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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Current Transformers

Current Transformers are step up transformer.

Current transformers are used to step down the current rating because lower current rating can only be allowed to pass through ammeter and current coils of wattmeters.

Current transformer is a static device having two windings called primary and secondary, to transfer power from primary to secondary with suitable change in level of current. Current transformer basically has a primary winding with a few turns having large cross-sectional area. This side is connected in series with the line carrying high current. Whereas secondary winding is made up of many turns of fine wire having rating of 5 A current. This end is connected to low range meter such as ammeters and current coils of wattmeters. Current transformers are basically step up transformer because of the principle "higher the voltage, lower the current". If I1 and I2 be the current in primary and secondary sides and N1 and N2 be the number of turns of primary and secondary winding, Then it is given by. The current transformer's secondary winding should not be kept open. If it is kept open, secondary current will be zero and ampere turns produced by the secondary will be zero. Since the secondary ampere turn oppose the promary ampere turns, the back emf will be zero. Hence, unopposed primary produces heavy flux in the core, which causes excessive core losses and even cause insulation damage to the transformer, which is dangerous while the transformer is in operation.

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