Overview
The “Current reversal and weak-end infeed logic for residual overcurrent protection (ECRWPSCH)” is a supplement to Scheme communication logic for residual overcurrent protection ECPSCH. To achieve fast fault clearing for all earth faults on the line, the directional earth fault protection function can be supported with logic that uses tele-protection channels.
For more detailed information on “Current reversal and weak-end infeed logic for residual overcurrent protection (ECRWPSCH)”, 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 |
| Current reversal and weak-end infeed logic for residual overcurrent protection | ECRWPSCH | – | 85 |
Signals & Setting Parameters
ECRWPSCH function block
ECRWPSCH Input signals
| ECRWPSCH Input signals | |||
| Name | Type | Default | Description |
| U3P | GROUP SIGNAL | – | Group signal for voltage input |
| BLOCK | BOOLEAN | 0 | Block of function |
| IRVBLK | BOOLEAN | 0 | Block of current reversal function |
| IRV | BOOLEAN | 0 | Activation of current reversal logic |
| WEIBLK1 | BOOLEAN | 0 | Block of WEI Logic |
| WEIBLK2 | BOOLEAN | 0 | Block of WEI logic due to operation of other protections |
| VTSZ | BOOLEAN | 0 | Block of trip from WEI logic through fuse-failure function |
| CBOPEN | BOOLEAN | 0 | Block of trip from WEI logic by an open breaker |
| CRL | BOOLEAN | 0 | POR Carrier receive for WEI logic |
ECRWPSCH Output signals
| ECRWPSCH Output signals | |||
| Name | Type | Description | |
| IRVL | BOOLEAN | Operation of current reversal logic | |
| TRWEI | BOOLEAN | Trip signal from weak end infeed logic | |
| ECHO | BOOLEAN | Permissive signal transmitted as echo signal or in case of weak end infeed | |
ECRWPSCH Group settings (basic)
| ECRWPSCH Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| CurrRev | Off On |
– | – | Off | Operating mode of Current Reversal Logic |
| tPickUpRev | 0.000 – 60.000 | s | 0.001 | 0.020 | Pickup time for current reversal logic |
| tDelayRev | 0.000 – 60.000 | s | 0.001 | 0.060 | Time Delay to prevent Carrier send and local trip |
| WEI | Off Echo Echo & Trip |
– | – | Off | Operating mode of WEI logic |
| tPickUpWEI | 0.000 – 60.000 | s | 0.001 | 0.000 | Coordination time for the WEI logic |
| 3U0> | 5 – 70 | %UB | 1 | 25 | Neutral voltage setting for fault conditions measurement |
ECRWPSCH Non group settings (basic)
| ECRWPSCH 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 |
Logics & highlights
Simplified logic diagram for current reversal
Simplified logic diagram for weak-end infeed logic – Echo
Simplified logic diagram for weak-end infeed logic – Echo & Trip
