Polarization Index(PI) Test and DA Test
The Polarization Index (PI) and Dielectric Absorption Ratio (DAR) tests are essential diagnostic tools for assessing insulation health in transformers and motors. The polarization index
Electrical
Effect of Fan Regulator on Power Consumption
The effect of fan regulator on power consumption is an important consideration when aiming to save electricity at home. Many people wonder, “Does a fan
How to Calculate Burden of CT
The burden of the current transformer is expressed in VA. The total VA burden should be considered when CT is used for measuring or protection
Back EMF in DC Motor – Definition, Formula & Significance
The back EMF momentarily opposes the armature voltage when the speed of the DC motor is changed, and thus, it limits the armature current. Definition
Transformer Over Fluxing Protection
Transformer Over Fluxing Protection protects the core from overheating caused by over-fluxing. The voltage and frequency ratio (V/f) is responsible for over-fluxing in the transformer.
Over Fluxing in Transformer: Causes, Effects, and Permissible Flux Limits
Overfluxing in transformer is a critical condition that occurs when the voltage-to-frequency ratio (V/f) exceeds its designed limit, leading to an abnormal rise in core
Why DC Series Motor should not be Started at No Load
The DC series motor attains dangerously high speed when we run it on no load. The main reason for overspeeding is that at no load,
Why is Star Delta Starter Preferred with an Induction Motor?
Why star delta starter is preferred with induction motor can be understood from the following explanation. In star delta starting, the phase voltage is 58%
DC Shunt Motor : Construction, Speed Control & Characteristics
A DC shunt motor is known for its nearly constant speed operation, making it ideal for applications like lathes, fans, and conveyors. In this post,
Why Are Rotor Bars Skewed in An Induction Motor?
What is Skewing of Rotor Slots? As shown in the above picture, the rotor bars of an induction motor are not parallel with the shaft,