What is the disadvantage of large exciting current in a transformer?
What is Exciting current? The exciting current in the transformer produces the magnetic flux in the core. When energizing transformer at no load, transformer draws
Machines
An electrical machine converts mechanical energy into electrical energy or vice versa. The transformer is also an electrical machine which transform the voltage without changing the frequency. We will discuss about the;
- DC Motor
- DC generator
- Induction Motor
- Transformer
- Electrical drives
- Alternator or synchronous generator
Difference between no load, exciting, and leakage current in transformer
The no-load current of a transformer is the vector sum of the exciting current and core loss current of the transformer. Why Losses in a
Why can’t an Induction Motor run at synchronous speed?
The induction motor can’t run at synchronous speed because it is not possible to run the motor without load. Even the motor is at no
What is the slip value of a 3-phase induction motor at synchronous speed and starting speed?
When the stator of the induction motor is fed three phase supply, the synchronous rotating field is generated. The flux generated in the stator gets
Change of Resistance in Wires by Stretching
We shall understand with an example how the resistance of a wire changes with stretching its length. Example-1 –Change of Electrical Resistance with wire stretching
What is the difference between 0.2 and 0.2S class CT?
The metering class current transformer is used for metering the energy for revenue purposes. Therefore, the metering class current transformer must be as accurate as
Controlling Multiple Motors with one VFD
In many applications, we use a single VFD for multiple motors. In this method, more than one motor is connected to a single VFD drive.
Accuracy Limit Factor of Current Transformer
Definition- The accuracy limit factor (ALF) of a current transformer (CT) is a parameter that indicates the highest multiple of the rated current at which
Why can a 50Hz CT work on 60Hz systems, and why can’t a 60Hz C.T. work on a 50 Hz system?
CT or PT functions on the principle of electromagnetic induction. The electrical energy is first converted into magnetic energy and again the magnetic energy is
What is the Insulation Class of Transformer oil?
We first discuss what it means by insulation class and what is its importance. The insulating material is classified according to the maximum temperature which