Operation Principle - ABB REL650 Technical Manual

1MRK 506 382-UEN A
6.3.7
Line distance protection REL650 2.2 IEC
Technical manual
Name Type
UL1 REAL
UL2 REAL
UL3 REAL

Operation principle

The automatic switch onto fault logic ZCVPSOF can be activated externally (by
the breaker-closed input) or internally (automatically) with the dead-line detection
using the UI level-based logic. When the setting AutoInitMode is DLD disabled,
ZCVPSOF is activated by an external binary input BC. When the setting
AutoInitMode is set to Voltage, Current or Current & Voltage modes, ZCVPSOF is
activated by the dead-line detection.
The activation from the dead-line detection function is released if the internal
signal DeadLine from the UILevel Detector function is activated at the same
time as the inputs ZACC and START_DLYD are not activated at least for the
duration of tDLD. The internal signal DeadLine from the UILevel Detector
function is activated under any of the following conditions:
• If all three-phase currents are below the setting IPh< and the AutoInitMode
setting is set to Current
• If all three-phase voltages are below the setting UPh< and the AutoInitMode
setting is set to Voltage
• If all three-phase currents and voltages are below the settings IPh< and UPh<
and the AutoInitMode setting is set to Current & Voltage
Once the dead line drops off after energization or once BC drops off, the activated
signal is extended for the duration of tSOTF.
The internal signal SOTFUILevel is activated if the phase voltage is below the
set UPh< and the corresponding phase current is above the set IPh< for a time
longer than the duration set by tDuration.
To get the TRIP signal, one of the different operate modes must also be selected
with the Mode parameter:
• Mode = Impedance; TRIP is released if either the ZACC input (connected
normally to a nondirectional distance protection start zone) or the
START_DLYD input is activated. If START_DLD is activated, TRIP is
released after a delay of tOperate.
• Mode = UILevel; TRIP is released if UILevel detector is activated
• Mode = UILvl&Imp; TRIP is released based either on the impedance-
measured criteria or UILevel detection
The ZCVPSOF function can be blocked by activating the input BLOCK.
Impedance protection
Values (Range) Unit
- kV
- kV
- kV
Section 6
Description
Voltage in phase L1
Voltage in phase L2
Voltage in phase L3
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