Differential Protection; Line Differential Protection With In-Zone Power Transformer Lnpldf (Ansi 87L) - ABB RELION REX640 Technical Manual
Protection and control
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Also See for RELION REX640:
- Technical manual (1760 pages) ,
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- Engineering manual (156 pages)
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1MRS759142 F
4.2.10.9
Technical data
Table 644: IFPTOC Technical data
Characteristics
Operation accuracy
1
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy
4.3
Differential protection
4.3.1
Line differential protection with in-zone power
transformer LNPLDF (ANSI 87L)
4.3.1.1
Identification
Function description
Line differential protection with in-
zone power transformer
1
Measured with static signal output (SSO)
REX640
Technical Manual
Value
Depending on the frequency of the measured current f
Earth-fault current and touch voltage:
±1% of the set value or ±0.005 × I
Accuracy of
follows
Residual voltage:
±1.5% of the set value or ±0.002 × U
Residual current:
±1.5% of the set value or ±0.002 × I
±5.0% of the set value (at currents > 10 x I
Typically 30 ms
<30 ms
Typically 0.96
<50 ms
±1.0% of the set value or ±20 ms (DT)
±3% of the theoretical value or ±40 ms (IDMT)
±2 Hz
n
for
n
accuracy.
n
(at currents ≤10 x I
, when Uo is nominal)
n
n
)
n
IEC 61850
IEC 60617
identification
identification
LNPLDF
3Id/I>
Protection functions
ANSI/IEEE C37.2
device number
87L
643
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