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A Y-connected load bank with a three-phase rating of 500 kVA and 2300 V consists of three identical resistors of
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Chapter 8 Solutions
Power System Analysis and Design (MindTap Course List)
- A 3-phase, 50-Hz overhead transmission line 100 km long has the following constants : Resistance/km/phase = 0.1 Ω Inductive reactance/km/phase = 0·2 Ω Capacitive susceptance/km/phase = 0·04 × 10− 4 siemens Determine sending end voltage when supplying a balanced load of 10,000 kW at 66 kV, p.f. 0·8 lagging. Use nominal T method . Select one: a. 330 kV b. 52 kV c. None of the above d. 69.5 kVarrow_forwardA 3-phase Y-connected source (400V) supplies a 3-phase Y-connected load (3xZload = 27 + 9.0 ohm) via a non-ideal, three-core cable. No neutral line is available. Each conductor of the cable has an impedance Zcable = 80 + 2.1 mOhm a. Measure the phase shift angle between line voltage and phase voltage. b. Because of a fault, one of the three load impedances changes to half its original value. What happens to the phase voltages at the load.arrow_forwardA 3 phase 50 Hz overhead transmission line has the following contants: resistance per phase= 9.6ohms inductance per phase= 0.097 H capacitance per phase= 0.765 uF If the line is supplying a balanced load os 24,000 kVA at 0.8 pf lagging at 66kV, calculate using end condenser method: a. sending durrent b. line value of sending end voltage c. voltage regulationarrow_forward
- A three-phase overhead line has a load of 30MW, the line voltage is 33kV and power factor is 0.85 lagging. The receiving end has a synchronous compensator, 33kV is maintained at both ends of the line. (i)Calculate the MVAr of the compensator given that the line resistance is 6.5Ω per phase and inductance reactance is 39Ωper phase. (ii)Repeat your calculation using the short-circuit current at node method. Compare and explain the difference between the results.arrow_forwardA 3-phase, 50 Hz, overhead transmission line delivers 10 MW at 0·8 p.f. lagging and at 66 kV. The resistance and inductive reactance of the line per phase are 10 Ω and 20 Ω respectively while capacitance admittance is 4 × 10− 4 siemen. Calculate : (i) the sending end current (ii) sending end voltage (line-to-line) (iii) Power angle and sending end pf (iv) transmission efficiency Use nominal T methodarrow_forwardA 3-phase, 50 Hz, overhead transmission line delivers 10 MW at 0·8 p.f. lagging and at 66 The resistance and inductive reactance of the line per phase are 10 W and 20 W respectively while capacitance admittance is 4 × 10- 4 siemen. Calculate : (i)the sending end current (ii) sending end voltage (line-to-line) (iii) sending end power factor (iv) transmission efficiency Use nominal T method.arrow_forward
- a) A balanced three-phase delta-connected overhead line has constants A = 0.9/10°, B = 50/64° Ω . The receiving end line voltage is held at 330kV. The line is to transmit 1000MWat a power factor of 0.9 lagging at the receiving end. Determine the following: i) Receiving end current ii) Sending end voltage b) If the line is now to transmit 900 MW at a leading power factor of 0.8 at the receiving end determine the following: i) Receiving end current ii) Sending end current PLEASE Comment on your answers to a) and b) PLEASE I NEED CORRECT SOLUTION. THANK YOU.arrow_forwardA 3-phase, 50 Hz, overhead transmission line delivers 10 MW at 0·8 p.f. lagging and at 66 kV. The resistance and inductive reactance of the line per phase are 10 Ω and 20 Ω respectively while capacitance admittance is 4 × 10− 4 siemen. Calculate :(i) the sending end current (ii) sending end voltage (line-to-line)(iii) sending end power factor (iv) transmission efficiencyUse nominal T method.arrow_forwardA 3-phase, 50 Hz overhead transmission line has the following constants :Resistance/phase = 9·6 Ω Inductance/phase = 0·097 mH Capacitance/phase = 0·765 µFIf the line is supplying a balanced load of 24,000 kVA 0·8 p.f. lagging at 66 kV, calculate :(i) sending end current (ii) line value of sending end voltage(iii) sending end power factor (iv) percentage regulation(v) transmission efficiencyarrow_forward
- :A three-phase, three-wire, ABC system has effective line voltage 173.2 V. Wattmeters in lines A and B read -301 W and 1327 W, respectively. Find the impedance of the balanced Y-connected load. (Answer 10 angle -70° )arrow_forwardProblem 2The following two three-phase loads are connected to a three-phase system of 311.13 cos (377 t) V line: 1) Three-phase induction motor of 10000 VA in Y with a power factor of 0.62) Three-phase load balanced in Δ with Zf = 20 ∠ 323.13 ° Ω. Please finda) total current in each line,b) the apparent and reactive power andc) the copper losses that occur.arrow_forward3-phase ,50Hz overhead transmission line has the following constanats: resistance/phase=9.6ohms inductance/phase=0.097ohms capictance/phase=0.765uf if the line is supplying a balanced load of 24,000KVA 0.8 p.f lagging at 66kv calculate : sending end current line value of sending end current sending end power factor percentage regulation transmission efficiencyarrow_forward
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning