Work Breakdown Structure for electrical bus
Q: Explain the definitions of three sets of sequence components. Take voltages or currents for example,…
A: Three sets of sequence components: The power system fault causes an unbalanced condition of…
Q: Function of circuit breaker!
A: A mechanical device called a circuit breaker is made to shut or open contact members, which closes…
Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 2.2 kV…
A: Given Phase voltage = 2.2kv S = 80MVA FIND CURRENT
Q: Q5: A generator is connected through a transformer to a synchronous motor. Reduced to the same base,…
A:
Q: ix. What is the purpose of surge tank in hydro electric plant?
A: We are authorized to answer one question at a time, since you have not mentioned which question you…
Q: A Double Circuit Iransmission System will alwa have six cables or conductors suspended on the…
A: A double -circuit transmission line refers to the arrangement in which a total of six conductors are…
Q: B: A string of transmission line has 3 insulators, the total voltage distributed on them. Determine…
A: Over head line insulators: Always placed between tower and power conductor. The material should be…
Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 4.6 kV…
A: Fault current level? of the breaking capacity 70MVA Voltages = 4.6kV
Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 4.6 kV…
A: Given, phase voltage = 4.6kV Breaking capacity=40MVA fault current=?
Q: For three phase motor control the type of wire used for control wiring Select one: O 2.5 mm square,…
A: This question is related to Control wire size of the three phase motor.
Q: What is the phase displacement between any three currents of LLL fault of a three phase system.
A: LLL fault is called as the triple line fault.
Q: differentiate between overhead service connection and under ground service connection with sketch
A: Overhead Service Connection:- Electric locomotives, trolleybuses, and trams receive their electrical…
Q: Which type of Insulator used for LOW Voltage transmission line at dead-end tower: a. Pin Insulator O…
A: We need to tell about insulator used in transmission line .
Q: current and fault MVA, if a 3-phase fau
A:
Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 3.3 kV…
A: Given Phase voltage = 3.3kv S = 60 MVA FIND CURRENT
Q: "A 66 kV single core cable has a conductor diameter of 1.75 cm and a sheath of inside diameter 5 cm.…
A: As per the guidelines of Bartleby we supposed to answer first three subparts of the question for…
Q: complet The equivalent reactance of the double circuit line under post fault condition…
A:
Q: the slip-rings replaced by separated segments In order to generate a bidirectional Voltage true /…
A: This statement is true or false? "the slip-rings replaced by separated segments In order to…
Q: Label the parts of Tubular Steel Poles
A: Steel tabular poles are not commonly used poles these poles are used when there is need of low cost…
Q: A-phase to ground fault
A: Types of open circuit fault- 1) Symmetrical fault- Three phase line to ground fault Three phase…
Q: To interconnect grounding electrode and form grounding electrode system, connect the________ to a…
A: The bonding jumper is used to interconnect the grounding electrode and form a grounding electrode…
Q: Give examples of three phase Im and single phase im
A: In this question we will write example of three phase induction motor and single phase induction…
Q: In typical main and transfer bus scheme in distribution substation has some advantages and…
A: option b. (any breaker can't be taken out of service maintenance)
Q: sequence components o
A: For PU system- PU value=Actual value/Base value
Q: In case of permanent fault, for the coordination of protective devices the following data is…
A: For the above question. TCC All of these Feeder circuit diagram Location of protective device.…
Q: True/False A7 The cost of underground cable is much more than that of overhead conductor.
A: In this question, choose the correct option The given statement The cost of underground cable is…
Q: The distribution feeder is mainly protected from the lighting, by using the process of shielding…
A: A lightning arrester is a device that protects the insulation and conductors of an electric power…
Q: Voltage fluctuations will be there for consumers at distant end in Ring feeder O Radial feeder O…
A: In this question we will write in which feeder voltage fluctuations is there at consumers…
Q: In a short circuit test on 132 kV, 3-phase system, the breaker gives the following results: Power…
A:
Q: (b) Explain the steps involved in analysing balanced bolted fault in power system using Zbus method,…
A: Admittance matrix and impedence matrix is very important to analyze the power system .Admittance…
Q: Use of admittance
A: Use of admittanc? Admittance Y=1/Z= I/V This is. Inverse of impedance.
Q: d) Discuss the procedure for computation of fault current in power system when a double line to…
A:
Q: hree-phase gas pressure cable (Draw, Identify and Mark all the parts)
A: The power system has to transmit power from the generation side to the load side. For this purpose,…
Q: Draw the fault current direction both in Current transformer and operating relay coils for internal…
A: Restricted Earth Fault Protection system for Alternator Stator Winding. Fault types1. External fault…
Q: The minimum size ratio for following branch circuit conductor is: a. Twelve, 6 AWG conductor with…
A: From standard NEC table, area values are, a) 6 WG- 0.0507 in2b) 8 WG- 0.0366 in2c) 10 WG- 0.0211 in2
Q: The making current of 3-phase breaker with rating 2000 MVA, 33 kV will be
A: Given, Power rating, S = 2000 MVA Voltage rating, V = 33 kV
Q: Q3: Derive the relationship between positive and negative sequence components when single phasing…
A: Single phasing Three phase supply is fed to a load e.g. induction motor When one of the phase is get…
Q: For a 220 kV transmission, the number of suspension insulators required is
A: 220 kb transmission line
Q: is connected. Determine Foil current and output of transform
A: Transformer is a static device, which transfers electrical energy from one circuit to other circuit…
Q: If the Voltage in the Transmission or Distribution Lines increases to its breakdown value, a…
A: Electrical breakdown, also known as dielectric breakdown, happens when electrically insulating…
Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 4.6 kV…
A: Breaking capacity=50MVA Phase voltage=4.6kV
Q: What type of fault is Single phase to ground fault in power system.(Symmetrical or Unsymmetrical).…
A: In this question we will write about single line to ground fault...
Q: Explain briefly THREE (3) reasons for generation waste from electrical and electronic equipment.
A: There are various reasons for generation of e waste:- (1). Innovation in the technology is the major…
Q: Explain the working of LVDT with neat diagram.
A: LVDT : LVDT is divice which translates linear motion into electrical signal
Q: Due to the failure of circuit breaker the two phases of bus bar connected to generator are short…
A: If two phases of bus bar connected to generator are short circuited through fault impedance of j0.l…
Q: The minimum size raceway for the following branch circuit conductors is: One, 10 AWG…
A: Raceway sizing The conduit and tubing size required for an installationdepends on following factors:…
Q: Why the elements of Jacobian matrix belong to derivative of reactive power of a voltage controlled…
A: Voltage-controlled bus: It is also called a generator bus or PV bus. In this bus, the known…
Q: In a 3-phase, 4 wire unbalanced system, the current in neutral wire is 18 A. The magnitude of zero…
A: Given a 3-phase, 4 wire unbalanced system having, The current in neutral wire, IN=18 A
Q: The per unit values of positive, negative and zero sequence reactances of a network at fault are…
A: For double-line to ground fault, Vb=Vc=0Ia=0 Let the fault phases are b and c, then The positive,…
Work Breakdown Structure for electrical bus
Step by step
Solved in 2 steps with 1 images
- Equipment ratings for the five-bus power system shown in Figure 7.15 are as follows: Generator G1:    50 MVA, 12kV, X=0.2 per unit Generator G2: 100 MVA, 15 kV, X=0.2 per unit Transformer T1: 50 MVA, 10 kV Y/138kVY,X=0.10 per unit Transformer T2: 100 MVA, 15 kV /138kVY,X=0.10 per unit Each 138-kV line: X1=40 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine (b) the ThĂ©venin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.A single-line diagram of a four-bus system is shown in fiugre. Equipment ratings and per-unit reactances are given as follows.Machines 1 and 2: 100 MVA 20 kV; X1= X2 = 0.2; X0= 0.04 Xn= 0.05 Transformers T1 and T2: 100 MVA 20Y/345Y kV; X1 = X2 = X0 = 0.08. On a base of 100 MVA and 345 kV in the zone of the transmission line, the series reactances of the transmission line are X1 = X2 = 0.15 and X0=0.5 per unit. (a) Determine the bus impedance matrix for each of the three sequence networks. (b) Assume the system to be operating at nominal system voltage without prefault currents when a bolted single-line-toground fault occurs on phase A at bus 3. Compute the fault current, the current out of phase C of machine 2 during the fault, and the line-toground voltages at the terminals of machine 2 during the fault. Total detailed answer is needed. The figure is attached.Problem 5 Consider the system shown in the single-line diagram of Figure (3). All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. a- Find the fault current due to a bolted- three-phase short circuit at bus 3. b- Find the fault current supplied by each generator and the voltage at each of the buses I and 2 under fault conditions. 