4.3.1.10 Technical data
Table 337: LNPLDF Technical data
Characteristics Value
Operation accuracy
1)
Depending on the frequency of the measured
current: 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 Typically 40 ms
Reset ratio Typically 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 ×
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...20.
4.3.1.11 Technical revision history
Table 338: LNPLDF Technical revision history
Technical revision
Change
B Step value changed from 0.05 to 0.01 for the
Time multiplier
setting.
C Support for in-zone transformer added.
Differential and bias currents are shown as rated
currents in the Measurements view.
4.3.2 Stabilized and instantaneous differential protection for 2W-
transformers TR2PTDF
4.3.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Stabilized and instantaneous
differential protection for 2W-
transformers
TR2PTDF 3dI>T 87T
1YHT530004D05 D Section 4
Protection functions
615 series 383
Technical Manual
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