dear sir
the following tests are recommened:
1-polarization index test for checking the dryness of stator windings.
2-check cold D.C resistance for stator winding
3-check the quality of the bearings &greases used .
4-check the dirtness of the windings,clean and dry if needed
5-check current...
dear sir
normally in all power plants which i work G.E &WESTINGHOUSE designs,green colour represent running condition and red is stopping condition,no especial standard is being created for that,but normally green colour is more visable from long distances than red.