Overview
Negative sequence components are present in all types of fault condition. They can reach considerably high values during abnormal operation. The “Negative sequence overcurrent protection” is a definite time stage comparator function.
For more detailed information on “Negative sequence overcurrent protection” function, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
Function Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| Negative sequence overcurrent protection | LCNSPTOC | – | 46 |
Signals & Setting Parameters
LCNSPTOC Function block
LCNSPTOC Input signals
| LCNSPTOC Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Three phase group signal for current inputs |
| BLOCK | BOOLEAN | 0 | Block overall function |
| BLKTR | BOOLEAN | 0 | Block trip signal |
LCNSPTOC Output signals
| LCNSPTOC Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | Trip signal negative sequence over current protection | |
| START | BOOLEAN | Start signal for negative sequence over current protection | |
LCNSPTOC Group settings (basic)
| LCNSPTOC Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off/On |
| I2> | 3 – 2500 | %IB | 1 | 100 | Negative sequence over current start value in % of IBase |
| tI2 | 0.000 – 60.000 | s | 0.001 | 0.000 | Time delay to operate |
LCNSPTOC Non group settings (basic)
| LCNSPTOC Non group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| GlobalBaseSel | 1 – 12 | – | 1 | 1 | Selection of one of the Global Base Value groups |
LCNSPTOC Monitored data
| LCNSPTOC Monitored data | ||||
| Name | Type | Values (Range) | Unit | Description |
| I2 | Real | – | A | Neagative sequence current value |
Technical Data
LCNSPTOC technical data
