ABB RELION REB500 Technical Manual page 38

Section 5
Bay protection functions
Table 44: Measurement
Text
Del (Def)
K0m
K0mAngle
ILoad
UminFault
MemDirMode
DefDirMode
BlockZ1
X(n)
R(n)
RR(n)
RRE(n)
K (n)
0
K Angle(n)
0
Table continues on next page
32
Explanation
Operating time of the final stage (starter).
Value of the zero-sequence compensation factor for a parallel circuit (ratio of the
mutual impedance to three times the positive-sequence impedance);
 

Z 3 Z
m0 1
. The mutual impedance is not taken into account for a setting
of zero.
Phase-angle of the zero-sequence compensation factor for a parallel circuit


Arg Z 3 Z
m0
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
ILoad = 0
ILoad = 2
Minimum voltage at which the fault voltage is used for determining fault direction.
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.
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
Zone 1 measurement blocking:
• off
• on
Pick-up line reactance for Zone (n):
• X < 0 for restraint direction
• X = 0 disables the zone (Zone 1 cannot be disabled)
Pick-up line resistance for Zone (n); the sign must be the same as for X (n).
Resistive reach (incl. arc resistance) of Zone (n) for phase faults; the sign must be
the same as for X (n).
Resistive reach (incl. arc resistance) of Zone (n) for ground faults; the sign must be
the same as for X (n).
Value of the zero-sequence compensation factor for E/F's in Zone (n);
  
 
Z Z 3 Z
0 1
Phase-angle of the zero-sequence compensation factor for E/F's in Zone (n);
  

Arg Z Z
0 1
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
1
Switches as described
Constant inclination of 14°
Constant inclination of 7°

1
.


3 Z
1
Bay protection functions REB500
1MRK 505 406-UEN B
Technical manual