Table 44: Measurement
Text
Explanation
Del (Def)
Operating time of the final stage (starter).
K0m
Value of the zero-sequence compensation factor for a parallel circuit (ratio of the
mutual impedance to three times the positive-sequence impedance);
m0
1
Z
3 Z
. The mutual impedance is not taken into account for a setting
of zero.
K0mAngle
Phase-angle of the zero-sequence compensation factor for a parallel circuit
m0
1
Z
3 Z
Arg
ILoad
The inclination of the characteristic changes from 7° to 14° when the load current
exceeds the setting of ILoad.
ILoad = 0.01..1.99 I
N
Switches as described
ILoad = 0
Constant inclination of 14°
ILoad = 2
Constant inclination of 7°
UminFault
Minimum voltage at which the fault voltage is used for determining fault direction.
MemDirMode
Procedure to be followed after decay of the memory voltage and no voltage is
available for measurement:
•
Blocks
•
Trips
•
Conditional trip
Only trips, if the directions during the present and the preceding times steps are in
opposition.
DefDirMode
Response at the end of the final time step (definitive time):
•
Non-direct.: Trips for faults in both directions
•
Forwards: Trips only for faults in the forwards direction
BlockZ1
Zone 1 measurement blocking:
•
off
•
on
X(n)
Pick-up line reactance for Zone (n):
•
X < 0 for restraint direction
•
X = 0 disables the zone (Zone 1 cannot be disabled)
R(n)
Pick-up line resistance for Zone (n); the sign must be the same as for X (n).
RR(n)
Resistive reach (incl. arc resistance) of Zone (n) for phase faults; the sign must be
the same as for X (n).
RRE(n)
Resistive reach (incl. arc resistance) of Zone (n) for ground faults; the sign must be
the same as for X (n).
K
0
(n)
Value of the zero-sequence compensation factor for E/F’s in Zone (n);
0
1
1
3
Z
Z
Z
.
K
0
Angle(n)
Phase-angle of the zero-sequence compensation factor for E/F’s in Zone (n);
0
1
1
3
Arg Z
Z
Z
Table continues on next page
Section 5
1MRK 505 406-UEN B
Bay protection functions
32
Bay protection functions REB500
Technical manual
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