41 Consider figure 4 1 below and answer the questions that follow Protected windıng 400/1 200/1 to ict2 icti Irelay R Figure 4.1 Calculate la1, lat2 and Irelay if IFAULT= 4000A (4) 412 Draw figure 4 1 on your answer sheet and show the direction of 411 Iatt, Ietz and Irelay

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QUESTION 4
41
Consider figure 4 1 below and answer the questions that follow
Protected windıng
200/1
400/1
ict2
tct1
Irelay
R
Figure 4.1
Calculate lai, laz2 and Irelay If IFAULT= 4000A (4)
Draw figure 4 1 on your answer sheet and show the direction of
lat, laz and lrelay
411
4 12
What is the operatıng time for circuit breaker A and B for the fault shown in
figure 4 2 if the "discrimination by time" method is employed and cırcuit
breaker D is set to operate in 0 2s(note assume that a gradıng margin of
0 4s is required on the network)
42
A
C
D
0,2s
Figure 4.2
What is the main dısadvantage of the "discrimination by time" method?
43
44
Name the two essentials for a unit protection system
Transcribed Image Text:QUESTION 4 41 Consider figure 4 1 below and answer the questions that follow Protected windıng 200/1 400/1 ict2 tct1 Irelay R Figure 4.1 Calculate lai, laz2 and Irelay If IFAULT= 4000A (4) Draw figure 4 1 on your answer sheet and show the direction of lat, laz and lrelay 411 4 12 What is the operatıng time for circuit breaker A and B for the fault shown in figure 4 2 if the "discrimination by time" method is employed and cırcuit breaker D is set to operate in 0 2s(note assume that a gradıng margin of 0 4s is required on the network) 42 A C D 0,2s Figure 4.2 What is the main dısadvantage of the "discrimination by time" method? 43 44 Name the two essentials for a unit protection system
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