Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China
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Why does the temperature rise during the operation of high-voltage cables
The vast majority of high-voltage cable operation accidents are caused by partial discharge and high operating temperatures of cable joint conductors. Due to the effect of partial discharge, the electrical performance of the cable insulation medium will continue to age. In addition, cable joints are prone to heating due to contact resistance, leading to a decrease in cable insulation. Over time, high voltage can penetrate the insulation layer, causing explosion accidents at joints or terminals, resulting in large-scale power outages. In recent years, with the increasing scarcity of land resources and the vigorous development of power construction, the penetration rate of urban underground cables has also been rapidly increasing. The operating years of some cables have approached their design years. Whether from the perspective of safe operation of power cables themselves or from the perspective of power system dispatch and management, monitoring the temperature and partial discharge information of cable joints is of great significance.
FJINO is equipped with fiber optic temperature sensors and fluorescent temperature sensors connected to an online monitoring system. The built-in temperature measurement and partial discharge detection of high-voltage cable joints enable continuous monitoring of the operation status of power cables, providing decision-making data for dynamic current carrying capacity control, evaluating the remaining life of cables, and scientifically managing power cable lines. This is of great significance in maximizing the use of existing cables, improving the economic efficiency of engineering investment, reducing the risk of overload, ensuring the safe and reliable operation of the lines, and reducing the direct and indirect losses to consumers caused by sudden power outages due to power system accidents.
The operation of power equipment under high voltage and high current conditions is closely related to heat generation. Under normal circumstances, the heating effect will not affect the safe operation of the equipment. However, due to changes in certain factors and long-term operation, the heating effect can intensify, resulting in abnormal heating. In severe cases, it may cause changes in the mechanical properties of the material, leading to partial discharge, resulting in burning, welding, or damage to the connectors, or deterioration of the dielectric insulation performance. Causing breakdown phenomenon until the loss of insulation performance leads to accidents, directly or indirectly affecting the safety and operation of the entire system. Surface temperature measurement is a commonly used detection method in power systems. It determines whether the cable or cable accessories are overheated by measuring the surface temperature of the cable and its accessories. This method is relatively simple and can detect some obvious abnormal temperature distributions.
The fiber optic temperature measurement and partial discharge comprehensive monitoring device is an intelligent product for online monitoring. The product has powerful functions and integrates advanced fluorescence fiber optic temperature measurement function and real-time monitoring of partial discharge. Real time online monitoring of switchgear, ring main unit, transformers, cables, etc., with RS485 and fiber optic communication interfaces, MODBUS, IEC61850 and other communication protocols, to further intelligentize, digitize and network power products, suitable for all needs of intelligent substations.
Characteristics of Fiber Optic Temperature Measurement+Partial Discharge Online Monitoring System
1. Suitable for online monitoring of power industry switchgear, ring main unit, cables, transformers, etc;
2. Anti interference design, especially suitable for harsh environments, suitable for long-term stable operation in various environments;
3. The system of the intelligent monitoring device is entirely independently developed and produced, ensuring high stability and reliability of the device;
4. Fluorescent fiber optic temperature measurement has the characteristics of high temperature resistance, anti creepage, anti fouling flashover, wide temperature measurement range, high accuracy, and fast temperature measurement speed. Fluorescent probes can be safely used in any environment; Fluorescent fiber optic sensors have the characteristics of small size, good flexibility, bending resistance, and long lifespan (up to 30 years or more);
5. The real-time monitoring of partial discharge adopts advanced partial discharge monitoring technology with sensors, which can monitor partial discharge in switchgear circuit breakers and busbar rooms, as well as partial discharge in cables. It has high anti-interference ability, accurate monitoring data, easy and fast installation, and other characteristics;
6. The product itself will not reduce the overall insulation and voltage resistance of the tested object.
