In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generators are connected in star with thier star points grounded. The system base is 15 MVA. The transformers all have reactances of 0.04 p.u. on this 15 MVA base. The reactances of all other elements are given in Table 1 (in $2) and the voltage levels are given in Table 2. 2 T1 L 01/10 jä 3 T3 p.u. Per-Unit Convert all values to p.u. on a 15 MVA base. Xax= Xc₂= XL = p.u. p.u. G1 V BABE Figure 1: A section of the distribution system X G1 T1 G1 9/10 4 Table 1: Sequence reactances (12) 0.3 0.59 0.01 L G2 Fault Voltage What is the voltage at bus 3 (in Volts) after the fault has occurred? V T2 10 10/4 Table 2: Voltage bases (kV) T2 G2 T3 5 10/9 G2 Fault Current A three-phase fault with a fault reactance of 0.01 p.u. occurs at bus 3. Calculate the fault current flowing at the fault point in kA. IF=j KA Sc Unan
In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generators are connected in star with thier star points grounded. The system base is 15 MVA. The transformers all have reactances of 0.04 p.u. on this 15 MVA base. The reactances of all other elements are given in Table 1 (in $2) and the voltage levels are given in Table 2. 2 T1 L 01/10 jä 3 T3 p.u. Per-Unit Convert all values to p.u. on a 15 MVA base. Xax= Xc₂= XL = p.u. p.u. G1 V BABE Figure 1: A section of the distribution system X G1 T1 G1 9/10 4 Table 1: Sequence reactances (12) 0.3 0.59 0.01 L G2 Fault Voltage What is the voltage at bus 3 (in Volts) after the fault has occurred? V T2 10 10/4 Table 2: Voltage bases (kV) T2 G2 T3 5 10/9 G2 Fault Current A three-phase fault with a fault reactance of 0.01 p.u. occurs at bus 3. Calculate the fault current flowing at the fault point in kA. IF=j KA Sc Unan
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
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.26P: A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a...
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