T1 and T2 transformers being switched on after maintenance on protection CT's.<br />The inrushcurrent makes an interesting sound in the transformer core when the 33 kV circuit braker closes. These TX's are rated at 12.5 MVA and working voltages of 33 / 11 kV and supplying a local suburban area in Auckland, New Zealand.<br />The inside 11 kV switch gear is South Wales.
