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 What Happens if the Prime Mover of Synchronous Generator Fails?
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 Difference between Transducer and Sensor
As discussed in the previous post Blocked Rotor Test of Induction Motor, the rotor is prevented from rotating and then a small voltage is applied to the stator sufficient to pass the rated current through the stator winding and then leakage impedance of Induction Motor is calculated. The question may arise that why don’t we … Read more Why not Blocked Rotor Test by Keeping Induction Motor Rotor Winding Open?
As the name of the test specifies, in Blocked Rotor Test, rotor of Induction Motor is blocked by external means so that it cannot rotate. The Blocked Rotor Test of Induction Motor is similar to the short circuit test of a transformer. As in Transformer short circuit test, we apply a voltage which can circulate … Read more Blocked Rotor Test of Induction Motor
The main purpose of any starter is to reduce the requirement of high starting current. Normally the starting current of an induction motor is 6 to 7 times of the full load current. If one has an induction motor with a DOL starter, drawing a high current from the line, which is higher than the … Read more Why Star Delta Starter Preferred in Induction Motor?
What is Differential Protection? Differential Protection is based on the fact that any fault within electrical equipment will result into the difference in current entering it and the current leaving it. Thus by comparing the two currents either in magnitude or in phase or both we can determine a fault and issue a trip decision … Read more Transformer Differential Protection
What is Auto Reclosure? Autoreclosing is a feature which is provided in the Line Circuit Breaker so that Single Pole of a Breaker may trip and close when command is given to do so. Based on the time duration of fault existing in the Power System, faults can be classified into three categories as Transient … Read more Autoreclosing Philosophy in Distance Protection
A tunnel diode is a diode that exhibits a negative differential impedance region in its I-V characteristic due to quantum tunneling effects. That is, a -sloped region as shown by red colored region in the figure below. It’s a diode, a kind of semiconductor device usually with two terminals. Unlike a regular pn diode, Tunnel … Read more What is Tunnel Diode?
For understanding the concept of Infinite Bus, we will take some examples. Suppose we take an isolated synchronous generator of capacity 100 kW and supplying a load of, say 50 kW, at 50 Hz and rated voltage, say 400 V. Now if we add a load of 20 kW what will happen? The frequency (speed) … Read more Concept of Infinite Bus
This is a famous question which most of the people ask to an Electrical Engineer that “Suppose we are setting up a power plant so shall we use HVDC or HVAC Transmission?” In this post I am going to answer this question with examples which will help to clear the concept. We have already seen … Read more Deciding Factor for Selection of HVDC over HVAC Transmission