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 Shunt Generators

Generator 1 is connected to the bus bars and supplies the load. Generator 2 is required to be connected in parallel with generator 1 to supply a part of the load.

Procedure to be followed during paralleling of DC shunt Generators

Generator 2 is speeded up to the rated voltage by means of a prime mover. The switch S3 is closed and a voltmeter is placed across the open switch S2. The excitation of the generator is changed until the reading of the voltmeter connectrd across the open switch S2 is zero. At this instant, the voltage of the generator 2 is same as the voltage of the generator 1. When the switch S2 is closed, the generator 2 will be in parallel with generator 1. As a result, generator 1 supplies the entire load, whereas generator 2 is in floating stage. To shift the entire load from generator 1 to generator 2, the switch S1 must be opened. To shift the load manually as per requirement, the field rheostats of generator 1 and generator 2 is to adjust and the corresponding reading of current in ammeters A1 and A2 should be observed very carefully.

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