
StarterStarter applicationA Boostcap module has been used to crank a 1520 kW (2400 HP) Pielstick diesel motor which equips the BB67000 locomotives belonging to the SCNF, the French railway national company. Today the storage device consists of a 72 Volts NiCd battery of 140 Ah with a weight of 500 kg. The test has been performed in the SNCF maintenance site of "QuatresMares" in the neighborhood of Rouen. The supercapacitor bank was made of 32 series connections of 6 parallel capacitors rated at 800 F, 2.5 VDC and a series resistance smaller than 2 mOhm. The complete bank presented a capacitance of 150 F, a series resistance of 10 mOhm and a nominal voltage of 80 V. To fulfill all the requirements the doublelayer capacitor module is connected in parallel with a battery which shows about a third of the size of the original one. The 60 kg module has provided a peak current of 2060 A. It does mean about 350 A for each pieces. The peak power delivered into the starter, limited by the load resistance, was 107 kW, which corresponds to a power density of 1.5 kW/kg. The NiCd battery delivers only a peak current of 1640 A in the same conditions, which corresponds to a power density of 0.1 kW/kg. The cranking has been also performed only with supercapacitors in 4 seconds. Moreover the test has shown that if the fuel injection is blocked, the supercapacitors are able to supply a cranking current longer than 15 seconds (the experiment is interrupted in order not to burn the coil). The full charging time of the supercapacitor bank is shorter than 2 minutes. With a battery, the corresponding required time is longer than 1 hour. Source: Garmanage: Roland Gallay
