Displays up to three instances of REF with eight settings per instance. These are for
the Current transformer ratios, operation, rated current (Ibase) operate angle of the
zero sequence directional feature and Idmin which is a percentage of Ibase and is the
current threshold in section one of the characteristic slope.
9.3.2.5
High impedance differential protection (PDIF, 87X)
Settings/Setting group N/Differential protection/HighImpDifferential(PDIF)
Displays up to three instances of HZR with settings for operation, the alarm voltage
level in volts on the CT secondary side, the time delay to activate the alarm, the operate
voltage level in volts on the secondary side of the CT and the value of the series
resistor in ohms.
9.3.3
Distance protection
9.3.3.1
Overview
Under Distance protection there are settings for Distance zones, Phase selection,
directional impedance, Power swing detection, and Automatic switch onto fault
protection. Each instance of a function can be switched on or off with the operation
parameter and the remaining parameter settings like rated current and voltage are data
required for the function to operate.
9.3.3.2
Distance protection zones (PDIS, 21)
Settings/Setting group N/Distance protection/DistanceZones/ZM01
Displays 19 adjustable parameters. These include the ohms per phase for resistive
and reactive reach as well as the ohms per loop for phase to phase, and phase to earth
faults. Zones can also be set on or off.
9.3.3.3
Phase selection with load encroachment (PDIS, 21)
Settings/Setting group N/Distance protection/Phase selection/GFPS
Displays 19 settings including minimum operating current for both phase-phase and
phase-earth fault loops.
9.3.3.4
Directional impedance (RDIR)
Settings/Setting Group N/Distance protection/DirectionalImpedance(RDIR)
Includes settings for rated current, voltage and impedance direction angles.
9.3.3.5
Power swing detection (RPSB, 78)
Settings/Setting Group N/Distance protection/PowerSwingDetection(RPSB)
Section 9
Read and change settings
46
Operator's manual
1MRK504049-UEN rev. D
RET 670
