Electrical Laws

Ohm's Law Coulomb's Law Kirchoff's Law Faraday's Law Ampere's Law Joule's Law Lenz's Law Biot Savart Law

Electrical Theorems

Thevenin Theorem Nortons Theorem Super Position Theorem Reciprocity Theorem Compensation Theorem Maximum Power Transfer Millmans Theorem Tellegans Theorem

Electrical Rules

Flemings Left Hand Rule Flemings Right Hand Rule Cork Screw Rule

Electrical Network

Network Terminologies

Electrical Terms

Electrical Terms Materials Capacitors Resistors Inductor Self Inductance Mutual Inductance Magnetic Flux Magnetic Characteristics EMF MMF Permeability Sources Reluctance Torque

Electrical Transformer

Transformers How Transformer Works Transformer Classifications Types Transformers Core Type Transformers Ideal Transformers Parallel Operation Transformer Cooling Transformer Forces Transformer Losses Transformer Testing Transformer Bushing Transformer Windings

Types of Transformer

Auto Transformer Current Transformer Potential Transformer Rectifier Transformer Converter Transformer

AC Motor

Stator and Rotor Three Phase Induction Motor Induction Motor Transformer

AC Generator

AC Generators Alternator Stator Construction Alternator Rotor Construction Alternator - Parallel Operation Synchronizing AC Alternator Losses in Alternator

DC Motors

DC Motors Commutator Braking of Electric Motors Dynamic Rheostatic Braking Regenerative Braking Plugging Braking Speed Control DC Motor Losses DC Motors

Types Of DC Motor

DC Motors Types DC Series Motors DC Shunt Motors DC Compound Motor Brushless DC Motors Permanent Magnet DC Motor

Starter For DC Motors

Starters DC Motors

DC Generator

DC Generator Types DC Generators Sparking DC Generators Why Generator Overloading Losses DC Generators

Parallel Operation

PO - DC Generator Series DC Generator Shunt DC Generator Compound DC Generator
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Parallel Operation of DC Generators

Parallel operation of DC generators is required to meet the extra load demand. It is always difficult to meet the extra load demand by a single generator, or it is not possible to give supply when one generator is out of order. Some Reason for why to choose parallel operation of dc generator.


The generators that are sources of power are primarysafety items, and hence paralleled for reliability.


The load is not uniform. It is mazimum during the ON-peak hours and minimum during OFF-peak hours. The generators must operate most efficiency during full-load condition. It is preferred to use a single generator during light load.

Continuity of service:

Un-interrupted power supply is most important thing to satisfy the customers. If one generator is used, it becomes impossible to deliver un-interrupted power supply during its maintenance hours or breakdown.

Requirement for Parallel Operation Of DC Generator

Paralleling FC generator is required mainly for the following two types of situations.

  • Paralleling of shunt generators for the same or varying sizes.
  • Paralleling of compound generators of the same and varying sizes.

Conditions for Parallel Operation Of DC Generator

  • The terminal voltage must be the same.
  • The polarities of the generator must be identical.
  • The prime movers driving the armature of the generators must have similar and stable rotational characteristics.
  • The change of voltage with the change of load must be the same character.

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