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WO2018072698A1 - 用于复合绝缘子老化程度检测的核磁共振测量系统 - Google Patents

用于复合绝缘子老化程度检测的核磁共振测量系统 Download PDF

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Publication number
WO2018072698A1
WO2018072698A1 PCT/CN2017/106597 CN2017106597W WO2018072698A1 WO 2018072698 A1 WO2018072698 A1 WO 2018072698A1 CN 2017106597 W CN2017106597 W CN 2017106597W WO 2018072698 A1 WO2018072698 A1 WO 2018072698A1
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Prior art keywords
magnetic resonance
nuclear magnetic
nmr
nmr spectrometer
composite insulator
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French (fr)
Inventor
籍勇亮
王谦
侯兴哲
吴高林
徐征
宫林
胡晓锐
彭华东
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Chongqing University
Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
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Chongqing University
Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
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Priority to JP2017564660A priority Critical patent/JP2018538510A/ja
Publication of WO2018072698A1 publication Critical patent/WO2018072698A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance

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  • the present disclosure relates to the field of composite insulator aging detection technology, for example, to a nuclear magnetic resonance measurement system for composite insulator aging detection.
  • Composite insulators should be widely installed in high-voltage transmission lines due to their light weight, high mechanical strength, non-breakability and good stain resistance.
  • the composite insulator shed is the outer insulation of the composite insulator to protect the mandrel from atmospheric attack, provide the necessary creepage distance, and improve stain resistance.
  • the composite insulator shed may age or be broken under the erosion of the grid overvoltage and the natural environment. The aging or broken composite insulator shed reduces the safety of the power supply, so the composite insulator umbrella The detection of the degree of aging of the skirt is of great significance.
  • the method for detecting the aging of the composite insulator umbrella skirt includes an observation method, a water spray classification method, a leakage current method, a contact angle method, and a thermal stimulation current method.
  • the observation method and the HC water jet classification method are susceptible to the subjective judgment of the maintenance personnel, and the reliability is poor.
  • the factors affecting the current magnitude in the leakage current method are complex, random, and the detection results are not reliable.
  • the contact angle method and the thermal stimulation current method have high requirements for the test environment, and can be set to off-line measurement under laboratory conditions, and the operation is complicated.
  • the present disclosure proposes a nuclear magnetic resonance measurement system configured to detect the degree of aging of a composite insulator, which can accurately detect the aging degree of the composite insulator shed.
  • a nuclear magnetic resonance detection system includes: a nuclear magnetic resonance NMR sensor, a duplexer, an NMR spectrometer, a controller, an input device, an output device, and a power source, wherein
  • the input device is configured to receive a control command input by a user and send the control command to The controller;
  • the controller is configured to control the NMR spectrometer to generate a radio frequency excitation signal when the received control command is a start command, and send the radio frequency excitation signal to the NMR sensor through the duplexer, and The nuclear magnetic resonance echo signal detected by the NMR sensor is sent to the NMR spectrometer through the duplexer;
  • the NMR sensor is configured to establish a static magnetic field and a radio frequency excitation magnetic field in the measured area after receiving the radio frequency excitation signal, and detect the nuclear magnetic resonance echo signal;
  • the duplexer is configured to perform switching between RF excitation signal transmission and nuclear magnetic resonance echo signal transmission;
  • the NMR spectrometer is configured to perform an exponential inversion process on the nuclear magnetic resonance echo signal to obtain a transverse relaxation time, and obtain an aging degree of the composite insulator shed according to the transverse relaxation time;
  • the output device is configured to output aging degree data of the composite insulator shed
  • the power source is configured to power the controller and the NMR spectrometer.
  • the system further includes: a power amplifier connected between the NMR spectrometer and the duplexer, wherein the power amplifier performs power amplification on the RF excitation signal sent by the NMR spectrometer And transmitting, by the duplexer, a power amplified RF excitation signal to the NMR sensor.
  • a power amplifier connected between the NMR spectrometer and the duplexer, wherein the power amplifier performs power amplification on the RF excitation signal sent by the NMR spectrometer And transmitting, by the duplexer, a power amplified RF excitation signal to the NMR sensor.
