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The world’s best manufacturer of fiber optic thermometers for ring main cabinet cable joints

Why do cable elbow joints in ring main unit need temperature measurement

At present, the cable joints inside the 10KV ring main cabinet are sealed by the cabinet body, and under normal operation, it is impossible to inspect the temperature changes of the internal cable elbow. The cable joints in the ring main cabinet heat up due to aging or excessive contact resistance, and the temperature of the heating part cannot be monitored in real time, which can easily lead to equipment burning or sudden power outage accidents. The temperature of the elbow head of the ring main unit is an important indicator for measuring the safe operation of the ring main unit. Excessive temperature of the elbow head of the ring main unit can easily lead to explosion accidents, affecting the safe and stable operation of the system. Therefore, it is necessary to strictly control the temperature of the elbow head of the ring main unit.

The temperature of the elbow head of the ring main unit is an important indicator for measuring the safe operation of the ring main unit. Excessive temperature of the elbow head of the ring main unit can easily lead to explosion accidents, affecting the safe and stable operation of the system. Therefore, it is necessary to strictly control the temperature of the elbow head of the ring main unit.

Temperature measurement method for cable elbow head of ring main cabinet

The traditional manual measurement method is used to measure the temperature of the elbow head of the ring main unit. However, this measurement method is labor-intensive and cannot achieve real-time online temperature monitoring. During the process of temperature rise, it cannot guarantee timely transmission of real-time temperature to the operation monitoring personnel for monitoring and early warning operations. Some manufacturers also choose infrared temperature measurement methods, but most ring main cabinets find it difficult to configure an infrared measurement window. Even if equipped with an infrared detection window, due to the limitation of window size, it is difficult to ensure that the elbow head can be measured in all directions during the testing process. Therefore, during the operation of the ring main cabinet, real-time temperature measurement cannot be carried out through the infrared measurement window or unboxing. There are a large number and wide distribution of ring main cabinets, with exposed high voltage inside. The internal space is narrow and cannot be manually inspected and monitored. Conventional temperature monitoring methods cannot be used. The elbow shaped head inside the cabinet seals the cable joints, causing delayed temperature conduction and making it difficult to detect problems. Therefore, it is necessary to study the surface temperature changes of the elbow head inside the ring main unit, analyze the laws of surface temperature and internal cable joint temperature changes, judge the trend of cable joint temperature changes through technical means, and achieve online monitoring and diagnosis functions.

In order to solve the existing traditional temperature measurement methods, FJINNO provides a fiber optic temperature measurement system for cable elbow insulation plugs in ring main unit cabinets. Based on the temperature changes inside the elbow head of the ring main unit, analyze the changes in internal temperature and cable joint temperature, determine the trend of cable joint temperature changes, and achieve online monitoring and diagnosis functions. By directly contacting the elbow head with fluorescent temperature measuring elements embedded in the insulation plug, monitor the operation of internal components and cable joints, which can effectively prevent accidents caused by heating of the cable elbow head inside the ring main unit.

What is a fluorescence fiber optic thermometer?

Fluorescent fiber optic thermometer is a new type of temperature measurement instrument that uses the time characteristic changes of the fluorescence afterglow of the fiber optic temperature sensing probe to measure temperature. Due to the obvious advantages of the fiber optic sensor, it has the characteristics of no power to the probe, no current, no contact between the metal conductor and the measured object, and can achieve complete electrical isolation.

Why choose a fiber optic thermometer?

In many temperature measurement industries, if manufacturers and customers are also affected by interference signals using traditional temperature measurement methods by community owners, or if the temperature measurement area does not allow all metal materials and electrical conductors to touch, or if there are very good dielectric strength regulations under high working voltage, or if you have relatively high safety factors for temperature measurement methods, then FJINNO’s fiber optic thermometer should be selected and applied.
Compared with traditional temperature measurement methods such as thermal resistance and platinum thermal resistance, fiber optic thermometers have many advantages:
1. The fiber optic probe has no current passing through, and in all conditions (including damage or rupture caused by safety accidents or disasters), the temperature measurement position is not prone to electrical leakage, short circuit faults, spark discharge, etc., with a relatively high safety factor. The fiber optic probe essentially refers to a fire safety and explosion-proof type, which is the most ideal way to measure temperature of flammable and explosive materials such as crude oil and gas. Accurate measurement does not require additional explosion-proof protection measures, making installation and use convenient.
2. The optical signals transmitted through optical fibers are not affected by strong magnetic fields or high-voltage electricity, and have strong anti-interference ability. And the optical fiber itself is made of insulated quartz fiber raw materials, with a dielectric strength far exceeding that of platinum thermistors. Therefore, it is suitable for temperature measurement of high-voltage charged bodies such as diesel engine generators, transformers, and transformer cabinets.
3. It will not be affected by factors such as microwave heating and frequency radiation. The fiber optic probe can be placed in a microwave oven for heating, immediately and accurately measuring the temperature of the object throughout the microwave heating process.
Compared with infrared temperature measurement methods, fiber optic thermometers have the following advantages:
1. Infrared temperature measurement can only accurately measure the ambient temperature of the object, and cannot accurately measure the internal temperature of enclosed machine equipment (such as the internal magnetic coil of the transformer), while fiber optic thermometer can extend the probe into the machine equipment for precise measurement.
2. Infrared temperature measurement is a non precise measurement, which is affected by the reflection surface and light of the surface of the object. When accurately measuring a surface smooth object, there is a large deviation (such as metal materials, porcelain, laminated glass). If a fiber optic thermometer is selected with a fiber optic sensor for precise measurement, it will not be affected by this reason and the temperature measurement will be accurate and reliable.

Suitable range of fiber optic thermometer:
Electric power enterprises, transformers, generator sets, high-voltage switchgear and other high-voltage live body temperature measurement
Risk areas such as crude oil, gas, and coal mines (do not require explosion-proof protection);
Temperature measurement throughout the production, manufacturing, and transportation of flammable and explosive materials, fireworks, and firecrackers;
Microwave heating and frequency radiation heating processing technology;
Storage and transportation of hazardous chemicals, chemical engineering.

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