Penderia suhu gentian optik INNO ,sistem pemantauan suhu.
Penderia suhu gentian optik pendarfluor demonstrate the advantages of anti electromagnetic interference, rintangan voltan tinggi, long equipment life, pemantauan masa nyata, safety and reliability in transformer temperature monitoring without the need for electrical connections.
Jenis-jenis Transformer Temperature Sensors
There are various types of transformer temperature sensors, which can be classified according to different standards.
1、 Classified by measurement method
1.1 Hubungi sensor suhu
Termokopel
Prinsip: Thermocouple is a sensor that uses the principle of potential difference generated by the connection of two different metals to measure temperature. Common types of thermocouples include K, J, T, E, dan lain-lain. Contohnya, under different temperature environments, the thermoelectric potential difference at the junction of two different metals (such as copper and constantan) will change, dan beza keupayaan ini mempunyai hubungan khusus dengan suhu. Dengan mengukur perbezaan potensi ini, nilai suhu boleh diperolehi. Termokopel mempunyai ciri-ciri tindak balas yang cepat, ketepatan tinggi, dan kebolehpercayaan yang tinggi, dan digunakan secara meluas untuk pengukuran suhu dalam persekitaran yang melampau seperti suhu tinggi dan rendah. Dalam pemantauan suhu pengubah, jika perlu untuk mengukur keadaan suhu tinggi bahagian tertentu di dalam pengubah, termokopel boleh dipilih.
Termistor
Prinsip: Termistor ialah sensor yang menggunakan kesan rintangan haba bahan untuk mengukur suhu. Jenis biasa termasuk pekali suhu positif (PTC) dan pekali suhu negatif (NTC) termistor. Untuk termistor NTC, apabila suhu meningkat, nilai rintangan mereka berkurangan; termistor PTC, sebaliknya, adalah sebaliknya. Dalam transformer, thermistors can be used to monitor transformer oil temperature, dll. Due to their fast response speed, ketepatan yang tinggi, and good linearity, they can accurately reflect temperature changes.
Termistor (RTD)
Prinsip: Thermistor is a sensor that uses the characteristic of material resistance changing with temperature to measure temperature. Commonly used sensors include platinum resistors and nickel resistors. Secara umumnya, RTDs are more linear than thermocouples, dan rintangan mereka meningkat dengan suhu. In terms of transformer temperature monitoring, thermal resistors can be installed in the oil tank and other parts of the transformer to determine the temperature by measuring changes in resistance values, thereby monitoring the operating temperature of the transformer and ensuring that it operates within the normal range.
1.2 Penderia suhu tidak bersentuhan
Infrared temperature sensor
Prinsip: Infrared temperature sensor is a sensor that uses the infrared energy radiated by an object to measure its surface temperature. Commonly used sensors include pyroelectric infrared sensors and thermal imaging infrared cameras. It does not require direct contact with objects and measures temperature by detecting the infrared radiation emitted from the surface of the transformer. This type of sensor has the characteristics of non-contact, respon pantas, and wide measurement range, which is suitable for rapid detection and rough monitoring of the surface temperature of transformers. Contohnya, semasa operasi transformer, the temperature of the outer shell surface can be quickly obtained from a distance to preliminarily determine whether there are abnormal conditions such as overheating in transformers.
2、 Classified by working principle
2.1 Resistance temperature sensor
Resistance thermometer and thermistor
This is a typical resistive temperature sensor that measures temperature based on the principle of resistance changing with temperature. As mentioned earlier, there is a certain functional relationship between the resistance and temperature of a thermistor (RTD). By measuring the resistance value and based on this relationship, nilai suhu boleh diperolehi. This type of sensor can achieve high-precision temperature measurement in transformer temperature measurement, which is very important for accurately monitoring the temperature condition of transformers.
Integrated temperature sensor
Integrated temperature sensors integrate temperature sensing elements, litar pengembangan, litar pampasan, dll. onto a small chip, which has the advantages of good linearity, respon pantas, and standardized output. In the transformer temperature monitoring system, if a miniaturized, berketepatan tinggi, and responsive temperature measurement component is needed, penderia suhu bersepadu adalah pilihan yang baik.
