Infrared thermal image temperature measurement technology is a very effective new equipment fault detection and temperature online measurement technology, which can accurately judge the operation of electrical equipment in the power system, improve the operation level of equipment management, and preventive maintenance and detection of transmission lines. In terms of, it has great advantages.
1 Overview
With the rapid development of the power industry in the direction of large units, large capacity and high voltage power supply, ensuring the safe operation of the power supply system and ensuring that the power equipment is always in a stable and good state have become a prominent problem in power management. Because the thermal effect of power equipment is an important cause of various faults and abnormal phenomena, real-time online temperature monitoring of the temperature of power equipment is an essential means to ensure the reliable operation of power equipment. With the rapid development of the power supply network and the increasingly rationalized grid structure, the country's requirements for power system reliability are becoming higher and higher. Therefore, the application of on-line temperature measurement technology of infrared thermal image of transmission line in power system is particularly important.
2. Infrared thermal image temperature measurement technology
Infrared thermal image temperature measurement technology is a technology that uses infrared to detect the thermal information of the infrared radiation state that is radiated on the surface of various electrical equipment in the transmission line, which is not seen by human eyes, and then converts it into temperature for display. It is a passive, non-contact detection method. It can measure the average temperature of a certain area around a certain point on the surface of the equipment, and judge the normality of its working state according to the temperature. Infrared thermal imager is a detection device made by this technology, which has been widely used in the field of online temperature measurement of transmission lines and fault diagnosis of power equipment.
The infrared radiation of the equipment is transmitted to the infrared thermal imager through the atmosphere. The optical system in the thermal imager converges the energy radiated by the equipment to the detector. The detector converts the incident radiation into electrical signals, which are displayed after signal processing.
The functions and advantages of infrared thermal imager: (1) By measuring the temperature distribution of the surface of the device, the location and nature of the heat loss inside the device can be analyzed to judge the health status of the device. The hot spot temperature is visually displayed, the heat is clear, and can be stored and printed. (2) It has the dual functions of qualitative imaging and quantitative measurement, and has higher spatial resolution and temperature resolution, which can distinguish small temperature differences. The real-time heat can be clearly displayed on the screen, which provides conditions for the establishment of a heat database, and realizes the functions of collection, storage, and analysis. (3) Infrared thermal imager inspection equipment belongs to long-distance non-contact scanning inspection, which can ensure the safety of personal equipment. (4) Infrared thermal imager detection equipment, like recording with a camera, can quickly detect large-area equipment, can accurately and intuitively find equipment defects related to operating voltage and current, and can also detect the nature and location of defects , Degree to make qualitative and quantitative judgments.
3. Application of infrared thermography temperature measurement technology
The temperature information of the transmission line can be effectively reflected by infrared images. Infrared thermal imaging is the only diagnostic technique that can visualize and verify thermal information instantly. Infrared thermal imaging cameras can reveal thermal faults and perform qualitative analysis through non-contact temperature measurement. With the help of professional infrared analysis software, the analysis report can be automatically completed within seconds.
3.1 Application of infrared thermal image temperature measurement technology in equipment detection
All equipment that uses or emits energy will generate heat before failure. In the past, inspectors of power system equipment generally used visual inspection, ear listening, and sniffing to understand the operation of the equipment. Among them, visual inspection is the main method, but the visual inspection method has great limitations. Defects, especially internal equipment defects, can only be discovered after the equipment heats up to a certain level. This not only causes delays in the timely detection and handling of equipment defects, but also may cause varying degrees of damage to the operating equipment. Infrared thermal imaging technology can quickly, accurately and safely detect failures before equipment failures, and perform timely maintenance to avoid losses caused by power failure and power failure caused by high-temperature thermal failures on transmission lines.
The thermal imaging camera can correctly guide preventive maintenance experts to accurately judge the operation of electrical equipment. You can compare the measured temperature value with the historical temperature, or with the temperature readings of similar equipment at the same time, to accurately determine whether a significant temperature rise has occurred, whether it will cause component failure, and bring hidden production risks. Mainly used for power preventive maintenance and other purposes. Especially for the preventive maintenance and detection of transmission lines, it has great advantages
The characteristics of the infrared thermal imager: (1) The operation is simple, and the equipment temperature inspection is intuitive and convenient. Using the menu operation mode, the man-machine interface is friendly and the operation is simple; it can also transmit the image information to the computer through the communication port, and use the computer to perform background processing on the temperature image. (2) Detecting the temperature of the equipment in a scanning manner, replacing the point-by-point measurement mode, greatly improving work efficiency. The infrared thermal imager can measure the temperature of all the devices in the scanning range at the same time, and can be set to alarm the temperature exceeding the allowable temperature in the scanning range, and use this machine to inspect the substation. You can complete the preliminary temperature measurement of all equipment. (3) Temperature measurement by means of scanning makes it possible to turn the key measurement of the temperature of power equipment into a comprehensive measurement. Not only can the connector parts of the equipment be fully measured, but the equipment itself such as transformers, circuit breakers, porcelain bottles, etc. can be measured. (4) As the efficiency of temperature measurement is improved, the frequency of equipment temperature measurement is increased, and the temperature status of the equipment is more timely. The device temperature is measured at the same time as the patrol device is achieved, so that the device temperature measurement frequency and the device patrol video rate are synchronized, and the timeliness of the device temperature situation is greatly improved. (5) Through the temperature image, the equipment failure analysis becomes possible. The measured temperature image of the equipment, because of its rich temperature information, can observe the temperature distribution of each point of the equipment. Through the temperature distribution information, the internal faults of the equipment can be detected, and the equipment failure analysis can be realized.
