IEEE 1188a-2014 pdf download

IEEE 1188a-2014 pdf download.IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications Amendment 1 : Updated VRLA Maintenance Considerations
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. Insert the following reference in numerical order: IEEE Std 1491™, IEEE Guide for Selection and Use of Battery Monitoring Equipment in Stationary Applications.
3. Definitions Change the following text: For the purposes of this recommended practice, the following terms and definitions apply. The glossary in Annex G and The Authoritative Dictionary of IEEE Standards Terms should be referenced for terms not defined in this clause. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause. 2 3.1
expected service life: The anticipated period of time in which a battery will deliver its expected performance for a specific application and environment.
Insert the following definitions in alphabetical order: acceptance test (battery): A capacity test made on a new battery to determine if it meets specifications or manufacturer’s ratings.
battery cabinet: A structure used to support and enclose a group of cells. battery rack An open structure used to support a group of cells/units.
capacity test (battery): A discharge of a battery at a constant current or a constant power to a specified voltage.
internal ohmic measurement : A measurement of the electronic and ionic conduction paths within a cell or unit, expressed in terms of impedance, conductance, or resistance performance test (battery): A constant-current or constant-power capacity test, made on a battery after being in service. premature capacity loss (PCL): Significant lead-acid battery capacity loss, occurring without any of the traditional wear-out mechanisms, which may be reversed by proper charging if secondary effects have not damaged the active material.
service test (battery): A special test of a battery’s capability, in an “as found” condition, to satisfy the battery duty cycle. state of charge: The stored or remaining capacity in a battery expressed as a percentage of its fully- charged capacity.
terminal connection (battery): External connections made between cells/units, or at the positive and negative terminals of the battery, which may include terminal plates, cables with lugs, and connectors. unit: Multiple cells in a single container.
valve-regulated lead-acid (VRLA) cell: A lead-acid cell that is sealed with the exception of a valve that opens to the atmosphere when the internal pressure in the cell exceeds atmospheric pressure by a pre- selected amount. VRLA cells provide a means for recombination of internally generated oxygen and the suppression of hydrogen gas evolution to limit water consumption.
5. Maintenance
5.2 Inspection
Insert the following paragraph at the end of the paragraph in 5.2:
If a monitoring system is installed, some of these readings can be obtained automatically. Activities such as visual inspections will always need to be completed manually. See IEEE Std 1491 for more information.
5.3 Corrective actions
Insert the 5.3.3 immediately after 5.3.2:
5.3.2 Special Recovery Process
Structurally intact cells exhibiting PCL (Premature Capacity Loss) may have their useful life extended by a special recovery process. This process is applicable for absorbed glass mat (AGM) type VRLA cells only (see C.8).
7. Procedure for battery tests
7.3 Test length and discharge rate
7.3.2 Discharge rate
Change the second paragraph as shown:
In the previous 1996 revision of this recommended practice, the discharge rate for the time-adjustment method was adjusted for cell temperature before conducting the test. This previous method of temperature compensation is acceptable. In this revision, the time-adjustment method is revised to apply the temperature correction to the capacity calculation after completion of the test. Users may transition to this new method at an appropriate time, for example, at battery replacement.IEEE 1188a pdf download.IEEE 1188a-2014 pdf download