Q)
(chatquestion)...A generation plant has a 12kV, balanced three-phase, wye connected synchronous generator. It
has two (2) pole pairs and is coupled to and driven by a gas turbine engine which maintains the
rotational speed of the rotor at 1500 rpm.
The output of the generator is connected to a 12kV/66kV delta-star composite three phase
transformer in the plant's substation. The transformer secondary windings then connect to three
transmission lines that leave the substation, each of which has a total resistance and inductance
of 102 and 95.5mH respectively.
The total number of customers supplied by the transformer is modelled as a balanced three phase
delta connected load at the end of the transmission lines with a resistance and inductance of
5002 and 1.5H respectively per phase.
a) State and explain the purpose of the transformer in this scenario.
(5 marks)
b) Draw a labelled diagram of the entire three phase system clearly showing all known
voltages (phase and line values) and the three phase configurations of all components.
(10 marks)
c) Assuming the transformer is ideal and lossless and that all neutrals are grounded,
calculate:
i) The line currents between the transformer and load
(12 marks)
ii) The phase currents in the delta load
(4 marks)
iii) The phase voltages of the delta load
(6 marks)
iv) The total apparent power supplied to the load
(3 marks)...(Can I get some help with this question please)
...
