Research On The Error Theory Of Induction Current Divider And Design Of Compensation Module

Today's power system is increasingly important for safe and stable operation.The current transformer is an important device for providing measurement,measurement and protection for the power system.The working performance of the current transformer will directly affect the current measurement,the accuracy of the measurement and the accuracy and reliability of the operation of the power transmission and protection device.As a special type of auto-coupled current transformer,the inductive shunt is highly efficient for current transformer calibration and range expansion of current comparators,especially for power frequency and small current magnitude traceability.Due to the excitation error in the core during the measurement process of the inductive current divider,this excitation error exists in the measurement principle of the inductive current divider,and the electrical methods such as winding and material selection of the inductive current divider cannot be eliminated.This kind of error.The use of an electronic method to reduce or eliminate the excitation error of the inductive current divider is a development trend and research hotspot to improve the accuracy of the inductive current divider.The subject carried out research on the electronic compensation technology of 10-6-level induction current divider,proposed the electronic compensation technology of the inductive current divider,studied the theoretical model and error principle of the inductive current divider,and theoretically analyzed the error characteristics and current of the inductive current divider.Commonly used error compensation methods for transformers.Based on this,the technology of active electronic compensation is studied.Various methods of active compensation of transformers are analyzed.An electronic compensation module with low drift,low error,high signal-to-noise ratio and good electromagnetic compatibility is designed.A PID-based error compensation module consists of four parts: a voltage amplifier,an integrator,a differentiator,and a low-pass filter.The integrator implements the integral function and suppresses the integral drift.The voltage amplifier can adjust the amplification factor of the signal appropriately,and the low-pass filter improves the signal-to-noise ratio.The PID based error compensation module includes: In this subject,Keil software was used for the SCM C language compilation,Multisim and Protues software were used for circuit simulation,and Altium Design software was used for PCB circuit board drawing.Finally,in order to verify the accuracy compensation effect of the active compensation electronic circuit for the inductive current divider,the corresponding inductive current divider verification circuit and error test were carried out.