Arteche smART P500, Instruction Manual

Page: 69 / 562

1BPROTECTION FUNCTIONS
PROTECTION, CONTROL AND METERING FUNCTIONS
Figure 2-5 Low-level neutral instantaneous overcurrent elements
2.1.2.3.1. SETTING RANGES (6 GROUPS)
The settings for these functions (low-level and high-level) are shown in the Table
2-5
Setting Minimum Maximum Step Notes
Enable YES/NO
Pickup (A)
0,02 20 0,001 For In=1 A
0,10 100 0,001 For In=5 A
Definite Time (s) 0 60 0,01
Table 2-5 Settings range for the neutral instantaneous elements
The trip current is set in secondary Amperes. The notes about operation time are
the same as those given for phases. Figure 2-6 shows the logical diagram for the
neutral high-level instantaneous overcurrent function.
Figure 2-6 Neutral high level instantaneous overcurrent function element
blkAnyOC
blkAnyProt
blk50
+
-
IFN
MED
IFN High pickup
blk50HN
Def. Time
0
r50HNPkup
(pickup)
r50HNTrip
(trip)
blkAnyOC
blkAnyProt
blk50
+
-
IFN
MED
blk50LN
T. Fijo
0
r50LNPkup
(pickup)
r50LNTrip
(trip)
IFN Low Pickup