Nickel-cadmium batteries to back up Turkish locos
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Saft Industrial Batteries product story
Edited by the Engineeringtalk editorial team
May 6, 2003
Turkish State Railways is to replace the onboard batteries on 26 Toshiba electric locomotives with Saft SRM sintered/pbe technology.
After an international tender, Turkish State Railways (TCDD) has decided to replace the onboard batteries on 26 Toshiba electric locomotives with Saft SRM sintered/pbe technology.
Turkish State Railways (TCDD) is switching to Saft SRM rechargeable nickel-cadmium batteries to provide a reliable source of low-maintenance back-up power on 26 of its Toshiba electric locomotives type E43000.
The Saft batteries, which are being supplied via the Turkish agent UTO Engineering, will replace the existing onboard pocket plate batteries.
The SRM design features sintered positive and plastic-bonded negative electrodes (sintered/pbe) which make it up to 20% smaller and lighter than conventional batteries of similar performance, an important consideration in modern rolling stock applications which place a key emphasis on low weight for maximum energy efficiency.
In addition it is extremely reliable, it does not suffer the "sudden death" failure that can afflict lead acid batteries, and can provide a long service life of up to 15 years.
This extended lifetime exceeds the minimum lifetime required by the UIC 854 R railway specification by more than six times.
The SRM is capable of supplying emergency discharges within a wide temperature range, from -50 to +70C, and can tolerate deep, often uncontrolled cycling.
It has excellent charging characteristics, reaching over 90% capacity after 5h, and also resists arid conditions and heavy vibration over long periods without any affect on its operational capability.
A further advantage of the SRM design for TCCD is that the battery will need no special attention between normal rolling stock maintenance examinations.
Replenishment with distilled water is only required at two-year intervals, and there is no need to change the electrolyte during the battery's lifetime.
The existing onboard batteries comprised 12 crates of six cells each.
This caused TCDD to reduce the charging voltage to 110V.
The installation of the new Saft batteries, comprising 82 SRM 105 P cells - in 13 crates of six cells and one crate of four cells - will enable the charging voltage to be respecified to the original 120V.
The SRM 105 P cells being supplied to TCCD have a 105Ah capacity and feature plastic containers in compact stainless steel crates.
SRM cells are available in a capacity range from 46 up to 440Ah.
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