If you think you have a good understanding of TCC Curves for Selective Coordination, challenge yourself and take our quiz.
Best of Luck.!!
Question 1 of 18
Which characteristic of power system protection defines the accuracy of the protection device?
Selectivity
Sensitivity
Speed
None of the above
Question 2 of 18
The protection system should not exceed ____ % of the overall cost.
40
35
30
25
Question 3 of 18
The primary objective of the power system protection is :
To sense fault
To isolate faulty part from the healthy part
Both (a) and (b)
Question 4 of 18
Which statement is correct about a relay?
Relay’s TCCs are thinner and sharper than fuse and breaker TCCs
Relay sense faults only
Relay isolates fault
Question 5 of 18
In solid-state breakers, the instantaneous pickup is ____ times of long time ampere rating:
1.5 to 10
2 to 40
5 to 70
Question 6 of 18
In solid-state breakers, the short time pickup is ____ times of long time ampere rating:
Question 7 of 18
In a solid-state relay, short time delay has how many settings are available:
1
2
3
4
Question 8 of 18
In the thermal-magnetic breaker, which statement is correct for the magnetic part:
It senses high over current and short circuit
It has no intentional delay
It has a delay
both (a) and (b)
Question 9 of 18
Selective coordination is achieved by:
Selecting the right protective device
By adjusting the time-current curve of the protective device
Both (a) & (b)
Question 10 of 18
If a fault occurs in a particular zone:
The protective device of that zone will sense the fault
The upstream device above that zone will sense the fault
The protective device of that zone will clear the fault in the least time
All of the above
Question 11 of 18
On Etap, TCCs of a selected system can be achieved by using :
Star protective protection tab
Short circuit analysis tab
Load flow analysis tab
Question 12 of 18
For the selectivity purpose, the pickup setting between an upstream and downstream breaker is set as :
Upstream breaker pickup > downstream breaker pickup
Upstream breaker pickup < downstream breaker pickup
Upstream breaker pickup = downstream breaker pickup
Upstream breaker pickup <= downstream breaker pickup
Question 13 of 18
In TCCs, for selectivity purposes on the basis of pickup setting:
The upstream breaker curve is located to right of the downstream breaker curve
The upstream breaker curve is located to the light of the downstream breaker curve
The upstream breaker curve is located lower to the downstream breaker curve
Question 14 of 18
From the selective perspective, time delay of upstream breaker should be:
Greater than downstream breaker
Less than downstream breaker
Equal to downstream breaker
Less than or equals to downstream breaker
Question 15 of 18
For accurate selective coordination, TCCs should line up in from left to right or bottom to top in the sequence of:
Source to load
Load to source
Can be both (a) and (b)
Question 16 of 18
Fuse TCCs consist of how many line bands?
One
Two
Three
Four
Question 17 of 18
Cable damage curve is always
to the left of circuit breaker TCCs
to the right of circuit breaker TCCs
in the middle of circuit breaker TCCs
No effect of cable damage curve on protective device
Question 18 of 18
Transformer inrush curve is always
to the left and below of circuit breaker TCCs
to the right and above of circuit breaker TCCs
no effect of transformer inrush curve on protective device