ABB RELION REX640 Technical Manual page 553

1MRS759142 C
REX640
Technical Manual
• Earth fault is detected by the GFC
• Fault direction equals Directional mode setting and fault direction detection is
done only at the beginning of the fault
•
Estimated stabilized fundamental frequency residual current
set Min operate current level, which is applied in current magnitude threshold
supervision, and which is further defined with setting Operating quantity
(available options are "Adaptive", "Amplitude" and "Resistive").
In the "Transient EF" mode, the START output is activated immediately when start
conditions are met.
Uo
Io
GFC
release
Operate
timer
Reset timer
START
OPERATE
Reset delay time
GUID-62597545-F521-46FE-BF8A-08788C4C3698 V1 EN
Figure 298: Operation in "Transient EF" mode
When operation mode "Transient EF" is selected, Operating quantity
should be set to "Resistive" and Min operate current to the minimum
Protection functions
1
I
o stab
Operate delay time
Section 4
exceeds the
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