ABB RELION REX640 Technical Manual page 902

Section 4
Protection functions
896
Compensation of over-reaching with
under-reaching zone
Tilt angle zone x < 0 deg.
X
Zone Z1
GUID-A2493D2F-AED5-4525-9161-9101DBF09230 V1 EN
Figure 489: Operation principle of top reactance line tilting
The tilt angle must be carefully set. If the tilt angle has been set to a value where
polygon boundaries do not form a close loop for an element, an internal mechanism
modifies the tilt angle for that element so that the polygon boundary is always closed.
If the set tilt angle is suitable for another element, the tilt angle of that element is not
internally modified. Tilt angle conflicts are monitored by TLT_ANG_CONFLICT
value. This integer value is a ten-bit value indicating tilt angle modifications per zone
and fault type.
Table 843: TLT_ANG_CONFLICT description
TLT_ANG_CONFLICT bit field
(MSB) xx xx xx xx YZ (LSB)
(MSB) xx xx xx YZ zz (LSB)
(MSB) xx xx YZ xx xx (LSB)
(MSB) xx YZ xx xx xx (LSB)
(MSB) YZ xx xx xx xx (LSB)
For example, TLT_ANG_CONFLICT value "36" = "00 00 10 01 00" indicates that
the tilt angles of the zone 2 earth-fault impedance element and zone 3 short circuit or
three-phase impedance element have been modified. These zone settings should be
Compensation of under-reaching with
over-reaching zone
Tilt angle zone x > 0 deg.
X
Zone Z2
R
Description
Y active = Zone 1 earth-fault impedance element
tilt angle modified
Z active = Zone 1 short circuit impedance element
tilt angle modified
Y active = Zone 2 earth-fault impedance element
tilt angle modified
Z active = Zone 2 short circuit impedance element
tilt angle modified
Y active = Zone 3 earth-fault impedance element
tilt angle modified
Z active = Zone 3 short circuit impedance element
tilt angle modified
Y active = Zone 4 earth-fault impedance element
tilt angle modified
Z active = Zone 4 short circuit impedance element
tilt angle modified
Y active = Zone 5 earth-fault impedance element
tilt angle modified
Z active = Zone 5 short circuit impedance element
tilt angle modified
1MRS759142 C
R
REX640
Technical Manual