Overview
The “Directional negative sequence protection with current independent time delay” function serves as the backup short-circuit protection for unbalanced faults. With the negative-sequence system, various supervision and protection tasks can be realized.
For more detailed information on “Directional negative sequence protection with current independent time delay” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
Setting parameters of the Function
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:101 | General:Angle forward α | 0 ° to 360 ° | 338 ° | |
| _:2311:102 | General:Angle forward β | 0 ° to 360 ° | 122 ° | |
| _:2311:107 | General:Min. neg.-seq. voltage V2 | 0.150 V to 34.000 V | 1.213 V | |
| _:2311:106 | General:Min. neg.-seq. current I2 | 1 A @ 100 Irated | 0.030 A to 10.000 A | 0.050 A |
| 5 A @ 100 Irated | 0.15 A to 50.00 A | 0.25 A | ||
| 1 A @ 50 Irated | 0.030 A to 10.000 A | 0.050 A | ||
| 5 A @ 50 Irated | 0.15 A to 50.00 A | 0.25 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.050 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 0.250 A | ||
| Definite-T 1 | ||||
| _:8101:1 | Definite-T 1:Mode | off on test |
off | |
| _:8101:2 | Definite-T 1:Operate & flt.rec. blocked | no yes |
no | |
| _:8101:114 | Definite-T 1:Directional mode | non-directional forward reverse |
forward | |
| _:8101:111 | Definite-T 1:Stabiliz. w. phase current | 0 % to 30 % | 10 % | |
| _:8101:3 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.500 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 7.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.500 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 7.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.500 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 7.500 A | ||
| _:8101:6 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.30 s | |
| _:8101:116 | Definite-T 1:Blk. w. inrush curr. detect. | no yes |
no | |
| _:8101:130 | Definite-T 1:Blocking by prot. pickup | every pickup 1-phase pickup multi-phase pickup no pickup |
every pickup | |
| _:8101:129 | Definite-T 1:Op.mode at 1p dead time | blocked non-directional |
blocked | |
| _:8101:112 | Definite-T 1:Hold mode 1p dead time | 0.000 s to 60.000 s | 0.040 s | |
| _:8101:140 | Definite-T 1:Blocking by | Setting options depend on configuration | ||
Logic Diagrams & highlights
Stage Control of the Directional Negative-Sequence Protection
Logic Diagram of the Function Directional Negative-Sequence System Protection with Current-Independent Time Delay
Stabilization with Phase Currents
Phasor Diagram for Direction Determination with Negative-Sequence System Values
Logic of Direction Determination
