What is Peak Value, Average Value and RMS Value?
Peak Value The sinusoidal waveform starts from zero, attains peak value, and again comes down to zero in a positive half cycle. In the next
Why Insulated Bearing is used for VFD driven Motor?
The insulated bearing for the motor is used to prevent the circulating current through the motor bearing. The circulating bearing current can damage the bearing.
Dispersion Coefficient of Induction Motor
The power factor and dispersion coefficient of an induction motor have a relationship. The smaller the dispersion coefficient, the better the power factor. Power factor
Why is Power Factor of Transformer is Poor at no Load?
The transformer draws no load current from the supply source when its secondary is open circuit. The no-load current has two components: magnetization current(Im) and
Why an Induction Motor is almost constant Speed Motor?
At no load the speed is closest to its synchronous speed. This running speed reduces further when loaded towards its full load capacity, to about 5% for a moderately rated machine tojust more than 5% for smaller rated machine.
Instrument Safety Factor of Current Transformer
The current transformer is used for measuring the current. The specifications of the measuring class CT are given below. The Instrument Safety Factor (ISF) is a
Condition for Maximum Power of DC Motor
The DC motor is most suitable for loads that demand a higher starting torque. When DC voltage is applied to the armature, the motor is
Difference between AC and DC Relay
What is a relay Coil? The relay coil has many turns of copper wire wound around a bobbin in which the iron core is situated.
Windage losses in Electric Machines
Windage is the name usually given to air resistance inside rotating electrical machines like generators or motors. Windage losses also occur in machines such as turbines and gearboxes. When
What is meaning of 5P20 in current transformer?
There are three types of current transformers which are used for various applications. 1. Metering Purpose2. Protection Purpose3. Special Protection Purpose The particular class of