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代写assignment:Post Unit Assignment

论文作者:留学生论文论文属性:作业 Assignment登出时间:2011-03-18编辑:anterran点击率:2277

论文字数:451论文编号:org201103180856426095语种:英语 English地区:英国价格:免费论文

附件:20110318085642649.pdf

关键词:Post Unit AssignmentAssignment代写

EEE8044 - Post Unit Assignment
Figure 1 shows an isolated three-phase load supplied from a 33 kV/11 kV substation via a30 km long three-phase 11 kV overhead line. The overhead line has the following seriesparameters:
Series inductive reactance = 0.28 Ω/km/phase
Series resistance = 0.22 Ω/km/phase
Line capacitance and shunt leakage effects may be neglected.
The line supplies a small industrial site fed from a 600 KVA, 11 kV/415 V delta/startransformer with an impedance of 6% (calculated on transformer rating) and negligibleresistance. The transformer secondary is earthed via a 1Ω earthing resistor.
The site has a load of 450 kVA at a power factor of 0.7 lagging. The voltage at the 33kV busat the substation is maintained at 33.1kV and the 33kV fault level at the substation is 2000
MVA.
Section A
Calculate the voltage at the LV load bus (Vr), the substation power and reactive power flowsand the power loss in the 11kV transmission line.
Calculate the site fault level at the 415 V side of the transformer.
Section B
Calculate the magnitude of the fault current at the transformer secondary terminals for the
following types of fault:
(i) phase-to-earth fault
(ii) phase-to-phase fault
(iii) phase-to-phase to earth fault
Section C
The site 450 kVA load is actually a three-phase, six pulse thyristor rectifier feeding a dc bus.
Assuming that the voltage waveform at the site 11 kV bus is purely sinusoidal, calculate the
Total Harmonic Distortion (THD) at the 415 V point of common coupling. Is this level of
harmonic distortion acceptable?
The site engineer has decided that a 75 kVA three-phase power factor correction capacitor
bank should be connected across the incoming ac supply to improve the sites’ power factor
and to support the local voltage level.
Calculate the Total Harmonic Distortion at the 415 V point of common coupling for this new
circuit arrangement.
Is this new level of harmonic distortion acceptable? If not, give a brief view on how might
you go about solving the problem?
Substation
Vs= 33.1kV
11kV transmission Line
Vr
load bus
33kV/11kV
5 MVA transformer
X=0.05 pu
on rating
11kV/415V
0.6MVA transformer
X=0.06 pu
on rating
Load
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