基于Multisim 10的励磁电流采样回路仿真与分析

摘要

励磁电流是同步发电机励磁系统的重要参数，其采样的准确与否直接影响着励磁系统的正常运行。针对励磁设备在现场调试及运行过程中出现的由于励磁变副边CT接线错误而导致的励磁电流采样错误的现象，通过Multisim 10软件的仿真功能，对励磁电流采样回路进行了仿真分析。给出励磁变副边电流互感器各种不同接线情况下励磁电流采样的电压值，为现场调试及维护人员快速做出故障判断提供了重要的参考依据。%Excitation current is an important parameter of the excitation system for synchronous generator. The sampling ac⁃curacy of the excitation current directly affects the normal operation of the excitation system. The simulation function of the Multi⁃sim10 software was used to simulate and analyze the excitation current sampling circuit to eliminate the excitation current wrong sampling phenomenon appearing in spot debugging and operation process of the excitation system due to the wrong wiring of the CT. The voltage data got by different wiring methods of the CT is given. The method provided an important reference basis for the spot debugging and maintenance personnel to make the fault judgment quickly.