ABB RELION REX640 Technical Manual page 982

Protection functions
Enumerator value
26
27
28
29
30
31
Table 925: Recorded data parameters regarding specific zones
Parameter
Fault/load Dir Znx
Dir resistance Znx
Dir reactance Znx
Flt loop 1st Ris Znx
Flt loop 1st Rea Znx
Flt loop 2nd Ris Znx
Flt loop 2nd Rea Znx
Flt PP-loop Ris Znx
Flt PP-loop Rea Znx
Phase reactance Znx
In case of a no-fault condition, the direction of the load current seen by a
three-phase fault measuring element (based on positive-sequence signal data) is
indicated. DIR_LOOP_R and DIR_LOOP_X are the loop resistance and reactance from
the impedance calculation used in directional discrimination for zone 1. Depending
on the released fault loops, the calculated fault loop impedance can be read from
the parameters FLTLOOP_RFST, FLTLOOP_XFST, FLTLOOP_RPP and FLTLOOP_XPP. If
two phase-to-earth loops are released simultaneously for measurement, the second
phase-to-earth impedance can be found from the parameters FLTLOOP_RSND
and FLTLOOP_XSND. The corresponding positive-sequence phase-to-earth fault
reactance can be found from parameter FLTPH_X.
982
The impedances are shown in primary ohms.
Description
Zones 2,4 and 5
Zones 1,2,4 and 5
Zones 3,4 and 5
Zones 1,3,4 and 5
Zones 2,3,4 and 5
Zones 1,2,3,4 and 5
Description
Direction of fault or load zone Zx
Direction resistance, zone Zx
Direction reactance, zone Zx
First PE-Loop resistance, zone Zx
First PE-Loop reactance, zone Zx
Second PE-Loop resistance, zone Zx
Second PE-Loop reactance, zone Zx
PP-Loop resistance, zone Zx
PP-Loop reactance, zone Zx
Phase reactance Znx
1MRS759142 F
REX640
Technical Manual