Research And Design Of The High-voltage Acquisition Unit In Electricity Anti-stealing System

With the increasing demand for electricity,electricity stealing has become an illegal means for individuals or certain factories to reduce economic costs,resulting in the increasing prevalence of electricity theft.In all types of electricity stealing,the simplest and most important way is to change the current data in electricity meter,but changing the data of the high-voltage side current is not easy to achieve.Therefore,after measuring the high-voltage side current,the data on the side of the meter can be compared to better achieve the purpose of electricity anti-stealing.First of all,the method of electricity stealing and anti-stealing methods are researched,and the high-voltage supply and high-voltage meter is selected to compare the current on the high-voltage side with the meter,and the high-voltage supply and low-voltage meter is selected to compare to the apparent power on the high-voltage side with the meter.According to the demand,the high-voltage acquisition unit is designed,by get energy from coil and current detection,the Permalloy is selected as the core material.The charge and discharge efficiency of the SuperCap in the system are calculated,and the power scheme of the coil as the main power,the SuperCap as the auxiliary power,and the battery as the backup power is designed.Through the thermal design and sampling error analysis of the sampling resistor,the low temperature drift sampling resistor is selected and the temperature compensation is carried out,and the direction of power output is determined by measuring the electric field.Comparing the transmission requirements of wireless communication devices,choose LoRa wireless communication method.Then,the high-voltage acquisition unit are designed by Altium Designer.The experimental prototype is built and the current sampling,get energy from coil and wireless communication experiments are carried out.Finally,the reliability of the high-voltage acquisition unit is further verified by the field test of the electricity anti-stealing system.In this thesis,through the analysis and research on the way of stealing electricity,and base on the research of current stealing,the high-voltage acquisition unit of anti-stealing system is researched and designed in detail.The same CT coil is used for getting energy and detection,and the high-precision measurement under low current is realized,which provides a certain reference value for the way of electricity stealing prevention.