The Design Of Preventing Electricity-stolen System For Public Power Facilities

With the development of social economy and the increase of electricity consumption, Social power theft problem is becoming more and more prominent. The common method at present to steal the electricity includes changing the electric energy metering device, changing a component in the measurement device or changing the power lines. The methods above all need to contact the measurement device to steal electricity resource. However, for the public electricity lines, the common method to steal electricity is bypassing the metering device. So it is significant to design a preventing electricity-stolen system for public power facilities to crackdown on the action of stealing electric power.A preventing electricity-stolen system for public power facilities is designed according to the characteristics of public facilities utilization. Load waveform of public facilities utilization can be recorded in the system and a waveform database is established. If the electricity is stolen, the system will cut off the behavior quickly and send message to relative staffs.The theory of wavelet analysis is used to compare the data collected by the data acquisition card and the data in the database. If the electricity-stolen behavior occurs, the load waveform of the system is non-stationary. Then by using the theory of singularity and the wavelet modulus maxima, the load signal is multi-resolution decomposed and the moment of electricity-stolen behavior is confirmed. Simulation system is established in MATLAB/SIMULINK to verify the method mentioned above.MC35IGPRS communication module, high-speed data acquisition chip AD7606, CPU28335, voltage transformer and current transformer consist the hardware part of the public power facilities preventing electricity-stolen system. Also signal conditioning circuit is designed, PCB of the circuit is drawn and made, program of software is written and the experiments are carried out. The results indicated that the system designed in this paper can cut off the electricity-stolen as reliably and quickly.