宋天斌,吴迪,乐文静.互感器二次压降及二次负荷模拟测试系统研究[J].电测与仪表,2012,49(4):64-67. SONG Tian-bin , WU Di , YUE Wen-jing.Research on the Simulation Test System of Instrument Transformer Secondary Voltage Drop and Secondary Load[J].Electrical Measurement & Instrumentation,2012,49(4):64-67.
互感器二次压降及二次负荷模拟测试系统研究
Research on the Simulation Test System of Instrument Transformer Secondary Voltage Drop and Secondary Load
Instrument transformer secondary voltage drop and secondary load,which directly related to the energy measurement error,are items that must be periodically tested by the power system.This paper has explored a simulation test system which can imitate the field environment of training for the power technical staff.In this system,the voltage and current instrument transformer secondary output are simulated by three-phase voltage and current source,the secondary voltage drop and secondary load are simulated by resistance and reactance sequence.The wiring mode contains the three-phase three-wire system and three-phase four-wire system.The digital signal processor(TMS320F206) is adopted as the core controller to control the parameters of the various analog devices,while the A/D conversion and operational amplifier analog circuits is employed to collect voltage,current value,power factor,transformer secondary load value,etc.The entire system is controlled by the host computer software,using RS485 serial communication protocol.Experiments show that this system has high stability and reliability,and the simulated testing indicators meet the technical requirements of field-testing.
