.......1- A fault occurs in the protection system as shown belowlelllllllTo load200: 1500 A2000 A200: 1a- The current of 10A flows inside the relayTrue or Falseb- The fault is called earth faultTrue or FalseThe relay is called voltage differential relayTrue or FalseC-eele

(a) The current that enters the relay circuit from CT-1 is As the fault occurs outside the…

Answered: ....... 1- A fault occurs in the…

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

Chapter10: System Protection

Section: Chapter Questions

Problem 10.17P

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FIrst 3 question answers are give below answer the last two partsanswers: 1) relay at C (CT ratio) = 40 : 1 relay at B (CT ratio) = 60 : 1 relay at A (CT ratio) = 40 : 1 2) TMS/A = 0.711 3) top = 1.48 sec ( relay will operate as per the fault current level.) i) Design appropriate CT ratios for CTA, CTB, and CTC. (ii) Estimate time of Operation for all three relays for maximum value of fault current to maintain the selectivity. (iii) Determine TSM for relays at bus A and B for maximum fault current. (Use the standard formula for IDMT relays for these calculations.) (iv) Also use the standard curves for IDMT relays shown in Figure 2 to select TSM for relays at bus A and B for maximum fault current. Compare results obtained in (ii) and (iv). Verify the design to ensure that selectivity is maintained at minimum fault current for the fault in the same zone
Larger conductors should be used for long runs to minimize the? A. Current B. Voltage drop c. Transformer retio d. Interrupt rating
Determine the time of operation of a 5-ampere, 3-second overcurrent relay having a current setting of 125% and a time setting multiplier of 0·6 connected to supply circuit through a 400/5 current transformer when the circuit carries a fault current of 4000 A. Use the curve shown in figure below
Q1. Why Earth Leakage Circuit Breaker is important? Draw a neat diagram of Earthing system.
Given a 3-Ampere, 5-second overcurrent relay having a current setting of 150% and a time setting multiplier of 0.4 connected to the supply circuit through a 300/2 current transformer, a 3500 A fault current was carried through the circuit. Determine its time of operation
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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
Equipment Grounding 10. Which of the following statements about ground faults is true?A. They usually occur between any grounded circuit conductor and the equipment grounding conductor. B. They're often normal and typically intentional.C. They can't result from human error.D. They can happen if a conductive tool is dropped in an energized equipment's electrical enclosure.
a) Classify the four categories of 3 phase power system faults we experience in our electrical power industry. b) Explain the emergence of such power systems fault as required in (question 1a)? c) Point out each type of fault specified under (a). d) Produce the (1D) design of the three-phase star connected faults stated under(b)
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12. Which of the following statements about ground faults is true?A. They can happen if a conductive tool is dropped in an energized equipment's electrical enclosure.B. They usually occur between any grounded circuit conductor and the equipment grounding conductor.C. They can't result from human error.D. They're often normal and typically intentional.

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....... 1- A fault occurs in the protection system as shown below lelllllll To load 200: 1 500 A 2000 A 200: 1 a- The current of 10A flows inside the relay True or False b- The fault is called earth fault True or False The relay is called voltage differential relay True or False C- eele