IEEE 1115:2000 pdf download.IEEE Recommended Practice for Sizing Nickel-Cadmium Batteries for Stationary Applications.
This recommended practice covers the sizing of nickel-cadmium batteries usel in full float operation for stationary applications. Installation, maintenance, qualification, testing procedures, and consideration of battery types other than nickel-cadmium batteries are beyond the scope of this recommended practice.
Design of the dc system and sizing of the battery charger(s) are also beyond the scope of this recommended practice.
1.2 Purpose
The put jxse of this recommended practice is to provide a proven and standardized sizing technique for nickel-cadmium batteries. This sizing meth(xI takes normal usage factors into account, and forms the basis for reliable battery operation.
2. References
This standard shall be used in conjunction with the following publications:
IEEE Std 1106-1995, IEEE Recommended Practice for Installation, Maintenance, Testing, and Replacement of Vented Nickel-Cadmium Batteries for Stationary Applications.
IEEE Std 1184-1994, IEEE Guide for the Selection and Sizing of Batteries for Uninterruptible Power Systems.
3. Definitions
The following definitions apply specifically to this recommended practice. For terms not defined in this clause, please refer to the documents listed in Clause 2.2
3.1 aailable capacity: The capacity for a given discharge time and end-of-discharge voltage that can be withdrawn from a cell under the specific conditions of operation.
3.2 battery duty cycle: The loads a battery is expected to supply for specified time periods.
3.3 full float (constant potential) operation: Operation of a dc system with the battery, battery charger, and load all connected in parallel and with the battery charger supplying the normal dc load plus any self- discharge or charging current required by the battery. (The battery will deliver current only when the load exceeds the charger output.)
3.4 period: An interval of time in the battery duty cycle during which the load is assumed to be constant for purposes of cell sizing calculations.
3.5 rated capacity (nickel-cadmium cell): The capacity assigned to a nickel-cadmium cell by its manufacturer 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 a constant current charge, in accordance with IEC 623 (1990-03) [B2].
4. Defining loads
4.1 General considerations
The duty cycle imposed on the battery by any of the conditions described here will depend on the dc system design and the requirements of the installation. The battery must supply the dc power requirement when the following conditions occur:
a) The load on the de system exceeds the maximum output of the battery charger.
b) The output of the battery charger is interrupted.
c) The ac power is lost [may result in a greater de power demand than in item b) above].
The most severe of these conditions, in terms of battery load and duration, shoukl be used to determine the battery size for the installation.IEEE 1115 pdf download.