Question

(b) A radial system is shown below. The impedance of the line section between the busbars are given below 10 Ohms 20 Ohms 20 Ohms 100 volts A B C (i) Assume that the relay at bus A is set to pickup for faults at bus C and the pickup value is 1/3 of the fault current at C. What is the value of the pickup of relay A? (ii) If the ratio of the dropout to pickup is 0.09, what is the maximum load current at B for which the relay will dropout after the fault at C is cleared by the protection at B?

          (b) A radial system is shown below. The impedance of the line section
between the busbars are given below

10
Ohms
20
Ohms
20
Ohms
100 volts
A
B
C
(i) Assume that the relay at bus A is set to pickup for faults at bus C
and the pickup value is 1/3 of the fault current at C. What is the value
of the pickup of relay A?
(ii) If the ratio of the dropout to pickup is 0.09, what is the maximum
load current at B for which the relay will dropout after the fault at C is
cleared by the protection at B?

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(b) A radial system is shown below. The impedance of the line section
between the busbars are given below

10
Ohms
20
Ohms
20
Ohms
100 volts
A
B
C
(i) Assume that the relay at bus A is set to pickup for faults at bus C
and the pickup value is 1/3 of the fault current at C. What is the value
of the pickup of relay A?
(ii) If the ratio of the dropout to pickup is 0.09, what is the maximum
load current at B for which the relay will dropout after the fault at C is
cleared by the protection at B?

Added by Jean C.

University Physics with Modern Physics

Hugh D. Young 14th Edition

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Solved by Expert Pranay Shrivastava

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(a) Describe with the aid of a diagram the following protection concepts: 1. Differential comparison 2. Phase Angle comparison. b) A radial system is shown below. The impedance of the line section between the busbars is given below: 100 volts Assume that the relay at bus A is set to pick up for faults at bus C and the pickup value is 1/3 of the fault current at C. What is the value of the pickup of relay A? (ii) If the ratio of the dropout to pickup is 0.09, what is the maximum load current at B for which the relay will dropout after the fault at C is cleared by the protection at B?

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