The Research Of Cable Tunnel Comprehensive Monitoring Technology

The development of power industry and urbanization process leads the overhead transmission line to be replaced by power cable line.The amount of cable has gradually increased in the proportion of the entire transmission line,and the power cable's coverage and asset size is growing at an unprecedented rate.Cable lays underground and the environment in the tunnel is complex.In addition to the running statue and device statue of the cable,the statue of the environment such as the temperature and humidity can also affect the normal operation of the cable,thus affecting the stable operation of the entire transmission network.Therefore,ensuring the safe and normal operation of power cable is very important to the development of national economy and the security and stability.On the basis of research statue cable monitoring technology and presentation of technique about the cable,this paper overall designs the on-line monitoring system of cable tunnel,including cable tunnel monitoring system's overall architecture,system functions and system configuration and so on,and introduces the environmental monitoring,the ampacity and interbedded current monitoring,partial discharge monitoring,video surveillance and security plasma system in detail.This paper designs the on-line partial discharge monitoring subsystem,researches the partial discharge location technology,analyzes the corresponding relations between the location of partial discharge source and the sensor monitoring results,gives the localization criterion of the partial discharge source,and verifies the correctness of positioning criterion through the examples.To solve the environmental problems in the process of the use of the cable tunnels,the paper designs cable tunnel environmental monitoring subsystem,including architecture design,temperature and humidity sensor selection,the sensor probe protective treatment,on-site power supply and signal transmission methods and so on.