Can Voltage Pulses Be Used for VT Frequency Characterization?

The frequency characterization of instrument transformers is a topic of ongoing discussion, and the identification of a standardized methodology to perform it is still an open issue. Among the possible approaches discussed in international standards and literature, the use of pulse signals is particularly attractive due to the rapidity of execution and their compatibility with existing standard tests already performed on voltage transformers. In this context, this paper investigates the pros and the issue of using impulsive voltages as test waveforms for the MV voltage transformers wideband characterization. The study is conducted from both the theoretical and experimental point of view by performing preliminary tests on two commercial sensors.