0.04 p.u. 0.2 p.u. 0.06 p.u. 0.2 p.u. 0.25 p.u. G, 0.2 p.u. 0.2 p.u. 0.06 p.u. 0.06 р.и. 3 0.25 p.u. 0.25 p.u. G, Figure (3) Single-line diagram for Problem 5 ele
- b) A fault occurs at bus 3 of the network shown in Figure Q4. Pre-fault nodal voltages throughout the network are of 1 p.u. and the impedance of the electric arc is neglected. Sequence impedance parameters of the generator, transmission lines, transformer and load are given in Figure Q4. V₁ = 120° p.u. V₂ = 120° p.u. V₂ = 1/0° p.u. V₂= 120° p.u. jXj0.1 p.u. JX2) 0.1 p.u. jX0j0.15 p.u. jXn-j0.2 p.u. 1 JX(2)-j0.2 p.u. 2 jX)=j0.25 p.u. JX20-10.15 p.u. jXa(z)-j0.2 p.u. 4 jX2(0)=j0.2 p.u. jXT(1) j0.1 p.u. jXT(2)=j0.15 p.u. jXT(0)=j0.1 p.u. Figure Q4. Circuit for problem 4b). = jXj0.1 p.u. j0.1 p.u. - JX(2) JXL(0) 10.1 p.u. = (i) Assuming a balanced excitation, draw the positive, negative and zero sequence Thévenin equivalent circuits as seen from bus 3. (ii) Determine the positive sequence fault current for the case when a three- phase-to-ground fault occurs at bus 3 of the network. (iii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus…Why the elements of Jacobian matrix belong to derivative of reactive power of a voltage controlled bus with respect to angle and magnitude of voltage is equal to zero.2. What's the primary instrument for locating a break in a cable during emergency maintenance?A. OSAB. OTDRC. MultimeterD. Power meter
- Consider the system shown in the single-line diagram of Figure (3). All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. a Find the fault current due to a bolted- three-phase short circuit at bus 3 b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions 0.06 p.u. 0.2 p.u. 0.04 p.u. 0.25 p.u. 0.2 p.u. 0.2 p.. 0.2 p.u. 0.06 p.u. 0.25 p.u. Figure (3) Single-line diagram ele ver ele 888 ele 0.06 p.u. 0.25 p.u.(b) Explain the steps involved in analysing balanced bolted fault in power system using Zbus method, beginning with the YbusDescribe the generator control Schemes for wind electric Schemes
- 4. Calculate three phase voltages and currents at fault location and at Bus G for a phase-A to Ground (L-G) fault at bus H, for a system as shown in Figure 2. Also draw the positive, negative, zero sequence networks and their interconnection diagram for this particular fault. 90 MVA 90 MVA 132kV H 132kV Line section Source Source B 100 MVA 100 MVA 132/69 kV 10% 132/69 kV 10% Figure - 2A 25 MVA, II kV generator has X"d=0.2 p.u. X2 = 0.3p.u. and X0=0.1 p.u. Tht neutral of generator is solidly grounded. Determine the subtransient current in the generator and the line to line voltages for subtransient condition when a Y-B-G fault occurs at the generator terminals. Assume prefault currents and fault resistance to be zero.Figure 3.39 shows a oneline diagram of a system in which the three-phase generator is rated 300 MVA, 20 kV with a subtransient reactance of 0.2 per unit and with its neutral grounded through a 0.4- reactor. The transmission line is 64km long with a cries reactance of 0.5-/km. The three-phase transformer T1 is rated 350MVA.230/20kV with a leakage reactance of 0.1 per unit. Transformer T2 is composed of three single-phase transformers, each rated 100 MVA, 127/13.2kV with a leakage reactance of 0.1 per unit. Two 13.2kV motors M1 and M2 with a subtransient reactance of 0.2 per unit for each motor represent the load. M1 has a rated input of 200 MVA with its neutral grounded through a 0.4- current-limiting reactor, M2 has a rated input of 100 MVA with its neutral not connected to ground. Neglect phase shifts associated with the transformers. Choose the generator rating as base in the generator circuit and draw the positive-sequence reactance diagram showing all reactances in per unit.