CN107015125A - It is a kind of based on infrared, Uv and visible light integrated detection method and device - Google Patents

Abstract

The invention discloses an integrated detection method based on infrared, ultraviolet and visible light, which includes collecting infrared signals and ultraviolet signals respectively, and processing the infrared signals and ultraviolet signals respectively; Carry out comprehensive positioning to obtain fault diagnosis; separately collect ultrasonic signals and video signals, and process the ultrasonic signals and video signals respectively; perform ultrasonic partial discharge processing to obtain fault alarm information according to the processed ultrasonic signals and video signals; The fault diagnosis results and fault alarm results are sent to the detection platform. Therefore, the integrated detection method based on infrared, ultraviolet and visible light can timely deal with and warn of defects and potential safety hazards of transmission lines.

Description

An integrated detection method and device based on infrared, ultraviolet and visible light

technical field

The invention relates to the technical field of electric power detection, in particular to an integrated detection method based on infrared, ultraviolet and visible light.

Background technique

After the high-voltage equipment is put into operation, due to reasons such as rough and uneven surface, pollution, structural defects, and poor conductor contact, the field strength of the equipment will be unevenly distributed, resulting in discharge and heating phenomena such as corona and arcing. The equipment discharge and heating caused by insulation problems consume a considerable amount of electric energy, and the accompanying pulse electromagnetic waves interfere with the normal operation of radio and high-frequency communications, and stimulate air chemical reactions, and the generated substances damage the organic insulation of equipment. It is very likely to cause an insulation accident. At the same time, the generation of corona means that the insulation of the equipment may be weakened or defective. Timely detection of discharge and heating phenomena and inspection of the discharge location and strength of the equipment are of great value to the safe operation of the system. Therefore, partial discharge and power equipment temperature detection technology has been paid more and more attention by electric power scientific research institutions and operation departments.

At present, corona and arc discharge will be accompanied by electricity, light, heat, sound waves, compounds, etc. The techniques of using these characteristic signals to detect partial discharge of electrical equipment include observation method, ultrasonic method, infrared imaging method, photometric method, insulating oil chromatography analysis method, ultraviolet imaging method, etc. Among them, infrared detection is a relatively mature detection method for power equipment heating due to faults, and ultraviolet imaging is a new technology to identify the insulation status of power equipment by detecting corona and arc discharge. However, the infrared imaging method is an indirect measurement method, and the discharge cannot be directly seen; the ultraviolet imaging technology cannot quantitatively analyze the discharge of the equipment, and cannot make accurate judgments on equipment defects, all of which have certain defects.

Contents of the invention

In view of this, the object of the present invention is to propose an integrated detection method based on infrared, ultraviolet and visible light, which can accurately determine the discharge position of high-voltage equipment and quantitatively analyze the severity of defects in high-voltage equipment.

Based on the above purpose, the present invention provides an integrated detection method based on infrared, ultraviolet and visible light, including:

collecting infrared signals and ultraviolet signals respectively, and processing the infrared signals and ultraviolet signals respectively; performing comprehensive positioning according to the processed infrared signals and ultraviolet signals, and obtaining fault diagnosis;

collecting ultrasonic signals and video signals respectively, and processing the ultrasonic signals and video signals respectively; performing ultrasonic partial discharge processing according to the processed ultrasonic signals and video signals to obtain fault alarm information;

Send fault diagnosis results and fault alarm results to the detection platform.

In some embodiments of the present invention, the processing of the ultraviolet signal adopts calculation to take images, and obtains the coordinates (XUV, YUV) of the center point of the ultraviolet channel of the reticle image and the coordinates (XVIS, YVIS) of the center point of the visible light, and subtract the two Get the coordinate difference (dx, dy); W, H, θW, θH are instrument parameters; then, calculate the maximum stacking angle deviation dθ according to formula (1):

Among them, dθ——maximum stacking angle deviation; dx——coordinate deviation in horizontal direction; dy——coordinate deviation in vertical direction; W——number of horizontal pixels; H——number of vertical pixels; θ _W ——angle of view in horizontal direction ; θ _H —— vertical field of view angle.

In some embodiments of the present invention, the test must be carried out in a darkroom for the ultraviolet signal test; turn on the solar-blind ultraviolet monochromatic light source, use a power meter to measure the luminous power W of the light source, and record the photosensitive surface diameter d of the power meter; Place the attenuation device in the transmission direction of the spectroscopic mirror of the ultraviolet monochromatic light source; turn on the solar-blind ultraviolet imager, adjust the gain of the instrument to the maximum value, and gradually reduce the attenuation density of the attenuation device until the instrument can detect the ultraviolet signal, and record the attenuation at this time Density xOD, the sensitivity value is calculated by the formula:

Among them, E _min ——ultraviolet light detection sensitivity; W——luminous power of light source; d——diameter of photosensitive surface of power meter.

In some embodiments of the present invention, during the discharge detection of the ultraviolet imager, a sun-blind ultraviolet imager is used to image the position of the needle tip at a position 10m away from the partial discharge needle plate, and the gain is adjusted to the maximum; a pulse correction generator is used to inject a fixed amount of charge into the loop Obtain the pulse signal amplitude on the oscilloscope of the partial discharge meter, so as to obtain the correction curve of the apparent discharge capacity; turn on the power supply, boost the test circuit until the gap between the needle plate and obvious discharge appears; gradually reduce the test voltage until the day The blind ultraviolet imager can just distinguish the needle plate discharge signal, and record the apparent discharge amount at this time, which is the discharge detection sensitivity of the instrument.

In some embodiments of the present invention, when measuring the angular resolution of the ultraviolet channel of the solar-blind ultraviolet imager at a specified distance and the number of lines per image height, the distance x between the resolution target plate and the focal plane of the collimator is adjusted so that the resolution The target plate is imaged at a distance d meters away from the solar-blind ultraviolet imager, and the focal length f is recorded. The moving distance x is calculated according to the formula;

Among them, x—moving distance; f—focal length; d—distance between UV imager resolution targets;

Then, the solar-blind ultraviolet imager images the outgoing light of the ultraviolet collimator, adjusts the gain and focus of the solar-blind ultraviolet imager to a suitable gear, and records the clearly distinguishable minimum spacing stripe label M;

The angular resolution value of the solar-blind ultraviolet imager and the number of lines per image height are calculated by the following formulas respectively. Among them, dx and dy are obtained by subtracting the coordinates of the center point of the ultraviolet channel (XUV, YUV) of the reticle image and the coordinates of the center point of visible light (XVIS, YVIS), and W, H, θW, θH are instrument parameters

Among them, dx—the distance between the centers of adjacent stripes in the horizontal direction; dy—the distance between the centers of adjacent stripes in the vertical direction; _W —the number of pixels in the horizontal direction; H—the number of pixels in the vertical direction; Field angle; θ _H ——field angle in the vertical direction; R _h ——the number of lines per image height in the horizontal direction; R _v ——the number of lines per image height in the vertical direction.

In some embodiments of the present invention, space isolation and optical fiber isolation are used for infrared temperature measurement.

In some embodiments of the present invention, the video signal is collected by a camera.

In some embodiments of the present invention, the ultrasonic signal needs to be processed sequentially through the ultrasonic sensor array, the array signal amplification circuit and the multi-channel data acquisition card.

In some embodiments of the present invention, single-point or multi-point fault alarms are performed according to the processed ultrasonic signals and video signals.

It can be seen from the above that the integrated detection method based on infrared, ultraviolet and visible light provided by the present invention can be a comprehensive detection device that integrates the three detection methods of ultraviolet, infrared and visible light, combined with the respective imaging detection methods of ultraviolet and infrared It not only accurately determines the discharge position of high-voltage equipment, but also quantitatively analyzes the severity of high-voltage equipment defects. Through the detection of corona discharge intensity of electrical equipment, hidden dangers in equipment operation can be found in time, which can prevent and reduce equipment failures While ensuring the safety of testing personnel, it reduces the power outage time of equipment, improves the reliability of power supply, and ensures the stable and safe operation of the power grid.

Description of drawings

Fig. 1 is a schematic diagram of an integrated detection method based on infrared, ultraviolet and visible light in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the test circuit for the discharge detection sensitivity of the ultraviolet imager in the embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

As an example, refer to FIG. 1, which is a schematic flow chart of an integrated detection method based on infrared, ultraviolet and visible light in an embodiment of the present invention. The integrated detection method based on infrared, ultraviolet and visible light includes:

Step 101, collect infrared signals and ultraviolet signals respectively, and process the infrared signals and ultraviolet signals respectively.

In a preferred embodiment, the processing of the ultraviolet signal can use calculation to capture the image to obtain the center point coordinates (XUV, YUV) of the reticle image ultraviolet channel and the coordinates (XVIS, YVIS) of the center point of the visible light. Subtract to obtain coordinate difference (dx, dy); W, H, θW, θH are instrument parameters. Then, the maximum stacking angle deviation dθ is calculated according to formula (1).

