Self-powered Research And Design Of High Voltage Transmission Line Monitoring Equipment

Monitoring the transmission line state parameters is an effective way to improve the saf-e operation of the transmission line.Due to the special nature of online monitoring equipment installation environment,the power supply strategy and power supply technology is one of the key monitoring equipment and reliable operation.Traditional solar power,laser power supply,etc.is limited by environment,load capacity,it's difficult to meet the demand for stable power supply of the monitoring equipment,the high-voltage transmission line induction power supply device take more and more attention.On the basis of summarizing the existing power supply,this paper design an induction power supply device utilizing Faraday's principle?The device obtained inductive energy from induced electromagnetic field generated by the current,through the power conversion circuitry to power to the monitoring device.this paper analyses the relationship between inductive energy and the core structures,air gap,material,etc.parameters of the current transfoner core.And power conversion circuit includes a rectifier circuit,PWM conversion circuit and overvoltage,overcurrent protection and bleeder circuit.The PWM conversion circuit select BUCK converter,this paper also analyzes the factors affecting the switching frequency,researches on the selection of the switching frequency and the power loss caused by the switching frequency and studies BUCK converter modulation mode,control mode and manner of loop compensation.Prevent excessive inductive energy caused by transmission line continued large current by introducing a control coil.When the rectified output voltage of draw-out coil is greater than a threshold voltage,the control coil put into use,in order to provide reverse flux,inhibiting transmission line continued large current on the secondary side of the circuit.On the basis of complete power supply design,this paper verifies through experiments,wound the draw—out coil,build a rectifier and filter circuit,the BUCK converter,controller and protection circuits,and debug experiment.Through system design and simulation experiments to verify the methods that combination current transformer induction powering with Ssuper capacitor The inductive energy is managed at different levels,to achieve voltage and power indicators meeting the needs of monitoring equipment when the transmission line current in wide variations.