Research on measurement accuracy of EVT during the surge

Electronic Transformers (ETs) are the most important equipments of the Smart Grid. There are many optics and electronics devices used in the ETs, and they usually work under the high voltage part or low voltage part of primary equipments, so the ETs are easily interfered by the complex electromagnetic environment. This article aims to improve the measurement accuracy of the Electronic Voltage Transformer (EVT) during the surge test, find out the root cause and put forward two solutions. One solution is for the output of the power and the other is for the input of the power. We have finished the theoretical analysis and experimental verification, and proved that they are worked to improve the reliability of the EVT.