IEEE
IEEE 450-2020 is a recommended practice published by the Institute of Electrical and Electronics Engineers for the maintenance, testing and replacement of vented lead-acid storage batteries used in stationary applications such as substations, generating stations and telecommunications facilities. It covers inspections, periodic measurements, capacity testing and the signs that a battery is nearing the end of its life.
Editions cited: IEEE 450-2020
The practice is written for batteries that back up critical direct-current systems, including protection and control power, switchgear operation, emergency lighting and uninterruptible power. It describes the routine inspections and measurements that keep a battery healthy, the conditions under which a discharge test should be run, and the reasoning behind replacing a battery when its capacity has declined. Records receive particular attention, because trends in cell readings and capacity results over the years are what allow an owner to schedule replacement before an outage exposes a weak battery. Battery maintenance technicians, substation and plant engineers, and testing firms use it to structure maintenance programs and to interpret what they find in the field. The pages in this encyclopedia that cite IEEE 450-2020 explain battery capacity and connection resistance testing in general terms and point the reader to the document for the governing procedures and recommended values.