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?
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?
Buchholz relay is a gas actuated protection relay which is generally used in large oil immersed transformers of rating more than 500 kVA. It is used for the protection of a Transformer from the faults occurring inside the transformer. A typical Buchhloz Relay is shown below. The gas actuated protective relay is designed to … Read more Buchholz Relay – Construction and Working Principle
For the purpose of quality assurance and ensuring that the finished transformer conforms to customer requirements and is ready for service a barrage of tests are performed on the transformer. These can be broadly classified into the following 3 types: Routine Test, Type Test and Special Test. 1) Routine Tests: These are standard tests performed … Read more Transformer Testing
Brushes are used in two main types of motors: DC motors and large synchronous motors, called wound-rotor synchronous motors. There is a third case in which brushes was used, the wound-rotor induction motor that has been obsolete for many years. In the DC motor case, the brushes transfer current into the rotor via the commutator. … Read more Difference between Brushed and Brushless Motor
A Stepper Motor is a special form of AC Motor. The input of this motor is in the form of electric pulse. For each input pulse,motor shaft turns through a specified degree, called Step. The Step size may vary from 0.72° to 90°. This means that motor shaft may turn from 0.72° to 90° for … Read more Basics of Stepper Motor
BDV test means Breakdown Voltage Test. It is done for checking the dielectric strength of the oil of the Transformer. Dielectric strength means the maximum capacity to withstand voltage of insulating oil. This test shows the dielectric strength of Transformer oil. In transformer oil has mainly two purposes, first for insulation, second as cooling of … Read more BDV Test in Transformer
As we know that, the configuration of Armature and Field Winding is reverse in Synchronous Machine compared to DC machine i.e. Armature is on stator and field winding is on rotor unlike DC machine where it is opposite. In alternator the rotor part constitutes field winding so if we give DC supply to field winding … Read more What happens if AC Supply is given as Field Excitation to Synchronous Machine?