CN113884194B - Dynamic contact net temperature detection system - Google Patents
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Abstract
The invention discloses a dynamic contact network temperature detection system which comprises a data acquisition module, an image processing module, a contact network position identification module, a contact network comprehensive defect comprehensive identification module, a monitoring terminal and a wireless transmission module.
Description
Technical Field
The invention relates to the field of power grid detection, in particular to a dynamic temperature detection system for a contact network.
Background
The main conductive loop of railway line contact network is formed from power supply line, return line, carrier cable, contact line, hanger and connecting line. The parts are connected by various wire clamps, so that the loop extends along the railway to meet the requirement of supplying power to the electric locomotive. The main conductive loop is good, so that the smoothness of current can be guaranteed, and if defects exist, the local current carrying is too large, parts are seriously shunted, so that the local temperature of a contact net is increased, the contact net equipment is burnt, and the faults occupy a larger proportion in the contact net faults. Various connecting wire clamps are weak links in a conductive loop of the contact network, the wire clamps can cause the increase of contact resistance due to oxidation, loosening of connecting screws and other reasons, local heating of wire clamp parts is caused, contact network equipment is burnt or the tensile strength of a cable is reduced due to heating, and cable breakage is caused.
At present, in a power supply operation unit, a heating point is generally judged by a manual inspection method through observing the change of a temperature measuring sheet and color changing paint by a telescope. The existing bow net detection device mainly detects the defects of an electric power receiver. Other thermographic on-board inspection solutions have not been applied in the field.
The heating of the contact net has great concealment, and is generally difficult to be found through observation, and the number of the wire clamps along the contact net is large, and the online monitoring of the installation temperature measuring device of each wire clamp is difficult to realize. The existing method needs to consume a large amount of human resources, is difficult to realize the regular observation and judgment of each wire clamp position, can only observe the position of a counterweight, and has the phenomenon of artificial misjudgment. Some prior art detect contact net and bow net junction temperature through thermal imaging, because the thermal imaging appearance adapts to the speed of a motor vehicle not high, miss some contact net defects and temperature measurement error great easily. Other thermal imaging vehicle-mounted detection equipment is low in adaptive speed and large in temperature measurement error, and is not applied in a large area.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a dynamic temperature detection system for a contact network.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a dynamic detection system for the temperature of a contact net comprises: a data acquisition module, an image processing module, a contact net position identification module, a contact net defect comprehensive identification module, a monitoring terminal and a wireless transmission module,
the data acquisition module is used for acquiring infrared imaging data, high-definition image data and environment information under corresponding pictures of the contact network and sending the acquired data and information to the image processing module;
the image processing module is used for carrying out image and mode identification according to the data and information acquired by the data acquisition module, positioning the highest temperature of the contact net in each frame of infrared image and positioning the corresponding position of the contact net;
the overhead line system comprehensive defect identification module is used for judging whether the overhead line system is in an abnormal state or not according to the processing result of the image processing module, and sending an instruction to the monitoring terminal and early warning according to whether the overhead line system is in the abnormal state or not;
the monitoring terminal receives the alarm data and performs sound-light early warning;
the wireless transmission module is used for sending abnormal data to the monitoring terminal.
The beneficial effect of above-mentioned scheme is: the dynamic detection system for the temperature of the contact network realizes non-contact real-time detection of the temperature distribution of the contact network by adopting a high-speed infrared thermal imaging technology, a high-definition video technology, an image processing technology, a mode identification technology and a sensor technology, accurately positions fault points by adopting a comprehensive positioning technology, and carries out remote data exchange processing by adopting a wireless communication technology, thereby realizing dynamic detection and overrun early warning of the temperature of the contact network.
Further, the data acquisition module is arranged on the roof of the locomotive and comprises a high-speed infrared camera, a high-definition visible light camera, an antenna and a protection device, wherein the high-speed infrared camera and the high-definition visible light camera are arranged in the protection device.
The beneficial effects of the further scheme are as follows: the thermal imager and the visible light camera are arranged in the protective box, and the antenna and the protective box are integrated, so that the roof equipment of the system can normally work in various severe environments, and the running safety of the locomotive is not influenced.
Furthermore, the contact net position identification module performs temperature extraction and temperature distributed calculation on the infrared image acquired by the high-speed infrared camera, and performs contact net feature identification and position determination on the contact net on the high-definition image acquired by the high-definition visible light camera.
The beneficial effects of the above further scheme are: the contact net position identification module can correctly identify the position of the contact net, ensure the accuracy of the extracted temperature and avoid misinformation and missing report.
