Abstract
The general concerns of the studies presented in this article are determination of the requirements and development of the alternative indirect method for testing transformation accuracy of distorted voltages and higher frequency signals by the wideband resistive-capacitive voltage dividers. The increase of the rms value of the input voltage causes increase of the internal temperature and the probability of malfunction, including initiation of the partial discharges, additionally increased with frequency of the higher harmonics. Changes of these conditions may cause considerable variations of the equivalent capacitance and resistance of the wideband voltage dividers. Therefore, their testing with decreased rms value of distorted input voltage, as permissible by the standard IEC 61869-11, may result in determination of significantly different frequency characteristics of ratio error and phase displacement, than it is for rated conditions. In order to ensure transformation accuracy for rated input voltage of the wideband voltage divider the zero comparative method may be used. Applied rms value of voltage to each part of the wideband voltage divider under construction must result from its rated input voltage. Developed procedure provides conditions needed to obtain rated equivalent capacitance/resistance of each part of the wideband voltage divider during its development. This ensure its required transformation accuracy for rated input voltage. However, to preserve the proper level of its insulation to ground the test to exclude additional increase of the leakage current with increase of the input voltage must be made. The principle of application of proposed idea is verified by determination of the frequency characteristics of ratio error and phase displacement of tested wideband voltage dividers for their rated input voltage. Therefore, they may be used as a reference voltage source for testing transformation accuracy of voltage transformers and other dividers.
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