置的应力情况。 1. transformer winding stress monitoring system based on distributed optical fiber, characterized in that the system comprises a plurality of fully distributed fiber stress sensor (I) embedded within the magnet wire high-voltage winding (3), each fully distributed optical stress sensor (I) is connected by an optical fiber (2) together, (4) is fixed by clamping means, and then the optical fiber (2) lead to a fully distributed fiber stress sensor (I) is connected to the external high-speed demodulation system, High-speed demodulation system output connected to the acquisition system stress, the stress time monitoring transformer winding; complete stress monitoring system can quickly detect and distributed winding stress measurements, accurate knowledge of different winding position under the force of the impact the stress of the situation.
2.根据权利要求1所述的基于分布式光纤的变压器绕组应力监测系统,其特征在于,所述高速解调系统的工作方式为高压绕组受冲击力作用后,预埋在高压绕组的电磁线内部的全分布式光纤应力传感器受到应力作用,高速解调系统采用光强解调方法,宽带ASE光源发出的宽带光通过光循环器进入全分布式光纤应力传感器(I)的光纤光栅FBG阵列,基于FBG本身的波分复用性,当FBG受到应力影响后,波长发生变化,返回信号通过光循环器进入波分复用设备WDM实现不同波长光信号的分离,使得不同的FBG传感器的返回信号进入不同的光电探测器,光电探测器将测量到的光强信号转变为反映绕组应力的电信号依次通过滤波器和放大器后输入高速数据处理模块和数据显示模块,实现对绕组快速冲击力进行实时分析和显示。 2. The transformer winding stress monitoring system based on distributed optical fiber, characterized in that said claim 1, the high-speed mode of operation of the high voltage winding demodulation system by the impact force, the magnet wires embedded in the high voltage winding fully distributed inside the fiber stress sensor under stress, high-speed demodulation system demodulation method uses intensity, broadband ASE light emitted from the broadband light entering the fully distributed fiber stress sensor (I) by a fiber grating FBG array optical circulator, wavelength division multiplexing of FBG itself when subjected to stress of the FBG, the wavelength changes, the device returns the signal into a wavelength division multiplexed WDM optical signals to achieve separation of different wavelengths through an optical circulator, such that different FBG sensor return signal into a different photodetector, the photodetector will measure the light intensity signal into an electrical signal to reflect the stress of the winding are sequentially displayed after the filter module and the amplifier input data and high-speed data processing module, to achieve rapid winding of the impact force in real time analysis and display.
3.根据权利要求1所述的基于分布式光纤的变压器绕组应力监测系统,其特征在于,所述全分布式光纤应力传感器(I)采用连续测量方法,整个光纤(2)长度上的任一点都是敏感点,将整根光纤(2)贴附在高压绕组(3)的电磁线内部,实现多点测量。 3. The transformer windings stress monitoring system based on distributed optical fiber, wherein according to claim 1, the fully distributed fiber stress sensor (I) using continuous measurement methods, (2) any point on the length of the entire fiber all sensitive points, the entire fiber (2) is attached inside the high-voltage winding magnet wires (3), the multi-point measurement.
4.根据权利要求1所述的基于分布式光纤的变压器绕组应力监测系统,其特征在于,所述光纤光栅FBG采用部分粘贴法进行封装,封装时光纤光栅FBG不是全部粘贴在底座表面,未粘贴部分悬空,用环氧树脂进行灌封,待树脂固化后,整个结构构成一体;粘贴的部分将对温度和应力同时敏感,未粘贴部分即悬空部分只对温度敏感,解决了在对变压器绕组应力监测时的温度交叉敏感问题,克服了仅仅通过测量光纤光栅中心波长移动无法区分温度与应力影响的问题。 4. The transformer winding stress monitoring system based on distributed optical fiber, wherein according to claim 1, the optical fiber grating FBG packaging method using the paste portion, when not all FBG FBG attached to the base surface, is not attached suspended part, carried out with epoxy potting, until the resin is cured, the entire structure formed integrally; the same temperature and stress sensitive portion will paste, i.e. is not attached overhang portion sensitive only to temperature, the stress solves the transformer winding temperature cross-sensitivity problem of monitoring, overcomes the problem only by moving the optical fiber grating center wavelength measurement can not distinguish between temperature and stress effects.
CN201610274553.5A 2016-04-28 2016-04-28 Distributed optical fiber-based transformer winding stress monitoring system CN105973511A (en)

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