Introduction Since the loads having the trends towards growing density. This requires the better appearance, rugged construction, greater service reliability […]
Phase Shifting Transformer (PST) A special kind of transformers like PST or Phase Shifting Transformer is used to control the
Definition of Transformer Vector Group The transformer vector group show the phase difference between the primary and secondary sides of
No load Test on 3-phase Induction Motor This test is similar to OC test of transformer. It is used to
Introduction Non-conventional source of energy like wind energy offers several advantages. Due to fast depletion of conventional sources, man has
Introduction Generators are the most expensive equipment in an ac power system. A 210 MW turbo-generator which includes an alternator,
Definition of Current Transformer Current Transformer (CT) are used for reducing / stepping down ac current from higher value to
What is Insulation Resistance? Insulation resistance (IR) of an electrical equipment refers to the resistance between conducting part and earth.
Method of Underground Cable laying Laying Underground Cables can be done by the 3 methods namely: Direct Laying Draw in
What is MOCB These types of circuit breakers utilize oil as the interrupting media. However, unlike bulk oil circuit breaker,
Introduction This type of circuit breakers, is those kind of circuit breaker which operates in air at atmospheric pressure. After
Step for Calculation of Relay Operating Time In order to calculate the actual relay operating time, the following things must
Why Dc series motor is never started without load We know that the armature current is decided by the load.
What is Power System? The power system is a network which contain generation, distribution and transmission system. It involves process
Auto changeover of Motor in Industries Induction motors are often used to drive critical loads. In some industrial applications, such
Application certification type tests in the factory or laboratory The objective of application certification type tests (also known as functional
Differential Relay Setting Power transformer rating = 30 MVA Voltage Ratio = 33/66 kV Rated voltage (in kV) HV side
Transformer is a device having two windings which are magnetically coupled & when one winding is excited by AC supply
Back EMF in DC generator In generator, when a conductor cuts the magnetic flux, an EMF gets induced in the
MCCB full name MCCB-Moulded Case Circuit Breakers Difference between MCCB and MCB MCCBs have higher fault current withstand capacities compared
What is Tan Delta testing of Cable? Tan Delta, also called Loss Angle or Dissipation Factor, is a diagnostic method
When electrical energy transmission methods were used, it was noted that if the voltage is sent by, for example, 100
Nameplate information for all NEMA(National Electrical Manufacture Association) motors Manufacturer There is no defined design for this field, and it
Several Current transformer CT winding arrangements are used. These are described in the following sections. Wound primary type This type
Among the various possible methods used to achieve correct Overcurrent relay co-ordination are those using either time or overcurrent, or
What is Alternating Current(AC) ? Alternating current is the rate of flow of electrical charge through a conductor. I =
Introduction At start the squirrel cage induction motor is just like a transformer with short-circuited secondary and, it will draw
What is Crawling? It is observed that induction motors, particularly the squirrel-cage type, some-times exhibits a tendency to run stably
The speed of an induction motor is given as N = 120f/p (1-S). So obviously the speed of an induction
What is an LED? LEDs are semiconductor diodes, electronic devices that permit current to flow in only one direction. The
