a single line diagram of power system

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Figure 2 shows a single line diagram of power system distribution zone and a table
2 is the characteristic of the figure 2.
a.
HV SUPPLY
A
B
D
11 KV
Figure 2: Single line diagram of radial power system
Table 2: Power system characteristic of figure 2.
Zone A
600/5
Zone B
300/5
Zone C
200/5
Zone D
100/5
CT Ratio
Load
Current (A)
700
320
190
75
The transformer at the High Voltage (HV) supply is having current flow of 6000A when
short circuit occurs phase to phase located at zone D. Overcurrent relays are located at
location A to D are set using siandard inverse curve, calculate:
i.
Plug setting multiplier, PSM.
ii.
Relay operating time, ROT.
iii.
Time multiplier setting, TMS
iv.
Relay actual operating time, RCOT
Discuss and compare the sensitivity values of the over-current relays when they
are set using very inverse curve.
V.
Transcribed Image Text:Figure 2 shows a single line diagram of power system distribution zone and a table 2 is the characteristic of the figure 2. a. HV SUPPLY A B D 11 KV Figure 2: Single line diagram of radial power system Table 2: Power system characteristic of figure 2. Zone A 600/5 Zone B 300/5 Zone C 200/5 Zone D 100/5 CT Ratio Load Current (A) 700 320 190 75 The transformer at the High Voltage (HV) supply is having current flow of 6000A when short circuit occurs phase to phase located at zone D. Overcurrent relays are located at location A to D are set using siandard inverse curve, calculate: i. Plug setting multiplier, PSM. ii. Relay operating time, ROT. iii. Time multiplier setting, TMS iv. Relay actual operating time, RCOT Discuss and compare the sensitivity values of the over-current relays when they are set using very inverse curve. V.
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