High-Voltage Power Cable Temperature Data Acquisition And Information Processing System

With the rapid development of national economy,continual improvement of urban construction and modernization of enterprises,the consumption of electric energy is increasing.The vertically and horizontally along the corridor of the transmission lines are being replaced by the underground power cable supply system. In recent years,the sensor measurement technique of distributed optical fiber is one of the pop questions in the sensor measurement field and this technology in high-voltage power cable has been applied to temperature system. Distributed optical fiber sensor system can detect a single fiber at the same time multi-point temperature (or stress and other physical quantities), and it can make use of OTDR locate the temperature in the temperature field.The paper researches Raman Distributed Optical Fiber Temperature Sensor systems through analyzing its measuring principle.The most important part of distribute fiber temperature-measured system are signal collecting,data processing and background software programming.They decide the collecting precision,collecting speed and final response time. We make a comparison between double channel temperature signal demodulation method and single channel temperature signal demodulation method at the same time.And depending on it,we put forward a double channel temperature signal demodulation method;It doesn't only adwances the signal Noise Ratio of the system,but alse makes the sensitiveness of the system measure temperature an enormous enhancement.High-speed data acquisition system is mainly composed of high-speed AD9288 and the TMS320VC5402 DSP to complete the acquisition of signals through the serial port will collect the data sent to Host PC——serial communication, in PC with Visual Basic development platform design, interface cable temperature display to achieve the state display. Experimental results show that high-voltage power cable temperature measurement system which is formed by the distributed sensing technology and high-speed data acquisition cards, has fast response, high accuracy, and can be real-time temperature measurement, alarm, memory and history inquiries.