CN211785215U - Composite post insulator interface defect detection system based on microwave reflection signals - Google Patents
Composite post insulator interface defect detection system based on microwave reflection signals Download PDFInfo
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- CN211785215U CN211785215U CN201921006452.5U CN201921006452U CN211785215U CN 211785215 U CN211785215 U CN 211785215U CN 201921006452 U CN201921006452 U CN 201921006452U CN 211785215 U CN211785215 U CN 211785215U
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Abstract
The utility model discloses a composite post insulator interface defect detecting system based on microwave reflection signal, including direct current source, microwave source, guided wave device, directional coupler, low frequency amplifier, signal acquisition card and computer, direct current source connects in the microwave source, and the microwave source is connected in guided wave device, guided wave device and is connected in directional coupler, and directional coupler connects in the low frequency amplifier, and the low frequency amplifier is connected in signal acquisition card, and signal acquisition card connects in the computer, and directional coupler still connects in the sample that awaits measuring. The utility model discloses according to the propagation characteristic of microwave in the solid medium, utilize the reflection wave and interface performance's correspondence, realize that polyurethane fills the aassessment of post insulator interface performance and detect. The microwaves can penetrate into most non-conductive materials; the microwave detection does not need a coupling medium, and the effective coupling of the probe to the test piece can be directly realized through air; the phase amplitude of the microwave is easily obtained and the signal is easily processed.
Description
Technical Field
The utility model relates to a composite post insulator interface defect detecting system based on microwave reflection signal.
Background
As a novel composite post insulator, the polyurethane-poured composite post insulator has been applied in large quantities to bus posts and isolator post insulators of a plurality of key projects in China since the development. The typical composite post insulator is generally made of three insulating dielectric materials, namely an outer vulcanized silicone rubber sheath (including a shed part), a middle ring of cylindrical epoxy and polyurethane foam filled in the cylinder with the largest volume ratio. In the insulating structure, three materials with different excellent physical properties guarantee the most basic and important performance requirements of the insulator such as electrical insulating strength, mechanical strength, aging resistance and the like to the greatest extent, and meanwhile, on the basis, the great reduction of the quality of the insulator caused by the use of polyurethane is also an important reason that the insulator is hot in application.
However, even such a composite post insulator which is apparently good in all aspects of performance is not a perfect one, and the conventional operation and maintenance needs to try to detect, find and eliminate the fault defect and other problems therein so as to ensure the safety and reliability of the insulator to the maximum extent. From the basic structure of the polyurethane pouring type composite post insulator, it can be known that one of the most easily caused defects of the stacked layered structure of three materials is a defect at the interface of different materials, and the defect is often represented by non-fit and material loss at the interface. The existence of the defect can distort an electric field in the post insulator, and can cause partial discharge and even cause the breakdown of the post insulator when the partial discharge is serious, so that the defect brings great hidden danger to the safe and stable operation of the power system. The existing defect detection methods comprise an ultrasonic method, a terahertz flaw detection method and the like.
The ultrasonic method requires a probe to be in close contact with the surface of a sample and ensures the propagation of ultrasound using a coupling agent. The surface shape of the composite insulator is complex, and a test probe is difficult to be fixedly connected to the outer surface of the insulator; the contact-only measurement, especially the need to use a coupling agent during the measurement, limits the scope of application of ultrasound detection.
In the existing terahertz flaw detection methods, the refractive index of a sample is obtained in advance, and the process not only increases the operation complexity but also brings more error factors; or a first-order echo component needs to be introduced, which not only puts strict requirements on experimental conditions, such as completely reducing the influence of water vapor absorption to enable the relative humidity to be close to zero and the test piece window of the system to be wide enough; the thickness range of the measured sample is also severely limited because the first order echo is not obtained from the time domain waveform due to the negligible fabry-perot when the thickness of the sample is optically large relative to the wavelength.
Therefore, due to the concealment of the defect position of the polyurethane pouring type composite post insulator, the effect of adopting the conventional defect detection method may be poor in the indexes such as accuracy, feasibility and easy operability.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a composite post insulator interface defect detecting system based on microwave reflection signal to accomplish the aassessment work to polyurethane perfusion type composite post insulator interface state under higher detection accuracy and maneuverability requirement.
