Q2. Consider the single-phase transformer circuit shown below. Transformer ratings and reactances are: Transformer A : 200 kVA, 250 / 750 V , X= 0.10 p.u. : 100 kVA , 900 / 300 V , X = 0.15 p.u. Transformer B The transmission line can be represented as a series impedance Zine = 0.4 + j 0.6 Q. Choose a base of 200 kVA, 250 V in the voltage source ( V, ) circuit. (a) Draw the impedance diagram for this circuit, with all impedances in per unit. (b) Find the load voltage in per unit and in volts when the source voltage is V.=120° pu. (c) Find the transmission line current (IL) in amperes. transmission line A (Zi-0.4 + j0.6 N) В "line V Z=0.5 + j0.2 N Lee Lee

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Q2. Consider the single-phase transformer circuit shown below. Transformer ratings and reactances are:
Transformer A : 200 kVA, 250 / 750 V , X= 0.10 p.u.
Transformer B : 100 kVA , 900 / 300 V , X= 0.15 p.u.
The transmission line can be represented as a series impedance Zine = 0.4 + j 0.6 Q.
Choose a base of 200 kVA, 250 V in the voltage source ( V, ) circuit.
(a) Draw the impedance diagram for this circuit, with all impedances in per unit.
(b) Find the load voltage in per unit and in volts when the source voltage is V.=120° pu.
(c) Find the transmission line current (IL) in amperes.
transmission line
A
(Zime=0.4 + j0.6 N)
ʼline
B
Z,=0.5 + j0.2 Q
Q3. A 30 line is 100 km transmission line is delivering 100MW, 0.8 p.f. lag at 132kV. Each conductor has a
resistance of 0.2 /km, reactance 0.5 O/km and admittance 5x10“mho/km.
If the load is balanced and leakage is neglected, calculate the sending end voltage, sending end power factor,
efficiency, regulation of the transmission line using nominal “IT" (pi) model.
Leeee
eele
lell
Transcribed Image Text:Q2. Consider the single-phase transformer circuit shown below. Transformer ratings and reactances are: Transformer A : 200 kVA, 250 / 750 V , X= 0.10 p.u. Transformer B : 100 kVA , 900 / 300 V , X= 0.15 p.u. The transmission line can be represented as a series impedance Zine = 0.4 + j 0.6 Q. Choose a base of 200 kVA, 250 V in the voltage source ( V, ) circuit. (a) Draw the impedance diagram for this circuit, with all impedances in per unit. (b) Find the load voltage in per unit and in volts when the source voltage is V.=120° pu. (c) Find the transmission line current (IL) in amperes. transmission line A (Zime=0.4 + j0.6 N) ʼline B Z,=0.5 + j0.2 Q Q3. A 30 line is 100 km transmission line is delivering 100MW, 0.8 p.f. lag at 132kV. Each conductor has a resistance of 0.2 /km, reactance 0.5 O/km and admittance 5x10“mho/km. If the load is balanced and leakage is neglected, calculate the sending end voltage, sending end power factor, efficiency, regulation of the transmission line using nominal “IT" (pi) model. Leeee eele lell
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