Q: For the following OLD, take Sg = 50 MVA and VB = 22 kV at the %3D transmission line to find the short circuit current if a 3-ph fault occurs at the middle of transmission line. 15 MVA 20 MVA X = j0.6 pu (15:35) kV X = j0.3 pu (40:15) kV 25 MVA 15 MVA (6+j8) Q 23 kV (G X = j0.5 pu (м) 18KV x = j0.3 pu TL T1 T2

Q: For the following OLD, take Sg = 50 MVA and VB = 22 kV at the %3D transmission line to find the short circuit current if a 3-ph fault occurs at the middle of transmission line. 15 MVA 20 MVA X = j0.6 pu (15:35) kV X = j0.3 pu (40:15) kV 25 MVA 15 MVA (6+j8) Q 23 kV (G X = j0.5 pu (м) 18KV x = j0.3 pu TL T1 T2

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter10: System Protection

Section: Chapter Questions

Problem 10.1P

See similar textbooks

Similar questions

Q: For the following OLD, take Sg = 50 MVA and VB = 22 kV at thetransmission line to find the short circuit current if a 3-ph fault occurs atthe middle of transmission line.15 MVA20 MVAX = j0.6 pu(15:35) kVG-EX = j0.3 pu25 MVA(40:15) kV15 MVA(6+j8) Q23 kVM18 kVT.LX = j0.5 puT1T2´x = j0.3 pu
Refer to Figure 1. Using its equivalent reactance diagram, what is the total impedance of the system up to the fault point at the end of the receiving line (in per unit)? Below are the parameters: G1 : 9 MVA, 13 kV, j0.11 p.u. G2 : 8 MVA, 13 kV, j0.06 p.u. T1 : 9 MVA, 13/69 kV, j0.042 p.u. TL : 262 km, 0.031 ohm per km, 0.3 ohm per km, operates at 69 Base values are that of G1. Round your answer to 2 decimal places. what is the fault MVA of the system when a three-phase fault occurs at the receiving end?
The parameters of transposed overhead transmission line are given as: self reactance Xs=0.4 ohm/km and mutual reactance Xm=0.1 ohm/km. The positive sequence reactance X1 and zero sequence reactance X0, respectively, in ohm/km are (A) 0.3, 0.2 (B) 0.5, 0.2 (C) 0.5, 0.6 (D) 0.3, 0.6
Line impedances for the power system shown in Figure 1 are Z12 = Z23 = 3.0 + j40.0 Ω, and Z24 = 6.0 + j80.0 Ω. Reach for the zone 3 B12 impedance relays is set for 100% of line 1–2 plus 120% of line 2–4. (a) For a bolted three-phase fault at bus 4, show that the apparent primary impedance “seen” by the B12 relays is Zapparent = Z12 + Z24 + (I32/I12)Z24 where (I32/I12) is the line 2–3 to line 1–2 fault current ratio. (b) If |I32/I12| > 0.20, does the B12 relay see the fault at bus 4?
a) Draw the sequence network and calculate the sub-transient fault current for a dead short circuit on one phase to ground at bus 4 with fault impedance j1.78 p.u for the system shown in Fig. The system data's are Machine 1: Xd”=j0.21p.u , X2=j0.4p.u; X0= j0.55p.u ; Machine 2: Xd”=j0.21p.u , X2=j0.4p.u; X0= j0.55p.u ; Transformers T1 and T2 : X1=X2=X0= j1.2p.u The transmission line reactance X1=X2= j0.21p.u and X0=0.97 p.u.
For the power system with a single line diagram;Draw the reactance diagrams of the zero, positive and negative component circuits of the system by selecting the base values of 1000 MVA and 20 kV in the generator G3 region. (?0=?1=?2=50 ?ℎ? for each line)
A short 3-phase transmission line connected to a 33kV, 50 Hz generatingstation at the sending end is required to supply a load of 10 MW at 0·8lagging power factor at 30 kV at the receiving end. If the minimumtransmission efficiency is to be limited to 96%, estimate the per phasevalue of resistance and inductance of the line.
A three-phase, 50Hz transmission line with a length of "240" is given. It has values of “27” MVA, 0.8 reverse power coefficient and phase voltage “134” kV (phase-phase) for the end of line. Transmission line conductors are placed “3.2” meters apart. The conductors are known to have a resistance of 0.11ohm/km and a diameter of 1.6cm. Neglecting the leaks and using the π equivalent circuit; ( ε0=8.854*10^(-12) F/m, μ0=4*π*10^(-7) H/m) 1) Find the total impedance value of the line, the end of line current, the line voltage at the end of the line, the line head phase and the line beginning line voltage?
A three-phase, 50Hz transmission line with a length of "240" is given. It has values of “27” MVA, 0.8 reverse power coefficient and phase voltage “134” kV (phase-phase) for the end of line. Transmission line conductors are placed “3.2” meters apart. The conductors are known to have a resistance of 0.11ohm/km and a diameter of 1.6cm. Neglecting the leaks and using the π equivalent circuit; ( ε0=8.854*10^(-12) F/m, μ0=4*π*10^(-7) H/m) Find the Inductance and Capacitance of the line for 1 km length? , Find the total ohmic resistance of the line, the total inductive reactance of the line.
A three-phase, 50Hz transmission line with a length of "240" is given. It has values of “27” MVA, 0.8 reverse power coefficient and phase voltage “134” kV (phase-phase) for the end of line. Transmission line conductors are placed “3.2” meters apart. The conductors are known to have a resistance of 0.11ohm/km and a diameter of 1.6cm. Neglecting the leaks and using the π equivalent circuit; ( ε0=8.854*10^(-12) F/m, μ0=4*π*10^(-7) H/m) a-) Find the Inductance and Capacitance of the line for 1 km length? b-) Total ohmic resistance of the line c-) The total inductive reactance value of the line
please help solve this question A 100 km Three-Phase 50 Hz transposed transmission line is composed of bundle of three ACSR, 1,431,000 cmil, 47/7 Bobolink conductors as shown in Figure 2 (a). The Three-Phases (bundled Conductors) have flat horizontal spacing of 11 meters as shown in the Figure 2(a). The conductors have a diameter of 3.8 cm and a GMR of 1.5 cm. The Line is going to be replaced with a six conductor bundle of ACSR, 477,000 cmil, 26/7 Hawk conductors. The conductors have a diameter of 2.5 cm and a GMR of 0.9 cm. The new line will have a horisontal phase spacing of 14 meters as it is going to be operated at higher Voltage rating. The new line is shown in Figure 2 (b). The spacing between the bundles in Figure 2 (a) and (b) is 45 cm. Determine,a) The capacitance for each case and the percentage change in capacitanceb) The inductive reactance for each line and the percentage change.c) The inductance for each case and the percentage change ininductance
The single line diagram of a power system is shown below. Load represented as impedance, (13.2) kV voltage It draws 60 MVA power from the system when it is below and (0.9) back power factor. Generators and transformers The related electrical parameters are given below. According to this; a) Calculate all impedances in this given circuit in pu and draw the equivalent impedance diagram of the circuit. (Select the base values as 100 MVA and 13.8 kV.) b) Since the voltage values of the generators are given as E1=1.1∟0° pu and E2=1.25∟10° pu, Calculate the value of the voltage (V1).