Current inrush phenomenon in transformer is the flow of high magnetizing current for short time in primary winding when the transformer is switched ON at the instant when applied voltage is zero.
What is Transformer Inrush Current? Waveform, Nature & Problems Read More »
Figure 1: Sumpner’s Test (Back to Back Test) of Transformer. Sumpner’s test is the improved method of determining the regulation, efficiency and heating on load conditions than O.C and S.C tests. This test requires two similar transformers, which can be connected to the supply in such a way that one is loaded on other. The
Sumpner’s Test (Back to Back Test) of Transformer Read More »
Depending upon the type of core used there are two types of transformers in practice. They are, Core type transformer Shell type transformer. Core Type Transformer Figure 1: Core Type Transformer.
Difference Between Core Type and Shell Type Transformer Read More »
Figure 1: Star-Star or (Y-Y) Connection. Fig. 1 shows a star-star connection of primary and secondary windings.
What is Star-Star or (Y-Y) Connection of Three Phase Transformer? Read More »
A constant voltage transformer (CVT) works on ferro-resonant principle. The variation in the primary flux with an unsaturated iron core does not affect the secondary flux with saturated iron core. Thus, the secondary induced voltage remains relatively independent of the voltage impressed upon the primary winding. Fig. 1: Constant Voltage Transformer (CVT).
What is Constant Voltage Transformer (CVT)? Working Principle, Diagram & Applications Read More »
Transformer, being a stationary electrical equipment, does not have rotational or windage losses. The losses which occur in a transformer are, Copper losses Iron or core losses.
Losses in Transformer – Copper, Iron, Hysteresis & Eddy Current Losses Read More »
The potential transformer is another type of instrumentation transformer. It is used to measure high ac voltages. The construction of a Potential Transformer (P.T.) is same as that of the normal transformer. Fig. 1 : Connection of Potential Transformer (PT) to measure voltage.
What is a Potential Transformer (PT)? Working Principle, Diagram, & Disadvantage Read More »