Overview
The “Automatic switch onto fault logic (ZCVPSOF)” is a function that gives an instantaneous trip when closing the breaker onto a fault. A dead-line detection check is provided to activate ZCVPSOF when the line is de-energized.
For more detailed information on “Automatic switch onto fault logic (ZCVPSOF)”, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
ZCVPSOF Identification
Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
Automatic switch onto fault logic | ZCVPSOF | – | – |
Signals & Setting Parameters
ZCVPSOF function block

ZCVPSOF Input signals
ZCVPSOF Input signals | |||
Name | Type | Default | Description |
I3P | GROUP SIGNAL | – | Current DFT |
U3P | GROUP SIGNAL | – | Voltage DFT |
BLOCK | BOOLEAN | 0 | Block of function |
START_DLYD | BOOLEAN | 0 | Start from function to be accelerated with delay by SOTF |
BC | BOOLEAN | 0 | External enabling of SOTF |
ZACC | BOOLEAN | 0 | Distance zone to be accelerated by SOTF |
ZCVPSOF Output signals
ZCVPSOF Output signals | |||
Name | Type | Description | |
TRIP | BOOLEAN | Trip output | |
ZCVPSOF Group settings (basic)
ZCVPSOF Group settings (basic) | |||||
Name | Values (Range) | Unit | Step | Default | Description |
Operation | Off On |
– | – | Off | Operation Off / On |
AutoInitMode | DLD disabled Voltage Current Current & Voltage |
– | – | DLD disabled | Automatic switch onto fault initialization |
Mode | Impedance UILevel UILvl&Imp |
– | – | UILevel | Mode of operation of SOTF Function |
IPh< | 1 – 100 | %IB | 1 | 20 | Current level for detection of dead line in % of IBase |
UPh< | 1 – 100 | %UB | 1 | 70 | Voltage level for detection of dead line in % of UBase |
tDuration | 0.000 – 60.000 | s | 0.001 | 0.020 | Time delay for UI detection (s) |
tSOTF | 0.000 – 60.000 | s | 0.001 | 1.000 | Drop off delay time of switch onto fault function |
tDLD | 0.000 – 60.000 | s | 0.001 | 0.200 | Delay time for activation of dead line detection |
tOperate | 0.03 – 120.00 | s | 0.01 | 0.03 | Time delay to operate of switch onto fault function |
ZCVPSOF Non group settings (basic)
ZCVPSOF 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 |
ZCVPSOF Monitored data
ZCVPSOF Monitored data | ||||
Name | Type | Values (Range) | Unit | Description |
IL1 | REAL | – | A | Current in phase L1 |
IL2 | REAL | – | A | Current in phase L2 |
IL3 | REAL | – | A | Current in phase L3 |
UL1 | REAL | – | kV | Voltage in phase L1 |
UL2 | REAL | – | kV | Voltage in phase L2 |
UL3 | REAL | – | kV | Voltage in phase L3 |
Logics & highlights
Simplified logic diagram for Automatic switch onto fault logic
