A three-phase, 33 kV oil eircuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking cunent is

Q: A three-phase, 33 kV oil eircuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking

A: As given, the three phase 33-Kv oil circuit breaker having ratings: Evaluating the symmetrical…

Q: Using the Ohmic Reactance method, Calculate: 1. Total impedance in 2 at 1000 V (use the table to…

A: 1) The 3-phase system is given as Since, prior to the fault, the system was in No-load condition.…

Q: What's the maximum primary overcurrent device rating for a 0.50 kVA (500 VA), single-phase, 240V…

A: single phase transformer: S=VpIp500=240IpIp≅2.08 Ampere

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: 30kV, 50MVA generator having a solidly grounded neutral and Z1 = 0.25pu, Z2=0.15pu and Z0=0.05pu.…

A: Let Zn represents the limiting reactance.  Let us also assume that the fault current is equal to 1…

Q: _It is required to generate alternating voltage using (single transformer 2KVA),( single transformer…

A: Single transformer T1 = 2 KVA Single transformer T2 = 100 KVA

Q: A 30 kv, 50 Hz, 50 MVA generator has the positive, negative, and zero sequence reactances of 0.25…

A: Evaluating the value of the fault current for the single line to ground fault:

Q: A 5 kVA, 50 V/100 V, single-phase transformer has a secondary terminal voltage of 95 V when loaded.…

A: Given values are - S=5kVAE1E2=50100V2=95Volt

Q: A three phase, wye-delta connected, 345/34.5 kV transformer has an emergency rating of 60 MVA.…

A: Transformer is a device which is used to increase or decrease the input or output voltage which are…

Q: If all the sequence voltages at the fault point in a power system are equal, then the fault is a…

A: When all the sequence voltages at the fault point in a power system are equal, then the fault is a…

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: A 330 kV power system contains three substations A, B and C having fault levels of 20 GVA each. The…

A: Given data, Voltage V= 330 kV Power P=20 GVA   =20×103 kVA Given circuit,

Q: a) Examine and Identify the cause of the followings: i) The air blast breakers are very sensitive…

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…

Q: 3. Two T-connected transformers are used to supply a balanced load of 100 kVA at 400 V from a…

A:

Q: FIGURE 1 shows four generators feeding into a sectionalised busbar with a fault limiting reactor. A…

A:

Q: A circuit breaker has the following ratings: rated S/C current of 20000 A at the maximum rated…

A: Given data  Rated short circuit current = 20000 A Maximum rated voltage = 75 KV Continuous current =…

Q: A 12 MVA, 132/6.6 kV, transformer having a reactance of 0.15 pu is fed from an infinite bus. The…

A: The components given in the circuit will be replaced by per unit reactance respectively. The…

Q: Discuss different types of Air blast circuit breakers. Explain with the help of neat and clean…

A: The air blast circuit breaker, according to the type of flow of blast of air is of three types. 1.…

Q: Lightning over-voltages and switching phenomena of switchgears are two examples of transient…

A: Lightning surge: A lightning surge is a very short burst of high voltage which if not suppressed can…

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 oil circuit breaker is rated at 1600 Amps, 33 kV, 2000 MVA and 4 sec. Value of breaking…

A:

Q: Problem #2: A transformer is fed from a 100 MVA, 18 kV generator via a 5-cycle breaker. Generator…

A: Given S =100 MVA V =18 KV Xd'' =18%Xd' =25%Xd =120%

Q: A 23 KVA single phase transformer has a voltage of 13.8 kV on the primary and 230 on the secondary…

A: Fuse: It is a device that disconnects the circuit when the current rises above its rating. This is…

Q: A report on Fault analysis in presence of renewable energy sources.

A: Fault in electrical equipment or apparatus refers to an imperfection in the electrical circuit due…

Q: 25 MVA 13.8 kV generator with X"d=15% is connected through a transformer to a bus which supplies…

A: Fault currents that are symmetrical and asymmetrical. The system/synchronous machine's reactance is…

Q: A 25 KVA, 100 V/300 V, single-phase transformer has a secondary terminal voltage of 280 V when…

A: Given, A single phase transformer is having S=25 kVAV1:V2=100V/300V Secondary load voltage, V2fl=280…

Q: A 35KVA, transformer has 50 Hz frequency input with voltage values given as 300/220V, with primary…

A: It is given that: kVA=35 kVAf=50 HzV1V2=300220N1=550

Q: In a distribution system, the transient faults occurs in Both OH distribution system…

A: Choose the correct option   In a distribution system, the transient faults occurs in?

Q: A three phase A-Y connected transformer with 50 MVA, 33:11 kV is protected with a differential…

A: When designing a relay, circuit breaker, or other protective equipment, keep in mind that power…

Q: A 6 KVA, 100 V/500 V, single-phase transformer has a secondary terminal voltage of 487.5 V when…

A:

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: In a power system the short circuit KVA due to symmetrical fault occurred away from generating…

A: Short circuit MVA =base MVA/equivalent impedance seen from fauld point. From above short circuit MVA…

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: Calculate the operation time of an overcurrent relay of (10 A , 3 seconds) that has a current…

A:

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: If all the sequence voltages at the fault point in a power system are equal, then the fault is a…

A: Choose the correct☑ option If all the sequence voltage at the fault point system are equal, then…

Q: QUESTION 17 What's the maximum primary overcurrent device rating for a 2.50 kVA, 480V, single-phase…

A: Transformer is a static device which transfers power from one circuit to another circuit without…

Q: A 12 MVA, 132/6.6 kV, transformer having a reactance of 0.15 pu is fed from an infinite bus. The…

A: We will replace the components given in the circuit with per unit reactance respectively. The…

Q: Figure 4 (c) shows two (2) 11 kV/415V distribution transformers are connected using 2 incomings with…

A:

Q: sunny Note: - You are attempting question 4 out of 12 A three phase,20 MVA, 33 kV alternator having…

A: In this question we need to choose a correct option.

Q: STRF = 6 MVA XTRF = % 3 UB / Uc = 36 kV/6 kV Generator A B C D KA XHCD = j 0,5 Ohm Kci Kc KB XHAB =…

A: Consider the Base MVA =4 MVA                           Base KV=36 KV

Q: A 112.5 kva, 480v primary to 120/240v secondary, three-phase transformer with a 300 amp secondary…

A: kcmil—In the North American electrical industry, conductors larger than 4/0 AWG are generally…

Q: 3. The most famous fault in a power system is a) Symmetrical three phase fault b) Single line to…

A:

Q: A single phase 50 Hz core type transformer has rectangular cores 30 x 20 cm. and the maximum…

A: The solution can be achieved as follows.

Q: A 3-phase, 11 kV, 25 MVA generator with X, 0-05 p.u.. X, = 0.2 p.u. and X, = 0-2 p.u. is grounded…

A: We have a 3-phase generator as shown in figure. With given data, Zero sequence reactance (X0) = 0.05…

Q: Overcurrent devices are generally not permitted on the ____ conductor. a. ungrounded b. phase c.…

A: Overcurrent devices are generally not permitted on the ____ conductor.

Q: Draw the basic circuit of 2 stages cascaded transformers if the apparent power of the last stage is…

A:

Memory Size

A memory unit is the amount of data that can be stored in a storage unit. Some storage devices are RAM, hard drive, memory card, flash drive, etc. In the age of exponentially growing digital media, knowledge of how computer memory works is a key skill.