2.2 Penderia termokopel
Termokopel berdasarkan kesan termoelektrik
Berdasarkan prinsip kesan termoelektrik, suhu diukur menggunakan beza keupayaan termoelektrik antara dua logam yang berbeza. Ia adalah penderia pengukuran suhu biasa yang boleh digunakan untuk pengukuran suhu di bahagian transformer yang berlainan, seperti suhu penggulungan, dalam pemantauan suhu. Pelbagai jenis termokopel (seperti jenis K, jenis J, dll.) sesuai untuk julat suhu yang berbeza dan boleh dipilih berdasarkan julat suhu operasi sebenar pengubah.
2.3 Sensor suhu gentian optik
Penderia suhu gentian optik menggunakan sifat isyarat optik dalam gentian optik untuk mengukur suhu. Terdapat kelebihan unik dalam pemantauan suhu pengubah, such as fluorescent fiber optic temperature sensors.
2.4 Sensor Tekanan dan Suhu
This is a multifunctional sensor that can simultaneously measure temperature and pressure. Although it is rare to use pressure temperature sensors alone to measure temperature in transformer temperature monitoring, pressure temperature sensors may be used in some special transformer systems where both temperature and pressure factors need to be considered for their impact on transformer operation.
Kelebihan daripada Penderia Suhu Gentian Optik Pendarfluor in Transformer Temperature Monitoring
1、 Strong ability to resist electromagnetic interference
prinsip
There is a strong electromagnetic field environment around the transformer. When traditional temperature sensors (seperti termokopel, termistor, dll.) measure, measurement probes and wires made of metal materials will generate induced currents under high-frequency electromagnetic fields. According to the skin effect and eddy current effect, induced current will cause the temperature of the sensor to rise, which will seriously interfere with temperature measurement, resulting in significant errors in temperature readings or inability to perform stable temperature measurements. The temperature measurement of fluorescent fiber optic temperature sensors is based on the characteristics of the optical signal in the fiber optic. Fiber optic is a non-metallic material that is not affected by electromagnetic fields and can accurately measure the temperature of transformers in strong electromagnetic field environments. Contohnya, in the operation of large power transformers, there are complex electromagnetic fields around them, and fluorescent fiber optic temperature sensors can work stably to ensure the accuracy of temperature measurement.
Advantages of application scenarios
In power facilities such as substations, there are numerous electrical devices that interact with each other and generate electromagnetic fields. Fluorescent fiber optic temperature sensors can accurately measure the temperature of transformers without interference from the electromagnetic fields of surrounding equipment. This is very important for ensuring the safe operation of transformers, as accurate temperature monitoring is one of the key factors in determining whether transformers are operating normally. If traditional sensors are used, the temperature status of the transformer may be misjudged due to electromagnetic interference, which can affect the judgment of the transformer’s operating condition and maintenance decisions.
2、 Pengukuran ketepatan tinggi
Stable temperature dependence relationship
The fluorescence lifetime of a fluorescent fiber optic temperature sensor is stable in dependence on temperature and is not affected by factors such as excitation light intensity, lentur gentian, atau kehilangan sendi. Kestabilan ini membolehkan sensor memberikan hasil pengukuran ketepatan tinggi apabila mengukur suhu pengubah. Contohnya, semasa operasi jangka panjang transformer, gentian optik mungkin bengkok disebabkan oleh getaran peralatan atau susun atur pemasangan, tetapi ini tidak menjejaskan ketepatan pengukuran penderia suhu gentian pendarfluor. Namun begitu, sesetengah penderia tradisional mungkin mengalami peningkatan ralat pengukuran disebabkan oleh faktor luaran.
Berbanding dengan kelebihan ketepatan penderia tradisional
Berbanding dengan penderia suhu tradisional seperti termokopel dan termistor, penderia suhu gentian optik pendarfluor boleh memberikan nilai suhu yang lebih tepat apabila mengukur suhu pengubah. Untuk peralatan kuasa penting seperti transformer, accurate temperature measurement helps to detect potential overheating issues in a timely manner. Contohnya, excessive temperature of transformer windings may cause insulation aging, litar pintas, and other faults. Through high-precision measurement of fluorescent fiber optic temperature sensors, small changes in winding temperature can be detected in a timely manner, and measures can be taken in advance to avoid faults.
