Backup Overcurrent Protection; Overcurrent 1 Settings - GE MiCOM P747 Agile Technical Manual

Chapter 5 - Protection Functions
5

BACKUP OVERCURRENT PROTECTION

Back-up overcurrent protection is disabled by default but can be enabled for additional protection. The
product provides two stages of independent overcurrent protection for each terminal, up to the maximum of
18 terminals. For each terminal, the first stage can be programmed as definite time (DT) or inverse definite
minimum time (IDMT). For IDMT protection, the product provides a choice of curves (IEC, UK, IEEE, and
US). The second stage provides definite time overcurrent protection. In the CONFIGURATION column, set
Overcurrent to Enabled. The overcurrent settings then appear in the GROUP X OVERCURRENT column
(terminals 1-6), and GROUP X OVERCURRENT 2 column (terminals 7-18).
5.1

OVERCURRENT 1 SETTINGS

Menu Text
GROUP 1
OVERCURRENT 1
This column contains settings for Overcurrent
Terminal 1
This column contains overcurrent settings for Terminal 1
I>1 Function
This setting determines the tripping characteristic for the first stage overcurrent element.
I>1 Current Set
This sets the pick-up threshold for the first stage overcurrent element.
I>1 Time Delay
This sets the DT time delay for the first stage overcurrent element.
I>1 TMS
This is the Time Multiplier Setting to adjust the operate time of IEC IDMT curves.
I>1 Time Dial
This is the Time Multiplier Setting to adjust the operate time of IEEE/US IDMT curves.
I>1 K (RI)
This setting defines the TMS constant to adjust the operate time of the RI curve.
I>1 Reset Char
This setting determines the type of Reset characteristic used for the IEEE/US curves.
I>1 tRESET
This setting determines the Reset time for the Definite Time Reset characteristic.
I>2 Function
116
Col Row
35 00
35 01
35 02 IEC S Inverse
35 04 1.0*I1
35 05 1
35 06 1
35 07 1
35 08 1
35 09 DT
35 0A 0
35 0B Disabled
Default Setting
Description
0 = Disabled
1 = DT (DT)
2 = IEC S Inverse (TMS)
3 = IEC V Inverse (TMS)
4 = IEC E Inverse (TMS)
5 = UK LT Inverse (TMS)
6 = Rectifier (TMS)
7 = RI (K)
8 = IEEE M Inverse (TD)
9 = IEEE V Inverse (TD)
10 = IEEE E Inverse (TD)
11 = US Inverse (TD)
12 = US ST Inverse (TD)
From 0.08*I1 to 4.0*I1 step 0.01*I1
From 0 to 100 step 0.01
From 0.025 to 1.2 step 0.025
From 0.01 to 100 step 0.01
From 0.1 to 10 step 0.05
0 = DT
1 = Inverse
From 0 to 100 step 0.01
0 = Disabled
1 = DT (DT)
MiCOM P747
Available Options
P747-TM-EN-1
P747-TM-EN-1.1