Non-contacting High Voltage Cable Signal Acquisition And Processing

Monitoring and measurement of the high voltage is the precondition of relay protection and is important to prevent accidents happened in electricity transmission network, so it is of important practical significance to design an apparatus which with high security, robust stability and good real-time response to monitor high voltage cable. Non-contacting measurement has become the development trend of measurement of high voltage cable with the advantages of safe, convenient and many other aspects. This dissertation targeted to design software systems and hardware systems of the new apparatus according to the characteristics of the process which the signal has been obtained.The interference caused by high frequency, random noise and the same frequency signals are tough problems while the non-contacting measurement carried on. So author studied the basic principles of signal processing algorithms at first and then designed an efficient filtering algorithm based on mathematical morphology to solve the interference caused by high frequency random noise, and also designed an practical correlation algorithm based on probability theory and mathematical statistics to solve the interference caused by same frequency signals, all algorithms are simulated through the Matlab and migrated to DSP.In order to fully meet the trend of development of the power equipment,the performances of the system must have quick real-time response, intelligent operation, high-quality network communication and execellent scalability, so author selected the architecture of system based on ARM + DSP dual processor, then designed ARM control module, DSP data processing module and HPI interface circuit which in charge of data transfer between ARM and DSP. Additionally, author designed drivers and applications based on the Linux 2.6 Kernel operating system, and developed applications based on the DSP/BIOS real-time kernel.The simple and quick Mathematical morphology filtering algorithm together with the powerful ARM+DSP dual-processor system is the base which the good performance of real-time response and scalability are guaranteed..