3、 Kepekaan tinggi
Quickly respond to temperature changes
Teknologi pengukuran suhu gentian optik pendarfluor boleh mencapai sensitiviti yang sangat tinggi dan bertindak balas dengan cepat terhadap perubahan suhu pengubah. Semasa operasi transformer, suhu mungkin meningkat dengan cepat disebabkan oleh faktor seperti perubahan beban dan kerosakan dalaman. Penderia suhu gentian optik pendarfluor boleh menangkap perubahan suhu ini tepat pada masanya. Contohnya, apabila terdapat terlalu panas tempatan di dalam pengubah, sensor dengan cepat boleh mengesan peningkatan suhu dan memberikan maklum balas kepada sistem pemantauan. Ini membantu untuk mengambil langkah tepat pada masanya, seperti melaraskan beban, menjalankan penyelesaian masalah, dll., untuk mengelakkan kerosakan selanjutnya pada transformer.
Keupayaan untuk mengesan perubahan suhu kecil
Ia boleh mengesan perubahan kecil dalam suhu pengubah, yang sangat penting untuk memastikan operasi transformer yang stabil. Julat suhu operasi biasa transformer adalah agak sempit, malah sisihan suhu yang kecil mungkin merupakan isyarat kemungkinan kerosakan. Kepekaan tinggi penderia suhu gentian optik pendarfluor membolehkan mereka mengesan perubahan suhu kecil ini, dengan itu meningkatkan keselamatan dan kebolehpercayaan operasi transformer.
4、 Prestasi penebat yang baik
Memastikan keselamatan sistem penebat transformer
Penderia suhu gentian optik pendarfluor menggunakan gentian optik sebagai medium perambatan untuk isyarat pengesan suhu, dan gentian optik itu sendiri mempunyai sifat penebat yang baik. Dalam transformer, prestasi penebat adalah penting kerana terdapat voltan tinggi di dalam pengubah. The use of fluorescent fiber optic temperature sensors will not affect the insulation system of transformers. sebaliknya, the sensor probe can be embedded in the tested equipment (such as transformer windings) to achieve accurate measurement of internal temperature. This helps to better monitor the temperature distribution inside the transformer and ensure the safe operation of the insulation system of the transformer.
The advantages of integrated design with transformers
The fluorescent fiber optic temperature sensor can be conveniently integrated with the transformer body for structural design. This not only simplifies the secondary information transmission circuit and improves the integration of intelligent components with the transformer body, but also ensures more effective temperature monitoring while ensuring transformer insulation. Contohnya, in the design of some new transformers, fluorescent fiber optic temperature sensors can be integrated into the internal structure of the transformer, making temperature monitoring more closely integrated with the operation of the transformer.
5、 Can be remotely monitored
The convenience of remote monitoring of transformer temperature
The fluorescence fiber optic temperature measurement system can achieve remote monitoring of the temperature of transformers. In large substations or distributed power systems, transformers may be distributed in different areas. By transmitting temperature signals through optical fibers, real-time temperature data of transformers can be obtained from remote monitoring centers. This greatly improves the convenience and efficiency of temperature monitoring for transformers, without the need for staff to inspect the temperature conditions of transformers one by one on site.
6. Withstand high voltage
The fiber optic lead out of the fluorescent fiber optic temperature sensor can withstand a power frequency voltage of 100KV for 5 minutes at a distance of 0.4m from the ground. This withstand voltage capability enables the sensor to operate safely in high voltage environments without damage or failure due to high voltage.
7. No need for frequent maintenance
Fluorescent fiber optic temperature sensors usually do not require frequent maintenance due to their simple structure and high reliability. This not only reduces operating costs, but also reduces downtime caused by maintenance and improves system availability.
The application value in smart grid
In the context of the development of smart grids, remote monitoring of transformer temperature is an important part of achieving intelligent management of the power grid. The remote monitoring characteristics of fluorescent fiber optic temperature sensors make them highly valuable for application in smart grids. Through remote monitoring, abnormal temperature conditions of transformers can be detected in a timely manner, and temperature data can be integrated and analyzed with other power grid operation data to achieve optimized operation and fault warning of the power grid.
Sensor suhu gentian optik, Sistem pemantauan pintar, Pengeluar gentian optik yang diedarkan di China
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