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