Among them, dθ——maximum stacking angle deviation; dx——coordinate deviation in horizontal direction; dy——coordinate deviation in vertical direction; W——number of horizontal pixels; H——number of vertical pixels; θ _W ——angle of view in horizontal direction ; θ _H —— vertical field of view angle.

In another preferred embodiment, the infrared temperature measuring device generally works outdoors, and the ambient temperature varies greatly, which requires the detector to have good thermal stability. The detector can be installed away from the high-temperature area of the equipment, and installed in a place where the temperature of the conductive circuit is relatively low (generally below 80°C), thereby reducing the requirement for high-temperature resistance of the detector. At the same time, components with better thermal stability are selected, and temperature compensation is reasonably set on the analog signal channel to make the system achieve higher thermal stability.

In addition, to realize online monitoring of high-voltage equipment by infrared temperature measurement, the problem of high-voltage isolation must first be solved. Generally speaking, there are two ways to solve this problem: one is through space isolation, and the other is through fiber optic isolation. Space isolation, the signal can be transmitted by light or radio. In this paper, infrared light is used for signal transmission. It has the characteristics of complete isolation, simple structure, strong anti-interference ability, and reliable operation.

At the same time, the high-voltage switchgear for infrared temperature measurement operates in the state of high voltage and high current, and there is a strong electromagnetic transient process at the moment of the system accident, which generates strong electric field, magnetic field and strong electromagnetic interference, which is harmful to microelectronic systems and weak Signal handling is very bad. In order to eliminate these interferences, software and hardware anti-interference measures are adopted at the same time, digital coding and decoding technology is applied in software design, interference signals are eliminated, and software filtering technology is used; metal shielding is used in hardware to strengthen filtering at all levels to eliminate high frequency interference. The detector and the temperature measuring point are at the same potential to reduce the influence of the electric field. In addition, in order to eliminate random interference, using the characteristics of relatively slow temperature changes of the contacts, the detection point signal is repeatedly received, collected multiple times, and abnormal data is excluded to ensure data reliability. Through the above comprehensive measures, the whole machine has better anti-interference ability , The measured data is stable and reliable.

Step 102 , perform comprehensive positioning according to the processed infrared signal and ultraviolet signal to obtain fault diagnosis, and then proceed to step 105 .

In an embodiment, the test for the ultraviolet signal must be carried out in a darkroom (illuminance less than 0.0001lx); turn on the solar-blind ultraviolet monochromatic light source, use a power meter to measure the luminous power W of the light source, and record the photosensitive surface diameter d of the power meter; Place an attenuation device in the transmission direction of the spectroscopic mirror of the solar-blind ultraviolet monochromatic light source (the attenuation density is recommended to be above 10OD); turn on the solar-blind ultraviolet imager, adjust the gain of the instrument to the maximum value, and gradually reduce the attenuation density of the attenuation device until the instrument is just able to When the ultraviolet signal is detected, record the attenuation density x OD at this time, and the sensitivity value is calculated by the formula:

Among them, E _min ——ultraviolet light detection sensitivity; W——luminous power of light source; d——diameter of photosensitive surface of power meter.

In addition, the discharge detection sensitivity test circuit of the ultraviolet imager is shown in Figure 2, where S—needle plate discharge gap; R—protective resistance; C ₁ , C ₂ —capacitors; C _K —coupling capacitor; Z _m — - impedance unit; DPO - partial discharge tester. During detection, a sun-blind ultraviolet imager can be used to image the position of the needle tip at a distance of 10m from the partial discharge needle plate, and the gain can be adjusted to the maximum; a pulse correction generator can be used to inject a pulse signal with a fixed amount of charge into the circuit, and it can be obtained on the partial discharge instrument oscilloscope Pulse signal amplitude, so as to obtain the correction curve of apparent discharge; turn on the power supply, boost the test circuit until the gap between the needle plate and obvious discharge appears; gradually reduce the test voltage until the solar-blind ultraviolet imager can just distinguish the needle plate discharge Signal, record the apparent discharge at this time, which is the discharge detection sensitivity of the instrument.

In addition, when measuring the angular resolution of the ultraviolet channel of the sun-blind ultraviolet imager at a specified distance and the number of lines per image height, the distance x between the resolution target plate and the focal plane of the collimator can be adjusted, so that the resolution target plate imaging distance from the sun Blind the UV imager at d meters, and record the focal length f. The moving distance x is calculated according to the formula;

Among them, x—moving distance; f—focal length; d—distance between resolution targets of UV imager.

