7 Protection Parameter Settings
1. I2>3 Function IEC S Inverse
Disabled / DT / IEC S Inverse / S Inverse
(1.3Sec) / IEC V Inverse / IEC E Inverse / UK
LT Inverse / IEEE M Inverse / IEEE V Inverse
/ IEEE E Inverse / US Inverse / US ST
Inverse
This setting determines the tripping characteristic for the third stage Negative sequence overcurrent element.
2. I2>3 Current Set 1.00*In
If DT 1.0 to 35.00*In step 0.01*In
If IDMT 0.10 to 4.00*In step 0.01*In
This setting determines the pick-up setting for second third Negative sequence overcurrent element.
3. I2>3 Time Delay 1.00 S 0s to 200s step 0.01s
This setting determines the time-delay for the definite time setting if selected for third stage Negative sequence overcurrent element.
This time multiplier setting is used to adjust the operating time of the IEC / UK IDMT characteristic.
5. I2>3 Time Dial 1.00 0.01 to 100 step 0.01s
This time multiplier setting is used to adjust the operating time of the IEEE / US IDMT curves.
6. tRESET Function DT DT/IDMT
This setting determines the type of reset/release characteristics. IDMT applicable for IEEE curves only.
This setting determines the reset/release time for IEEE IDMT characteristic
8. I2>3 tRESET 1.00 S 0s to 100s step 0.01s
This setting determines the reset/release time for Definite Time (DT) and all IDMT curve
This setting determines the enabling/disabling of blocking third stage Negative sequence overcurrent element due to presence of inrush
current.
If I2>3 Blocking and 2nd Harmonic setting are enabled, then (I2>3) trip command will be blocked in case 2nd harmonics content in any
phase is above the 2ndHarm Thresh. and fundamental current is below I> lift 2H setting . (Set in SYSTEM CONFIG Menu.)
2.12.9 BROKEN CONDUCTOR Settings
Sr. No Parameter Defaults setting Setting / Ranges
1. BC Alarm Disabled Disabled / Enabled
This setting enables (activate) or disables (turn off) the Broken Conductor alarm.
2. I2/I1 Set-1 0.50 0.20 to 1.00 step 0.01
This setting determines the pick-up threshold of the negative to positive sequence current ratio for Broken Conductor alarm.
This setting sets the time delay for the Broken Conductor alarm.
4. BC Trip Disabled Disabled / Enabled
This setting enables (activate) or disables (turn off) the Broken Conductor Trip function
5. I2/I1 Set-2 0.50 0.20 to 1.00 step 0.01
This setting determines the pick-up threshold of the negative to positive sequence current ratio for Broken Conductor Trip.
This setting sets the time delay for Broken Conductor Trip.
2.12.10 CB FAIL Settings
1. CB Fail Status Enabled Disabled / Enabled
This setting enables (activate) or disables (turn off) the CB Fail Status