2. Overcurrent I >1 function: Operating time test (IDMT /DT curve)
For IDMT curve testing : Set I>1 = 100% TMS = 1.0
For DT curve testing : Set I>1 = 100% Time delay =1.0 sec
Note: You can use only one CT input and operating curves which is relevant to your
requirement.
Injected current Operating Time
For 1A
relay
For 5A
relay
IEC E
Inverse
IEC V
Inverse
IEC S
Inverse1
IEC S
Inverse2
DT
R Phase 5 In 5A 25A
Y Phase 5 In 5A 25A
B Phase 5 In 5A 25A
For IDMT curve testing : Set I>1 = 100% TMS = 0.1
For DT curve testing : Set I>1 = 100% Time delay =0.05 sec
Note: IDMT operating time should be 1/10 of above observed timing.
Injected current Operating Time
For 1A
relay
For 5A
relay
IEC E
Inverse
IEC V
Inverse
IEC S
Inverse1
IEC S
Inverse2
DT
R Phase 5 In 5A 25A
Y Phase 5 In 5A 25A
B Phase 5 In 5A 25A
2.2.10.2 Testing of Earth Fault Protection
1. Earth fault IN>1 function: Pickup test
I>1 Setting EF input Limit value (amp)
1A 5A 1A 5A
20% Min Max Min Max
2. Earth Fault IN >1 function: Operating time test (IDMT /DT curve)
To Next Page
Loading...
