ABB RELION REX640 Technical Manual page 767

1MRS759142 C
REX640
Technical Manual
GUID-2E232A83-5363-4153-8085-34BC36BF0F28 V1 EN
Figure 419: MNSPTOC Inverse Curve A
If the negative sequence current drops below the Start value setting, the reset time is
defined as:
b
 
t s a
[ ]
= ⋅
 
100
 
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t[s] Reset time in seconds
Cooling time
a set
b percentage of start time elapse (START_DUR)
Section 4
Protection functions
(Equation 192)
761