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What is Emergency Power Supply?

Views:87     Author:Site Editor     Publish Time: 2019-12-02      Origin:Site

Emergency Power Supply systems provide automatic backup power in the event of normal power loss.

They are required by code and shall provide power within 10 seconds to all life safety systems such as egress lighting, smoke evacuation, fire alarm systems, elevators, etc. Simply put, anything that will protect the lives of the building occupants should be on Emergency Power. Another important thing to remember is that emergency power supply must be completely separate; this means that they shall have their own conduit runs, their own panels, their own transfer stations, etc. 

Working Principle of EPS

So what is backup power? A backup power system should be designed to provide electricity to the most important pieces of equipment in a building. It is not cost effective to have backup power available for every electrical component in a building. Most facilities, even the most critical, can be ramped down during an outage so that fuel or battery power can be conserved.

Backup power is supplied by a generator, which is essentially an engine that burns fuel to produce electricity. The generator can be a reciprocating or a turbine engine, but reciprocating are usually preferred because they start up quicker and are more economical.

Generator testing and maintenance are critical to the success of backup power systems. Generators and all components of the system should be tested regularly to ensure that they will be operational when needed. As with any engine, routine maintenance will prolong the life and increase the efficiency of the generator.

There are a variety of fuels that can be used, including diesel, gasoline, natural gas and liquid petroleum. Diesel is the most common due to its cost and the fact that it is safer to store than gasoline. The fuel is usually stored on site in a series of tanks. A day-tank (not necessarily a full day of fuel) is located near the generator and provides an immediate and constant amount of fuel. Large installations will also have a bulk storage tank that may be located away from the generator. The bulk storage tank holds enough fuel for a long outage; this fuel is pumped to the day-tank as needed. Fuel in any storage tank must be constantly used or mixed to prevent degradation.

Application of EPS

Emergency Power System includes switching power supply, adjustable power supply, power converter, battery charger etc.. As stated earlier, life safety systems are always required to be on an Emergency Power System. This includes lighting of egress paths, power for sprinkler pumps, and power to fire alarm systems. Hospitals will put life-saving equipment, like respirators, on standby power. Fire and Police Stations will make sure that their radio systems are on standby power so they can manage operations during emergencies.

Homeowners are free to size their standby generators to meet their needs. Refrigerators, freezers, and sump pumps are normally on circuits tied to the backup system, as are lights throughout the home. A few convenience outlets are also put on the system to allow phones to be charged and to keep a television or radio operational during major outages. Fuel storage capacity tends to be the limiting factor for the size of a home generator - you want to have enough fuel to keep the system operational through the outage; therefore, many of life's conveniences are turned off to conserve fuel.

Thus,Emergency Power Supply is of vital importance in daily life.

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