## Basic Criteria for Selection of 33 kV/ 11 kV Or 66kV/11kV Substation

Basically 33 kV / 11 kV is used for distribution of power at the substation and 66 kV / 11 kV is also used for the distribution. But whether to use 66/11 kV or 33/11 kV depends on many factors. Following are some of the factors which are taken care for the selection of voltage … Read more

Harmonic voltages and currents in a Power System are a result of non-linear electric loads. In a normal AC Power System, the current varies sinusoidally at a specific frequency, usually 50 or 60 Hertz. When a linear electrical load is connected to the system, it draws a sinusoidal current at the same frequency as the voltage, … Read more

## Dynamic Braking and Plugging

Dynamic Braking: Apart from Regenerative Braking, another method of reversing the direction of torque and Braking the motor is dynamic braking. In this method of braking the motor which is at a running condition is disconnected from the source and connected across a resistance. When the motor is disconnected from the source, the rotor keeps … Read more

## Regenerative Braking

In the last post “Need for Electrical Braking in Electrical Drives“, we discussed the various reasons which call for Electric Braking. Brakes are used to reduce or cease the speed of motors. Braking of Motor can be classified into three types: Regenerative Braking. Plugging type Braking. Dynamic Braking. In this post we will focus on … Read more

## Need for Electrical Braking in Electrical Drives

There are two types of Braking: i)     Mechanical Braking and  ii)     Electrical Braking. In Mechanical Braking the speed of the machine is reduced solely by mechanical process but Electrical Braking is far more interesting than that because the whole process is depended on the current and torque directions. We can say that it is the process … Read more

## What will happen if DC Motor run at a Higher RPM than the Rated RPM?

This may come in our mind that what exactly will happen if we operate a DC Motor at a speed more than the rated speed. In fact, the thermal capacity of the motor decides at what speed it can run and for how long. There is always a safety factor considered in the design which … Read more

## Updated GATE 2019 Syllabus – Electrical Engineering

As all of us know that these days all PSUs recruit as per the GATE rank so it is very important to secure a good rank in GATE Exam. I will strongly recommend to study with a proper strategy to have a great rank. I will soon post on how to make your strategy for … Read more

## How Electrical Circuit Ground in an Aeroplane?

In an Aeroplane, it is only a single wire wiring which carries positive charge to all the systems and electrical units. The Aeroplane body functions as the negative path. This is why all parts of an Aeroplane are always connected with electrical bonding strips. This keeps the complete Aeroplane in a uniform level of charge … Read more

## What Happens if the Prime Mover of Synchronous Generator Fails?

If we take a Thermal Power Plant, then steam Turbine serves the purpose of prime mover and coupled with Synchronous Generator. Now if the steam supply to the steam turbine is suddenly cut off while the Synchronous Generator is connected to Grid, what will happen?     The answer is simple. If all the Generator … Read more

## Difference between Transducer and Sensor

Sensor: As the name suggests, it is a device which reacts to a physical, chemical or biological condition. It senses a change in physical, chemical or biological condition. It can be considered as a detector. A Sensor can sense in any form usually electronic i.e. due to some mechanical change, it can react in electrical … Read more