What is the use of battery room in substation?

Battery rooms are provided for backup and uninterruptible power supplies (UPS) for process control functions. They are usually provided at or near the facility control room or electrical switchgear facilities. Battery rooms should be provided with ventilation to limit the concentration of hydrogen to 1\% by volume.

Why is battery room ventilated?

It is common knowledge that lead-acid batteries release hydrogen gas that can be potentially explosive. The battery rooms must be adequately ventilated to prohibit the build-up of hydrogen gas. During normal operations, off gassing of the batteries is relatively small.

Why is special lighting used in battery rooms?

LIGHTING. For vented batteries, room lighting should be intrinsically safe to avoid explosions caused by sparks igniting hydrogen gas. For VRLA batteries normal lighting may be used. This does assume that the correct battery charging characteristics are used and correct ventilation has been provided.

Is 1332 a battery room?

Legislation advises the number of air changes per hour, for example IS:1332 Battery Rooms advises 12 air changes per hour, or suggest that hydrogen concentration levels are kept below 1\% to avoid the risk of explosion.

Do battery rooms need ventilation?

Adequate ventilation is required to prevent classification of a battery location as a hazardous (classified) location in accordance with Article 500. Title 29 Code of Federal Regulations — Ventilation shall be provided to ensure diffusion of the gases from battery and to prevent accumulation of an explosive mixture.

Why DC voltage is used in substation?

The main reason for using DC supply in substation or power stations is to provide a continuous power supply to the control circuit. DC is a reliable source of power supply because it can obtain from batteries. So during power failure also, we have to provide the continuous power supply to the control circuit.

Is battery room a hazardous area?

The hazardous area classification of a battery room is required due to the potential presence of hydrogen gas (Group B).

What are the safeties in the battery room?

Battery room environment must be dry and well ventilated. Battery tops shall be clean and dry, and terminal nuts must be tight and a smear of petroleum jelly applied to prevent corrosion. Electrolyte at proper level, and shall have correct value of specific gravity by checking with a hydrometer.

Is code a battery room?

NFPA 70: National Electric Code 2017, Chapter 480, Storage Batteries, Code 480.10(A), Battery Locations, Ventilation – “Provisions appropriate to the battery technology shall be made for sufficient diffusion and ventilation of gases from the battery, if present, to prevent the accumulation of an explosive mixture.”

Do batteries give off gas?

When batteries are being recharged, they generate hydrogen gas that is explosive in certain concentrations in air (explosive limits are 4.1 to 72 percent hydrogen in air). The ventilation system can exchange an adequate amount of fresh air for the number of batteries being charged.

What is the difference between AIS and GIS?

GIS high voltage substation engineering uses the gas sulfur hexafluoride for insulation, whereas AIS uses air insulation in a metal-clad system. GIS systems use fixed, mounted circuit breakers.