Commutation in D.C. Motors
What is Commutation in DC Motor? Commutation is the process of reversal of current in the short circuited armature coil. […]
Electrical Machine
Electrical Machine
D.C. Motor: Working, Types, Application and their fault
What is D.C. motor? A machine that converts d.c. power into mechanical power is known as a D.C. motor. Its
Electrical Machine
Armature Reaction in D.C. Motors
Armature Reaction in D.C. Motors Armature reaction is expected because when current flows through the armature conductors of a d.c.
Interview
Interview question on DC Machine
Interview question on DC Machine Q: What are the essential parts of DC machine? Magnetic frame or yoke Poles Armature
Electrical Machine
Under Excitation Protection in Generators
Introduction Under Excitation Protection in Generators is a critical safeguard mechanism designed to prevent damage to synchronous generators (alternators) when
Electrical Machine
Motors used in domestic and industrial service
Domestic uses: Small universal motors of the series type are used in domestic appliances like vacuum cleaners, refrigerators, washing machine,
Electrical Machine
Rheostatic Braking of D. C. Series Motor
Rheostatic Braking of D. C. Series Motor Under normal running condition, the armature winding and series field winding are connected
Electrical Substation
Types of Bus Bar Protection and Why Bus Bar Protection required
Why Bus Bar Protection required? Busbars in the substation form important link between the incoming and outgoing circuits. If a
Electrical Substation
Types of Bus Bar Scheme in Electrical Substation
Introduction There are several ways in which the switching equipment can be connected in the electrical layout of substation. The
Case Studies
Lights Flickering in residential electrical system
Case Study This case study concerns Lights flickering in residential electrical system. The homeowners were experiencing lights flicker when loads
Electrical Substation
What is Voltage Stability and Voltage Instability in Power System
What is Voltage Stability? Voltage stability is concerned with the ability of a power system to maintain steady voltages at
Transformer
Transformer Oil Properties and Characteristic
What is Function of Transformer Oil? The purpose of use of transformer oil is dissipate heat by conduction through the
Electrical Machine
Direct Loading Test on Single Phase Transformer and Three Phase Induction Motor
Direct Loading Test on Single Phase Transformer The circuit diagram for the direct loading test is shown in the figure.
Transformer
Auto Transformer: Working Principle, Advantage, Application
What is Auto Transformer? A Transformer, in which a part of the winding is common to both the Primary and
Electrical Substation
11kV/400V Pole mounted sub-station
Layout of 11kV/400V Pole mounted sub-station Functions of different parts in pole mounted substation 1. Lightning arrestors- It provides a
Electrical Machine
Parallel Operation of D.C. Generators (In Detail)
Parallel Operation of Shunt Generator The generators in a power plant are connected in parallel through bus-bars. The bus-bars are
Transformer
Preventive maintenance and Check point of Transformer
Routine preventive maintenance of Transformer External inspection The transformer should be given an external inspection on a semiannual basis. The
Basic Electrical
Precautions to be taken while working on electrical installation
Precautions to be taken while working on electrical installation 1.Only qualified men do the work, untrained person should not allow
Electrical Machine
How to do maintenance of Induction Motor
General Check point and Maintenance of Induction Motor The machine should be stopped and isolated from all supplies before any
Electrical Substation
What is Electrical Substation and Types of Electrical Substation
What is Electrical Substation? The assembly of apparatus used to change some characteristic (e.g. voltage, a.c. to d.c., frequency, p.f.
Electrical Substation
GIS-Gas Insulated Substation
Define GIS Gas-insulated substations (GIS) are electrical substations where high-voltage electrical equipment is enclosed in a sealed environment filled with
Electrical Appliance
Electric Drive: Block diagram and Advantages
What is Electric Drive An electric drive is defined as a form of machine equipment designed to convert electric energy
Circuit Breaker
SF6 circuit breaker: Construction and working Operation
Construction of SF6 circuit breaker SF6 Circuit breaker consists of fixed and moving contacts enclosed in a chamber containing SF6
Electrical Substation
What is Isolator. Types of Isolator and their operation
What is function of Isolator? Isolator may be defined as a mechanical switch which isolates a part of the circuit
Electrical Machine
Shaded Pole Induction Motor
Construction of Shaded Pole Induction Motor A shaded pole induction motor is a simple type of self-starting single-phase induction motor.
Basic Electrical
Types of Lamp: Construction, working, Advantages and Application
Types of Lamp Incandescent Lamp Arc Lamp Fluorescent Lamp Mercury Vapour Lamp Compact Fluorescent Lamp (CFL) Halogen Lamp Sodium vapour
Basic Electrical
Faiveley type pantograph: Construction diagram and working
Constructional Diagram of Faiveley type pantograph In the case of 25 kV a.c traction system the contact wire of OHE
Electrical Substation
Safety point while work in Electrical substation
DO’s to Achieve Safety While Working in Substation Work on low & medium voltage mains and apparatus should be carried
Basic Electrical
Types of Railway Track Electrification
Types of Railway Track Electrification The three main types of electric traction systems that exist are as follows: Direct Current
Basic Electrical
What is Tariff and Types of Tariff . Suitable Tariff for Consumer
What is Tariff? Tariff is the way of billing energy consume by consumer OR the rate at which electrical energy