Apparatus for impact testing for electric generator stator wedge tightness

Apparatus for measuring the tightness of stator wedges in the stator of an electric generator without removing the rotor, said apparatus comprising:

• a low profile remotely controlled carriage insertable in a narrow gap between the rotor and stator and successively positionable adjacent selected stator wedges;
• an impactor carried by said low profile carriage, said impactor striking the selected stator wedge to set up a mechanical vibration therein;
• a vibration detector carried by said low profile carriage detecting deflection of the selected stator wedge as said wedge vibrates in response to being struck by said impactor;
• and
• means seismically isolating said vibration detector from said impactor.

Apparatus for measuring the tightness of stator wedges retaining stator coils in stator slots distributed around the interior of a horizontally oriented electric generator stator without removing the generator rotor, said apparatus comprising:

• a low profile carriage insertable in a narrow gap between the rotor and stator and successively positionable adjacent selected stator wedges in selected stator slots;
• an impactor carried by said low profile carriage and having an impactor head which strikes said selected stator wedge setting up a mechanical vibration therein, and means applying to said impactor head a driving force adjusted for the effect of gravity on the impactor head such that said impactor head strikes the selected stator wedge with a selected force at all stator slots around said horizontally oriented stator;
• and
• a vibration detector carried by said low profile carriage detecting deflection of the selected stator wedge as said wedge vibrates in response to being struck by said impactor head with said selected force.