  • the system further includes: a preamplifier connected between the NMR spectrometer and the duplexer, wherein the preamplifier amplifies the nuclear magnetic resonance echo signal, and then sends the amplified nuclear magnetic field The resonant echo signal is sent to the NMR spectrometer.
  • a preamplifier connected between the NMR spectrometer and the duplexer, wherein the preamplifier amplifies the nuclear magnetic resonance echo signal, and then sends the amplified nuclear magnetic field The resonant echo signal is sent to the NMR spectrometer.
  • the system further includes: a universal serial bus USB data transmission device connected to the controller, wherein the USB data transmission device is configured to connect to the mobile storage device.
  • a universal serial bus USB data transmission device connected to the controller, wherein the USB data transmission device is configured to connect to the mobile storage device.
  • the controller is a 32-bit microcontroller based on the ARM core of the advanced reduced instruction set computer processor.
  • the input device and the output device are respectively touch screens.
  • the NMR spectrometer comprises: a lock-in amplifier, and the lock-in amplifier uses a phase sensitive detection method to detect a nuclear magnetic resonance echo signal.
  • the power source is a lithium battery.
  • FIG. 1 is a schematic structural view of a first nuclear magnetic resonance detecting system provided for detecting the aging degree of a composite insulator umbrella skirt according to the first embodiment
  • FIG. 2 is a schematic structural view of a nuclear magnetic resonance detecting system for detecting the aging degree of a composite insulator umbrella skirt according to an embodiment
  • FIG. 3 is a schematic structural diagram of a third nuclear magnetic resonance detecting system configured to detect the age of a composite insulator umbrella skirt according to an embodiment
  • FIG. 4 is a schematic structural diagram of a fourth nuclear magnetic resonance detection system configured to detect the age of a composite insulator umbrella skirt according to an embodiment.
  • nuclear magnetic resonance technology is used to realize the aging degree detection of the composite insulator umbrella skirt.
  • nuclear magnetic resonance technology is widely used in life medical, food analysis, quality control, materials science and geophysics.
  • the NMR technique utilizes the magnetic resonance properties of the H nucleus to obtain the Magnetic Resonance Spectroscopy (MRS) of the H nucleus, and to understand the nature and location of the nucleus according to the characteristics of the MRS, such as the width, shape and area of the line.
  • MRS Magnetic Resonance Spectroscopy
  • FIG. 1 is a schematic structural view of the system, the device comprising: a nuclear magnetic resonance (NMR) sensor 11 and a double The workpiece 12, the NMR spectrometer 13, the controller 14, an input device (also referred to as an input device) 15, an output device (also referred to as an output device) 16, and a power source 17.
  • NMR nuclear magnetic resonance
  • the input device 15 is arranged to receive a control command input by the user and to transmit the control command to the controller 14.
  • the controller 14 is configured to control the NMR spectrometer 13 to generate a radio frequency excitation signal when the received control command is a start command, and send the radio frequency excitation signal to the NMR sensor 11 through the duplexer 12, and detect the NMR sensor 11 The resulting nuclear magnetic resonance echo signal is sent to the NMR spectrometer 13 through the duplexer 12.
  • the NMR sensor 11 is arranged to establish a static magnetic field and a radio frequency excitation magnetic field in the measured region after receiving the radio frequency excitation signal, and detect the nuclear magnetic resonance echo signal.
  • the duplexer 12 is arranged to switch between RF excitation signal transmission and nuclear magnetic resonance echo signal transmission.
  • the NMR spectrometer 13 is arranged to perform an exponential inversion process on the nuclear magnetic resonance echo signal to obtain a transverse relaxation time, and the degree of aging of the composite insulator shed is obtained according to the transverse relaxation time.
  • the output device 16 is arranged to output the degree of aging of the composite insulator shed.
  • a power source 17 is provided to power the controller 14 and the NMR spectrometer 13.
  • the state of the hydrogen nucleus in the numerator of the composite insulator is fixed, and the transverse relaxation time T2 is fixed.
