Study on Calibration System for Electronic Transformers Based on High - Accuracy PCI Card

With preliminary applying of Electronic Transformer (ET) based on IEC 61850 standards in power grid, the calibrations of tested transformers have attracted extensive research attention. This study proposes a novel Calibration System of ET (CSET) based on high-accuracy card. Data acquisition of ET and Standard Trans-former (ST) is gotten by optic Ethernet and PCI-4462 data acquisition card, respectively. Meanwhile, the synchronized sampling between ET and ST is completed on the optic/electronic pulse signal of PCI synchronization card. The signals processing and human interface are realized by Labview software. The system proposed in the study is feasible for calibrating Electronic Voltage/Current Transformers (EVT/ECT) of different voltage classes. System tests show that the precision of the system can get to 0.2°.