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1. What is the main purpose of overcurrent relay coordination?
A
To reduce system efficiency.
B
To ensure selective coordination and protect the power system.
C
To increase power consumption.
2. What is the typical time delay setting for an overcurrent relay?
A
Directly proportional to the fault current.
B
Constant for all fault currents.
C
Inversely proportional to the fault current.
3. What is the coordination time interval in overcurrent relay coordination?
A
The time for fault detection.
B
The time taken to install the relays.
C
The time between the operation of two protective devices.
4. What is the purpose of time grading in overcurrent relay coordination?
A
To ensure that the relay closest to the fault operates first.
B
To delay the operation of all relays.
C
To increase relay sensitivity.
5. What is the role of the time-current characteristic curve in overcurrent relay coordination?
A
To set the relay's voltage threshold.
B
To determine the relay's response to different fault currents.
C
To adjust the relay's time delay.
6. What is the purpose of a coordination study in overcurrent relay coordination?
A
To reduce system reliability.
B
To increase power generation.
C
To ensure that protective devices operate in the correct sequence.
7. What is the main consequence of improper overcurrent relay coordination?
A
Unnecessary tripping of healthy equipment.
B
Reduced maintenance costs.
C
Improved system protection.
8. What is the typical coordination margin used in overcurrent relay coordination?
A
10-20% above the expected fault current.
B
Less than the fault current.
C
Equal to the fault current.
9. What is the purpose of zone-selective interlocking in overcurrent relay coordination?
A
To prevent unnecessary tripping of upstream devices.
B
To increase fault detection time.
C
To reduce relay sensitivity.
10. What is the significance of time-current grading in overcurrent relay coordination?
A
To decrease the relay's operating time.
B
To ensure proper coordination between relays at different locations.
C
To increase relay response time.