Further, the calculation process of the contact network identification module is as follows:
sorting the temperature of each point in the image of the m x n size region;
the average value of the temperature of the contact net in the image is taken as a threshold value through a difference value algorithm to obtain the distribution of the contact net in the infrared image, and the calculation mode is as follows:
wherein p is the proportion of the overhead line system in the high-definition image, T (i) is the maximum temperature, and i is the number of the maximum temperature;
and determining the characteristics of the contact network by using a homogeneity algorithm to obtain the coordinate points of the contact network image.
The beneficial effects of the above further scheme are: and positioning the position of the contact net in the picture by utilizing the temperature difference between the contact net and the background environment and the linear characteristic of the contact net.
Further, the contact network defect comprehensive pattern recognition module carries out early warning on the actual contact network defects through a threshold value algorithm and a ratio algorithm on the basis of position recognition, the working mode of the contact network defect comprehensive pattern recognition module comprises high-temperature early warning and low-temperature early warning,
the working mode during high-temperature early warning is as follows:
mode 1: the collinear ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 30 ℃ plus X, the temperature is more than or equal to 60 ℃ plus X, and primary early warning is carried out;
mode 2: the synteny ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 40 ℃ plus X, the temperature is more than or equal to 80 ℃ plus X, and secondary early warning is carried out;
mode 3: the collinear ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 50 ℃ plus X, the temperature is more than or equal to 100 ℃ plus X, and three-stage early warning is carried out;
wherein the collinear ratio is the ratio of the temperature rise value of the regional contact net to the average value of the temperature rise values of different regions of the contact net, and is-1;
temperature rise = contact network temperature measured by thermal imager-ring temperature displayed by host;
temperature = temperature rise + ring temperature displayed by the host;
the value range of Y is [1,5], and the value range of X is [ -10,10];
the working mode during low-temperature early warning is as follows:
mode 1: the temperature is less than or equal to minus 5 ℃, and low-temperature primary early warning is carried out;
mode 2: the temperature is less than or equal to minus 10 ℃, and the low-temperature secondary early warning is carried out;
mode 3: the temperature is less than or equal to minus 15 ℃, and the low temperature is early-warning in three stages.
The beneficial effects of the further scheme are as follows: and performing overrun early warning on abnormal points of the contact network through a threshold value and ratio early warning model.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic temperature detection system of a contact network.
Fig. 2 is a schematic view of a mounting structure of a roof collecting device according to an embodiment of the invention.
Fig. 3 is a schematic view of a process of identifying the position of the overhead line system according to the embodiment of the present invention.
Fig. 4 is a schematic view of a contact network defect identification process in the embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
The utility model provides a contact net temperature dynamic verification system, as shown in figure 1, includes: a data acquisition module, an image processing module, a contact net position identification module, a contact net defect comprehensive identification module, a monitoring terminal and a wireless transmission module,
the data acquisition module is used for acquiring infrared imaging data, high-definition image data and environment information under corresponding pictures of the contact network and sending the acquired data and information to the image processing module;
the image processing module is used for carrying out image and mode identification according to the data and information acquired by the data acquisition module, positioning the highest temperature of the contact net in each frame of infrared image and positioning the corresponding position of the contact net;
the overhead line system comprehensive defect identification module is used for judging whether the overhead line system is in an abnormal state or not according to the processing result of the image processing module, and sending an instruction to the monitoring terminal and early warning according to whether the overhead line system is in the abnormal state or not;
the monitoring terminal receives alarm data and performs sound-light early warning;
and the wireless transmission module is used for sending abnormal data to the monitoring terminal.
Specifically, as shown in fig. 2, the data acquisition module is disposed on a roof of the locomotive and includes a high-speed infrared camera, a high-definition visible light camera, an antenna, and a protection device, wherein the high-speed infrared camera and the high-definition visible light camera are disposed in the protection device.
The roof equipment meets the IP68 waterproof grade requirement specified in GB4208, and the thermal imager and the visible light camera are installed in the protective box. The window glass and the excircle of the mechanical installation part are designed with a 1mm (single-side) gap, the gap is fixed by coating special sealing glue, and then the gap is compressed by a pressing ring, so that sealing can be ensured. Wherein, in order to prevent window glass from being scratched by sand dust, gravel and the like, the outer surface of the window glass is plated with a diamond-like film for protection.
The high-speed thermal imager is adapted to a vehicle speed test chart:
the temperature of the black body is set to be 100 ℃, the speed of 120KM/H is simulated through the high-speed turntable, the measured temperature becomes low when the turntable is shielded, and the measured temperature error is within 2 ℃ when the turntable is not shielded, so that the high-speed thermal imager can correctly respond to the temperature of a measured object.
