ABB RELION REX640 Technical Manual page 1111

1MRS759142 C
REX640
Technical Manual
0.025
Fault indication
0.02
t
0
Fault start transition
settle-down
0.015
Settling down delay
0.01
0.005
0
-0.005
-0.01
1300
TRIGG_T
TRIGG_REC
Fault indication
Fault start transition
settle-down
t
0
0.03
Settling down delay
0.02
0.01
0
-0.01
-0.02
1200 1300
GUID-B7CF0F2B-6774-4C5D-BA6A-24CE7FBADA91 V1 EN
Figure 598: Fault distance estimate triggering moment definitions
Fault loops "AB Fault", "BC Fault" and "CA Fault"
Fault loops "AB Fault", "BC Fault" and "CA Fault" are used for phase-to-phase short
circuit faults as well as in the case of a two-phase-to-earth fault if the individual earth
faults are located at the same feeder.
model. The following impedances are measured and stored in the recorded data of
SCEFRFLO.
R
Flt point resistance
=
GUID-005ED281-68F9-4C9E-8FB0-2518DC0B3E5C V1 EN
Protection related functions
G0 (blue) and G0 difference (red)
t
1
t
Zero conductance gradient
rising edge
1400 1500
Time delay
G0 (blue) and G0 difference (red)
t
1
Zero conductance gradient
rising edge
1400 1500
Figure 599
fault
2
Section 5
2
1600 1700
t
2
1600 1700
shows the phase-to-phase fault loop
1800
1800
(Equation 265)
1105