  • the composite insulator umbrella skirt is aged, the molecular chain of the composite insulator umbrella skirt undergoes chemical changes such as breakage and recombination, and the state of the hydrogen atomic nucleus changes.
  • the measured transverse relaxation time T2 may also change.
  • the aging degree of the composite insulator shed is obtained by measuring the transverse relaxation time T2.
  • the nuclear magnetic resonance detection system for detecting the aging degree of the composite insulator umbrella skirt uses the nuclear magnetic resonance technology to quantitatively analyze the aging degree of the composite insulator shed and improve the accuracy of the detection result.
  • the NMR sensor detects the running composite insulator shed, which enables on-line inspection (engineering on-site inspection), improves the efficiency of the aging inspection of composite insulator sheds, and improves the reliability of power supply.
  • FIG. 2 shows a schematic structural view of the system.
  • the system further includes a connection to the NMR spectrometer 13 And a power amplifier 18 between the duplexer 12.
  • the power amplifier 18 power-amplifies the RF excitation signal sent by the NMR spectrometer 13 and then transmits the power-amplified RF excitation signal to the NMR sensor 11 through the duplexer 12, so that the RF energy can excite the sample to generate a nuclear magnetic resonance echo signal.
  • FIG. 3 shows a schematic structural view of the system.
  • the system further includes a connection to the NMR spectrometer 13 and A preamplifier 19 between the duplexers 12. After the preamplifier 19 amplifies the nuclear magnetic resonance echo signal, the amplified nuclear magnetic resonance echo signal is sent to the NMR spectrometer 13 to facilitate the NMR spectrometer. 13 Detecting nuclear magnetic resonance echo signals.
  • FIG. 4 is a schematic structural view of the system.
  • the system further includes a universal string connected to the controller 14.
  • a Universal Serial Bus (USB) data transmission module (also referred to as a USB data transmission device) 20.
  • the USB) data transfer module 20 is arranged to connect to a mobile storage device. The detection result can be copied to the mobile storage device through the USB data transmission module 20.
  • USB Universal Serial Bus
  • the controller 14 is a 32-bit microcontroller based on a Advanced Reduced Instruction Set Computer (RISC) processor (ARM) core. Due to the high integration of the 32-bit single-chip based on the ARM core, the signal processing speed is fast, and many peripheral circuits are integrated, which reduces the volume of the above system and makes the system easy to carry.
  • RISC Reduced Instruction Set Computer
  • the input device 15 and the output device 16 are touch screens. Use the touch screen to provide human interaction. A series of operations can be performed by clicking on the touch screen, and the processed data and graphics are displayed on the display screen, which is easy to understand.
  • the NMR spectrometer 13 includes a lock-in amplifier, and the lock-in amplifier uses a phase sensitive detection method to detect the nuclear magnetic resonance echo signal.
  • the lock-in amplifier uses the phase sensitive detection method to detect the nuclear magnetic resonance echo signal, which improves the performance of the above system to suppress noise suppression.
  • the lock-in amplifier adopts the principle of synchronous coherent detection, that is, the reference signal having the same frequency and phase relationship with the measured signal is used as a comparison reference, and only the measured signal itself and the same frequency (or frequency doubling) and in-phase noise component as the reference signal are used. There is a response. Therefore, the lock-in amplifier can suppress unwanted noise and improve the detection signal-to-noise ratio.
  • the power source 17 is a lithium battery.
  • the lithium battery has high energy density and light weight, which reduces the size and weight of the system, making the system easy to carry.
  • the nuclear magnetic resonance measurement system for detecting the aging degree of the composite insulator can accurately detect the aging degree of the composite insulator shed.