3.2 Application of infrared thermal image temperature measurement technology in online temperature monitoring
The transmission line infrared thermal image online temperature measurement system uses advanced infrared thermal imaging technology to conduct online monitoring of the transmission line operating temperature; the existing GPRS wireless communication network is used to transmit the thermal image data, which has a wide coverage and does not require additional transmission The characteristics of equipment and lines are especially suitable for transmission lines in remote areas where lines cannot be erected. The system image acquisition and transmission terminal is composed of infrared thermal image acquisition module, image data compression module, GPRS network communication module, image data transmission module and solar power supply device. The image data compression module adopts JPEG hardware compression coding technology for static images Compression coding minimizes the amount of data transmitted over the network, saves network resources, and improves the speed of image transmission. In order to solve the problem of variable rate sampling caused by the relatively high speed image acquisition, compression control and relatively slow data transmission speed in the design, the system hardware structure adopts the program of microcontroller plus programmable logic control chip (MCU + CPLD). The sub-functions are completed by standard general-purpose modules, which reduces the system complexity and improves the overall performance of the system. Users can use PCs to realize remote collection and on-site monitoring of the thermal image through the Internet.
3.2.1 Structure of online temperature monitoring system
The whole monitoring system is mainly divided into two parts: image acquisition and transmission terminal (front end); monitoring center computer data server (center end). In terms of system configuration, it can be divided into two parts: upper computer (computer data server of monitoring center) and lower computer (image acquisition and transmission terminal). The computer data server is responsible for the management and control of the image acquisition and transmission terminal, which is at the upper level of the management level, so it is called the upper computer. The image acquisition and transmission terminal is under the control of the data center and is responsible for the collection and transmission of data. It is at the lower level of the management level, so it is called the lower computer.
The image acquisition and transmission terminal includes an image acquisition and JPEG compression part with an image acquisition chip processor as the core, a GPRS network transmission part, and an infrared alarm part. In the image acquisition part, the digital conversion of the analog image is realized by the video A / D chip, and the special chip is used to realize the JPEG image compression coding. The GPRS wireless network transmission part is realized by the special GPRS module, and its interface with the image acquisition part is a universal asynchronous serial interface (UART). The infrared alarm part realizes the alarm function of abnormal condition of the transmission line temperature. The lower computer mainly realizes the collection and compression of the original image on the transmission line and the GPRS wireless channel transmission of the compressed image data. These functions are realized by the corresponding software support system.
The server includes hardware and software. The hardware is a computer with a public IP address. The software is a server program. The server program implements command transmission and data transmission between the GPRS network transmission module and the center. The computer data server of the monitoring center also includes hardware and software. The hardware is a computer that can access the Internet, the software is a monitoring program, and the network status of the computer is a public network and dynamic IP. It is particularly pointed out here that because the monitoring center end meets the network requirements of the server, the system puts the server and the monitoring center end on one computer to save hardware and network resources. The host computer mainly realizes the reception and decoding of compressed image data and the database storage and processing of the received image data.
3.2.2 Features of online temperature monitoring system
(1) Non-contact temperature measurement. The temperature measurement signal can be continuous or intermittent. It has a local temperature display function. At the same time, the measurement signal can be converted into a standard electrical signal for remote transmission.
(2) The temperature response time is faster than the contact temperature measurement, the temperature measurement data is accurate, the accuracy level is high, stable and reliable.
(3) The temperature measurement system is flexible, simple, fast, convenient, safe and reliable, and the system is maintenance-free.
(4) The temperature measurement system has strong anti-interference ability, and can still work normally in environments with large noise, large electromagnetic interference, large vibration and large dust.
(5) The wireless transmission performance is stable, which can overcome the harsh environment on the spot and transmit the temperature measurement signal to the control room in real time and accurately.
(6) The temperature measurement computer system displays the temperature measurement signal in real time, which can be read and stored in various forms at any time. In addition, the temperature measurement signal can be uploaded to the ERP management network.
(7) This system implements a remote automatic detection control system. The system will automatically save the record of each temperature inspection, and video recording at the same time. Once the system detects abnormal temperature (that is, setting beyond the high and low temperature range), it will prompt the monitoring staff to have an abnormality through the flashing of the monitoring screen and the alarm sound. Display, alarm, preset, record query, etc. are all realized in the monitoring center. In this way, the timeliness of the measurement is ensured, and the consumption of manpower and material resources is reduced.
4 Conclusion
Infrared thermal imaging technology is a very effective new equipment fault detection and temperature online measurement technology, which can correctly guide preventive maintenance experts to accurately judge the operation of electrical equipment, improve the equipment operation management level, and ensure the safety and quality of power supply In order to better realize the unattended substation, it is of great significance to promote the application of non-contact infrared thermal imaging cameras in power systems.
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