The contact net position identification module is used for carrying out temperature extraction and temperature distributed calculation on the infrared images collected by the high-speed infrared camera and carrying out contact net characteristic identification on the high-definition images collected by the high-definition visible light camera so as to determine the position of the contact net. As shown in fig. 3, includes:
sorting the temperature of each point in the image of the m x n size region;
the average value of the maximum values in the image is taken as a threshold value through a difference value algorithm to obtain the distribution of the overhead contact system in the infrared image, and the calculation mode is as follows:
wherein p is the proportion of the overhead line system in the high-definition image, T (i) is the maximum temperature, and i is the number of the maximum temperature;
and determining the characteristics of the contact network by using a homogeneity algorithm to obtain the coordinate points of the contact network image.
The method comprises the steps of determining the characteristics of a contact network by a homogeneity algorithm, obtaining a gray image by carrying out linear conversion on an image color space, selecting a 3 x 3 mean filter for denoising, obtaining a value C (I, j) of each pixel point of the image, then thresholding I, defining the homogeneity as a range of I and a deviation value V, and finally obtaining the coordinates of the image points of the contact network.
The detector of the infrared thermal imager can convert the received thermal radiation energy of the infrared band into an electric signal, and the electric signal is amplified, shaped and converted into a digital signal through analog-to-digital conversion and displayed on a display through an image. The grey value of each point in the image corresponds to the radiation energy emitted by the point on the object to be measured and reaching the photoelectric conversion device.
The thermal image displayed by the infrared system on the display reflects the thermal distribution of the surface of the object to be measured, and when the absolute temperature of the object is to be obtained according to the thermal image, the absolute temperature value is calibrated by comparing with the thermal image of a reference object, and generally a relation curve between the temperature and the output signal (namely, the gray value) of the photoelectric conversion device is made by taking a high-precision black body as a standard. The following formula can be used here as a fitting model:
the original pixel data acquired by the detector is corrected by two points to obtain a new calibration gray value H (T) r ) Calculating the radiation temperature T of the surface of the object by combining the derivation of a fitted curve model r 。
But the temperature read directly from the image displayed by the infrared system is the radiation temperature T of the surface of the object r The value of which is equal to the true temperature of a black body radiating the same energy, and not the true temperature.
When temperature is measured at a close distance, the influence of environmental factors such as atmospheric transmittance is neglected, and according to the Planck's radiation theorem, the calculation formula of the real temperature of the measured surface can be expressed as follows:
wherein T is 0 Is the true temperature, T, of the surface of the object to be measured r Is the radiation temperature, T, of the surface of the object u Is the ambient temperature and epsilon is the surface emissivity of the object. The value of n can be different by using thermal imaging instruments with different wave bands.
Knowing the radiation temperature T of the surface of the object r And the surface emissivity epsilon is combined with a real temperature formula of the measured surface, and the actual temperature value T of the image element point can be calculated according to the surface radiation temperature and the environment temperature 0 。
The system can complete dynamic temperature measurement under the conditions of high speed and high frame frequency, temperature measurement errors are compensated and corrected by measuring the temperature of the reference baffle, different vehicle speeds and different environmental temperatures, the temperature measurement precision of the system is guaranteed, and error influence caused by environmental temperature change is reduced.
The overhead line system defect comprehensive pattern recognition module carries out early warning on actual overhead line system defects through a threshold value algorithm and a ratio algorithm on the basis of position recognition, the working mode of the overhead line system defect comprehensive pattern recognition module comprises high-temperature early warning and low-temperature early warning, as shown in figure 4, wherein,
threshold algorithm: according to the temperature characteristics that the contact net shows when normal operating temperature and unusual severity, set up different temperature threshold values, surpass different threshold values when the contact net temperature, carry out different rank early warnings.
The ratio algorithm: and when the ratio of the temperature rise value of a certain point of the overhead line system to the average temperature rise value of the nearby point exceeds a set threshold value, the point is considered to be abnormal.
