IEEE 1188-2005 pdf download

IEEE 1188-2005 pdf download.IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead- Acid (VRLA) Batteries for Stationary Applications
4.2 Protective equipment Although VRLA cells can vent or leak small amounts of electrolyte, electrical safety is the principal but not the only concern for safe handling. The following minimum set of equipment for safe handling of the battery and protection of personnel shall be available:
a) Safety glasses with side shields, goggles, or face shields, as appropriate.
b) Electrically insulated gloves, appropriate for the installation.
c) Protective aprons and safety shoes.
d) Portable or stationary water facilities in the battery vicinity for rinsing eyes and skin in case of contact with acid electrolyte.
e) Class C fire extinguisher. Note that some manufacturers do not recommend the use of CO 2 fire extinguishers due to the potential for thermal shock.
f) Acid neutralizing agent.
g) Adequately insulated tools.
h) Lifting devices of adequate capacity, when required.
NOTE—Although VRLA cells are designed to minimize electrolyte leakage, neutralize any electrolyte with a bicarbonate of soda mixed with approximately 0.1 kg/L of water or other appropriate neutralizing agents. 3
4.3 Precautions
The following protective procedures shall be observed:
a) Use caution when working on batteries because they present a shock and arcing hazard.
b) Check the voltage to ground (ac and dc) before working around the battery. If the voltage is other than anticipated, or is considered to be in an unsafe range, do not work on the battery until
the situation is understood and/or corrected. Wear protective equipment suitable for the voltage.
c) Prohibit smoking and open flame, and avoid arcing in the immediate vicinity of the battery.
d) Provide adequate ventilation, and follow the manufacturer’s recommendations during charging.
e) Ensure unobstructed egress from the battery work area.
f) Avoid the wearing of metallic objects such as jewelry while working on the battery.
g) Ensure that work area is suitably illuminated.
h) Follow the manufacturer’s recommendations regarding cell orientation.
i) Follow the manufacturer’s instructions regarding lifting and handling of cells.
Uninterruptible power system (UPS) or other systems might not be equipped with an isolation transformer.
In addition to dc voltage, an ac voltage might also be present. Lack of an isolation transformer may provide a direct path to ground of the dc supply to the UPS. This can substantially increase the electrocution and short-circuit hazards.
4.4 Procedures
The following safety procedures should be observed:
a) Restrict all unauthorized personnel from the battery area.
b) Keep the battery clear of all tools and other foreign objects.
c) Avoid static buildup by having personnel contact ground periodically while working on batteries.
d) Do not remove the pressure relief valves without the battery manufacturer’s approval.
e) Inspect and test instrumentation for safe working condition.
5. Maintenance
5.1 General
Proper maintenance will prolong the life of a battery and will aid in assuring that it is capable of satisfying its design requirements. A good battery maintenance program will serve as a valuable aid in determining the need for battery replacement. The users must consider their particular application and reliability needs if maintenance procedures, other than those recommended in this document, are used. Battery maintenance should be performed by personnel knowledgeable of batteries and the safety precautions involved.
5.2 Inspection
All inspections should be made under normal float conditions if possible. Readings should be taken in accordance with the manufacturer’s instructions. Refer to Annex B – Annex D for more information. All measurements and observations should be recorded for future comparisons.
5.2.1 Monthly
A monthly general inspection should include a check and record of the following:
a) Overall float voltage measured at the battery terminals.
b) Charger output current and voltage.
c) Ambient temperature.
d) The condition of ventilation and monitoring equipment.
e) Visual individual cell/unit condition check to include
1) Cell/unit integrity for evidence of corrosion at terminals, connections, racks, or cabinet.
2) General appearance and cleanliness of the battery, the battery rack or cabinet, and battery area, including accessibility.
3) Cover integrity and check for cracks in cell/unit or leakage of electrolyte.
f) Excessive jar/cover distortion.
g) DC float current (per string). This should be measured using equipment that is accurate at low (typically less than 1 A) currents. (See C.6.)IEEE 1188 pdf download.IEEE 1188-2005 pdf download