Which type of fiber optic temperature sensor is used for hotspots in ring main units

Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China

The temperature measurement distance of the fluorescent fiber optic temperature measurement system generally ranges from 0 meters to 20 meters, and different requirements are specified according to specific application scenarios. The occasions for temperature measurement include switch cabinets, ring main units, transformers, etc.

The use of fluorescence for temperature measurement is a new type of temperature measurement technology developed in recent years. By combining fluorescence analysis technology with fiber optic sensing technology, it can be more flexibly applied to more occasions. The use of fluorescence for temperature measurement technology started earlier in developed countries abroad. Since the 1970s and 1980s, fluorescent fiber optic temperature sensors have been widely applied and researched in various fields. In recent years, some manufacturers have developed temperature measurement products based on the principle of fluorescence, which are widely used in industries such as power and medical. Due to the excellent insulation, inherent safety, and immunity to electromagnetic interference of optical fibers, they have received widespread praise in some harsh electromagnetic environments.

Advantages of Fluorescent Fiber Optic Temperature Measurement

The biggest advantage of fluorescent fiber optic temperature measurement is that the fiber optic is an insulating material, which is not affected by the surrounding electromagnetic field interference, especially for high voltage and strong electric field environments, the advantages are even more obvious. In addition, the temperature value of fluorescence fiber optic temperature measurement only depends on the time constant characteristics of the fluorescent material, and is independent of other variables in the system. It has the advantages of high interchangeability, good stability, no need for calibration, and long lifespan.

In industrial applications, traditional temperature measurement methods often use thermocouples, thermal resistors, and other methods for temperature measurement. These temperature measurement methods based on electrical signals may sometimes have significant errors in temperature data due to electromagnetic interference in strong magnetic environments. However, fiber optic temperature sensing technology based on optical signal transmission can solve this problem.

Fluorescence fiber optic temperature measurement technology is a measurement technique that uses light source signals as excitation to demodulate fluorescence lifetime signals and obtain temperature information. It has the characteristics of accurate temperature measurement, high resolution, fast dynamic response, and strong resistance to electromagnetic interference. It is particularly suitable for temperature measurement in harsh environments with strong electromagnetic fields, high temperature, corrosion, high pressure, and explosion hazards.

Ring main unit is an important equipment in the distribution network, and its operating status directly affects power supply safety; The crimping process, materials, and connections of cables inside the cabinet can cause partial discharge or abnormal contact resistance at high-voltage connection points, leading to heat generation. Abnormal temperature rise not only accelerates aging, but also easily causes faults and damage, affecting power supply safety. Therefore, it is necessary to regularly monitor the operating temperature of the ring main unit to ensure its normal and stable operation; At present, the existing cable joint temperature measurement methods mostly belong to external non-contact temperature measurement. The conventional operation method is to use a handheld infrared thermometer (infrared electronic thermometer) to measure the temperature outside the ring main unit. This temperature measurement method is easily affected by environmental factors and cannot accurately measure the internal temperature of high-voltage charged bodies. The temperature measurement error is large, and in order to minimize the error, it usually requires repeated temperature measurement operations and taking the average value for reference, resulting in low temperature measurement efficiency; At the same time, in a high-voltage live environment, there are certain safety hazards for operators to conduct temperature measurement operations at close range.

Function of fluorescence fiber optic temperature measurement system

1. The on-site temperature measurement device collects real-time temperature information of the switchgear contacts and cables. The use of Innolux fluorescent fiber temperature probes has extremely strong electromagnetic immunity, voltage resistance, and insulation performance. Sensitive temperature sensing, long-term stable and reliable operation. The temperature measurement accuracy can reach ± 1 ℃.
2. The system comes with sound and light alarms, dry contact outputs, and a human-machine interface to display alarm information.
3. The backend monitoring software system displays real-time temperature information of each contact of the current switchgear, real-time curves, and historical data storing temperature information of each contact over the past month. Using various diagnostic methods to analyze the health status of equipment, including analysis of all equipment parameter limit alarms and other judgment methods, to monitor the operation status of high-voltage switchgear in a timely manner.
4. The fiber optic temperature measurement system can automatically and manually generate various periodic reports, which can be exported and printed. The exported reports can be edited and viewed through Excel software. At the same time, the system has real-time and historical temperature curve display functions, and the curve can accurately reflect the real-time monitoring curve and the temperature change curve of the monitored object at a certain point in a certain period of time.