ABB RED615 Product Manual page 31

ABB
Line Differential Protection and Control
RED615
Product version: 4.0
Protection functions
Table 27. Line differential protection (LNPLDF)
Characteristics
1)
Operation accuracy
2)3)
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 fiber optic).
2) Without additional delay in the communication channel (as when using dedicated fiber optic).
3) Including the delay of the output contact. When differential current = 2 x
Low operate value multiples in range of 1.5 to 20.
4)
Table 28. Line differential protection (LNPLDF) main settings
Parameter
High operate value
Low operate value
Operate delay time
Operate curve type
Time multiplier
Start value 2.H
CT ratio correction
High operate value and f
Values (Range)
200...4000
10...200
45...200000
1=ANSI Ext. inv.
3=ANSI Norm. inv.
5=ANSI Def. Time
9=IEC Norm. inv.
10=IEC Very inv.
12=IEC Ext. inv.
15=IEC Def. Time
0.05...15.00
10...50
0.200...5.000
Value
Depending on the frequency of the current measured: f
±2 Hz
Low stage ±2.5% of the set value
High stage ±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
= 50 Hz with galvanic pilot wire link + 5 ms.
n
Unit Description
% I Instantaneous stage operate value
n
% I Basic setting for the stabilized
n
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. harmonic
component to fundamental
component required for blocking
Remote phase current transformer
ratio correction
1MRS756500 F
n
Maximum
29 ms
4)
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