Quiz: Three phase transformer A 3-phase,50HZ, 150 KVA, 2200/220 V transformer supplies a 3- phase load drawing 120 KVA and 90 KW lagging on the 220 V side. The transformer is made up of three single phase transformers connected Y/Y and having the following per phase values given: RH=0.42; XH-22; RL=4m2; XL=20m2; RCH=10k2; XmH =8k2. Determine: (a) The primary voltage. (b) Efficieney. (c) The voltage regulation of the transformer.

Two transformers are to be operated in parallel such that they share load in proportion to their KVA rating. The rating of the first transformer is 500 kVA and its pu leakage impedance is 0.05 pu. If the rating of second transformer is 250 kVA, then its pu leakage impedance is A 0.20 B 0.10 C 0.05 D 0.025

Three single phase transformers are connected in a Delta-Wye configuration.  Each transformer is rated 13kV/64kV.  The transformers are connected to a 3 phase 13kV (L-L) supply and the balanced three phase load is 788KVA. What is the current magnitude in the secondary winding of each transformer? explain the steps too please

Excercies: 1. Two transformers A and R to a load of (2+jh5) Their impedanas in secondary terms Coltjo.6)5r EA = 200 Lov output and Power factor of each transformer are Connected in parallel ZA = (o15t+j 0.8)2 and zR= Their noload termind nltages are and Es = 21010V Fnd the poer are %3D 11 2. Two trans formes A andB of ratings 500KVA and 25okVA supplying a load kVA of 750 at a8 Pf lagging. Their open circuit voltayes are 400V and 410V respecctively. Transformer A has 1% rsistance and 5/ reactance and transformer B hay s resistance and 4 reactance. Fnd (a) Cross-curnt in the seondaries load shared by each transforcmer. are on no-load,b) the 2.