Overview
The ZCRWPSCH function provides the “Current reversal and weak end infeed logic” functions that supplement the standard scheme communication logic. It is not suitable for standalone use as it requires inputs from the distance protection functions and the scheme communications function included within the terminal.
For more detailed information on “Current reversal and weak end infeed logic” functions, 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 distance protection 3-phase | ZCRWPSCH | – | 85 |
Signals & Setting Parameters
ZCRWPSCH function block
ZCRWPSCH Input signals
| ZCRWPSCH 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 |
ZCRWPSCH Output signals
| ZCRWPSCH Output signals | |||
| Name | Type | Description | |
| IRVL | BOOLEAN | Operation of current reversal logic | |
| TRWEI | BOOLEAN | Trip signal from weak end infeed logic | |
| TRWEIL1 | BOOLEAN | Trip signal from weak end infeed logic in phase L1 | |
| TRWEIL2 | BOOLEAN | Trip signal from weak end infeed logic in phase L2 | |
| TRWEIL3 | BOOLEAN | Trip signal from weak end infeed logic in phase L3 | |
| ECHO | BOOLEAN | Carrier send by WEI logic | |
ZCRWPSCH Group settings (basic)
| ZCRWPSCH 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 | 0.010 | Coordination time for the WEI logic |
| UPP< | 10 – 90 | %UB | 1 | 70 | Phase to Phase voltage for detection of fault condition |
| UPN< | 10 – 90 | %UB | 1 | 70 | Phase to Neutral voltage for detection of fault condition |
ZCRWPSCH Non group settings (basic)
| ZCRWPSCH 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
