Rotor insulation of No.1 hydro-generator unit in Gongzui Hydropower Station is B degree

and has been in operation for over 30 years.Due to some factors such as operation ambient humidity etc.rotor insulation ability is debased

and seriously affects operation safety of the unit.In November of 2003

the stator coil

core and turbine of No.1 hydro-generator unit were reformed.By adopting some methods

for example

new ventilation system etc

rotor insulation has been improved remarkably

temperature rise of stator and rotor has been distributed uniformly and temperature rise is low

so it has reached the effect that generator capacity has increased by 10 MW.