XLPE cable: Construction, Voltage rating, Advantage
Introduction Cross linked polyethylene (XLPE) insulated single core and multicore cables are manufactured with colours of cores red, yellow, blue […]
Transmission Line
Electrical Substation
Waveform Distortion: DC offset, Harmonics, Notching, Noise
What is Waveform Distortion? Waveform distortion is defined as a steady-state deviation from an ideal sine wave of power frequency
Electrical Substation
What is Voltage Sag and Swell in Power quality
What is Sag (dips) in Power quality? A sag is a decrease to between 0.1 and 0.9 pu in rms
Electrical Machine
Synchronous motor: Definition, Work, Industrial Application and Comparison
What is Synchronous Motor? Synchronous motors are synchronous machines used to convert electric power to mechanical power. Synchronous motors can
Interview
Basic Electrical Interview question
1.What is static electricity? Static electricity means electricity at rest. If we join a charged conductor to another conductor, electricity
Electrical Machine
What is Stepper Motor and their 3 types and Application
What is Stepper Motors? Stepper motor is known by its important property to convert a train of input pulses i.e.,
Circuit Breaker
What is Switchgear in Electrical Engineering
What is Switchgear ? The apparatus used for switching, controlling and protecting the electrical circuits and equipment is known as
Electrical Substation
Electrical Substation: Standard Practice and Maintenance Points
Introduction A modern electrical power system catering to huge energy demands are spread over extensive areas. It contains several major
Interview
Interview Question on Electrical Motor
Interview Question on Electrical Motor What are the types of AC three phase motors? Mainly there are two types. A)
Electrical Machine
Types of single phase induction motors and their diagram
Introduction A standard single-phase induction motor has two windings placed at an angle of 90° to each other. One of
Transformer
Transformer Differential Protection and their diagram
Transformer Differential Protection Percentage differential protection is used for large power transformers above 5 MVA rating for the protection against
Interview
Interview Question for Electrical engineer and ITI Electrician
Interview Question for Electrical engineer and ITI Electrician What is electric traction? Answer: Traction means using the electric power for
Transformer
Polyphase Transformers and their connection
What is Polyphase Transformers? Almost all the major power generation and distribution systems in the world today are three-phase ac
Electrical Appliance
Ramp Type Digital Voltmeter
What is Digital Voltmeter? A digital voltmeter (DVM) displays the value of a.c. or d.c. voltage being measured directly as
Transformer
Sumpner’s test or back to back test on Transformer
Sumpner’s Test conducted to Transformer to determine Sumpner’s test or back to back test on transformer is method for determining
Transmission Line
Underground Cable: Their types, Rating, insulation material, advantages
Introduction Since the loads having the trends towards growing density. This requires the better appearance, rugged construction, greater service reliability
Transformer
Special Transformer Types and Application
Phase Shifting Transformer (PST) A special kind of transformers like PST or Phase Shifting Transformer is used to control the
Transformer
What is Transformer Vector Group and Types of Vector group
Definition of Transformer Vector Group The transformer vector group show the phase difference between the primary and secondary sides of
Electrical Machine
No load and Locked/Blocked Rotor Test on 3-phase Induction Motor
No load Test on 3-phase Induction Motor This test is similar to OC test of transformer. It is used to
Renewable Energy
Wind energy basic component and site selection
Introduction Non-conventional source of energy like wind energy offers several advantages. Due to fast depletion of conventional sources, man has
Electrical Machine
Types of Generator Protection in Power Plant
Introduction Generators are the most expensive equipment in an ac power system. A 210 MW turbo-generator which includes an alternator,
Electrical Substation
Current Transformer: Definition, working, Burden and open circuit condition
Definition of Current Transformer Current Transformer (CT) are used for reducing / stepping down ac current from higher value to
Electrical Substation
Insulation resistance and Polarizing Index(P.I)
What is Insulation Resistance? Insulation resistance (IR) of an electrical equipment refers to the resistance between conducting part and earth.
Transmission Line
Underground Cable laying Standard Method
Method of Underground Cable laying Laying Underground Cables can be done by the 3 methods namely: Direct Laying Draw in
Circuit Breaker
Minimum Oil Circuit Breaker or MOCB
What is MOCB These types of circuit breakers utilize oil as the interrupting media. However, unlike bulk oil circuit breaker,
Circuit Breaker
Air Circuit Breaker: Working, Operation and their advantages
Introduction This type of circuit breakers, is those kind of circuit breaker which operates in air at atmospheric pressure. After
Electrical Substation
Calculation of Relay Operating Time
Step for Calculation of Relay Operating Time In order to calculate the actual relay operating time, the following things must
Electrical Machine
Why Dc series motor is never started without load
Why Dc series motor is never started without load We know that the armature current is decided by the load.
Electrical Substation
What is Power System and Structure of Power system
What is Power System? The power system is a network which contain generation, distribution and transmission system. It involves process
Electrical Machine
Auto changeover switch of Motor in Industries
Auto changeover of Motor in Industries Induction motors are often used to drive critical loads. In some industrial applications, such