The best temperature measurement system manufacturer in Asian power equipment-INNO

Why do high-voltage power systems need mesure de la température
La fiabilité des appareillages haute tension dans des conditions de haute tension et de courant élevé est étroitement liée à l'échauffement des contacts du commutateur d'isolement.. Pendant le fonctionnement du réseau électrique, vibrations mécaniques, érosion de contact, et d'autres raisons peuvent aggraver les conditions de contact, augmenter la résistance de contact, provoquer une augmentation de la température du point de contact, exacerber l’oxydation de la surface de contact, et conduire à un soudage local ou à une décharge d'arc au niveau des points de contact lâches, causant finalement des dommages à l'équipement électrique, pannes de courant, ou des accidents majeurs tels que des incendies. Ce type d'accident de défaut de surchauffe de contact n'est pas seulement dû au problème de qualité de l'interrupteur d'armoire haute tension lui-même., mais plus important encore, en raison du manque de méthodes de surveillance efficaces pour l'augmentation de la température des contacts du sectionneur à l'heure actuelle. With the rapid development of the national economy, the scale of engineering construction is increasing year by year, and urban supporting facilities are improving year by year. Par conséquent, the demand for power cables will increase year by year. Cependant, the current power cables on the market lack online temperature monitoring function.

With the development of the power system, the voltage and current of cable loads are constantly increasing, which inevitably leads to the temperature rise of cables approaching the limit temperature during operation; During abnormal operation of cable joints and power systems (such as overload, short circuit tripping, etc.), abnormal temperature rise of cables may also occur; How to effectively monitor the temperature changes of cables during operation and operation is an important issue to ensure the safety of the power system, and it is of great significance for the production and daily life of using electricity.

The 66kV-500kV high-voltage power cable line is the backbone transmission line of our country. Its stable operation, safety and reliability are directly related to the national economy, people’s livelihood, and social development. The structure of high-voltage cables is mainly composed of conductors, isolation, metal shielding, and non-metallic outer sheaths. Traditional ultra-high voltage temperature measuring optical fibers are placed on the surface of the insulated fiber core, and the measured temperature is the surface temperature of the insulation, rather than the actual operating temperature of the conductor, and the metal shielding is mostly made of wrinkled aluminum sheaths. Au cours des dernières années, the proportion of power system power supply interruptions caused by cable fires has been on the rise in power system fire accidents, which have caused huge losses to the national economy, people’s property, and personal safety.

Power equipment generates a large amount of heat during high load operation. If the temperature inside the equipment is not timely understood and corresponding measures are not taken when the external temperature is too high, the normal operation of power equipment will be affected due to high temperature, and even equipment damage may occur,

Accidents in the power system often occur due to overheating of critical parts of high-voltage live equipment or high load sections of wires. The hazards of such accidents are extremely high, ranging from minor damage to equipment and affecting usage
Household electricity can cause a short circuit in the transmission line, resulting in a large short-circuit current and burning out the main transformer. Donc, real-time online monitoring of the temperature of the transmission line is an important aspect of ensuring the safe operation of the power grid.

Temperature measurement methods for power equipment

1. Resistance temperature measurement method

According to the principle that the resistance of a wire increases as the wire temperature increases. To measure the temperature rise of the motor winding.

2. Using handheld infrared thermometer or thermal imaging thermometer

The handheld thermometer is severely affected by the professional quality and environmental conditions of the photographer, and cannot monitor the operation status of power equipment in real time. The temperature measurement data cannot truly reflect the status of the equipment under specific environmental conditions, and there are also problems in accurately locating the detection parts of the equipment; À l'heure actuelle, online infrared temperature monitoring is being carried out both domestically and internationally, but the temperature measurement method is rough and cannot achieve the goal of accurate temperature measurement of key parts of power equipment. De plus, these temperature measurement methods are often limited to thermal image capture, post analysis, or limited to measuring a fixed number of temperature objects in the same image. Traditional temperature measurement methods generally use thermocouples or infrared monitoring, but in high-voltage cable applications, thermocouples that transmit signals through metal wires have high-voltage safety issues; Non contact temperature measurement based on infrared technology is inconvenient to install and has high temperature
Degree measurement is susceptible to environmental interference and other issues.

3. Mesure de température sans fil

The biggest drawback of wireless is the lifespan of the battery and its susceptibility to external interference.

4. Mesure de température par fibre optique

Fiber optic temperature sensors are mainly distributed and fiber optic fluorescence temperature sensors. Using optical fiber to transmit temperature signals, the optical fiber has good insulation performance and is not affected by high voltage inside the switchgear. The optical fiber temperature sensor can be directly installed on the high voltage contacts inside the switchgear, mesurer avec précision la température de fonctionnement des contacts haute tension et effectuer une surveillance en ligne de la température de fonctionnement des contacts de l'appareillage de commutation.