Intelligent medium-voltage power cable and test system and test method thereof

Abstract

The invention relates to the technical field of power cables, in particular to an intelligent medium-voltage power cable and a testing system and method thereof, and the intelligent medium-voltage power cable comprises an optical fiber temperature sensor, a cable insulation wire core, a communication optical cable, an optical fiber vibration sensor and an external coating layer, the number of the cable insulation wire core is at least one, the number of the communication optical cable is at least one, and the optical fiber vibration sensor is arranged in the external coating layer. By arranging the optical fiber temperature sensor and the optical fiber vibration sensor, the cable has the functions of conductor temperature monitoring, cable vibration monitoring and data transmission, the cable line temperature can be sensed, the abnormal temperature and the occurrence position can be found, the current-carrying capacity of the cable can be effectively improved, and the utilization rate and the use value of the cable can be improved. Meanwhile, cable faults can be effectively prevented, the functions of sensing and positioning in advance are achieved, the reliability of a cable line is improved, and safe and stable operation of a power system is guaranteed.

Description

technical field [0001] The technical field of power cables involved in the present invention is specifically an intelligent medium-voltage power cable and its testing system and testing method. Background technique [0002] In recent years, the rapid development of society and the acceleration of urbanization, the rapid expansion of cities have led to an increase in power loads year by year, while the grid technology has been rapidly improved, the grid voltage level has been continuously improved, and the scale of grid construction has been continuously expanded. more stringent requirements. [0003] As an important transmission carrier of the urban power system, the medium voltage power cable not only affects the reliability of line power supply, but also affects the safe operation of the entire power system. The breakdown of cable insulation and the occurrence of fire are mostly related to the aging and defects of insulating materials, and the operating temperature of cab...

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Problems solved by technology

[0004] At present, the applied distributed optical fiber temperature measurement technology (DTS) and distributed optical fiber vibration measurement technology (DVS) mainly use one or more temperature measurement and vibration optical fiber sensing units placed along the outside of the cable or outside the cable core. DTS monitors the temperature of the outer sheath or insulation of the cable in real time, and then calculates the real-time temperature of the conductor through complex mathematical model calculations, and locates the abnormal point of the fault whose temperature exceeds the set value in real time. However, the actual cable laying environment is usually more complicated, and many The circuit load is variable and the surrounding environment state will change with the passage of time and space, resulting in a large deviation of the conductor temperature data

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