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Abstract

一种用于复合绝缘子伞裙老化程度检测的核磁共振检测系统包括：NMR传感器、双工器、NMR谱仪、控制器、输入设备、输出设备和电源，所述控制器设置为在接收的控制命令为启动指令时，控制NMR谱仪生成射频激励信号；所述NMR传感器设置为在接收到所述射频激励信号后，在被测区域建立静态磁场和射频激励磁场，且检测核磁共振回波信号；所述双工器设置为进行射频激励信号传输和核磁共振回波信号传输之间的切换；所述NMR谱仪设置为对所述核磁共振回波信号进行指数反演处理，得到横向弛豫时间，以及根据所述横向弛豫时间得到复合绝缘子伞裙的老化程度。

Description

用于复合绝缘子老化程度检测的核磁共振测量系统 技术领域
本公开涉及复合绝缘子老化检测技术领域，例如，涉及一种用于复合绝缘子老化程度检测的核磁共振测量系统。
背景技术
复合绝缘子由于其重量轻、机械强度高、不易破碎以及耐污性能好的性能广泛应设置为高压输电线路中。复合绝缘子伞裙是复合绝缘子的外绝缘，用来保护芯棒不受大气的侵蚀，提供必要的爬电距离，并提高耐污性能。在挂网运行过程中，复合绝缘子伞裙在承受电网过电压和自然环境的侵蚀下可能老化或被击穿，老化或被击穿的复合绝缘子伞裙降低了供电的安全性，所以复合绝缘子伞裙老化程度的检测意义重大。
相关技术中，复合绝缘子伞裙老化的检测方法有观察法、喷水分级法、泄漏电流法、接触角法以及热刺激电流法。其中，观察法和HC喷水分级法易受到检修人员的主观判断影响，可靠性差。泄露电流法中影响电流大小的因素复杂，随机性大，检测结果不可靠。接触角法和热刺激电流法对测试环境的要求都很高，可以设置为实验室条件下的离线测量，操作复杂。
随着我国电压等级的不断提高和大电网间的互联，电力系统对供电可靠性提出了更高的要求，迫切需要一种能够对复合绝缘子伞裙老化程度进行检测的方法。
发明内容
本公开提出一种设置为复合绝缘子老化程度检测的核磁共振测量系统，能够在线准确检测复合绝缘子伞裙的老化程度。
一种设置为核磁共振检测系统，包括：核磁共振NMR传感器、双工器、NMR谱仪、控制器、输入设备、输出设备和电源，其中，
所述输入设备设置为接收用户输入的控制命令，并将所述控制命令发送至 所述控制器；
所述控制器设置为在接收的控制命令为启动指令时，控制所述NMR谱仪生成射频激励信号，并将所述射频激励信号通过所述双工器发送至所述NMR传感器，以及将所述NMR传感器检测到的核磁共振回波信号通过所述双工器发送至所述NMR谱仪；
所述NMR传感器设置为在接收到所述射频激励信号后，在被测区域建立静态磁场和射频激励磁场，且检测核磁共振回波信号；
所述双工器设置为进行射频激励信号传输和核磁共振回波信号传输之间的切换；
所述NMR谱仪设置为对所述核磁共振回波信号进行指数反演处理，得到横向弛豫时间，以及根据所述横向弛豫时间得到所述复合绝缘子伞裙的老化程度；
所述输出装置设置为输出所述复合绝缘子伞裙的老化程度数据；以及
所述电源设置为为所述控制器和所述NMR谱仪供电。
可选的，所述系统还包括：连接在所述NMR谱仪和所述双工器之间的功率放大器，其中，所述功率放大器对所述NMR谱仪发送的射频激励信号进行功率放大后，再通过所述双工器发送功率放大的射频激励信号至所述NMR传感器。
可选的，所述系统还包括：连接在所述NMR谱仪和所述双工器之间的前置放大器，其中，所述前置放大器放大核磁共振回波信号后，再发送放大的核磁共振回波信号至所诉NMR谱仪。
可选的，所述系统还包括：与所述控制器连接的通用串行总线USB数据传输设备，其中，所述USB数据传输设备设置为连接移动存储设备。
可选的，所述控制器为基于高级精简指令集计算机处理器ARM内核的32位单片机。
可选的，所述输入设备和所述输出设备分别为触摸屏。
