Blafalli-Vik - Norway

All works at the Blafalli-Vik hydropower plant in Norway were recently completed and the plant has started commercial operation. The contract for the large refurbishment and repair order was signed by SKL Produksjon AS and ANDRITZ HYDRO in December 2015.

In September 2015, the 270 MVA generator dropped out due to a stator earth fault. This was the result of a broken bolt on a pole winding support, which had loosened and damaged the core.

ANDRITZ HYDRO was contacted to support the dismantling of the unit for a closer inspection. A Core Induction Test (loop test) was performed, following which the customer ordered a new stator core from ANDRITZ HYDRO. The winding was re-used, therefore dismantling was performed carefully. Every single bar had to be inspected and tested before preparation for re-winding. A set of new spare bars was also manufactured.

Furthermore, the customer awar­ded a second order to ANDRITZ HYDRO for the refurbishment of the turbine, after an inspection revealed problems there as well.

TECHNICAL DATA

Output235 MW / 270 MVA
Head365.5 m
Speed333.33 rpm
Runner diameter3,686 mm
Av. annual production710 GWh

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