Electrical Engineering ⇒ Topic : Approximate Voltage Drop in a Transformer

Maninder
 
APPROXIMATE VOLTAGE DROP IN A TRANSFORMER During noload condition, V_{1} is approximately equal to E_{l} and 0V_{2 }= E_{2 }where 0V_{2} indicates noload terminal voltage of the secondary. 0V_{2} is also equal to E_{1}/a, i.e., equal to Vita. When secondary is loaded, let the secondary terminal voltage be V_{2}. The difference between V_{2} and 0V_{2} is the voltage drop across equivalent impedance in secondary, i.e., /_{2}Z_{e2} shown in Figure (a).
Figure (a) Phasor diagram of a transformer referred to secondary In Figure (a), R_{e2} and X_{e2} are the equivalent resistance and reactance, respectively referred tosecondary side. With 0 as centre, an arc is drawn in Figure (a) which intersects the extended OA at H. From C, a perpendicular is drawn on OH which interests it at G. Now, AC = AH represents the actual drop and AG represents the approximate voltage drop. BF is drawn perpendicular to OH from B. BE is drawn parallel to AG. The approximate voltage drop is written as ................. (1) ................. (2) ................. (3)  
 
!! OOPS Login [Click here] is required for more results / answer