Design Of On-line Monitor System For Cable Temperature

In such enterprises as large-scale metallurgy, chemical industry, power plant, transformer substation, etc., with the improvement of the automatic level and the increasing of power consuming load,the consumption of the cable is getting more and more. A large number of cables are laid on the distance longer and complicated cable trough. These cables run under the environment of high voltage and large electric current for a long time, it is apt to cause temperature rising, temperature anomaly, and cause the cable lug exploding, which leads to the fire. Direct to fireproof question of the cable, this subject illuminates the software and hardware design process of an intact cable temperature monitoring system. It designs and adopts a network multipoint temperature model of'top management machine —single-chip computer —Temperature detector", which real-time controls temperature change of cable lug, in order to ensure the cable running safely and reliably. On the hardware, because there are many cable lugs in cable trough and the examining temperature point is scattering, it adopts two one-chip computers to carry on the data collection of temperature, and designs temporarily 40 examining temperature points. For improving transmitting dependability and increasing transmitting distance, the communication medium is shielding paired line in one-chip computer and host, the transmitting adopts serial interface, RS485 electric characteristics. On the software, making use of assembler language to one-chip computer program, it realizes the temperature collection of examining point.utilizing VC ++6.0 to host software program, it guarantees measuring result to be showed the users with line shape, form and bar three interface. And it guarantees the data be stored in the database, in order to analyse, inquire them in the future. In addition, this system has carried on the design of anti-interference from two respects of software and hardware, thus make systematic dependability get obvious improvement. In a word, the online monitoring system of electric cable temperature can monitor the temperature change of the electric cable in real time, alarms when the temperature is beyond the limit, finds the position of heating points, and informs professionals to tackle the problems in time. So it is the online monitoring system that ensures the electric cable safe to run, and avoid the economic loss.