Electric Portal is about electrical concepts and other electrical machines like motor transformer,dol starter,star delta starter,auto transformer starter and much more
The vector group of transformer shows the phase difference between the primary and secondary sides of the transformer. There are different ways in which transformer high voltage and low voltage winding is connected. Based on HV and LV winding connections, the vector grouping of the transformer is classified. The three-phase transformers are divided into four […]
The efficiency and regulation of the transformer can be calculated using open circuit and short circuit test on the transformer but to measure temperature rise during operation, it is necessary to conduct a full load test on the transformer. for low power small transformers, a full load test can be performed directly by loading. but […]
What Is Buchholz Relay? Buchholz relay is a mechanically operated relay that is used to protect the transformer from internal faults that occur inside the transformer tank like an inter-turn fault. Buchholz relay is an oil and gas-operated device. The function of this relay to give an alarm in case of an incipient fault in the […]
The dielectric strength of transformer oil is known as BDV or break-down voltage. A Transformer Oil BDV test is performed to find the dielectric strength of transformer oil. BDV is the minimum voltage withstand the capacity of transformer oil without breakdown. BDV test of transformer oil is very important because the transformer oil’s main function […]
A vacuum circuit breaker (VCB) is an electrical switch designed to interrupt an electric current in a vacuum medium. It uses the principle of vacuum arc extinction to extinguish the arc generated during the circuit breaking process. VCBs find applications in various industries and power distribution networks due to their numerous advantages over other types […]
Synchronous motors play a crucial role in various industries, although their usage is relatively limited compared to induction motors. While induction motors are widely used because of their cheap prices, rugged construction, and low maintenance, synchronous motors offer unique advantages that make them valuable in certain applications. However, they also come with their own set […]
An induction generator is also called an asynchronous generator. An induction machine can work as a generator. For working as a generator initially, the three-phase induction motor is started as a motor. During motoring operation, it draws reactive volt-amperes from the main supply then the speed of the machine is increased above the synchronous speed […]
This bridge was first introduced by Wheatstone for measuring the value of unknown resistance. Wheatstone bridge circuit consists of four resistors, two with known resistances P & Q and one known variable resistance R, and one unknown resistor X whose value is to be calculated. All four resistors are connected in a manner to form a […]
Consider an AC voltage of magnitude “V” having frequency “f” is applied to the primary side of the transformer. ac flux Φm is set up in the transformer core, this flux links with the both primary and secondary winding of the transformer. the value of induced emf can be calculated using EMF equation of the transformer, also […]
Why single-phase induction motor is not self-starting? Single-phase induction motor Starting winding to make self starting A single phase induction motor is very similar to a three phase squirrel cage induction motor except for single-phase motor, not self-starting.It has (i) a squirrel-cage rotor as to a 3-phase motor and (ii) a single-phase winding on the stator Unlike a 3-phase induction motor, a […]
