ADR233B
Ref ID : ADR233B/IM/SS
Rev No. : 05
Page No. : 178 of 479
Note : Residual OC setting for 3I0>2 & 3I0>3 of winding 1 and Residual OC settings for 3I0>1, 3I0>2 &
3I0>3 of Winding 2 are similar to Residual OC 3I0>1 settings.
6.8.7 Sequence OC (W1 & W2)
Sr. No Parameter Defaults setting Settings / Ranges
1. Seq.I>1 Enable +Seq OFF/+Seq/-Seq
This setting is used to set the desired Phase sequence over current protection function either Negative
or Positive.
2. Seq.I>1 Curve IEC S Inverse Definite Time / IEC S Inverse / ST
Inverse 1.3S / 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 shows the tripping characteristic for the first stage of Negative Phase sequence over
current element.
3. Seq.I>1 1.00 A*In IDMT: 0.1A to
DT:0.5A to 15A in step of 0.1
This setting shows Pick-up setting for first stage of Negative Phase sequence over current element.
4. tSeq.I>1 DT Delay 1.00 S 0 to 1899.9 s in step 0.01s
This setting is to set the time-delay for the Definite Time (DT) setting
5. Seq.I>1 TMS 1.000 0.01 to 1.5 in step of 0.01
This setting for the time multiplier setting to adjust the operating time of the IEC / UK IDMT
characteristic.
6. Seq.I>1 Time Dial 1.00 0.01 to 100.00 in step of 0.01
These settings for the time dial setting to adjust the operating time of the IEEE / US IDMT characteristic.
7. Seq.I>1 D/O Char DT IDMT/DT
This setting shows the reset/release characteristic.
8. tSeq.I>1 tD/O Delay 1.00 S 0s to 100s in step of 0.01s
This setting shows the reset/release time for Definite Time (DT) and all IDMT curve
9. Seq.I>1 D/O TMS 1.000 0.025 to 1.2 in step of 0.005
This setting shows the reset/release time multiplier setting for IEEE IDMT characteristic
10. Seq.I>1 2H BLK Disabled Enabled / Disabled
This setting shows the enable (activate) or disable (turn off) the first stage Negative Phase sequence
over current element to block the trip command in presence of inrush current.
If Seq.I>1 Blocking and 2nd Harmonic both setting are enable.
This function block the (3I0>1) trip command in case 2nd harmonics/fundamental in any phase is above
the 2H Thresh and fundamental current is below I> UB2H setting (set in Inrush Blocking Menu.)
11. Seq.I>1 2H Thresh 20 % 5 % to 70% in step of 1%
This setting is to specify the 2nd Harm Threshold value, if the level of 2nd harmonic/fundamental in any
neutral current exceeds the setting, the protection function which is enabled with this function will be
blocked.
12. Seq.I>1 UB2H 4 A *In 4 to 32*In in step of 0.01*In
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