What is Power quality measurement and Power quality measurement device
What Is Power quality measurement Solving power quality problems depends on acquiring meaningful data at the optimum location or locations […]
Electrical Substation
Circuit Breaker
Circuit Breaker working principle and Methods of arc extinction
What is Circuit Breaker? In electrical circuits, a Circuit breaker is used for making and breaking the circuit. As per
Electrical Substation
Bus bar protection scheme in a substation
Introduction of Bus bar protection Bus bar protection scheme shall be provided for 220KV system where the sub-station layout arrangement
Electrical Substation
DC distribution in 132 KV, 220 KV, 400 KV Control and Relay Panel in substation
DC distribution for 400KV system Two sets of batteries (220v), their respective chargers and DC boards shall be used for
Circuit Breaker
Types of Circuit Breaker testing and SF6 breaker testing
Circuit Breaker Insulation Resistance Test Use Megger to measure insulation resistance. Insulation Resistance Tests to be done: Pole – Pole
Circuit Breaker
ELCB: Working principle, Full name and Circuit diagram
Full name of ELCB ELCB-Earth Leakage Circuit Breaker What is ELCB An ELCB is one kind of safety device used
Circuit Breaker
Types of Circuit Breaker and their working principle
Types of Circuit Breaker The CBs are of six types: Oil circuit breaker Air circuit breaker SF6 circuit breaker Vacuum
Transformer
What is DGA(DISSOLVED GAS ANALYSIS) for transformer oil
What is D.G.A. ? It is study of gases formed in the transformer oil. It is a diagnostic tool helping
Circuit Breaker
HVDC Circuit breaker: Working, Types and Application
Fullname of HVDC CB High Voltage Direct Current Circuit Breaker (HVDC CB) Definition of HVDC Circuit breaker Circuit breakers will
Electrical Substation
What is Float charging and Boost Charging of battery
What is Battery charger Battery charger is battery charging equipment which used float and boost charging techniques for battery charging.
Electrical Appliance
What is Clamp on Ammeter and working and measurement procedure
Introduction The clamp on ammeter is a portable instrument designed to give a quick measurement of current flow, without breaking
Electrical Substation
What is Reactive Power and Reactive Power compensation,it’s calculation
Definition of Reactive Power Reactive power(VARs) is defined as the amount of power that remains unused and gets generated within
Transformer
Types of Transformer Losses and their calculation formula
Definition of Loss Loss in any machine is broadly defined as difference between input power and output power.An electrical transformer
Transformer
Parallel Operation of Two Transformers
Why Parallel Operation of Transformers required By parallel operation we mean two or more transformers are connected to the same
Interview
Interview and short exam Question for Electrical engineer-PART-1
Interview and short exam Question for Electrical engineer What happens if I connect a capacitor to a generator load? Answer
Electrical Substation
Case studies on Method for replacing faulty battery cell in electrical substation
How to replace faulty Battery Cell in Electrical Substation If we want to replace the battery cell named “B”. Now
Electrical Substation
What is Battery and their charging method in Electrical Substation
Definition In science and technology, Battery is a device that stores chemical energy and makes it available in an electrical
Circuit Breaker
Understand SF6 Circuit Breaker rating parameter
Introduction A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by
Electrical Substation
What is Lightning Arrester(LA) and their Leakage current measurement(LCM) testing
Definition Lightning Arrester (LA)/surge arrester is a protective device used for limiting the affect of surge voltages on the equipment
Case Studies
Case studies on Transmission Line fault due to Bird
In recent power system, Continuity of Power transmission line is most challenging work for every engineer. Different types of fault
Case Studies
Case studies on 220kV Bus fault occurred in humid weather at 220kV Substation
Occurrence At 220kV Substation, 220kV Bus fault occurred at early morning humid weather condition. All line connected to Bus are
Transmission Line
Different types of Protection on Transmission line
Types of Protection on Transmission line Line protection is achieved by following protection system: Distance Protection Over current and Earth
Electrical Substation
Understand Relay and their Logic. What is Numeric relay?
Definition An electric device that is designed to respond to input conditions in a prescribed manner and, after specified conditions
Transmission Line
Earth fault Relay protection in Power Transmission Line
Definition of Earth fault relay Earth fault relay is used to sense ground or earth-faults i.e. L-G faults and L-L-G
Transmission Line
Plug setting (PSM) and Time setting multiplier in Overcurrent protection of Transmission line
Overcurrent relay operates when load current exceeds pre-set value i.e. pick up value. Transmission lines, distribution lines, large power equipment
Transmission Line
Directional overcurrent relay protection in Power system
A radial feeder fed from one end protected by overcurrent relay, fails to maintain uninterrupted supply when circuit breaker near
Transmission Line
What is Directional or reverse power relay and their working and application
Definition Directional feature is realized by comparing the direction of flow of line current with reference to the bus voltage
Transmission Line
Over current protective schemes in Power Transmission/Distribution system
Introduction Power Transmission/Distribution system i.e. radial feeders uses overcurrent protection scheme. Feeder is divided in two or more section and
Electrical Appliance
What is Contactor and their working, types and application
Definition A Electrical contactor is an electrical device which is used for switching an electrical circuit on or off.A contactor
Electrical Machine
Negative phase sequence and stalling and Under voltage protection of induction motor
Negative phase sequence protection of induction motor In case of open circuit fault developed at supply terminal or one pole