A chain containing motor drives and a docking station for the Generator Inspection Vehicle (GIV) is mounted around one of the retaining rings of the generator. The chain is positioned accurately in front of each slot so that the GIV can be inserted into a gap as small as 17 mm (0.67 inch) and up. The GIV then moves to the other end of the stator core and back in order to perform the LFCT, Wedge tightness test and visual inspections all in the same run to save time.
Low flux leakage test
Electromagnetic core flux leakage testing (ELCID or equivalent) is a standard feature. The step irons are measured with a separate module.
Wedge tightness testing
The GIV is provided with a stator wedge tap tester that
determines the wedge tightness based on spectral analysis of the sound response.
The GIV is equipped with 4 camera modules: a forward-viewing camera is used for general inspection of the stator teeth and wedges, another camera inspects the rotor body and cooling slots, and 2 further cameras inspect the stator cooling slots.