可选的，所述NMR谱仪包括：锁相放大器，以及所述锁相放大器采用相敏检波方法检测核磁共振回波信号。
可选的，所述电源为锂电池。
附图说明
图1为第一实施例提供的第一种设置为复合绝缘子伞裙老化程度检测的核磁共振检测系统的结构示意图；
图2为一实施例提供的第二种设置为复合绝缘子伞裙老化程度检测的核磁共振检测系统的结构示意图；
图3为一实施例提供的第三种设置为复合绝缘子伞裙老化程度检测的核磁共振检测系统的结构示意图；以及
图4为一实施例提供的第四种设置为复合绝缘子伞裙老化程度检测的核磁共振检测系统的结构示意图。
具体实施方式
一实施例中，从材料学角度，采用核磁共振技术来实现复合绝缘子伞裙老化程度检测。核磁共振技术作为一种无损检测手段，广泛应用于生命医疗、食品分析、质量控制、材料科学领域和地球物理领域。核磁共振技术利用H原子核的磁共振特性，得到H核的磁共振波谱(Magnetic Resonance Spectroscopy，MRS)，并根据MRS的一些特征，如谱线的宽度、形状与面积来了解原子核的性质和所处的环境，确定分子结构。
一实施例提供了一种用于复合绝缘子伞裙老化程度检测的核磁共振检测系统，图1示出了该系统的结构示意图，该装置包括：核磁共振(Nuclear Magnetic Resonance，NMR)传感器11、双工器12、NMR谱仪13、控制器14、输入装置(也称输入设备)15、输出装置(也称输出设备)16和电源17。
输入装置15设置为接收用户输入的控制命令，并将所述控制命令发送至控制器14。
控制器14设置为在接收到的控制命令为启动指令时，控制NMR谱仪13生成射频激励信号，并将所述射频激励信号通过双工器12发送至NMR传感器11，以及将NMR传感器11检测到的核磁共振回波信号通过双工器12发送至NMR谱仪13。
NMR传感器11设置为在接收到所述射频激励信号后，在被测区域建立静态磁场和射频激励磁场，且检测核磁共振回波信号。
双工器12设置为进行射频激励信号传输和核磁共振回波信号传输之间的切换。
NMR谱仪13设置为对所述核磁共振回波信号进行指数反演处理，得到横向弛豫时间，根据所述横向弛豫时间得到所述复合绝缘子伞裙的老化程度。
输出装置16设置为输出所述复合绝缘子伞裙的老化程度。
电源17设置为为控制器14和NMR谱仪13供电。
复合绝缘子的伞裙的分子中的氢原子核的状态是固定的，横向弛豫时间T2是固定不变的。当复合绝缘子伞裙发生老化后，复合绝缘子伞裙的分子链发生断裂、重组等化学变化，氢原子核的状态便发生了变化。测量得到的横向弛豫时间T2也可能发生了变化，本实施例通过测量横向弛豫时间T2得到复合绝缘子伞裙的老化程度。
上述实施例提供的用于复合绝缘子伞裙老化程度检测的核磁共振检测系统，利用核磁共振技术从微观方面定量分析复合绝缘子伞裙的老化程度，提高了检测结果的准确度。NMR传感器检测正在运行的复合绝缘子伞裙，能够实现在线检测(工程现场检测)，提高了复合绝缘子伞裙老化程度检测的工作效率，以及提高了供电可靠性。
一实施例提供一种用于复合绝缘子伞裙老化程度检测的核磁共振检测系统，图2示出了该系统的结构示意图，在上述实施例的基础上，该系统还包括连接在NMR谱仪13和双工器12之间的功率放大器18。功率放大器18对NMR谱仪13发送的射频激励信号进行功率放大后再通过双工器12发送功率放大的射频激励信号至NMR传感器11，使得射频能量能激励样品产生核磁共振回波信号。
一实施例提供一种设置为复合绝缘子伞裙老化程度检测的核磁共振检测系统，图3示出了该系统的结构示意图，在图2的基础上，该系统还包括连接在NMR谱仪13和双工器12之间的前置放大器19。前置放大器19放大核磁共振回波信号后，再发送放大的核磁共振回波信号至NMR谱仪13，便于NMR谱仪 13检测核磁共振回波信号。
一实施例提供一种用于复合绝缘子伞裙老化程度检测的核磁共振检测系统，图4示出了该系统的结构示意图，在图3的基础上，该系统还包括与控制器14连接通用串行总线(Universal Serial Bus，USB)数据传输模块(也称USB数据传输设备)20。USB)数据传输模块20设置为连接移动存储设备。通过USB数据传输模块20可以将检测结果拷贝至移动存储设备。
可选的，控制器14为基于高级精简指令集计算机(Reduced Instruction Set Computer，RISC)处理器(Advanced RISC Machine，ARM)内核的32位单片机。由于基于ARM内核的32位的单片机的集成度高，信号处理速度快，集成有多中外围电路，减小了上述系统的体积，使得系统便于携带。
可选的，输入装置15和输出装置16为触摸屏。使用触摸屏提供人机交互。可以通过点击触摸屏进行一系列的操作，处理后的数据和图形在显示屏上显示，显明易懂。
可选的，NMR谱仪13包括锁相放大器，锁相放大器采用相敏检波方法检测核磁共振回波信号。锁相放大器采用相敏检波方法检测核磁共振回波信号，提高了上述系统抑制抑制噪声的性能。锁相放大器采用同步相干检测原理，即利用和被测信号有相同频率和相位关系的参考信号作为比较基准，只对被测信号本身和与参考信号同频(或者倍频)和同相的噪声分量有响应。因此，锁相放大器能抑制无用噪声，改善检测信噪比。
可选的，电源17为锂电池。锂电池能量密度高、重量轻，减小了系统的体积和重量，使得系统便于携带。
工业实用性
用于复合绝缘子老化程度检测的核磁共振测量系统，能够在线准确检测复合绝缘子伞裙的老化程度。

Claims (8)

  1. 一种用于复合绝缘子伞裙老化程度检测的核磁共振检测系统，包括：核磁共振NMR传感器、双工器、NMR谱仪、控制器、输入设备、输出设备和电源，其中，
    所述输入设备设置为接收用户输入的控制命令，并将所述控制命令发送至所述控制器；
    所述控制器设置为在接收的控制命令为启动指令时，控制所述NMR谱仪生成射频激励信号，并将所述射频激励信号通过所述双工器发送至所述NMR传感器，以及将所述NMR传感器检测到的核磁共振回波信号通过所述双工器发送至所述NMR谱仪；
    所述NMR传感器设置为在接收到所述射频激励信号后，在被测区域建立静态磁场和射频激励磁场，且检测核磁共振回波信号；
    所述双工器设置为进行射频激励信号传输和核磁共振回波信号传输之间的切换；
    所述NMR谱仪设置为对所述核磁共振回波信号进行指数反演处理，得到横向弛豫时间，以及根据所述横向弛豫时间得到所述复合绝缘子伞裙的老化程度；
    所述输出装置设置为输出所述复合绝缘子伞裙的老化程度数据；以及
    所述电源设置为为所述控制器和所述NMR谱仪供电。
  2. 根据权利要求1所述的系统，还包括：连接在所述NMR谱仪和所述双工器之间的功率放大器，其中，所述功率放大器对所述NMR谱仪发送的射频激励信号进行功率放大后，再通过所述双工器发送功率放大的射频激励信号至所述NMR传感器。
  3. 根据权利要求1所述的系统，还包括：连接在所述NMR谱仪和所述双 工器之间的前置放大器，其中，所述前置放大器放大核磁共振回波信号后，再发送放大的核磁共振回波信号至所诉NMR谱仪。
  4. 根据权利要求1所述的系统，还包括：与所述控制器连接的通用串行总线USB数据传输设备，其中，所述USB数据传输设备设置为连接移动存储设备。
  5. 根据权利要求1所述的系统，其中，所述控制器为基于高级精简指令集计算机处理器ARM内核的32位单片机。
  6. 根据权利要求1所述的系统，其中，所述输入设备和所述输出设备分别为触摸屏。
  7. 根据权利要求1所述的系统，其中，所述NMR谱仪包括：锁相放大器，以及所述锁相放大器采用相敏检波方法检测核磁共振回波信号。
  8. 根据权利要求1所述的系统，其中，所述电源为锂电池。
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