ABB RED615 Product Manual page 18

Line Differential Protection and Control
RED615
Product version: 1.1
Protection functions
Line differential protection (LNPLDF)
Operation Depending on the frequency of the current measured: fn ±2 Hz
accuracy 1)
Low stage
High stage
High stage operate time
Reset time
Reset ratio
Retardation time (low stage)
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
1) With the symmetrical communication channel (as when using dedicated fibre optic)
2) Without additional delay in the communication channel (as when using dedicated fibre optic)
3) Including the delay of the output contact. When differential current = 2 x High operate value and f
4) Low operate value multiples in range of 1.5 to 20.
Line differential protection (LNPLDF) main settings
Parameter Values (Range)
High operate value 200...4000
Low operate value 10...200
Operate delay time 45...200000
Operating curve 1=ANSI Ext. inv.
type 3=ANSI Norm. inv.
5=ANSI Def. Time
9=IEC Norm. inv.
10=IEC Very inv.
12=IEC Ext. inv.
15=IEC Def. Time
Time multiplier 0.05...15.00
Start value 2.H 10...50
CT ratio correction 0.200...5.000
Binary signal transfer (BSTGGIO)
Signalling delay
18
2) 3)
±2.5% of the set value
±2.5% of the set value
Minimum Typical
22 ms 25 ms
< 40 ms
Typical 0.96
< 40 ms
±1.0% of the set value or ±20 ms
±5.0% of the set value or ±20 ms
Unit Description
% I Instantanueous stage
n
operate value
% I Basic setting for the sta-
n
bilized stage start
ms Operate delay time for
stabilized stage
Selection of time delay
curve for stabilized stage
Time multiplier in IDMT
curves
% The ratio of the 2. har-
monic component to
fundamental component
required for blocking
Remote phase current
transformer ratio correc-
tion
< 5 ms
1MRS756500 A
Maximum
29 ms
4)
= 50 Hz
n
ABB