The utility model provides a technical scheme that its technical problem adopted is: constructing a composite post insulator interface defect detection system based on microwave reflection signals, which comprises a direct current source, a microwave source, a guided wave device, a directional coupler, a low-frequency amplifier, a signal acquisition card and a computer, wherein the direct current source is connected with the microwave source, the microwave source is connected with the guided wave device, the guided wave device is connected with the directional coupler, the directional coupler is connected with the low-frequency amplifier, the low-frequency amplifier is connected with the signal acquisition card, the signal acquisition card is connected with the computer, and the directional coupler is also connected with a sample to be detected; the direct current source is used for providing working voltage for the microwave source; the microwave source is used for generating high-frequency microwaves; the guided wave device is used for sending the high-frequency microwave to the sample to be detected through the directional coupler; the directional coupler is used for separating reflected waves of the sample to be detected; the low-frequency amplifier is used for processing the reflected wave and then sending the processed reflected wave to the signal acquisition card; the data acquisition card is used for reading the direct-current voltage signal output by the low-frequency amplifier into a digital signal and inputting the digital signal into the computer; and the computer is used for calculating the microwave reflected wave intensity amplitude according to the digital signal, performing subsequent data analysis according to a sample database, and judging whether the interface has defects and the positions of the defects.
In the composite post insulator interface defect detection system based on microwave reflection signals, the microwave source is full solid state microwave.
In the composite post insulator interface defect detection system based on microwave reflection signals, the wave guide device is a metal waveguide tube.
The composite post insulator interface defect detection system based on microwave reflection signals further comprises a detector connected between the directional coupler and the low-frequency amplifier.
The utility model discloses a sampling device that is used for online boron meter of nuclear power plant to markd has following beneficial effect: the utility model provides a composite post insulator interface defect detecting system based on microwave reflection signal utilizes the reflection wave and interface performance's correspondence according to the propagation characteristic of microwave in the solid medium, realizes that polyurethane fills the aassessment of post insulator interface performance and detects. The interaction between the microwave and the material is influenced by the characteristics of the material such as conductivity, dielectric constant, magnetic conductivity and the like, and macroscopically shows the effects of reflection, refraction, diffraction, scattering and the like; the microwaves can penetrate into most non-conductive materials; the microwave detection does not need a coupling medium, the effective coupling from the probe to the test piece can be directly realized through air, and even the contact between the probe and the test piece is not needed; the phase amplitude of the microwave is easy to obtain, and the signal is easy to process; the microwave system can be composed of solid-state devices, and can be portable, firm, reliable and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a schematic diagram of the composite post insulator interface defect detection system based on microwave reflection signals provided by the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the specific features in the embodiments and examples of the present invention are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present invention can be combined with each other without conflict.
Fig. 1 is a schematic diagram of the composite post insulator interface defect detection system based on microwave reflection signals provided by the present invention. As shown in fig. 1, the utility model provides a composite post insulator interface defect detecting system based on microwave reflection signal, including direct current source 10, microwave source 20, guided wave device 30, directional coupler 40, low frequency amplifier 50, signal acquisition card 60 and computer 70, direct current source 10 connect in microwave source 20, microwave source 20 connect in guided wave device 30 connect in directional coupler 40, directional coupler 40 connect in low frequency amplifier 50, low frequency amplifier 50 connect in signal acquisition card 60, signal acquisition card 60 connect in computer 70, directional coupler 40 still connects in the sample that awaits measuring.
Specifically, in one embodiment of the present invention, the dc source 10 provides a voltage that is sufficient for the operation of the microwave source 20.
Specifically, in one embodiment of the present invention, the microwave source 20 is used to generate microwave oscillation, and the conventional microwave oscillator includes two parts, namely an electric vacuum device and a solid-state device. The utility model discloses in use be the full solid state microwave source. The full solid state microwave source has the advantages of greatly reduced volume, weight and power consumption, and greatly improved service life and reliability. Solid state devices at frequencies above 4GHz have body effect diodes and collisional avalanche transit time diodes. The body-effect tube is also called a gunn diode. The principle of the avalanche diode is that reverse voltage of the diode is added to an avalanche region, and due to the transition time of the existence of carriers, alternating current voltage and alternating current are opposite in phase, and two ends of the diode present alternating current negative resistance to external characteristics to generate microwave oscillation.
