IEEE 1568-2003 pdf download IEEE Recommended Practice for Electrical Sizing of Nickel-Cadmium Batteries for Rail Passenger Vehicles
1.Overview
This recommended practice describes a method for defining the electrical load supplied by a nickel-cad-mium battery and for sizing the battery to supply that load. Necessary factors relating to cell selection areprovided for consideration. In order to utilize the methodology embodied in this recommended practice, it isnecessary it be used in conjunction with IEEE Std 1476TM -2000
1.1 Scope
This recommended practice prescribes a method for electrical sizing of nickel-cadmium batteries for use onpassenger rail cars used for batery back up of low voltage dc auxiliary power systems. It encompasses allactors that influence the electrical battery capacity requirements including loads, temperature, cycling.charging and discharging profiles. lt does not address physical sizing, qualification or testing of the batteries.and it does not apply to batteries used for motive power or engine starting.
1.2 Purpose
This recommended practice provides a standardized method for electrical sizing of nickel-cadmium batteriesfor application and use aboard rail passenger vehicles.
2. References
This recommended practice should be used in conjunction with the following publications
IEC 60623 (2001-09). Secondary Cells and Batteries Containing Alkaline or Other Non-Acid Electrolytes-Vented Nickel-Cadmium Prismatic Rechargeable Single Cells.
IEEE Std 1476-2000, IEEE Standard for Passenger Train Auxiliary Power Systems Interfaces.3.4
IEEE Std 1536rm -2002,EEE Standard for Rail Transit Vehicle Battery Physical Interface
3. Definitions, abbreviations, and acronyms
3.1 Definitions
For the purposes of this recommended practice, the following terms and definitions apply, IEEE 100rx , TheAuthoritative Dictionary of 1EEE Standards Terms IB3). should be referenced for terms not defined in thissubclause.
3.1.1 aging factor: A quantitative factor expressing the degradation in the ability of the battery, due tousage, to deliver electrical energy under specified operating conditions such as, but not limited to, operatingambient temperature,cycling, depth of discharge, and maintenance practices.
NOTE–This is based on experience, application (cycling/float service), and charging parameters
3.1.2 available capacity: The capacity for a given discharge time and end-of-discharge voltage that can bewithdrawn from a cell under the specific conditions of operation.
3.1.3 battery duty cycle: The loads a battery is expected to supply for specified time periods.
3.1.4 constant current loads: A load that demands constant current even when the input voltage varies.
NOTE–Typical of such loads is lighting when driven from an inverter ballast configuration.
3.1.5 constant power load: A load that demands constant power from the source even when the voltagevalue drops such as when switching from the low-voltage power supply to the battery.
NOTE-Typical of such loads are those that have their own built-in regulator such as propulsion control power supplies
3.1.6 fully charged capacity: state of the battery charge following a constant current charge. Considered tobe 100% state of charge of the new battery.
NOTE-Constant current charge in accordance with IEC 60623
3.1.7 period: An interval of time in the battery duty cycle during which the load is assumed to be constantfor purposes of cell sizing calculations.
3.1.8 rated capacity (nickel-cadmium cell): The capacity assigned to a nickel-cadmium cell by its manuacturer for a specific constant current discharge, with a given discharge time, at a specified electrolyte temperature, to a given end-of-discharge voltage. The conditions used to establish rated capacity are based on aconstant current charge.
IEEE 1568-2003 pdf download
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