Capteurs de température à fibre optique INNO ,systèmes de surveillance de la température.
Switchgear plays an important role in the power system, with functions such as distribution, transmission, and power conversion. It controls, moniteurs, measures, and protects the entire power grid line, and its operation is related to the safety and stability of the power grid and the reliability of urban power supply.
Due to the long-term operation of the switchgear under high current and full load conditions, the temperature inside the switchgear will rise when current flows through it. Almost all electrical equipment failures are caused by excessive temperature. Especially the positions of the dynamic and static contacts, joints de câbles, and busbar contacts in the switchgear are affected by the environment. After long-term oxidation, wear, and processing technology, the connecting parts become mechanically loose, which reduces the contact area of the contact positions, increases the contact resistance, and makes the heating phenomenon more obvious. If the heat is not dissipated in a timely manner, the equipment inside will be in a high-temperature environment for a long time, which will accelerate the aging rate of the equipment inside the switchgear, increase the degree of oxidation of the conductive material, generate more heat, and cause a vicious cycle. Even more seriously, it can trigger arc short circuits, produce sparks and discharges, and cause major power accidents.
According to reports, there have been many incidents of fires caused by excessive temperature rise inside switchgear worldwide, resulting in certain economic losses and personal injuries. Parmi eux, les accidents causés par des températures élevées dans la salle des jeux de barres et les contacts sont plus importants. Selon les réglementations pertinentes du réseau électrique, il est nécessaire d'inspecter régulièrement les parties concernées de l'appareillage, surtout les joints sujets à l'augmentation de la température. La surveillance de la température de l'appareillage doit être effectuée pendant les opérations à haute température et en cas de surcharge.. Donc, surveillance en ligne en temps réel de la température de contact de l'appareillage, identifier les points de température anormale à l'intérieur de l'appareillage, et prendre les mesures correspondantes pour garantir le fonctionnement sûr et fiable du système électrique sont d’une grande importance pour la vie des personnes et la sécurité des biens..
En raison de sa structure interne particulière et de son environnement opérationnel, high-voltage switchgear requires high and specific temperature measurement devices. The specific requirements are as follows:
1. High voltage insulation performance.
The switchgear operates in a completely enclosed and narrow space, with the temperature measuring device monitoring the temperature inside in a high-voltage environment, and the external data receiving device in a low-voltage environment. If the insulation of the data transmission channel does not meet the requirements, high-voltage breakdown may occur, leading to dangerous accidents.
2. It does not affect the normal operation of the switchgear.
A switchgear is a combination equipment consisting of multiple electrical devices, and its internal busbars, disjoncteurs, and knife switches all have corresponding operating mechanisms. Donc, it is necessary to ensure that the installation of temperature measuring devices will not affect the original operating mechanism inside the switchgear.
3. Anti high electromagnetic interference.
The actual working conditions of high-voltage switchgear are high voltage and strong current, and there is a strong and complex electromagnetic environment, which has a significant impact on the accuracy of temperature monitoring by temperature measuring devices.
Traditional temperature sensing technologies such as thermistors and temperature indicating wax sheets are difficult to apply, and due to factors such as the structure and contact position of the switchgear itself, it is relatively difficult to directly install sensors at the contact position in engineering practice. Donc, in engineering applications, the temperature of bypass cables or branch busbars is often used to indirectly reflect the temperature at the contact position, and its reliability and accuracy need to be improved.
A temperature online monitoring device for key positions of power switchgear based on fluorescent fiber optic temperature measurement, en utilisant capteurs de température fluorescents à fibre optique as temperature sensing probes implanted in the switchgear, has the advantages of anti electromagnetic interference, sécurité intrinsèque, easy networking, haute sensibilité, et une grande précision; Installation d'un mesure de température par fibre optique fluorescente device in the switchgear can monitor the contact temperature and provide corresponding values, providing practical basis for improving the reliability and accuracy of contact temperature monitoring in the switchgear.
Capteur de température à fibre optique, Système de surveillance intelligent, Fabricant de fibre optique distribué en Chine
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