Then, the solar-blind ultraviolet imager images the outgoing light of the ultraviolet collimator, adjusts the gain and focus of the solar-blind ultraviolet imager to a suitable gear, and records the clearly distinguishable minimum spacing stripe mark M.

The angular resolution value of the solar-blind ultraviolet imager and the number of lines per image height can be calculated by the following formulas respectively. Among them, dx and dy are obtained by subtracting the coordinates of the ultraviolet channel center point (XUV, YUV) of the reticle image and the coordinates of the visible light center point (XVIS, YVIS), and W, H, θW, θH are instrument parameters.

Among them, dx—the distance between the centers of adjacent stripes in the horizontal direction; dy—the distance between the centers of adjacent stripes in the vertical direction; _W —the number of pixels in the horizontal direction; H—the number of pixels in the vertical direction; Field angle; θ _H ——field angle in the vertical direction; R _h ——the number of lines per image height in the horizontal direction; R _v ——the number of lines per image height in the vertical direction.

Step 103, respectively collect the ultrasonic signal and the video signal, and process the ultrasonic signal and the video signal respectively.

In a preferred embodiment, the video signal is collected by a camera. The ultrasonic signal needs to be processed sequentially through the ultrasonic sensor array, the array signal amplification circuit and the multi-channel data acquisition card. Wherein, the array signal amplifying circuit can amplify the ultrasonic signal processed by the ultrasonic sensor array, and the multi-channel data acquisition card can send the ultrasonic filtering to the ultrasonic partial discharge in step 104 for processing. Preferably, the acquisition and processing of the ultrasonic signal and video signal can be realized through the ultrasonic signal acquisition main board.

Step 104 , according to the processed ultrasonic signal and video signal, perform ultrasonic partial discharge processing to obtain fault alarm information, and then proceed to step 105 .

In an embodiment, according to the processed ultrasonic signal and video signal, a single-point or multi-point fault alarm can be performed, and step 105 can be performed. Preferably, ultrasound partial discharge visualization can be performed.

Step 105, sending the fault diagnosis result and the fault alarm result to the detection platform.

Wherein, the detection platform can comprehensively detect faults based on ultrasonic, ultraviolet, and infrared distribution networks.

It can be seen from the above description that the integrated detection method based on infrared, ultraviolet and visible light of the present invention creatively realizes the detection of three lights in one, realizes the detection of faults by infrared, the fault by ultraviolet, and the location by visible light; and, The photoelectric acquisition module of the ultraviolet detector includes two channels, one of which is an ultraviolet channel and the other is a visible light channel. A photoelectric acquisition module includes an ultraviolet camera and a visible light camera; moreover, the present invention predicts the partial discharge part of the equipment/line through the visualization device, and then uses the comprehensive diagnosis module for equipment with a higher fault severity/level Accurate analysis and diagnosis, thereby significantly improving the integrity of information and the accuracy of diagnosis; at the same time, the entire integrated detection method based on infrared, ultraviolet and visible light is compact and easy to implement.

Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is exemplary only, and is not intended to imply that the scope of the present disclosure (including claims) is limited to these examples; under the idea of the present invention, the above embodiments or Combinations between technical features in different embodiments are also possible, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not presented in detail for the sake of brevity.

In addition, well-known power/ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure the present invention. . Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and this also takes into account the fact that details regarding the implementation of these block diagram devices are highly dependent on the platform on which the invention is to be implemented (i.e. , these details should be well within the understanding of those skilled in the art). Where specific details (eg, circuits) have been set forth to describe example embodiments of the invention, it will be apparent to those skilled in the art that other embodiments may be implemented without or with variations from these specific details. Implement the present invention down. Accordingly, these descriptions should be regarded as illustrative rather than restrictive.

Although the invention has been described in conjunction with specific embodiments of the invention, many alternatives, modifications and variations of those embodiments will be apparent to those of ordinary skill in the art from the foregoing description. For example, other memory architectures such as dynamic RAM (DRAM) may use the discussed embodiments.

