Research On Measurement Technology Of High Voltage Current Based On Current Transformer

With the rapid development of science and technology, powerful grid network isgradually developing towards intelligence, automation, integration. The level demand ofpower transmission equipment, measurement equipment and protection equipment aboutpowerful system will be much higher. With gradually increasing of the voltage level, themeasurement result will be much more accurate, and we need to further optimize theperformance of safe and reliable about measurement equipment. Because of iron core thatthe traditional electromagnetic current transformer contains, it is easy to produce thephenomenon of magnetic saturation and ferromagnetic resonance, affecting the precisionof the measurement results. The traditional transformer is much more unable to meet themeasurement requirements, it is especially important to create a new type of currenttransformer.The electronic current transformer is to measure high voltage current in this paper.Rogowski coil will be as a sensing part in the equipment of electronic current transformer.It introduces the working principle, structure parameters, the equivalent circuit, dynamicanalysis and the influencing factors of the Rogowski coil. The research is mainly focusedon the data transformation system about high voltage side, that contains integral element,filter, phase adjustment and V/F converter. The corresponding circuit is designed, andsome analysis and simulation are given. Compared with other power supply modes,optical power circuit provided by the555oscillator from low voltage side to high sidemeasurement system is adopted in this paper, the powerful supply circuit and thecorresponding voltage conversion circuit is Designed. Optical fiber is used as medium inBoth transmission signal and power transmission. The selection of the conversion devicetype and design of peripheral circuit are given.In the low pressure side, the data processingis divided into analog part and digital part. It mainly introduces the analog signalprocessing in this paper, digital pulse signal is converted into analog current signalthrough using D/A converter. The system of signal processing part is simulated throughthe software of Proteus simulation, and we get the simulation waveform of the circuit, the practical significance of the electronic current transformer measurement system is proved.