On-load voltage regulation power transformer for 66kV transformer substation and assembly method

The invention relates to an on-load voltage regulation power transformer for a 66kV transformer substation and an assembly method, and belongs to the technical field of transformers. According to the technical scheme, low-voltage coils are connected in a Y connection mode through low-voltage leads, high-voltage coils are connected in a delta connection mode through high-voltage leads, the high-voltage coils and the low-voltage coils form a D yn11 connection group, an iron core (15) is of a three-phase three-column structure, and transformer body insulators (14) are arranged in the mode that the iron core, the low-voltage coils and the high-voltage coils with voltage regulating coils are arranged; the low-voltage coil adopts a foil winding type, and the high-voltage coil adopts a cylinder type and is of an integrated structure of a high-voltage main coil and a voltage regulating coil; a tapping lead of the voltage regulating coil is connected with the on-load voltage regulating switch (2), and voltage regulati