Overview
The “Positive sequence overcurrent protection” function detects short circuits in electric equipment. It can be applied when the zero-sequence current or negative-sequence current should not influence the tripping, for example, on the tertiary delta winding of an auto transformer.
For more detailed information on “Positive sequence overcurrent 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 |
| Definite-T 1 | ||||
| _:20581:1 | Definite-T 1:Mode | off on test |
off | |
| _:20581:2 | Definite-T 1:Operate & flt.rec. blocked | no yes |
no | |
| _:20581:3 | Definite-T 1:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.200 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 6.00 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.200 A | ||
| 5 A @ 50 Irated | 0.15 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 | 0.005 A to 8.000 A | 6.000 A | ||
| _:20581:104 | Definite-T 1:Blk. w. inrush curr. detect. | no yes |
no | |
| _:20581:6 | Definite-T 1:Operate delay | 0.00 s to 60.00 s | 0.50 s | |
| Definite-T 2 | ||||
| _:20582:1 | Definite-T 2:Mode | off on test |
off | |
| _:20582:2 | Definite-T 2:Operate & flt.rec. blocked | no yes |
no | |
| _:20582:3 | Definite-T 2: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 | ||
| _:20582:104 | Definite-T 2:Blk. w. inrush curr. detect. | no yes |
no | |
| _:20582:6 | 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 | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.200 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 6.00 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.200 A | ||
| 5 A @ 50 Irated | 0.15 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 | 0.005 A to 8.000 A | 6.000 A | ||
| _:104 | Inverse-T #:Blk. w. inrush curr. detect. | no yes |
no | |
| _:105 | Inverse-T #:Type of character. curve | ANSI long-time inv. ANSI short-time inv. ANSI extremely inv. ANSI very inverse ANSI normal inverse ANSI moderately inv. ANSI definite inverse IEC normal inverse IEC very inverse IEC extremely inv. IEC long-time inverse |
IEC normal inverse | |
| _: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 Stage Definite-Time Positive-Sequence Overcurrent Protection
Application Example: Auto Transformer with Tertiary Delta Winding
Logic Diagram of the Inverse-Time Positive-Sequence Overcurrent Protection
