## Why is Load Angle of Alternator Kept 20°-30°?

As we know that Power Output of an Alternator, P = EfVtSinδ/Xs   Where Ef = No Load Voltage   Vt = Terminal Voltage of Alternator   δ = Load Angle   Xs = Synchronous Reactance Thus it is clear that power output of an...

## Parallel Resonance Circuit – A Rejecter Circuit

What is Parallel Resonance Circuit? Parallel resonant circuit is a generic term which consists of resistor, inductor as well as a capacitor in parallel connection. A parallel circuit containing a resistance, R, an inductance, L and a capacitance, C will produce a parallel resonance circuit...

## Speed Control of BLDC Motor

Speed control of BLDC motor is essential for making the motor work at desired rate. Speed of a brushless dc motor can be controlled by controlling the input dc voltage / current. The higher the voltage more is the speed. Many different control algorithms have...

## Brushless DC (BLDC) Motor

What is a Brushless DC or BLDC Motor? A Brushless DC Motor, BLDC accomplishes commutation electronically using rotor position feedback to determine when to switch the current. The BLDC motor is electrically commutated by power switches instead of brushes. The structure of Brushless DC Motor,...

## Why Harmonic Current in Transformer Excitation Current?

Harmonics in the excitation current of Transformer is due to Hysteresis. As we know the relationship between Magnetic Flux Density, B and Magnetic Field Intensity, H is not linear as shown in figure below. Also, B = Flux (Ø) / Area (A), and H =...

## Edge Triggering and Level Triggering

Triggering basically means switching. The way in which a switch or an event is triggered can be different, based on the user’s requirements. Edge and Level Triggering, are both common terms when using sequential circuits like Flip Flops triggered by a clock signal. Essentially, this...

## HVDC Circuit Breaker – Brief Description

In AC circuit breakers/ arc extinction is achieved at the natural current zero of the AC waveform used. But in DC circuit breakers / natural zero of voltage and current is not available as both are continuously available. Thus for extinction of an arc, artificial...

## Difference between Isolation and Pulse Transformer

Isolation Transformer: An isolation transformer is a Transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons. Isolation Transformers provide galvanic isolation and...