Repairs have to be carried out on HV cir-cuit breaker No. 6 shown in Fig. 26. If thethree 220 kV lines must be kept in service,which disconnecting switches must be keptopen? HV LINE 1220 kVlightning2 current transformerarresterHV disconnectgrounding switchHV disconnect30HV circuit breaker32 KAHV tie lineHV disconnectmotorizeddisconnect 83334lightning 1011 groundingarrester36/48/60 MVA, 60 Hz Y= mig220 kV/24.9 KV.grounding transformer$12switch13 lightningarrester3536MV circuit breaker 25 kA 14MV disconnect 15MV tie line17HV LINE 2220 kV37382HV LINE 3220 kVh11711-linecircuitbreaker 12 kAreactor1617АвтовоКотово197feeder 18T24табатын китобКотовороботою натов25ротобионтвтобо2026коловон214ьтовонотовонароботок матововтово22237T29-

The question is about determining which disconnecting switches must remain open when repairing HV…

Answered: Repairs have to be carried out on HV…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.16MCQ

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For the system shown in Figure 2, directional overcurrent relays are used at breakers B12, B21, B23, B32, B34 and B43. Overcurrent relays alone are used at B1 and B4.a) For a fault at P1, which breakers do not operate? Which breakers should be coordianted? Repeat (a) for a fault atb) P2c) P3
Most residential general lighting circuits are wired with 14-AWG copper conductors and are protected by 15-amp circuit breakers. However, there are many electricians who install 12-AWG copper conductors and protect them with 20-amp circuit breakers. How will you know which conductor size and which circuit breaker size will be used for the general lighting branch circuits in the house you are wiring?
If an unsymmetrical fault occurs on phase C of a transmission line, what would make the fault symmetrical? A. if phase C of the transmission line opens B. If phases A and B become faulted C. If two different faults occur on phas a and b
From figure below, if 3 phase bolted fault occurs. Using Zbus method to choose a suitable rating of C.B's. Data are as follows: Gl: 100 MVA, 22 Kv,Xgi" = 0.2 pu G2: 100 MVA, 22 KV, X2"=0.15 pu TR1: 100 MVA, 22/220 KV, XTr1 =0.1 pu TR2: 100 MVA, 22/220 KV, XTR2 =0.1 pu CB TR1 1 ZTL-J50 ohm TR2 св св G2 3 Zload =(0.2 + j0.1) pu CB
NO AI. Thank You
In a short-circuit test on a 3-pole, 110 kV circuit breaker. Power factor of the fault= 0.4. Recovery voltage= 0.95 times (full line voltage) The breaking current was symmetrical the restriking transient had a natural frequency of 15000 c/s. Determine the average rate of rise of restriking voltage. (The natural is grounded and the fault involves earth). Explain in details.
Calculate the neutral current in a 120/240-volt, single-phase system when the current inphase A is 20 amperes and the current in phase B is 40 amperes. The load is resistive. Calculate the neutral current in a 208Y/120-volt, 3-phase, 4-wire system when thecurrent in phase A is 0, in phase B is 40, and in phase C is 60 amperes. The load isresistive
21
c.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.
Why are circuit breakers and fuses ineffective in protecting against transient over voltage due to lighting and switching surges?
i need the answer quickly
Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 1, bus 2, or bus 3.( Only one bus location) And give this answer For a symmetrical three phase fault on the bus 1.Draw the reactance diagram for the fault with all the reactances marked in per unit. 2.Determine the Thevenin's equivalent circuit which can be used to calculate the fault current. (3) Calculate the fault current in ampere and fault power in MVA. (4) Calculate the fault current contribution from the generator connected to the bus for fault calculation.

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