Embodiments of the present invention are intended to embrace all such alterations, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. An integrated detection method based on infrared, ultraviolet and visible light, characterized in that it comprises: collecting infrared signals and ultraviolet signals respectively, and processing the infrared signals and ultraviolet signals respectively; performing comprehensive positioning according to the processed infrared signals and ultraviolet signals, and obtaining fault diagnosis; collecting ultrasonic signals and video signals respectively, and processing the ultrasonic signals and video signals respectively; performing ultrasonic partial discharge processing according to the processed ultrasonic signals and video signals to obtain fault alarm information; Send fault diagnosis results and fault alarm results to the detection platform. 2. The method according to claim 1, characterized in that, the processing of the ultraviolet signal adopts calculation and shooting images to obtain the center point coordinates (XUV, YUV) of the reticle image ultraviolet channel and the coordinates (XVIS, YVIS) of the visible light center point ), the two are subtracted to obtain the coordinate difference (dx, dy); W, H, θW, θH are instrument parameters; then, calculate the maximum stacking angle deviation dθ according to the formula (1): Among them, dθ——maximum stacking angle deviation; dx——coordinate deviation in horizontal direction; dy——coordinate deviation in vertical direction; W——number of horizontal pixels; H——number of vertical pixels; θ _W ——angle of view in horizontal direction ; θ _H —— vertical field of view angle. 3. method according to claim 2, it is characterized in that, must carry out in darkroom for ultraviolet signal test test; Turn on solar-blind ultraviolet monochromatic light source, use power meter to measure light source luminous power W, and record the photosensitive surface of power meter Diameter d; place an attenuation device in the transmission direction of the spectroscope of the solar-blind ultraviolet monochromatic light source; turn on the solar-blind ultraviolet imager, adjust the gain of the instrument to the maximum value, and gradually reduce the attenuation density of the attenuation device until the instrument can just detect ultraviolet rays Signal, record the attenuation density xOD at this time, and the sensitivity value is calculated by the formula: Among them, E _min ——ultraviolet light detection sensitivity; W——luminous power of light source; d——diameter of photosensitive surface of power meter. 4. The method according to claim 3, characterized in that, during the discharge detection of the ultraviolet imager, a sun-blind ultraviolet imager is used to image the position of the needle tip at a distance of 10 m from the partial discharge needle plate, and the gain is adjusted to the maximum; a pulse correction generator is used Inject a pulse signal with a fixed amount of charge into the circuit, and obtain the amplitude of the pulse signal on the oscilloscope of the partial discharge meter, so as to obtain the correction curve of the apparent discharge amount; turn on the power supply, boost the test circuit until the gap between the needle and the plate appears obvious discharge; gradually reduce Reduce the test voltage until the solar-blind ultraviolet imager can just distinguish the needle-plate discharge signal, and record the apparent discharge at this time, which is the discharge detection sensitivity of the instrument. 5. method according to claim 4, it is characterized in that, when measuring the angular resolution of solar-blind ultraviolet imager ultraviolet channel and the number of high lines per image at specified distance, the distance between the resolution target plate and the collimator focal plane is adjusted. The distance x makes the imaging of the resolution target at a distance d meters away from the solar-blind ultraviolet imager, and records the focal length f. The moving distance x is calculated according to the formula; Among them, x—moving distance; f—focal length; d—distance between UV imager resolution targets; Then, the solar-blind ultraviolet imager images the outgoing light of the ultraviolet collimator, adjusts the gain and focus of the solar-blind ultraviolet imager to a suitable gear, and records the clearly distinguishable minimum spacing stripe label M; The angular resolution value of the solar-blind ultraviolet imager and the number of lines per image height are calculated by the following formulas respectively. Among them, dx and dy are obtained by subtracting the coordinates of the center point of the ultraviolet channel (XUV, YUV) of the reticle image and the coordinates of the center point of visible light (XVIS, YVIS), and W, H, θW, θH are instrument parameters Among them, dx—the distance between the centers of adjacent stripes in the horizontal direction; dy—the distance between the centers of adjacent stripes in the vertical direction; _W —the number of pixels in the horizontal direction; H—the number of pixels in the vertical direction; Field angle; θ _H ——field angle in the vertical direction; R _h ——the number of lines per image height in the horizontal direction; R _v ——the number of lines per image height in the vertical direction. 6. The method according to claim 1, characterized in that space isolation and optical fiber isolation are used for infrared temperature measurement. 7. The method according to claim 1, wherein the video signal is collected by a camera. 8. The method according to claim 1, wherein the ultrasonic signal needs to be processed sequentially through the ultrasonic sensor array, the array signal amplification circuit and the multi-channel data acquisition card. 9. The method according to claim 8, characterized in that, according to the processed ultrasonic signal and video signal, a single-point or multi-point fault alarm is performed.