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Power Angle Characteristic Curve of Synchronous Machine

Torque Angle versus Load or Power Angle:

These three terms Torque angle, Power angle and Load angle are associated with Synchronous machines that are synchronous generator and synchronous motor. They named as Synchronous machines as they revolve… Read more »

Electrical Machines    Load Angle, Power Angle, Power Angle Curve, Synchronous Machine, Torque Angle
Ring Main Distribution Network with RMU

Ring Main Distribution with RMU:

Nowadays Ring Main units are widely used in Metro cities and smart cities for providing reliable supply to the consumers. It is essential for Electrical Engineers to know the working… Read more »

Power Systems    Load Break Switch, Ring Main Distribution, Ring Main Unit, RMU, RTU, SF6 Circuit Breaker
Line Differential Relay 87L Protection Scheme

Line Differential Relay [87L]:

The principle of operation of line differential protection is same as transformer differential protection. The only difference is transformer differential protection uses only one differential relay whereas line differential protection… Read more »

Numerical Relays    Cable Differential, Line Differential Relay [87L], Numerical Relay, Working principle
Numerical Under-Over Voltage Relay Configuration

Under voltage [27]/Over voltage [59] Relay:

In this post we can learn the working and configuration of Numerical Under voltage [27] /Over voltage [59] protection relay. These relays measure either phase to phase (Ph-Ph) or phase… Read more »

Numerical Relays    Numerical Relay, Over Voltage Protection [59], Under voltage Protection [27], Voltage Transformer Supervision (60VTS)
Core Balance Current Transformer with Three Core Cable

Core-Balance Current Transformer [CBCT]:

Core Balance Current Transformer-CBCT: Core-Balance Current Transformer CBCT also called as Zero Sequence CT. In this type of CT a single ring or rectangular shaped core of magnetic material, encircles… Read more »

Electrical Measurements    CBCT Motor Protection, CBCT Mounting, CBCT principle, CBCT Selection, Core Balance Current Transformer, Zero Sequence CT
Mounting of Potential Transformer in Circuit

Potential Transformer [PT]:

Potential or Voltage Transformer: The purpose of the Potential Transformer is to provide an isolated secondary voltage that is in-phase and exact proportionate representation of primary voltage. Potential Transformers are… Read more »

Electrical Measurements    Potential Transformer, PT-Broken Delta Connection, PT-Name Plate Specifications, PT-Open Delta Connection, PT-Practical Connection Scheme, PT-Star Connection, PT-Winding Connections, PT-Windings
Electrical Interview Questions

Electrical Interview Questions: Series-4

Electrical Interview Questions-Series-4 In this series of Interview questions we will learn about the major differences in Electrical Engineering. Major Differences in Electrical Engineering: 1. What are the major differences… Read more »

AE EXAM    Bus coupler vs Interconnecting Transformer, Derived Earth Fault, Differences, Electrical, Interview, Measured Earth Fault, Neutral VS Ground Potential, Questions, Transformer VS Induction Motor
Differential Protection Relay-87

Differential Protection Relay [87]:

Differential Protective Relay is a protective relay that functions on a percentage or phase angle or other quantitative difference of two currents. Differential relaying provides selectivity by providing a zone… Read more »

Numerical Relays    87 High Set, Bias Differential Relay, Bias Slope Curve, Differential Realy Settings, Inrush Detection, Numerical Relay, Overflux Detection, REF protection, SEF protection
Numerical Motor Protection Relay

Motor Protection Relays [50/51]:

Motor protection relays are used to provide various protections for the motors. These differ from the over current relays in terms of protections they offer. To understand the working of… Read more »

Numerical Relays    LED Configuration, Load Jam, Motor Protection, Negative Phase Sequence, No. of Starts, Numerical Relay, Protection Funtions
Trip time formulae for Over Current Relay-50/51

Over current/Earth fault Relays [50/51]:

Over current/Earth fault relays are the basic protection relays. Used for protection of transformers and feeders from over current and earth faults. When excessive current flows in a circuit, it… Read more »

Numerical Relays    Configuration, Disk Emulation, Dropout Time, Numerical Relay, Over Current Relays, Relay Time Characteristics, Trip Time

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