Overview
To achieve fast clearing of faults on the whole line, when no communication channel is available, the “Local acceleration logic (ZCLCPSCH)” can be used. This logic enables fast fault clearing and reclosing during certain conditions, but naturally, it can not fully replace a communication channel.
For more detailed information on “Local acceleration logic (ZCLCPSCH)”, 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 |
| Local acceleration logic | ZCLCPSCH | – | – |
Signals & Setting Parameters
ZCLCPSCH function block
ZCLCPSCH Input signals
| ZCLCPSCH Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Group signal for current input |
| BLOCK | BOOLEAN | 0 | Block of function |
| ARREADY | BOOLEAN | 0 | Autoreclosure ready, releases function used for fast trip |
| NDST | BOOLEAN | 0 | Non directional criteria used to prevent instantaneous trip |
| EXACC | BOOLEAN | 0 | Connected to function used for tripping at zone extension |
| BC | BOOLEAN | 0 | Breaker Close |
| LLACC | BOOLEAN | 0 | Connected to function used for tripping at loss of load |
ZCLCPSCH Output signals
| ZCLCPSCH Output signals | |||
| Name | Type | Description | |
| TRZE | BOOLEAN | Trip by zone extension | |
| TRLL | BOOLEAN | Trip by loss of load | |
ZCLCPSCH Group settings (basic)
| ZCLCPSCH Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off / On |
| LoadCurr | 1 – 100 | %IB | 1 | 10 | Load current before disturbance in % of IBase |
| LossOfLoad | Off On |
– | – | Off | Enable/Disable operation of Loss of load. |
| ZoneExtension | Off On |
– | – | Off | Enable/Disable operation of Zone extension |
| MinCurr | 1 – 100 | %IB | 1 | 5 | Lev taken as curr loss due to remote CB trip in % of IBase |
| tLowCurr | 0.000 – 60.000 | s | 0.001 | 0.200 | Time delay on pick-up for MINCURR value |
| tLoadOn | 0.000 – 60.000 | s | 0.001 | 0.000 | Time delay on pick-up for load current release |
| tLoadOff | 0.000 – 60.000 | s | 0.001 | 0.300 | Time delay on drop off for load current release |
ZCLCPSCH Non group settings (basic)
| ZCLCPSCH 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 local acceleration logic
Loss-of-load acceleration – simplified logic diagram
