The positive sequence harmonics component will add current to the neutral wire. Select one: O True O False
Q: hree single-phase transformers are connected in delta-delta to step down a line voltage 138 kV to 80…
A: Given that Real power (Active power ) P= 24 MW power factor cosϕ = 0.89 (Lagging) Although formula…
Q: At the constant rating of a transformer or a synchronous generator when reactive power decreases the…
A: Power factor : Power factor (PF ) is cosine of angle between voltage and current . Reactive power…
Q: One needs a 100 kVAr A-connected TCR for a three-phase distribution system of 2.4 kVu, and 60 Hz.…
A:
Q: At the constant rating of a transformer or a synchronous generator when reactive power decreases the…
A: False. Solution given below.
Q: Two single phase transformers of 1000 kVA and 500 kVA with equal voltage rating 11 kV/ 400V…
A: Given Two single phase transformers of 1000 KVA and 500 KVA with equal voltage rating 11KV/400 v The…
Q: The difference between the scheduled reactive power and calculated reactive power is called mismatch…
A: Reactive power mismatch is the term used in power system in doing the Load flow analysis.
Q: Problem 2 A fault current limiter as shown in the figure, has Li = 1 mH and a total impedance of j10…
A: Circuit is given as, Given data: L1=1 mHf=60 Hz
Q: The national standard phase sequence in oman is R B Y Select one: True False
A: The national standard phase sequence in Oman is R B Y this statement is true.
Q: What is minimum and non minimum phase system. Draw its phase characteristic curve.
A: Transfer function is ratio of output signal to input signal. It is the given as ratio of Laplace…
Q: Q.6 (a) Explain in detail the four-quadrant operation of chopper and how it is differed from dual…
A: Operation of four quadrant chopper four quadrant chopper consists of four semiconductor switches and…
Q: 6. If a power system has 10,000 kVA capacity, operating at 0.7 lagging power factor and cost of…
A: consider the given question 6.
Q: When a generator is connected to infinite bus-bars, its frequency and terminal voltage are fixed…
A: True
Q: a-Calculate and draw the load current for the first two-period interval b-Calculate and draw the…
A:
Q: 59. Which of the following is the most probable impedance of a 100MW alternator? а. 5% b. 100% с.…
A: An alternator is an electrical generator that converts mechanical energy into alternating current…
Q: A 50 Hz, 13.6kv, 3-phase arternator with grounded neutral has inductance of 12 mH per phase and is…
A: Note- As per the Bartleby guideline for the question having more than three sub-part , only three…
Q: A 3 Phase, 11 kV, 5 MVA alternator has synchronous reactance of 10 2 per phase. Its excitation is…
A: V=11kv output = 5MVA Xs=10 E=14kv V/ph=11k3=6352 V E/ph=14k3=8083 V
Q: Given a tee connected system with power factor of 80 percent and true power of 2,500 kW. Calculate…
A: In this question we need to find a reactive power.
Q: A new industrial development has decided to'use two 350 kVA single-phase transformers to serve as an…
A: The explanation is as follows.
Q: For the same alternator, the ratio of rated KVA, when connected as 3-phase winding to when connected…
A: Given three phase alternator is connected to single phase alternator by utilizing all the coils
Q: 37. 29 Discuss the causes and consequences of harmonic distortion Enlict the Power quality issues…
A: Given We need to elaborate the causes and consequences of harmonic distortion in power systems.…
Q: Asynchronous generator, with synchronous reactance of 4 ohm, is connected directly to an infinite…
A:
Q: Manufacturers usually specify the impedances of machines and transformers in O Percent O Per-unit O…
A: Need to Find correct option
Q: The total impedance of an induction machine is given by 10.5+4.5i 0. If the phase voltage supplied…
A: The input power factor is 0.92. The explanation is provided below.
Q: Circuit Impedance Z = (Ω) Phase Angle =arc cos R/Z= Calculate Es = (V) Calculate Ec=(V) Calculate Er…
A:
Q: 10. Draw a neat diagram of a practical transform on load, with winding resistance and leakage…
A: Introduction: Transformer is a device that converts level of voltage, (increases or decreases)…
Q: The difference between the scheduled reactive power and calculated reactive power is called mismatch…
A:
Q: For the same alternator, the ratio of rated KVA, when connected as 3-phase winding alternator to…
A:
Q: The leakage reactance(XL)and the armature reactance (Xm) of the three phase unloaded alternator are…
A: False
Q: 2. How to solve electric circuit analysis using transform method (series circuit analysis & parallel…
A:
Q: Determine the per phase nominal impedance of a 30 MVA, 15kV three-phase alternator
A: we need to determine the per phase nominal impedance.
Q: For step -down chopper circuit, source voltage Vs=220V, Chopping period T=2000micro second, on…
A: Step- down chopper is the DC input voltage. It is the static device the average output DC voltage of…
Q: n impedance coil has a resistance 0 A from 220V, 60 Hz mains. What i e condenser connected in…
A:
Q: |Q8. In symmetrical fault analysis, network impedances are governed by Transmission line impedances…
A: in symmetrical fault, we do not consider ground resistance.
Q: Two similar star-grounded synchronous generators, one of which has its star point grounded, supply…
A: The nature of the fault current is mostly inductive reactive in nature. The flux produced by the ac…
Q: Q15. In paralleling of synchronous generators, the Synchroscope is used to indicate the…
A: The synchroscope is an instrument which use to determine phase angle differences and relative…
Q: Reactive Power Compensation Regulation, capacitive reactive power should not exceed what percent of…
A: Reactive Power Compensation Since the major load in power systems is an inductive load that…
Q: A distribution zone substation has a fault level of 400 MVA on the 11 kV bus. A 2 MVAR capacitor…
A: Given data, The value of system voltage is Vs = 11 kV. The value of capacitor bank is C = 2 MVAr.…
Q: High Low Q8. The importance of the fault analysis in a power system is, to determine Steady state…
A: The importance of fault analysis in a power system is to determine both steady state and transient…
Q: Explain why 7th harmonic is positive sequence while all triplen harmonics are called as zero…
A: Harmonics are quantities ( voltage or current ) that operate at frequency which is integer multiple…
Q: Main source of harmonics in the power system is Static power cinverter Resitive heating loads Power…
A: According to the question we have to discuss, the main source of harmonics in the power system.
Q: 1) One needs a 100 kVAr A-connected TCR for a three-phase distribution system of 2.4 KVLL and 60 Hz.…
A: A delta connected TCR has 100kVAr capacity of reactive power for a three phase distribution system…
Q: A lightning surge with a peak value of 3600kV strikes a transmission line at point A. Find the…
A: From the transient wave analysis
Q: Load impedance, ZZLL = 150 − jj70Ω is to be matched to a 50Ω line using a single series stub tuner.…
A: Given: ZL=RL+jXL=150-70j Ω Z0=50Ω
Q: 8. The governor droop characteristics of two 300 MW and 400 MW alternators appearing in parallel are…
A: For the given data frequency at which total load will be 600MW is determined
Q: Series capacitor compensation is used to reduce fault current levels Compensation of reactive…
A: In this question we will write about series capacitor compensation....
Q: Determine the primary line current of the following three phase circuit using a 5:1 step-down…
A: Converting the star connection of resistance to delta we get (By star delta conversion ) value of…
Q: non-sinusoidal quasi-square wave voltage v(t) is applied to a nonlinear load, resulting in a…
A:
Q: An industrial plant uses two 3-phase induction motors rated at 460 V. At full load one draws 232 A…
A: The solution is given below
Q: The component, which is used to connect the generating station to the outgoing feeders is Motor O…
A: In this question we will write component used for connecting generating station to feeders..
Q: In case of a Balanced load, the impedance values in all three phases should be same in magnitude and…
A: In case of balanced load, the three phases are displaced at 120 degrees to each other. Hence, the…
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- In a balanced system, the phasor sum of the line-to-line voltages and the phasor sum of the line-to-neutral voltages are always equal to zero. (a) False (b) TrueThe total instantaneous power absorbed by a three-phase motor (under balanced steady-state conditions) as well as a balanced three-phase impedance load is (a) A constant (b) A function of timeIn order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems. (a) Y- (b) -Y (c) Y-Y
- Explain why 7th harmonic is positive sequence while all triplen harmonics are called as zero sequence harmonics.Subject Power System QualityWhich termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformerFor the same alternator, the ratio of rated KVA, when connected as 3-phase winding to when connected as single phase alternator (by utilizing the coils) is, a.1.33 b.0.50 c.0.67 d.1.50
- The p.u. impedance value of an alternator corresponding to base values of 13.2 kV and 30 MVA is 0.2 p.u. Then the p.u. impedance value of an alternator for the new base values of 13.8 kV and 50 MVA is......Four identical alternators rated 25 MVA each has a per unit reactance of 0.50. These alternators are supplying power to a common bus bar at 13.8 kV. Solve the 3-phase short circuit MVA at the bus bar.1-In series R-L circuit transients, the momentary current imm is directly proportional to the RMS voltage. Select one: True False 2-Symmetrical components method are used to solve the symmetrical faults. Select one: True False 3-If the circuit has leading power factor, then it is called as _______________ circuit. Inductive Capacitive Resistive Resistive and Inductive
- Q13 Choose correct answer: In a single phase transformer, if the average value of emf is 235 V, then RMS value is A) 260.85 B) 407.03 C) 135.68 D) 117.50a-Calculate and draw the load current for the first two-period interval b-Calculate and draw the source current and find its average valueTwo single phase transformers of 1000 kVA and 500 kVA with equal voltage rating 11 kV/ 400V connected in parallel shares a common load. If the impedances of the transformer referred to secondary is 0.02 + j0.07 Ω and 0.05 + j0.175 Ω respectively, find the maximum UPF load can be connected to them without overloading