For a Yd1 transformer:
(a) draw the connection diagram
(b) show how the connections must be modified to allow parallel operation with a Yd11 transformer
(c) draw a phasor diagram for the modified connection.
In your own words, state the three essential and two highly desirable conditions which must be fulfilled for two 3-phase transformers to operate satisfactorily in parallel.
State briefly what you think may be the possible consequences of not complying with these conditions.
(a) Two single-phase transformers have the following impedances referred to the secondary side.
Unit A rated 250 kVA (0.09 + j2.7) O Unit B rated 400 kVA (0.04 + j1.6) O
Determine the load taken by each machine as a percentage of its rating when they share a common load of 500 kVA at 0.73 p.f. lag.
(b) Transformer A is rated at 300 kVA with an impedance of (0.09 + j0.18) O
Transformer B is rated at 200 kVA with an impedance of (0.09 + j0.23) O
If these transformers are connected in parallel to supply a common load, determine the percentage overload on B when A supplies its full load at p.f. 0.45 lag.
4. From the operating chart shown determine the following performance limitations for a generator:
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