Calculate the fault AC and DC components current in 2.5sec instant
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- 500MVA, 21KV, star connected, 3ph 50Hz synchronous generator is operating at the rated voltage, a 3ph fault occurs at its terminal. Its reactance in p.u. are 1.5 of synchronous, 0.5 of transient, 0.2 of sub transient. The transient time is 500ms and the sub transient time is 35ms. 1. What will the AC component be after 1.5 cycles?The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.Q2. The single-line diagram of a simple three-bus power system is shown in Figure-2. Each generator is represented by an emf behind the sub-transient reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 3 through a fault impedance of Zf = j0.19 per unit. (i) Using Th'evenin's theorem, obtain the impedance to the point of fault and the fault current in (ii) Determine the bus voltages per unit. ) j0.05 j0.075 j0.75 2 j0.30 j0.45 Figure-2: Single line diagram of the power system network for Q2 3
- The reactance of the synchronous generator after sometime of the fault cleared is ............Q5: A generator is connected through a transformer to a synchronous motor. Reduced to the same base, the per unit subtransient reactances of the generator and motor are 0.15 and 0.35, respectively, and the leakage reactance of the transformer is 0.1 per uint. A three-phase fault occurs at the terminals of the motor when the terminal voltage of the generator is 0.9 per uint and the output current of the generator is 1 per unit at 0.8 power factor leading. Find the subtransient current in per unit in the fault, in the generator, and in the motor. Use the terminal voltage of the generator as the reference phasor and obtain the solution (a) by using the internal voltages of the machines and (b) by using Thevenin's theorem.Question: Find out the appropriate protection schemes for stator winding protection of alternator. Analyze the protection schemes for internal and external LLL and LLG faults.
- A star connected neutral grounded 3-phase synchronous generator consists of 0.1 p.u of sub transient reactance ,0.3 p.u of transient reactance and 0.5 p.u of leakage reactance.The zero sequence reactance of the synchronous reactance is None of the above 0.5 p.u 0.7 p.u 0.6 p.uEqual area criteria is a method used to calculate: Select one: O a. None of the answers b. Critical clearing angle and time for transient faults O c. Critical clearing voltage angle for transient faults d. Transient stability current limit O e. Steady state stability power limits02. The 3-p generator is rated 20 MVA, 13.8 kV. The positive, negative & zero sequence reactances are respectively 0.25, 0.35 & 0.10 pu. The neutral of generator is grounded with reactance of 0.15 pu. Determine the sub-transient current & line to line voltages of the generator when a grievous fault occurs among the unsymmetrical faults at the generator terminals with the generator operating unloaded at rated voltage. Consider generator armature resistance is 0.2 Ω.
- The bus bars of a power station are in two sections A and Bseparated by a reactor. Connected in section A are two 12MVA generators of 15% reactance each and to B, 8 MVAgenerator of reactance 10%. The reactor is rated 8 MVA and15% reactance. Two feeders are connected to bus bar Athrough transformers, each rated at 4 MVA and 5% reactance.Determine the maximum short circuit MVA with which circuitbreakers on the outgoing side of the transformers have todeal.Try to solve this in 30 minutes. .( An 22 kV, 200 MVA alternator is grounded through a resistor of 5 Ω. The CT's have a ratio 2000/ 10. The relay is set to operate when there an out of balance current of 2 A. What percentage of the generator winding will be protected by the percentage differential scheme of protection?.. )13. A generator rated 30 MVA, 11 kV has a direct-axis subtransient reactance of 0.3 p.u. the negative and zero sequence reactances are 0.45 and 0.15 p.u. respectively. The neutral is solidly grounded. Determine the subtransient current in the generator when a line to ground fault occurs at the terminals of the generator with the generator running on no load at rated voltage. Ignore resistance. (