The present invention relates to {HEAD ~ a fail safe system} in {TAIL ~ a control unit} for a reversible pump turbine apparatus 
in
The present invention relates to { HEAD ~ a fail safe system } in { TAIL ~ a control unit } for a reversible pump turbine apparatus
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH