Measurement of Insulation Resistance
What is Insulation Resistance Test or IR Test? The Insulation Resistance Test measures the Insulation resistance of a device under test, while phase and neutral … Read more
How to Calculate NGR Resistance Value?
What is NGR? NGR-Neutral Grounding Resistance. NGR limits the ground fault current to the equipment’s safe operating current range to protect all the electrical equipment. … Read more
Transformer Basics & Its Working Principle
What is a Transformer? The transformer is a static device that transfers electrical energy from one circuit to another circuit without altering the frequency. The … Read more
Efficiency of Transformer
The transformer is a vital link between the load and the supply. The efficiency of the transformer is very important in view of energy saving. … Read more
EMF Equation of Transformer | Turns Ratio of Transformer
EMF equation of transformer is very important for understanding the working of the transformer. When a sinusoidal voltage is applied to the primary of the … Read more
Why Making Current of Circuit Breaker is More than Breaking Current?
What is the Making and Breaking Current of Circuit Breaker? The circuit breaker is used for switching the circuit on and off and also for … Read more
Rotating Magnetic Field in Three Phase Induction Motor
The stator of an induction motor consists of a number of overlapping windings offset by an electrical angle of 120°. When the primary winding or stator is … Read more
Application of Squirrel Cage And Slip Ring Induction Motor
There are two types of 3-phase induction motors. These are the squirrel cage induction motor & slip ring induction motor. We shall discuss the application … Read more
Why Induction Motor Takes High Starting Current?
Working Principle of Induction Motor: The induction motor draws a high starting current compared to the running condition. The starting current of the induction motor … Read more
Polarization Index Test and DAR Test
The polarization index test is a 10-minute to 1-minute ratio test of insulation resistance. Similarly, the DAR test is a 60-second to 30-second insulation resistance … Read more