Abhishek_Satasiya_40197772

Give example scenarios in 'Power Grid Extension' and explain

(a) Give the condition for the loss of load in a power generation system in terms of outages in generation units (b) Give the assumption taken for the calculation of LOLP? [Write relevant Answers in 1 or 2 sentences in each part)

(c) With a sketch of block diagram, describe the importance of smart grid in modern electric power system.

Voltage sags due to short circuit and earth faults are the cause for the vast majority of equipment problems. Electronics equipment become more susceptible to voltage sag, hence the companies experience production stoppages. Voltage sag analysis is very complex issue. Based on voltage sag randon factors describe on it.

The reactance data for the power system shown in below figure in per unit ona common base is as the following: X²_x² j0.1 G₁ to j0.25 Ti Select one: O a. No right answer O b.-12.19 pu O c.-14.986 pu O d.-) 3.806 pu 2 j0.3 + AL j0.05 j0.25 Assume that the pre fault voltage at bus 2 = 1 pu. For bolted line (b) to line (c) fault at bus 2, the fault current is = j0.5 3 j0.25 T₂ 4 38 + A j0.25 j0.1 G₂ j0.05

Mention and discuss the uncertainties affecting the power system operation and planning indices.

write with technical material, digrams and pictures about Domestic electrical installation system

8.In a line-by-line failure we can expect Immersive reader A) Currents exist in the ground connections. B) The current values at the ground connections are zero. C) Short-circuit currents exist in all three phases. D) The voltages at the fault point with respect to ground are zero in the faulted phases. E) N. A.

In power system scenario of Sultanate of Oman, the present installed capacity in year 2021 is 9000MW. The peak demand is 8500MW. The annual increase in peak demand is happening at the rate of 10%. (a) Calculate the Future Reserve margin of the system in year 2022 if no additional installed capacity is added to the system. [ Write Future Reserve Margin as answer) (b) What is your inference for reporting to higher officials as a Electrical reliability Engineer from above mentioned calculation for year 2022? [Write your answer in one sentence]

:A-choose the correct answer for the following: I-Using a solid in the neutral and the earth in the systems that Operating voltage is: (a)below 2.2kV & above 33kV (b) between(2.2kV to 33&V) 2-In ungrounded system such repeated charging and discharging of line to ground capacitance resulting in repeated arcs is called: (a)fault current (bjarcing ground (cjearthing current 3-Using earthing transformer in the: (a)Star-connection system (b) Delta connection system (c)Star & delta connection system

QUESTION 1 (a) The per unit value of any electrical quantity is essential in any power system analysis. (1) Define per unit value of any electrical quantity. (11) Write down any three advantages of per unit computations. per unit base of th (b) The reactance of a generator designated by 'X' is given as 0.25 per unit base on the generator's name plate rating of 18 kV, 500 MVA. The base for calculation is 20 kV and 100 MVA. Find 'X' on the new base. (c) State the effects of the following on a transmission line: (1) Space between the phases (11) Radius of the conductors (d) Explain and state any two advantages for each of the following: (i) ring distributor (ii) service mains

Note : You have to click SUBMIT before the end of the time. So when the invigilator announce that you F click SUBMIT, then you must click it, otherwise your answers will not be saved. Hi, Mohammed Salim Ahmed Al. When you submit this form, the owner will see your name and email address. Assume that 8oW bulb and 100w bulb are connected in parallel and supplied by 240V ac .When 80w bulb is damaged then .. O Circuit breaker will trip and supply will be cutoff O 100 w bulb also will get damaged after some time O 100w bulb will glow very dim O 100w bulb will continue to glow with same brightness 32°C Sunny A O D 40) G E Chp prt sc delete home 8 backspace { O L 1. pause

Fill in the blanks 1. Grounding is connecting …….. of electrical equipment to earth.  2. When a …………………………….… fault occurs on an ungrounded neutral system, the potential of the healthy phases rise to the line voltage. 3. The method of reactance grounding is not used because of ……………………… appearing under fault conditions. 4. The cosine of the angle between the ………………………………………. and the ………………………………...…… is called the sending end power factor. 5. The AC power delivered to a load is equal to ………........

Explain the concept of a smart grid and how it can improve the efficiency and reliability of power systems.

A power generation plant connected to bulk load of high voltage industries shown in Figure Q3 has specifications given in Table Q3. Each equipment reactance is expressed in per unit on a common base of 100 MVA. a) Find the fault level for each bus bar in the generation plant. GI G2 TI Figure Q3: Single line diagram of a power generation plant Table Q3: Specifications of power system components Power System Component Voltage Rating X MVA Rating (kV) (pu) GI 50 33 0.2 G2 40 33 0.18 50 33/11 0.1 T2 40 33/11 0.1

Problem2 A generator having H = 6.0 MJ /MVA is delivering power of 1 per unit to an infinite bus through a purely reactive network when the occurrence of a fault reduces the generator output power to zero. The maximum power that could be delivered is 2 .5 per unit. When the fault is cleared, the original network conditions again exist. Determine the critical clearing angle and critical clearing time.

Discuss the concept of electrical grid resilience and strategies for minimizing power outages and disruptions.

A generator operating at 50 Hz delivers 1 pu power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place. reducing the maximum power transferable to 0.5 pu whereas before the fault, this power was 2.0 pu and after the clearance of the fault, it is 1.5 pu. By the use of equal area criterion, determine the critical clearing angle.

Q1. A// Choose the correct answer: 1. One of the advantage of using a per unit system in power system calculations is: a) To increase the accuracy of the results b) no computation are required to refer an impedance from one side of a transfo c) The per unit impedances of machines of the same type and widely different rating usually lie within a wide range. 2. The load is modelled in fault calculation of a power system by: a) A constant impedance b) An EMF in series with an impedance c) A constant impedance for a static load and an EMF in series with an impedance for rotating machines 3. The most famous fault in a power system is a) Symmetrical three phase fault b) Single line to ground fault c) Line to line fault 4. The type of unsymmetrical faults at which the sequence currents are equal( i.e 19 = 1 = 1) is: %3D a) Double line to ground fault b) Line to line fault c) Single line to ground fault 5. The ohmic reactance of a 0.1 pu, 30 kVA, 240/480 V single phase transformer referred to…

1) Explain the advantages of using per-unit in power system 2) Explain how, it was useful in Question1 and Question 2

Write the names of the given components and equipment in Table1. Table 1 1. 2. 3. 4. 5. .6. 7. 8. 9. 10. 11. 12.

Figure shows a generator connected to a metropolitan system (infinite bus) through highvoltage lines. The numbers on the figure indicate the reactances in p.u. Breakers adjacent to afault on both sides are arranged to clear simultaneously. Determine the critical clearing anglefor the generator for a 3-phase fault at the point P when the generator is delivering 1.0 p.u.power. Assume that the voltage behind transient reactance is 1.2 p.u. for the generator andthat the voltage at the infinite bus is 1.0 p.u.

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Question 1:a) State why voltage control and cable stranding are necessary in powersystemsb) Briefly explain where and how the following state variables ofa power supply grid are controlled.i) Frequencyii) Active powerili) Reactive poweriv Voltage.

Lightning stroke is most common cause of current impulsive transients in power system. True False