A simple 3 phase 2 port symmetrical π network has a series impedance of 10∠30⁰, and...
A simple 3 phase 2 port symmetrical π network has a
series impedance of 10∠30⁰, and each shunt admittance 2∠30⁰ mS. The
network has an output load of 50MW at 66kV with 0.9 lagging power
factor.
Given that , calculate:
a) The ABCD parameters
b) The voltage, current and power factor at supply side
Homework Answers
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A simple 3 phase 2 port symmetrical π network has a
series impedance of 10∠30⁰, and...
Q2. Draw the nominal π circuit that is used to represent the medium-length transmission line model with total series impedance Z and total shunt admittance Y. Then derive the equations to express the...
Q2. Draw the nominal π circuit that is used to represent the medium-length transmission line model with total series impedance Z and total shunt admittance Y. Then derive the equations to express the ABCD parameters (a) 20% (b)A 200 km, 230 kV, 50 Hz three-phase overhead transmission line has a positive-sequence series impedance z (0.08 + j0.48) Ω/km, and a positive-sequence shunt admittance y-j3.33 x 10T° S/km. At full load, the line delivers 250 MW at 0.99 power factor lagging...
4. A 500 km, 500kV,60 Hz three-phase transmission line has a positive sequence series impedance z...
4. A 500 km, 500kV,60 Hz three-phase transmission line has a positive sequence series impedance z =j 0.38.2/km and a shunt admittance y =j 4.0 x 10-6S/km. Line losses are neglected. a. Calculate the line's characteristic impedance Zc, the propagation constant y and the exact ABCD parameters of the line... b. Calculate the surge impedance loading (SIL) in MW and the maximum power that the line can deliver at rated voltage C. At full load the line delivers 1000 M...
A three-phase transmission line is 200 km long. lt has a total series impedance of 25+j110)Ω...
A three-phase transmission line is 200 km long. lt has a total series impedance of 25+j110)Ω Per Phase and a total shunt admittance ofj5x 10 Ω. It delivers 180 MW at 275 kV and 0.8 power factor lagging to a load connected at the receiving end. Using the medium π model of the line, determine the voltage, current, real power, reactive power and power factor at the sending end of the line.
Q1. A 30-km, 34.5kV, 50Hz, three-phase line has a positive-sequence series impedance Z-0.19+j0.34 2/km. The load...
Q1. A 30-km, 34.5kV, 50Hz, three-phase line has a positive-sequence series impedance Z-0.19+j0.34 2/km. The load at the receiving end absorbs 1OMVA at 33kV. Assuming a short line, calculate: a) the ABCD parameters b) sending-end voltage for a load power factor of 0.9 lagging c) sending-end voltage for a load power factor of 0.9 leading Ans: (a) A-D-1.00 pu. B-11.685<60.8°, C-0.0 mho, (b) V,-35.96 kVLL, (c) V,-33.39 kVLL
Question #4 A 60-Hz, three-phase, transmission line is 210 km long. It has a total series...
Question #4 A 60-Hz, three-phase, transmission line is 210 km long. It has a total series impedance of (0.06 +0.053) 2/km and a shunt admittance of j5.6 x 10-6 S/km. The supply provides 200MW (P) at 275kV (line voltage i.e. Vs), with 0.9 power-factor lagging (i.e. pfs). Using the nominal-T approximation, (i) ABCD parameters (ii) Receiving end voltage and current (iii) Receiving end power and power factor; (iv) Line voltage regulation (v) line efficiency (vi) Propagation constant (vii) Attenuation constant
A 230-kV, three-phase transmission line has a per phase series impedance of z = 0.05j0.45 2...
A 230-kV, three-phase transmission line has a per phase series impedance of z = 0.05j0.45 2 per km and a per phase shunt admittance ofy = j3.4 x 10-6 siemens per km. The line is 80 km long. Using the nominal r model, determine (a) The transmission line ABCD constants. Find the sending end voltage and current, voltage regulation, the sending end power and the transmission efficiency when the line delivers (b) 200 MVA, 0.8 lagging power factor at 220...
A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence series impedance ?=0.08+?0.48 Ω/km and a positive-sequence...
A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence
series impedance ?=0.08+?0.48 Ω/km and a positive-sequence shunt
admittance ?=?3.33×10−6 S/km. At full load, the line delivers 250
MW at 0.99 pf lagging and at 220 kV. Using the nominal ? circuit,
calculate:
a. The ABCD parameters,
b. The sending-end voltage and current,
c. The percent voltage regulation.
A three phase 765kV, 60Hz, 250km line has the following positive sequence series impedance and shunt...
A three phase 765kV, 60Hz, 250km line has the following positive sequence series impedance and shunt admittance: ? = 0.0165 + ?0.3306 Ω/km and ? = ?4.674 × 10−6 S/km. Calculate ABCD parameters in a nominal Π circuit.
