ABB RELION 620 Series Technical Manual page 489

1MRS757644 F
620 series
Technical Manual
conditions are not valid. In case the fault is transient and self-extinguishes, START
output stays activated until the elapse of reset timer (setting Reset delay time).
In case detection of temporary earth faults is not desired, the activation
of START output can be delayed with setting Start delay time.
To keep the operate timer activated between current spikes during
intermittent or restriking earth fault, the Reset delay time should be set
to a value exceeding the maximum expected time interval between
fault spikes (obtained at full resonance condition). The recommended
value is at least 300 ms.
GUID-24122726-5059-44B7-84AD-617E1801F5A8 V1 EN
Figure 243: Operation in "Alarming EF" mode
Section 4
Protection functions
483