Overview
The “Overcurrent protection, Ground” function detects short circuits in electrical equipment. It can be used as backup or emergency overcurrent protection in addition to the main protection.
For more detailed information on “Overcurrent protection, Ground” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function Overcurrent Protection, Ground – Advanced

Structure/Embedding of the Function Overcurrent Protection, Ground – Basic

Setting Parameters
General setting parameters
Addr. | Parameter | C | Setting Options | Default Setting |
General | ||||
_:2311:9 | General:Measured value | 3I0 calculated IN measured |
IN measured | |
Setting parameters for Stage with Definite-Time Characteristic Curve
Addr. | Parameter | C | Setting Options | Default Setting |
General | ||||
_:751:1 | Definite-T 1:Mode | off on test |
off | |
_:751:2 | Definite-T 1:Operate & flt.rec. blocked | no yes |
no | |
_:751:26 | Definite-T 1:Dynamic settings | no yes |
no | |
_:751:27 | Definite-T 1:Blk. w. inrush curr. detect. | no yes |
no | |
_:751:102 | Definite-T 1:Blk. w. 2nd harm. gnd. det. | no yes |
no | |
_:751:8 | Definite-T 1:Method of measurement | fundamental comp. RMS value |
fundamental comp. | |
_:751:3 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:4 | Definite-T 1:Dropout ratio | 0.90 to 0.99 | 0.95 | |
_:751:101 | Definite-T 1:Dropout delay | 0.00 s to 60.00 s | 0.00 s | |
_:751:6 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Dyn.s: AR off/n.rdy | ||||
_:751:28 | Definite-T 1:Effect. by AR off/n.ready | no yes |
no | |
_:751:35 | Definite-T 1:Stage blocked | no yes |
no | |
Dyn.set: AR cycle 1 | ||||
_:751:29 | Definite-T 1:Effected by AR cycle 1 | no yes |
no | |
_:751:36 | Definite-T 1:Stage blocked | no yes |
no | |
_:751:14 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:20 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Dyn.set: AR cycle 2 | ||||
_:751:30 | Definite-T 1:Effected by AR cycle 2 | no yes |
no | |
_:751:37 | Definite-T 1:Stage blocked | no yes |
no | |
_:751:15 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:21 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Dyn.set: AR cycle 3 | ||||
_:751:31 | Definite-T 1:Effected by AR cycle 3 | no yes |
no | |
_:751:38 | Definite-T 1:Stage blocked | no yes |
no | |
_:751:16 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:22 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Dyn.s: AR cycle>3 | ||||
_:751:32 | Definite-T 1:Effected by AR cycle gr. 3 | no yes |
no | |
_:751:39 | Definite-T 1:Stage blocked | no yes |
no | |
_:751:17 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:23 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Dyn.s: Cold load PU | ||||
_:751:33 | Definite-T 1:Effect. b. cold-load pickup | no yes |
no | |
_:751:40 | Definite-T 1:Stage blocked | no yes |
no | |
_:751:18 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:24 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Dyn.set: bin.input | ||||
_:751:34 | Definite-T 1:Effected by binary input | no yes |
no | |
_:751:41 | Definite-T 1:Stage blocked | no yes |
no | |
_:751:19 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:751:25 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
Setting parameters for Stage with Inverse-Time Characteristic Curve
Addr. | Parameter | C | Setting Options | Default Setting |
General | ||||
_:781:1 | Inverse-T 1:Mode | off on test |
off | |
_:781:2 | Inverse-T 1:Operate & flt.rec. blocked | no yes |
no | |
_:781:26 | Inverse-T 1:Dynamic settings | no yes |
no | |
_:781:27 | Inverse-T 1:Blk. w. inrush curr. detect. | no yes |
no | |
_:781:111 | Inverse-T 1:Blk. w. 2nd harm. gnd. det. | no yes |
no | |
_:781:8 | Inverse-T 1:Method of measurement | fundamental comp. RMS value |
fundamental comp. | |
_:781:3 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:108 | Inverse-T 1:Type of char- acter. curve | |||
_:781:113 | Inverse-T 1:Min. time of the curve | 0.00 s to 1.00 s | 0.00 s | |
_:781:109 | Inverse-T 1:Reset | instantaneous disk emulation |
disk emulation | |
_:781:101 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
_:781:115 | Inverse-T 1:Additional time delay | 0.00 s to 60.00 s | 0.00 s | |
Dyn.s: AR off/n.rdy | ||||
_:781:28 | Inverse-T 1:Effect. by AR off/n.ready | no yes |
no | |
_:781:35 | Inverse-T 1:Stage blocked | no yes |
no | |
Dyn.set: AR cycle 1 | ||||
_:781:29 | Inverse-T 1:Effected by AR cycle 1 | no yes |
no | |
_:781:36 | Inverse-T 1:Stage blocked | no yes |
no | |
_:781:14 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:102 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
Dyn.set: AR cycle 2 | ||||
_:781:30 | Inverse-T 1:Effected by AR cycle 2 | no yes |
no | |
_:781:37 | Inverse-T 1:Stage blocked | no yes |
no | |
_:781:15 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:103 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
Dyn.set: AR cycle 3 | ||||
_:781:31 | Inverse-T 1:Effected by AR cycle 3 | no yes |
no | |
_:781:38 | Inverse-T 1:Stage blocked | no yes |
no | |
_:781:16 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:104 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
Dyn.s: AR cycle>3 | ||||
_:781:32 | Inverse-T 1:Effected by AR cycle gr. 3 | no yes |
no | |
_:781:39 | Inverse-T 1:Stage blocked | no yes |
no | |
_:781:17 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:105 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
Dyn.s: Cold load PU | ||||
_:781:33 | Inverse-T 1:Effect. b. cold-load pickup | no yes |
no | |
_:781:40 | Inverse-T 1:Stage blocked | no yes |
no | |
_:781:18 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:106 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
Dyn.set: bin.input | ||||
_:781:34 | Inverse-T 1:Effected by binary input | no yes |
no | |
_:781:41 | Inverse-T 1:Stage blocked | no yes |
no | |
_:781:19 | Inverse-T 1:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:781:107 | Inverse-T 1:Time dial | 0.00 to 15.00 | 1.00 | |
Setting parameters for Stage with User-Defined Characteristic Curve
Addr. | Parameter | C | Setting Options | Default Setting |
General | ||||
_:1 | User curve #:Mode | off on test |
off | |
_:2 | User curve #:Operate & flt.rec. blocked | no yes |
no | |
_:26 | User curve #:Dynamic settings | no yes |
no | |
_:27 | User curve #:Blk. w. inrush curr. detect. | no yes |
no | |
_:111 | User curve #:Blk. w. 2nd harm. gnd. det. | no yes |
no | |
_:8 | User curve #:Method of measurement | fundamental comp. RMS value |
fundamental comp. | |
_:3 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:113 | User curve #:Threshold (absolute) | 1 A @ 100 Irated | 0.000 A to 35.000 A | 0.000 A |
5 A @ 100 Irated | 0.00 A to 175.00 A | 0.00 A | ||
1 A @ 50 Irated | 0.000 A to 35.000 A | 0.000 A | ||
5 A @ 50 Irated | 0.00 A to 175.00 A | 0.00 A | ||
1 A @ 1.6 Irated | 0.000 A to 1.600 A | 0.000 A | ||
5 A @ 1.6 Irated | 0.000 A to 8.000 A | 0.000 A | ||
_:110 | User curve #:Reset | instantaneous disk emulation |
disk emulation | |
_:101 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
_:115 | User curve #:Additional time delay | 0.00 s to 60.00 s | 0.00 s | |
Dyn.s: AR off/n.rdy | ||||
_:28 | User curve #:Effect. by AR off/n.ready | no yes |
no | |
_:35 | User curve #:Stage blocked | no yes |
no | |
Dyn.set: AR cycle 1 | ||||
_:29 | User curve #:Effected by AR cycle 1 | no yes |
no | |
_:36 | User curve #:Stage blocked | no yes |
no | |
_:14 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:102 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
Dyn.set: AR cycle 2 | ||||
_:30 | User curve #:Effected by AR cycle 2 | no yes |
no | |
_:37 | User curve #:Stage blocked | no yes |
no | |
_:15 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:103 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
Dyn.set: AR cycle 3 | ||||
_:31 | User curve #:Effected by AR cycle 3 | no yes |
no | |
_:38 | User curve #:Stage blocked | no yes |
no | |
_:16 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:104 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
Dyn.s: AR cycle>3 | ||||
_:32 | User curve #:Effected by AR cycle gr. 3 | no yes |
no | |
_:39 | User curve #:Stage blocked | no yes |
no | |
_:17 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:105 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
Dyn.s: Cold load PU | ||||
_:33 | User curve #:Effect. b. cold-load pickup | no yes |
no | |
_:40 | User curve #:Stage blocked | no yes |
no | |
_:18 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:106 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
Dyn.set: bin.input | ||||
_:34 | User curve #:Effected by binary input | no yes |
no | |
_:41 | User curve #:Stage blocked | no yes |
no | |
_:19 | User curve #:Threshold | 1 A @ 100 Irated | 0.010 A to 35.000 A | 1.200 A |
5 A @ 100 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 50 Irated | 0.010 A to 35.000 A | 1.200 A | ||
5 A @ 50 Irated | 0.05 A to 175.00 A | 6.00 A | ||
1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.200 A | ||
5 A @ 1.6 Irated | 0.002 A to 8.000 A | 6.000 A | ||
_:107 | User curve #:Time dial | 0.05 to 15.00 | 1.00 | |
Logic Diagrams & highlights
Logic Diagram of Measured-Value Selection

Threshold Setting Range

Logic Diagram of the Definite-Time Overcurrent Protection (Ground) – Basic

Logic Diagram of the Definite-Time Overcurrent Protection (Ground) – Advanced

Logic Diagram of the Inverse-Time Overcurrent Protection (Ground) – Basic

Logic Diagram of the Inverse-Time Overcurrent Protection (Ground) – Advanced

Minimum Operating Time of the Curve

Pickup Behavior and Dropout Behavior when Using a User-Defined Characteristic Curve

Part-Logic Diagram on the Influence of Inrush-Current Detection Exemplified by the 1st Definite-Time Overcurrent Protection Stage

Principle of the Dynamic Settings in the Example of 1st Definite-Time Overcurrent Protection

Influence of the AREC Signals on the Overcurrent-Protection Stage

Influence of the Cold-Load Pickup Detection on the Overcurrent-Protection Stage

Influence of the Binary Input on the Overcurrent-Protection Stage
