High Speed Over-Speed Balance
High-speed balancing (HSB) of generator and turbine rotors offers a number of advantages. These include smooth operation, access to optimal weight planes, and verification of the mechanical integrity of the rotor and any assembled components (rotors are typically run to 110% overspeed). With generators in particular, it enables electrical testing of rotors through their entire speed range. This can identify the existence of any speed related electrical faults.
Toshiba recommends and offers high-speed balance for problem rotors or rotors that operate above their first critical speed. Through this process, balance weights can be properly placed while taking bending mode shapes into account. Such rotor characteristics would include those that had: