In a distribution system, the transient faults occurs in Both OH distribution system underground distribution system None
Q: QUESTION TWO Power transformers are used in the power system to change the voltage levels to a level…
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Q: The station transformer is used for Select one: O a. To supply power section auxiliary O b.…
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Q: Which of the following is not a boundary condition for an SLG fault on phase 'a' of a power system?…
A: Since the single line to ground fault occurs on the phase a of the system the fault current of phase…
Q: 10. You're going to connect a surge protection device to a separately derived electrical system. In…
A: Based on the power system protection
Q: 5.26 An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z =…
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Q: The chances of faults in underground system are . . as compared to overhead system less more O above…
A: The difference between underground system and overhead system is given below: Overhead system…
Q: Process of solar desalination is same in winter and summer. Select one: True False
A: solar desalination uses the solar to desalinate the water.
Q: Design a system with two generators (at 11 kV) and three loads, two transformers and four…
A: system design requirements loads =3 transformers =2 transmission line = 4 generators =2 at 11 kV…
Q: Count the number of fault sites present in the circuit shown below: Y = f (a, b, c). a
A: Fault sites
Q: Which of the following transformers is having higher rated voltage
A: Which of the following transformers is having higher rated voltage?
Q: Distribution transformers are generally protected from damage due to excessive internal…
A: Ans: Option C is correct. Distribution transformers are generally protected from damage due to…
Q: FIGURE 1 shows four generators feeding into a sectionalised busbar with a fault limiting reactor. A…
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Q: The Power system component which is indicated by the symbol shown is A1 a) Two winding Transformer…
A: Option C Lightening arrestor All other options are wrong Here i have given symbols for all other…
Q: Power transformers are used in the power system to change the voltage levels to a level suitable for…
A: We are authorized to answer three subparts at a time. Since you have not mentioned which part you…
Q: 08. The importance of the fault analysis in a power system is, to deter Transient cor Steady state…
A: Fault analysis is done in power system to determine both transient and sub transient conditions.
Q: A 400 V, 3-phase alternator is subjected to an unsymmetrical fault. The
A: Ia=Ia0+Ia1+Ia2Ia=-j10+j6+j4=0Therefore , it is Double line to ground fault Fault current is -…
Q: 1) Prepare data for fault analysis of the system (see figure below). Recommended base MVA is 10 MVA
A: We are authorized to answer one question at a time, since you have not mentioned which question you…
Q: A 3 Phase, 375 kVA, 480V, 50 Hz, wye connected alternator has an equal positive and negative…
A: Given that Xpu=j0.10S=375 KVAVph=480V Calculate base current IBase=375×1063×480IBase=451.058 A
Q: A 3 phase fault occurs at bus 1. Fault impedance Z, =j0.2 p.u. Z,, = 0.07286 p.u. Then the fault…
A: In this answer we will try to find out the fault current at bus-1 as shown below. Fault current is…
Q: The reactance of the synchronous generator after few cycles of short circuit is The sequence…
A: Zph''< zph'< Zph Positive < negative< zero sequence imedances
Q: Which among these is the advantage of synchronous condensers? O The maintenance cost is low. O The…
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Q: In the system shown below, a symmetrical three phase short circuit fault occurs at 22 kV load…
A: It is given that: MVAbase=150 MVA
Q: Describe briefly, with the aid of suitable diagrams the cascade arrangement of transformers to…
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Q: Voltage control method connected across the load, to supply part of VAR required is O Shunt…
A: In this question we will define which voltage control method supply var connected across load...
Q: A transformer rated for 500 KVA 11 KV/0.4 KV has an impedance of 10% and is connected to an infinite…
A: Given values are - S=500kVA11kV/0.4kVZ%=10%Zp.u=0.1
Q: Location of fault is difficult in overhead line: Select one: O True O False
A: Need to find true false
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: Q8. The importance of the fault analysis in a power system is, to determine O Transient conditions…
A: Fault analysis in power system is to determine both transient and sub transient conditions.
Q: Question 6 Which of the following has the highest percentage of occurrence in a power networl L-L…
A: In this question , we will find which fault has highest percentage of occurrence...
Q: Which of the following is the severest and has the lowest percentage of occurrence? DLG L-L 3-Phase…
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Q: Distribution transformers are generally rated more than 33KV. Select one: O True O False
A: Generally distribution transformers are used in low voltage transmission such as 11kv, 6.6 kv,3.3kv…
Q: The system is normally used for rural distribution
A: Radial system is normally used in sub-urban or rural area for power distribution.
Q: There is a zero uence current in line to line fault. Select one: True O False
A: zero sequence currents are present only when fault involves ground . ground is involved only if line…
Q: One of the major threats due to electrical accidents is
A: There are several threats due to electrical accidents but obviously there are few major threats…
Q: Which fault can cause unacceptable circulating currer O a. Realistic fault O b. Transient Fault O c.…
A: 1)When the balancing current transformers of a unit protection system differ in excitation…
Q: Which of the following is not a boundary condition for an SLG fault on phase 'a' of a power system?…
A: Solution: Single line to ground fault (SLG fault) is the fault that occurs in the transmission line…
Q: Single line to ground fault of a solidly grounded generator positive sequence current is j2.5 p.u,…
A: Choose the correct option Positive sequence current= j2. 5 puri Then current flow in neutral?
Q: Load flow study is carried out for Stability studies Fault calculations System planning Load…
A: The load flow method is used to study the steady-state behaviour of the Power system. It gives an…
Q: In which of the following the positive, negative, and zero sequence impedances have different…
A: The positive sequence impedance and negative sequence impedance magnitude is same in case of the…
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A: Given Two 240 v fluorescent lighting units Unit-1The active current component of unit-1 isI1a=0.6…
Q: of the receiving-end transformers. Calculate the fault current in the 2 kV feeder lines, in the…
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Q: A three-phase, 33 kV oil eircuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking…
A: The given data are:
Q: For the circuit of Figure 1 calculate the complex impedance.
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Q: A 3-phase 33 kV, 37.5 MVA alternator is connected to a earth fault on one phase at the remote end.…
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Q: Q7. The determination of short circuit capacity is important to analyse Dimensions of the busbar…
A: Here need to define short circuit capacity is important to analyse
Q: Does the external chara. of series generator represent its lc
A: As per Bartleby guidelines we are allowed to solve only one question, please ask the rest again. The…
Q: Quèstion 6 Which of the following is not a boundary condition for an SLG fault on phase 'a' of a…
A: For single line to ground fault on phase 'a' all the fault current flows through phase a. And no…
Q: Single line to ground fault is one type of the unsymmetrical fault. Select one: O True O False
A: During line to ground falut positive, negative and zero sequence currents are available.becaue of un…
Q: A Cockcroft-Walton type voltage multiplier has six stages with capacitances, all equivalent to…
A: Given n=6 I= 6mA f=150-220 Hz C=0.03 micro farad Secondary voltage=100-200 kV Assumption We assume…
In a distribution system, the transient faults occurs in
Both
OH distribution system
underground distribution system
None
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Solved in 2 steps
- (5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.Fault analysis in power system2. When a large shunt capacitor is suddenly connected in parallel with the load bus in the distribution feeder, what would happen to this bus current? O A. Increase B. Decrease D. None of Above
- A Cock-croft Walton type voltage multiplier has 7 stages with capacitance all equal 0.07pF. The supply a frequency of to be supplied is 6.5mA. to transformer secondary voltage is 133kV at 250HZ. If the load current The total voltage ripple of the system is: (a) 15.3kv (b) 12.2kv (c) 9.1kV (d) 10.4kv (e) 1.9kv a. d O b. a OC C O d. e O e. bA parallel connection of a RL branch with a C branch is connected across a 100V AC mains. At first R = 10 ohms, L = 20mH and frequency of 1000rad / s, the current measured is 2.2361A at 89.44 leading power factor. A) Determine the initial capacitance. B) However, a fault occurs on the capacitor branch making its capacitance 20% lower and a resistance of 5 ohms is detected. If this faulty circuit is rerun but at a frequency of 500 rad / s, determine the new current that will flow through the circuit.Equal 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 limits
- The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) FalseA 3-phase, 10,000 kVA, 11 kV alternator has a subtransient reactance of 8%. A 3-phase short-circuit occurs at its terminals. The fault MVA and fault current areA three-phase uncontrolled bridge rectifier delivers power to a resistive load of 10N. The output voltage of the rectifier is 400 V DC. The rating of source side of three phase delta – star transformer is, (a) 14.875 kVA (b) 16.765 kVA (c) 15.475 kVA (d) 16.025 kVA
- The chances of faults in underground system are as compared to overhead system .... O less more above noneCan we improve a leading load pf using a synchronous condenser? Explain briefly your answerin one(1) sentence.90KVA, 460/230 3Phase transformer, Determine the Primary Conductor Size (include the AWG size number), Secondary Conductor Size (include the AWG size number), Primary Protection Breaker, and Secondary Protection Breaker. uarn