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““Parallel Operation Of Alternators And Parallel Operation Of Alternators And Load SharingLoad Sharing” ”

Presented By Presented By Vikas Jangir Vikas Jangir

Electrical Engineering Electrical Engineering

ContentsContents IntroductionIntroduction Why this system is requiredWhy this system is required Parallel operation of alternatorsParallel operation of alternators Parallel alternator arrangementParallel alternator arrangement ProcessProcess ConditionsConditions ApplicationsApplications Advantages Advantages Summery & ReferencesSummery & References

IntroductionIntroduction It is necessary to provide an uninterrupted continuous It is necessary to provide an uninterrupted continuous

power supply. In case of an isolated plant, a power supply. In case of an isolated plant, a considerable amount of reserve capacity would be considerable amount of reserve capacity would be required to ensure the continuity of the supply. required to ensure the continuity of the supply.

Moreover some units are required either to be lightly Moreover some units are required either to be lightly loaded or floating on the lines in order to meet the loaded or floating on the lines in order to meet the unpredicted sudden increase in demand.unpredicted sudden increase in demand.

There will be two or more alternators connected in There will be two or more alternators connected in parallel called parallel connection of alternators. parallel called parallel connection of alternators.

The parallel operation of power station is essentially am The parallel operation of power station is essentially am extension of parallel operation of alternators, with the extension of parallel operation of alternators, with the exception of resistance and reactance's of the inter-exception of resistance and reactance's of the inter-connectors.connectors.

Why this system required.Why this system required.

uninterrupted continuous power supply.uninterrupted continuous power supply. For fulfill the load requirement.For fulfill the load requirement. Provide increase the overall efficiency.Provide increase the overall efficiency. For reduce per unit generating cost.For reduce per unit generating cost.

Parallel operation of alternators. Parallel operation of alternators. • The easiest way to setup a parallel system is to use The easiest way to setup a parallel system is to use

alternators that are exactly alike, or at least have the same alternators that are exactly alike, or at least have the same output rating and alternator pitch.output rating and alternator pitch.

• Another flexible pitch to backing up your power Another flexible pitch to backing up your power requirement is to have two or more alternators of variable requirement is to have two or more alternators of variable output.output.

• In either scenario these can be connected in parallel with In either scenario these can be connected in parallel with paralleling switchgear to achieve maximum output during paralleling switchgear to achieve maximum output during peak requirement or the desired minimal output during other peak requirement or the desired minimal output during other times.times.

Parallel alternators arrangement.Parallel alternators arrangement.

processprocess In the operation there are two alternators connected in In the operation there are two alternators connected in

parallel. parallel. Bus-bar, (to which a number of alternators are connected.)Bus-bar, (to which a number of alternators are connected.) The process of connecting an alternator in parallel with The process of connecting an alternator in parallel with

another alternator or with common bus-bar is called another alternator or with common bus-bar is called synchronizing. synchronizing.

The system is establish on the base of requirement of load.The system is establish on the base of requirement of load. In the process of A.C generator mechanical input is In the process of A.C generator mechanical input is

provided to rotate the alternator.provided to rotate the alternator.

Conditions.Conditions. For make system efficient and free from dangerous problem For make system efficient and free from dangerous problem

then some conditions are required.then some conditions are required. The terminal voltage of incoming alternator must be equal The terminal voltage of incoming alternator must be equal

to that of another alternator the bus-bar.to that of another alternator the bus-bar. Frequency.Frequency. Both alternators voltages are same or the bus-bar voltage Both alternators voltages are same or the bus-bar voltage

relative to the load.relative to the load. No circulating current b/w the winding and bus-bar and the No circulating current b/w the winding and bus-bar and the

incoming alternator.incoming alternator. Phase sequences must be same.Phase sequences must be same.

Applications.Applications. Power plants Power plants Industries & load sharing Industries & load sharing Other..Other..

Advantages Advantages Load sharingLoad sharing EfficiencyEfficiency Reduce lossesReduce losses Easy to operate Easy to operate Cheaper (reduce capital cost)Cheaper (reduce capital cost) Continuity of supplyContinuity of supply Save of fuelSave of fuel Other many advantages are…Other many advantages are…

SummerySummery In the parallel operation of alternators, we have learn about In the parallel operation of alternators, we have learn about

the hole system. And know the main advantages by this and the hole system. And know the main advantages by this and how we do in our electricity system, here we also studied how we do in our electricity system, here we also studied about the process of parallel operation and the applications about the process of parallel operation and the applications of these type of system.of these type of system.

Behind of everything there are one term that is WHY and Behind of everything there are one term that is WHY and here we know about this and how we utilize it in our system here we know about this and how we utilize it in our system and what are the main work for complete the task of and what are the main work for complete the task of electricity.electricity.

Questions..….?Questions..….?

Thanku.Thanku.