Arteche smART P500, Instruction Manual

Page: 78 / 562

1BPROTECTION FUNCTIONS
PROTECTION, CONTROL AND METERING FUNCTIONS
2.1.5.3. DEFINITE TIME ELEMENTS (46DT)
2.1.5.3.1. SETTINGS RANGE (6 GROUPS)
The settings for these functions are shown in the Table 2-9
Setting Minimum Maximum Step Notes
Enable YES/NO
Pickup(A) 0,1 10,0 0,01
Definite time (s) 0 60 0,01
Table 2-9 Settings range of definite time elements. Negative sequence
Figure 2-13 shows the logical diagram for the negative sequence definite time
function.
Figure 2-13 Negative sequence definite time elements
2.1.6. OPEN PHASE PROTECTION
2.1.6.1. GENERAL DESCRIPTION (46OP)
It is a definite time protection unit. The starting value is, in per unit, the ratio between
the inverse and direct sequence currents modules.
c I a b I a a I
c I a b I a a I
I
I








• •
• •
2
2
1
2
+ +
+ +
=
where a=1
120º
∠
I
2
Pickup
blkAnyOC
blkAnyProt
r46DTTrip
(trip)
r46DTPkup
(pickup)
Def. Time
0
+
-
blk46ITDT
blk46DT