Overview
The “Negative sequence protection” function detects 1-phase or 2-phase short circuits in the electrical power system with clearly increased sensitivity compared to the classical overcurrent protection, protects electric machines during excessive unbalanced load, reports unbalanced load conditions in the electricity supply system, detects phase interruptions in the primary system, and locates short circuits or inversions in the connections to the current transformers.
For more detailed information on “Negative sequence protection” 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 for Stage with Definite-Time Characteristic Curve
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:106 | General:Reference value | pos. seq. current rated current |
rated current | |
| _:2311:107 | General:Current limita- tion Imax | no yes |
no | |
| _:2311:101 | General:Maximum phase current | 1 A @ 100 Irated | 0.030 A to 35.000 A | 10.000 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 50.00 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 10.000 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 50.00 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 10.000 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 50.000 A | ||
| _:2311:104 | General:Release current | 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 | ||||
| _:1981:1 | Definite-T 1:Mode | off on test |
off | |
| _:1981:2 | Definite-T 1:Operate & flt.rec. blocked | no yes |
no | |
| _:1981:3 | Definite-T 1:Threshold | 5.0 % to 999.9 % | 10.0 % | |
| _:1981:4 | Definite-T 1:Dropout ratio | 0.40 to 0.99 | 0.95 | |
| _:1981:104 | Definite-T 1:Blk. w. inrush curr. detect. | no yes |
no | |
| _:1981:101 | Definite-T 1:Dropout delay | 0.00 s to 60.00 s | 0.00 s | |
| _:1981:6 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 1.50 s | |
| Definite-T 2 | ||||
| _:1982:1 | Definite-T 2:Mode | off on test |
off | |
| _:1982:2 | Definite-T 2:Operate & flt.rec. blocked | no yes |
no | |
| _:1982:3 | Definite-T 2:Threshold | 5.0 % to 999.9 % | 65.0 % | |
| _:1982:4 | Definite-T 2:Dropout ratio | 0.40 to 0.99 | 0.95 | |
| _:1982:104 | Definite-T 2:Blk. w. inrush curr. detect. | no yes |
no | |
| _:1982:101 | Definite-T 2:Dropout delay | 0.00 s to 60.00 s | 0.00 s | |
| _:1982:6 | Definite-T 2:Operate delay | 0.00 s to 60.00 s | 0.50 s | |
Setting parameters for Stage with Inverse-Time Characteristic Curve
| Addr. | Parameter | C | Setting Options | Default Setting |
| Inverse-T # | ||||
| _:1 | Inverse-T #:Mode | off on test |
off | |
| _:2 | Inverse-T #:Operate & flt.rec. blocked | no yes |
no | |
| _:3 | Inverse-T #:Threshold | 5.0 % to 999.9 % | 10.0 % | |
| _:104 | Inverse-T #:Blk. w. inrush curr. detect. | no yes |
no | |
| _:105 | Inverse-T #:Type of character. curve | |||
| _:106 | Inverse-T #:Reset | instantaneous disk emulation |
disk emulation | |
| _:107 | Inverse-T #:Time dial | 0.05 to 15.00 | 1.00 | |
Logic Diagrams & highlights
Logic Diagram of the General Functionality
Logic Diagram of the Stage Negative-Sequence Protection with Definite-Time Characteristic Curve
Logic Diagram of the Negative-Sequence Protection with Inverse-Time Characteristic Curve
