Overview
The “Instantaneous residual overcurrent protection (EFPIOC)” function has a low transient overreach and short tripping times to allow the use for instantaneous earth-fault protection, with the reach limited to less than the typical eighty percent of the line at minimum source impedance.
EFPIOC is configured to measure the residual current from the three-phase current inputs and can be configured to measure the current from a separate current input.
For more detailed informationon “Instantaneous residual overcurrent protection (EFPIOC)” function, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
EFPIOC Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| Instantaneous residual overcurrent protection | EFPIOC | IN>> | 50N |
Signals & Setting Parameters
EFPIOC function block
EFPIOC Input signals
| EFPIOC Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Three phase currents |
| BLOCK | BOOLEAN | 0 | Block of function |
| BLKAR | BOOLEAN | 0 | Block input for auto reclose |
| ENMULT | BOOLEAN | 0 | Enable current multiplier |
EFPIOC Output signals
| EFPIOC Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | Trip signal | |
EFPIOC Group settings (basic)
| EFPIOC Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off / On |
| IN>> | 5 – 2500 | %IB | 1 | 200 | Operate residual current level in % of IBase |
EFPIOC Group settings (advanced)
| EFPIOC Group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| IN>>Min | 5 – 2500 | %IB | 1 | 5 | Minimum used operate residual current level in % of IBase, if IN>> is less than IN>>Min then IN>> is set to IN>>Min |
| IN>>Max | 5 – 2500 | %IB | 1 | 2500 | Maximum used operate residual current level in % of IBase, if IN>> is greater than IN>>Max then IN>> is set to IN>>Max |
| StValMult | 0.5 – 5.0 | – | 0.1 | 1.0 | Multiplier for operate current level |
EFPIOC Non group settings (basic)
| EFPIOC 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 |
EFPIOC Monitored data
| EFPIOC Monitored data | ||||
| Name | Type | Values (Range) | Unit | Description |
| IN | REAL | – | A | Residual current |
Logics & highlights
Logic for limitation of used operation current value