A 230kV three phase transmission line has a per phase series impedance of z=0.05+j0.45ohms per km...
A 230kV three phase transmission line has a per phase series impedance of z=0.05+j0.45ohms per km and a per phase shunt admittance of y= j3.4x10^-6 siemens per km. The line is 80km long. Using the medium line pi model: (a) Determine the transmission line model constants A, B, C, and D (b) Find the sending end (generating) voltage, current and power when the line delivers to a load of 1. 200 MVA with 0.8 lagging power factor at 220 kV...
Question #4 A 60Hz, threephase, transmission line is 210 km long. It has a total series...
Question #4 A 60Hz, threephase, transmission line is 210 km long. It has a total series impedance of (0.06 +0.053) S2/km and a shunt admittance of j5.6 x 100 S/km. The supply provides 200MW (P) at 275kV (line voltage i.e. V.), with 0.9 powerfactor lagging (i.e. pf). Using the nominalT approximation, (1) ABCD parameters (ii) Receiving end voltage and current (iii) Receiving end power and power factor; (iv) Line voltage regulation (v) line efficiency (vi) Propagation constant (vii) Attenuation constant
Q2. Draw the nominal π circuit that is used to represent the medium-length transmission line model with total series impedance Z and total shunt admittance Y. Then derive the equations to express the ABCD parameters (a) 20% (b)A 200 km, 230 kV, 50 Hz three-phase overhead transmission line has a positive-sequence series impedance z (0.08 + j0.48) Ω/km, and a positive-sequence shunt admittance y-j3.33 x 10T° S/km. At full load, the line delivers 250 MW at 0.99 power factor lagging...
4. A 500 km, 500kV,60 Hz three-phase transmission line has a positive sequence series impedance z =j 0.38.2/km and a shunt admittance y =j 4.0 x 10-6S/km. Line losses are neglected. a. Calculate the line's characteristic impedance Zc, the propagation constant y and the exact ABCD parameters of the line... b. Calculate the surge impedance loading (SIL) in MW and the maximum power that the line can deliver at rated voltage C. At full load the line delivers 1000 M...
A three-phase transmission line is 200 km long. lt has a total series impedance of 25+j110)Ω Per Phase and a total shunt admittance ofj5x 10 Ω. It delivers 180 MW at 275 kV and 0.8 power factor lagging to a load connected at the receiving end. Using the medium π model of the line, determine the voltage, current, real power, reactive power and power factor at the sending end of the line.
Q1. A 30-km, 34.5kV, 50Hz, three-phase line has a positive-sequence series impedance Z-0.19+j0.34 2/km. The load at the receiving end absorbs 1OMVA at 33kV. Assuming a short line, calculate: a) the ABCD parameters b) sending-end voltage for a load power factor of 0.9 lagging c) sending-end voltage for a load power factor of 0.9 leading Ans: (a) A-D-1.00 pu. B-11.685<60.8°, C-0.0 mho, (b) V,-35.96 kVLL, (c) V,-33.39 kVLL
Question #4 A 60-Hz, three-phase, transmission line is 210 km long. It has a total series impedance of (0.06 +0.053) 2/km and a shunt admittance of j5.6 x 10-6 S/km. The supply provides 200MW (P) at 275kV (line voltage i.e. Vs), with 0.9 power-factor lagging (i.e. pfs). Using the nominal-T approximation, (i) ABCD parameters (ii) Receiving end voltage and current (iii) Receiving end power and power factor; (iv) Line voltage regulation (v) line efficiency (vi) Propagation constant (vii) Attenuation constant
A 230-kV, three-phase transmission line has a per phase series impedance of z = 0.05j0.45 2 per km and a per phase shunt admittance ofy = j3.4 x 10-6 siemens per km. The line is 80 km long. Using the nominal r model, determine (a) The transmission line ABCD constants. Find the sending end voltage and current, voltage regulation, the sending end power and the transmission efficiency when the line delivers (b) 200 MVA, 0.8 lagging power factor at 220...
A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence
series impedance ?=0.08+?0.48 Ω/km and a positive-sequence shunt
admittance ?=?3.33×10−6 S/km. At full load, the line delivers 250
MW at 0.99 pf lagging and at 220 kV. Using the nominal ? circuit,
calculate:
a. The ABCD parameters,
b. The sending-end voltage and current,
c. The percent voltage regulation.
Question #4 A 60Hz, threephase, transmission line is 210 km long. It has a total series impedance of (0.06 +0.053) S2/km and a shunt admittance of j5.6 x 100 S/km. The supply provides 200MW (P) at 275kV (line voltage i.e. V.), with 0.9 powerfactor lagging (i.e. pf). Using the nominalT approximation, (1) ABCD parameters (ii) Receiving end voltage and current (iii) Receiving end power and power factor; (iv) Line voltage regulation (v) line efficiency (vi) Propagation constant (vii) Attenuation constant
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