Specifically, in an embodiment of the present invention, the microwave belongs to a high frequency electromagnetic wave, and cannot be simply propagated by using a wire, and when the microwave is transmitted and received by using an antenna and is propagated through a space, since the propagation of the microwave is affected by the medium distribution in the space and a large part of energy is easily lost, a specially-made element is required for transmission, that is, a microwave transmission line. Therefore, in the present invention, the waveguide device 30 is a metal waveguide. More specifically, the most widely used is the rectangular waveguide.
Specifically, in an embodiment of the present invention, the directional coupler 40 is a directional power distribution element, which can distribute and extract power of the forward-transmitted microwave signal in the main transmission system according to a certain proportion, and can basically not distribute and extract power from the backward wave.
Specifically, in an embodiment of the present invention, the present invention further includes a detector connected between the directional coupler and the low frequency amplifier. The detector is a component for detecting microwave power by using the nonlinear characteristics of some solid-state devices to generate direct current or low-frequency current and voltage.
Specifically, in an embodiment of the present invention, the dc (including a certain amount of low frequency signals) voltage signal outputted from the detector is filtered by the low frequency amplifier 50 to amplify the dc signal. The ability to identify defects may be improved after the low frequency amplifier is switched in.
Specifically, in an embodiment of the present invention, the data acquisition card 40 reads the dc voltage signal output by the low frequency amplifier as a digital signal, and inputs the digital signal to the computer.
Specifically, in an embodiment of the present invention, the computer 70 performs subsequent data analysis by combining the obtained microwave reflected wave intensity amplitude with the batch of sample databases, and can determine whether the interface has a defect and a defect position.
The utility model provides a composite post insulator interface defect detecting system based on microwave reflection signal utilizes the reflection wave and interface performance's correspondence according to the propagation characteristic of microwave in the solid medium, realizes that polyurethane fills the aassessment of post insulator interface performance and detects. The interaction between the microwave and the material is influenced by the characteristics of the material such as conductivity, dielectric constant, magnetic conductivity and the like, and macroscopically shows the effects of reflection, refraction, diffraction, scattering and the like; the microwaves can penetrate into most non-conductive materials; the microwave detection does not need a coupling medium, the effective coupling from the probe to the test piece can be directly realized through air, and even the contact between the probe and the test piece is not needed; the phase amplitude of the microwave is easy to obtain, and the signal is easy to process; the microwave system can be composed of solid-state devices, and can be portable, firm, reliable and the like.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (4)
1. A composite post insulator interface defect detection system based on microwave reflection signals is characterized by comprising a direct current source, a microwave source, a guided wave device, a directional coupler, a low-frequency amplifier, a signal acquisition card and a computer, wherein the direct current source is connected with the microwave source, the microwave source is connected with the guided wave device, the guided wave device is connected with the directional coupler, the directional coupler is connected with the low-frequency amplifier, the low-frequency amplifier is connected with the signal acquisition card, the signal acquisition card is connected with the computer, and the directional coupler is further connected with a sample to be detected; the direct current source is used for providing working voltage for the microwave source; the microwave source is used for generating high-frequency microwaves; the guided wave device is used for sending the high-frequency microwave to the sample to be detected through the directional coupler; the directional coupler is used for separating reflected waves of the sample to be detected; the low-frequency amplifier is used for processing the reflected wave and then sending the processed reflected wave to the signal acquisition card; the data acquisition card is used for reading the direct-current voltage signal output by the low-frequency amplifier into a digital signal and inputting the digital signal into the computer; and the computer is used for calculating the microwave reflected wave intensity amplitude according to the digital signal, performing subsequent data analysis according to a sample database, and judging whether the interface has defects and the positions of the defects.
2. The microwave-reflected-signal-based composite post insulator interface defect detection system of claim 1, wherein the microwave source is a fully solid-state microwave source.
3. The microwave-reflected-signal-based composite post insulator interface defect detection system of claim 1, wherein the wave guide device is a metal waveguide.
4. The microwave-reflected-signal-based composite post insulator interface defect detection system of claim 1, further comprising a detector connected between the directional coupler and the low frequency amplifier.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113759221A (en) * | 2021-08-27 | 2021-12-07 | 江苏省电力试验研究院有限公司 | Terahertz sensor chip for insulator monitoring and insulator monitoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113759221A (en) * | 2021-08-27 | 2021-12-07 | 江苏省电力试验研究院有限公司 | Terahertz sensor chip for insulator monitoring and insulator monitoring method |
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