According to reports, the Hyderabad metro rail will be energy-efficient like a hybrid car. It will be able to regenerate 45 per cent of the energy required when it accelerates, brakes and cruises along the 66 overhead stations spread across the three corridors.
Power is fed back into the grid when the train slows down during deceleration depending upon the viaduct gradient and when the brakes are applied. Metro trains are built to travel to 90 kmph and will be allowed a speed of up to 80 kmph by the rail safety authorities but considering a station nearly a kilometre, the expected speed will be 35 kmph.
“It will still be three times the speed of prevailing road traffic,” points out Hyderabad Metro Rail (HMR) Managing Director N.V.S. Reddy. Such will be the momentum that the trains can easily cruise for 10 seconds in case of a power failure by which it can reach or be within the striking distance of the next station.
A protective mechanism to tackle any grid collapse will be in place as every station will have back-up diesel generators and UPS. Well ventilated stations and overhead viaduct are a big plus, compared to underground ones as it will not be that difficult to disembark commuters even if the trains halt midway at stations in case of any emergency, he explains.
Metro rail authorities have tied up with Transmission Corporation of A.P. for having dedicated lines where a 132 KV is converted to 25 KV for running the trains. Power point will be the high voltage overhead line atop the train and not between the tracks down as was imagined earlier for aesthetics due to technical issues.