Overview
Zero sequence components are present in all abnormal conditions involving earth. They have a considerably high value during earth faults. The “Zero sequence overcurrent protection” is a definite time stage comparator function.
For more detailed information on “Zero 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 |
| Zero sequence overcurrent protection | LCZSPTOC | – | 51N |
Signals & Setting Parameters
LCZSPTOC Function block
LCZSPTOC Input signals
| LCZSPTOC 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 output |
LCZSPTOC Output signals
| LCZSPTOC Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | Trip signal for zero sequence over current protection | |
| START | BOOLEAN | Start signal for zero sequence over current protection | |
LCZSPTOC Group settings (basic)
| LCZSPTOC Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off/On |
| 3I0> | 3 – 2500 | %IB | 1 | 100 | Zero sequence over current start value in % of IBase |
| t3I0 | 0.000 – 60.000 | s | 0.001 | 0.000 | Time delay to operate |
LCZSPTOC Non group settings (basic)
| LCZSPTOC 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 |
LCZSPTOC Monitored data
| LCZSPTOC Monitored data | ||||
| Name | Type | Values (Range) | Unit | Description |
| 3I0 | Real | – | A | Zero sequence current value |
Technical Data
LCZSPTOC technical data
