Application - ABB RELION REX640 Technical Manual

1MRS759142 C
4.7.1.7
REX640
Technical Manual
Table 847: 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
Besides the already mentioned recorded data, the monitored data zone outputs give
information regarding zone 1 particularly. The direction of the fault is indicated with
the monitored data DIRECTION ("unknown", "forward", "backward " or "both"). 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.
The impedances are shown in primary ohms.

Application

DSTPDIS provides a fast and reliable protection for overhead lines and power cables.
The function is applied in distribution and sub-transmission networks where three-
phase tripping is allowed for all kinds of faults.
Protection functions
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
Section 4
905