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 […]
Electrical Substation
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
Electrical Substation
Types of tests in power system according to IEEE Standard
Application certification type tests in the factory or laboratory The objective of application certification type tests (also known as functional
Transformer
Transformer IDMT, Differential and all Relay setting calculation
Differential Relay Setting Power transformer rating = 30 MVA Voltage Ratio = 33/66 kV Rated voltage (in kV) HV side
Electrical Machine
Induction motor as a generalized transformer
Transformer is a device having two windings which are magnetically coupled & when one winding is excited by AC supply
Electrical Machine
What is Back EMF in DC Motor and their Significance
Back EMF in DC generator In generator, when a conductor cuts the magnetic flux, an EMF gets induced in the
Circuit Breaker
MCCB circuit Breaker and their application
MCCB full name MCCB-Moulded Case Circuit Breakers Difference between MCCB and MCB MCCBs have higher fault current withstand capacities compared
Electrical Substation
What is Tan delta cable testing
What is Tan Delta testing of Cable? Tan Delta, also called Loss Angle or Dissipation Factor, is a diagnostic method
Case Studies
Use of impedances in the electrical network-Shunt Reactor
When electrical energy transmission methods were used, it was noted that if the voltage is sent by, for example, 100