Abstract
Background: Higher requirements for electric power measurement and accounting systems make it urgent to increase the accuracy of their components, including voltage measuring transformers (VT). Various methods of error compensation are used to improve the VT accuracy class. The existing devices can compensate for the VT error only partially or manually, which makes it quite timely to develop a device of fully automatic VT error compensation. Materials and methods: Calculations of electrical circuits are made on the basis of symbolic method and vector diagrams method. Results: Methods of minimizing voltage transformer errors have been analysed. An algorithm has been developed for automatic VT error compensation in response to VT secondary load change and any load within the range regulated by normative documents. A device has been developed that implements the algorithm and minimizes voltage transformers error and increases their load capacity. Conclusions: The developed device of automatic error compensation can improve the VT accuracy class, which will reduce the error of the electric power metering system in 6–35 kV distribution networks.
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