Reference voltage divider designed to operate with oscilloscope to enable determination of ratio error and phase displacement frequency characteristics of MV voltage transformers

The goal of the paper is to demonstrate that simple and cost effective resistive voltage divider compensated with capacitance can provide high accuracy transformation of MV voltage in a wide frequencies range. Therefore, it may be applied in the measuring system with the oscilloscope as a reference voltage dividers to determine accuracy of transformation of distorted and sinusoidal voltages up to 20 kHz by the 2 kV/100 V voltage transformers. This thesis is supported by determined in developed wattmeter-based measuring system constructed 2 kV/100 V voltage dividers and inductive voltage transformer ratio and phase errors frequency characteristics. Differential measurements of rms values and phases between output voltages of two produced voltage dividers with same voltage ratio were carried out in order to verify the accuracy of ratio and phase errors frequency characteristics determination.