Name Type Values (Range) Unit Description
IB-diff FLOAT32 0.00...80.00 Differential current phase B
IC-diff FLOAT32 0.00...80.00 Differential current phase C
IA-bias FLOAT32 0.00...80.00 Stabilization current phase A
IB-bias FLOAT32 0.00...80.00 Stabilization current phase B
IC-bias FLOAT32 0.00...80.00 Stabilization current phase C
4.3.1.10 Technical data
Table 430: 87L 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
High stage, trip time
2)3)
Minimum Typical Maximum
22 ms 25 ms 29 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time (Low stage) <40 ms
Trip time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Trip 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 trip 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 431: 87L 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.
D
Internal Improvement.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 499
Technical Manual
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