Operation Principle - ABB REL650 series Technical Manual

1MRK 506 335-UUS A
Name Values (Range)
UVPickup 1 - 100
tDuration 0.000 - 60.000
tSOTF 0.000 - 60.000
tDLD 0.000 - 60.000
Table 69: ZCVPSOF Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
6.8.6
Technical manual
Unit Step
%VB 1
s 0.001
s 0.001
s 0.001
Unit Step
- 1

Operation principle

Automatic switch onto fault logic, voltage and current based function (ZCVPSOF) can be
activated externally by Breaker Closed Input or internally (automatically) by using VI
Level Based Logic see figure 87.
The activation from the Dead line detection function is released if the internal signal
deadLine from the VILevel function is activated at the same time as the input ZACC is not
activated during at least for a duration tDLD and the setting parameter AutoInit is set to
Enabled.
When the setting AutoInit is Disabled, the function is activated by an external binary input
BC. To get a trip one of the following operation modes must also be selected by the
parameter Mode:
Mode = Impedance; trip is released if the input ZACC is activated (normal connected to
non directional distance protection zone).
Mode = VILevel; trip is released if VILevel detector is activated.
Mode = VILvl&Imp; trip is initiated based on impedance measured criteria or VILevel
detection.
The internal signal deadLine from the VILevel detector is activated if all three phase
currents and voltages are below the setting IPhPickup and UVPickup.
VI Level based measurement detects the switch onto fault condition even though the
voltage is very low. The logic is based on current and voltage levels. The internal signal
SOTF VILevel is activated if a phase voltage is below the setting UVPickup and
corresponding phase current is above the setting IPhPickup longer than the time
tDuration.
Default Description
70 Voltage level for detection of dead line in % of
VBase
0.020 Time delay for UI detection
1.000 Drop off delay time of switch onto fault function
0.200 Delay time for activation of dead line detection
Default Description
1 Selection of one of the Global Base Value
groups
Section 6
Impedance protection
185