ABB RED615 ANSI, Руководство по эксплуатации продукта

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Protection functions
Table 27. Line differential protection (LNPLDF)
Characteristics Value
Operation accuracy
1) Depending on the frequency of the current measured: f
n
±2 Hz
Low stage ±2.5% of the set value
High stage ±2.5% of the set value
Minimum Typical Maximum
High stage, operate time
2)3)
22 ms 25 ms 29 ms
Reset time < 40 ms
Reset ratio Typical 0.96
Retardation time (Low stage) < 40 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the set value or ±20 ms 4)
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 High operate value and f
n
= 50 Hz with galvanic pilot wire link + 5 ms.
4) Low operate value multiples in range of 1.5 to 20.
Table 28. Line differential protection (LNPLDF) main settings
Parameter Values (Range) Unit Description
High operate value 200...4000 % I
n
Instantaneous stage operate value
Low operate value 10...200 % I
n
Basic setting for the stabilized
stage start
Operate delay time 45...200000 ms Operate delay time for stabilized
stage
Operate curve type 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 Selection of time delay curve for
stabilized stage
Time multiplier 0.05...15.00 Time multiplier in IDMT curves
Start value 2.H 10...50 % The ratio of the 2. harmonic
component to fundamental
component required for blocking
CT ratio correction 0.200...5.000 Remote phase current transformer
ratio correction
Line Differential Protection and Control 1MRS756500 F
RED615
Product version: 4.0
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