Research on Selection Technology of General Current and Voltage Transformer Equipment in Substation

With the large-scale construction of power grid, the technical parameters of transformer equipment are more and more diversified and complicated. Through the study of the main technical parameters of transformer equipment in 35~750kV substation, the optimization selection should be 7 or 9 windings about the winding number of current transformer with voltages of 330kV and above, the winding number should be maximum configuration to 6 windings with voltages of 220kV and below. The maximum rated burden for current transformer with a rated secondary current of 1A is 15 VA. In addition to converter transformer alternating current side, the secondary windings of voltage transformers can be uniformly optimized to 4 windings with an accuracy class of 0.2/0.5(3P)/0.5(3P)/3P. The optimal selection parameters of voltage transformer rated capacity and secondary burden are studied and proposed. General transformer equipment selection technology can effectively improve the equipment quality and reliability.