Why DC battery 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. Only a battery can give continuous power supply until it fully discharges. The battery has electrical energy storing capability that’s why it can be used for backup power supply.

What is the function of DC battery?

DC batteries use direct current, which flows in a single direction and is generally used to power small appliances, radios, laptops, mobile phones and other electronic gadgets.

What battery is used in substation?

In industrial or substation applications mainly three types of batteries are used namely: Vented / Flooded Lead Acid batteries. Sealed maintenance free batteries/Valve Regulated Lead Acid. Nickel Cadmium (Ni-cd) batteries.

Why DC is used in relay?

The circuit breakers which are used to switch large quantities of electric power on and off are actually electromechanical relays, themselves. DC power is used because it allows for a battery bank to supply close/trip power to the breaker control circuits in the event of a complete (AC) power failure.

What is DC system in substation?

The DC system is the most important component of a high voltage industrial/utility substation. It supplies the energy needed to manage the protective devices and high voltage components and allows electrical faults to be safely isolated. Most high voltage substations house either a sealed or flooded cell battery bank.

Which supply is used for control equipment in substation?

Varying principles are used in the auxiliary power supply of the equipment. An important principle is to limit the distribution of the auxiliary power supply to the protection system as much as possible, and to use only one supply to the protection of an object and the breaker trip coil.

What is DC power supply?

A DC power supply, also known as a bench power supply, is a type of power supply that gives direct current (DC) voltage to power a device. A DC power supply management subsystem can use AC, DC, battery, or ultralow voltage as inputs.

What is the use and importance of batteries in a substation?

It supplies the energy needed to manage the protective devices and high voltage components and allows electrical faults to be safely isolated. Most high voltage substations house either a sealed or flooded cell battery bank. In a normal functioning system, the batteries provide very little current.

What are DC contactors?

A DC contactor is an electrically controlled device designed to switch current on and off. DC contactors control current in DC circuits by closing and opening internal contacts. DC contactors control much lower voltages than AC circuits and offer the benefit of minimal arcing as the circuit opens and closes.

What is difference between AC and DC relays?

A Dc relay coil has resistance that limits the dc current. An AC coil relies on its impedance for governing the current. An AC relay will remain contact closed due to mechanical inertia and a little mechanical hysteresis and, the fact that an alternating north and south pole both attract the relay armature.

What is DC distribution panel?

DC load distribution panels are an integral part of safe, efficient communications site designs. Multiple loads can be connected to allow a DC power supply to distribute power to multiple devices such as radios, repeaters, switches and links.

What is the purpose of DC distribution in a substation?

Answer Wiki. , BTech. DC distribution is needed in Sub-station to provide power supply to Control & Protection equipment situated in Substation in case of outages/faults. Generally DC power is used for this purpose instead of AC, since the reaction time of the protective device is less, operating on DC supply.

Why is the energy supply to a substation always available?

Since the DC system supplying specially relay protection, control, and interlocking circuits is of paramount importance to the substation’s reliable and safe operation, the energy supply has to be always available.

Why do you need a battery charger for a substation?

A substation battery charger ensures all the essential electrical systems in a substation continue to operate in the event of a power outage. An absence of an electrical supply could result in damage to equipment and personnel. The DC system is the most important component of a high voltage industrial/utility substation.

Can a power substation have more than one DC system?

A power substation can have one or several DC systems. Factors affecting the number of systems are the need for more than one voltage level and the need for duplicating systems. Today, normal DC auxiliary supply systems in power substations are operating either on the 110 V or 220 V level, though lower levels exist.