Calculation For Voltage Regulation
The voltage regulation up is expressed mathematically by Positive sign is for lagging power factor and negative sign is for leading power…
Concentric Windings In Transformer
Figure 1.10 Concentric Windings Concentric windings are classified into four following groups: (i) Spiral windings. (ii) Helical windings. (iii) Cross-over windings. (iv) Continuous…
Conservator And Breather
Satisfactory operation of a transformer solely depends on the condition of the oil. It is required to keep the oil clean and…
Construction Of Single-Phase Transformer
Magnetic core and windings (or coils) are the two basic parts of any transformer. The core is made of silicon or sheet…
Per Unit Resistance, Leakage Reactance And Impedance Voltage Drop
Full-load voltage of a transformer can be expressed as a fraction of the full-load terminal voltage. Let I1fl be the full-load primary current, I2fl be the…
Polarity Test Of A Single-Phase Transformer
Polarity testing of transformers is vital before connecting them in parallel. Otherwise, with incorrect polarity, it is not possible to connect them…
Sandwich Windings In Transformer
Figure 1.15 shows sandwich windings used in shell-type transformers. The high-voltage and low-voltage windings are split into a number of sections where…
Shell Type Transformer
Shell-type transformer has double magnetic circuit and three limbs. Both windings are placed on the central limb. The coils occupy the entire…
Separation Of Core (Or Iron) Losses In A Transformer
Hysteresis loss and eddy current loss are the components of the iron losses. For the applied fl ux density Bmax to the core, we…
Short Circuit Or Impedance Test
The main purpose of this test is to compute the following: Equivalent impedance of the transformer referred to primary and secondary. Cu…