standards / manuals / guidelines for small hydro development - AHEC

Check list for Transformers• Cooling water system• Firefighting system• Transformer cooling oil pump position• Buccholz relay• Oil level in conservator• Colour of silica gel• IR of winding and core• BDV of oilCheck list for Switchyard• Compressed air in case of ABCB• SF 6 gas pressure in case of SF 6 breaker• Earthing switch position• Isolator position – close• Breaker position – off• Line isolator position2.2.4 Operations(i)(ii)(iii)Inlet Valve Opening• Put oil pumps on ‘auto’ mode• Open compressed air valve• Open bye pass manual valve• Give opening command to bye pass auto valve• Check water pressure for equalizing• Give opening command to inlet valve• When inlet valve is fully open oil pumps must be stoppedTurbine Operation• Put oil pumps on auto mode• Open HP compressed air valve• Open LP compressed air valve• Open cooling water for bearings• Open shaft seal water• Put brake on auto mode• Release lock pin• Fix GV opening limit• Put machine on auto modeGenerator Operation• AVR on manual mode• Cooling water for transformer on• Oil circulation of transformer on• Keep fire fighting system alert• On D.C. supply for excitation flashing• At 30% of generator voltage D.C. supply from battery cuts• Now generator excitation supply get from excitation transformerAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 6