The working mode during high-temperature early warning is as follows:
mode 1: the synteny ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 30 ℃ plus X, the temperature is more than or equal to 60 ℃ plus X, and the first-stage early warning is carried out;
mode 2: the collinear ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 40 ℃ plus X, the temperature is more than or equal to 80 ℃ plus X, and secondary early warning is carried out;
mode 3: the collinear ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 50 ℃ plus X, the temperature is more than or equal to 100 ℃ plus X, and three-stage early warning is carried out;
wherein the collinear ratio is the ratio of the temperature rise value of the regional contact net to the average value of the temperature rise values of different regions of the contact net, and is-1;
temperature rise = the temperature of the contact network measured by the thermal imager-the ambient temperature displayed by the host;
temperature = temperature rise + ring temperature displayed by the host;
the value interval of Y is [1,5], and the value interval of X is [ -10,10];
the working mode during low-temperature early warning is as follows:
mode 1: the temperature is less than or equal to minus 5 ℃, and the primary low-temperature early warning is carried out;
mode 2: the temperature is less than or equal to minus 10 ℃, and low-temperature secondary early warning is carried out;
mode 3: the temperature is less than or equal to minus 15 ℃, and the low temperature is early-stage warned.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (3)
1. The utility model provides a contact net temperature dynamic verification system which characterized in that includes: a data acquisition module, an image processing module, a contact net position identification module, a contact net defect comprehensive identification module, a monitoring terminal and a wireless transmission module,
the data acquisition module is used for acquiring infrared imaging data, high-definition image data and environment information under corresponding pictures of the contact network and sending the acquired data and information to the image processing module;
the image processing module is used for carrying out image mode identification according to the data and information acquired by the data acquisition module, positioning the highest temperature of the contact net in each frame of infrared image and positioning the corresponding position of the contact net;
the overhead line system comprehensive defect identification module is used for judging whether the overhead line system is in an abnormal state or not according to a processing result of the image processing module, and sending an instruction to the monitoring terminal and early warning according to whether the overhead line system is in the abnormal state or not;
the monitoring terminal receives alarm data and performs sound-light early warning;
the wireless transmission module is used for sending abnormal data to the monitoring terminal;
the contact net position identification module is through right the infrared image of data acquisition module carries out the temperature and draws and carry out temperature distribution formula and calculate, carries out contact net feature recognition and carries out position determination to the contact net to the high definition image of high definition visible light camera collection simultaneously, contact net identification module's calculation process is:
sorting the temperature of each point in the image of the m x n size region;
the average value of the maximum values in the image is taken as a threshold value through a difference value algorithm to obtain the distribution of the overhead contact system in the infrared image, and the calculation mode is as follows:
wherein p is the proportion of the overhead contact system in the high-definition image, T (i) is the maximum temperature, and i is the number of the maximum temperatures;
and determining the characteristics of the contact network by using a homogeneity algorithm to obtain the coordinate points of the contact network image.
2. The system for dynamically detecting the temperature of the overhead line system of claim 1, wherein the data acquisition module is arranged on the roof of the locomotive and comprises a high-speed infrared camera, a high-definition visible light camera, an antenna and a protection device, wherein the high-speed infrared camera and the high-definition visible light camera are arranged in the protection device.
3. The system of claim 1, wherein the catenary defect comprehensive pattern recognition module performs early warning on actual catenary defects through a threshold algorithm and a ratio algorithm on the basis of position recognition, and the working modes of the system comprise high-temperature early warning and low-temperature early warning,
the working mode during high-temperature early warning is as follows:
mode 1: the collinear ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 30 ℃ plus X, the temperature is more than or equal to 60 ℃ plus X, and primary early warning is carried out;
mode 2: the synteny ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 40 ℃ plus X, the temperature is more than or equal to 80 ℃ plus X, and secondary early warning is carried out;
mode 3: the synteny ratio is more than or equal to 1+Y times, the temperature rise is more than or equal to 50 ℃ plus X, the temperature is more than or equal to 100 ℃ plus X, and three-stage early warning is carried out;
wherein, the collinear ratio is the ratio of the temperature rise value of the regional contact net to the average value of the temperature rise values of different regions of the contact net, and is-1;
temperature rise = contact network temperature measured by thermal imager-ring temperature displayed by host;
temperature = temperature rise + ring temperature displayed by the host;
the value range of Y is [1,5], and the value range of X is [ -10,10];
the working mode during low-temperature early warning is as follows:
mode 1: the temperature is less than or equal to minus 5 ℃, and low-temperature primary early warning is carried out;
mode 2: the temperature is less than or equal to minus 10 ℃, and the low-temperature secondary early warning is carried out;
mode 3: the temperature is less than or equal to minus 15 ℃, and the low temperature is early-warning in three stages.
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| CN111928959A (en) * | 2020-07-21 | 2020-11-13 | 国电新能源技术研究院有限公司 | Method and device for measuring surface temperature distribution of heat exchange tube of tube panel heat exchanger |
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