Technical Data; Technical Revision History - ABB 615 series Technical Manual

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4.3.2.10
4.3.2.11
615 series ANSI
Technical Manual
Name Type
IA-bias FLOAT32
IB-bias FLOAT32
IC-bias FLOAT32

Technical data

Table 440: 87T Technical data
Characteristic
Operation accuracy
1)2)
Pickup time
Low stage
High stage
Reset time
Reset ratio
Suppression of harmonics
1) Current before fault = 0.0, f
2) Includes the delay of the output contact. When differential current = 2 × set operate value and f

Technical revision history

Table 441: 87T Technical revision history
Technical revision
B
C
Values (Range)
0.00...80.00
0.00...80.00
0.00...80.00
Value
Depending on the frequency of the measured
current: f
±3.0% of the set value or ±0.002 × I
Minimum
36 ms
21 ms
Typically 40 ms
Typically 0.96
DFT: -50 dB at f = n × f
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Change
5th harmonic and waveform blockings taken to event
data set
Added setting
TAP_POS
Protection functions
Unit Description
Measured bias current
amplitude phase IA
Measured bias current
amplitude phase IB
Measured bias current
amplitude phase IC
±2 Hz
n
Typical
41 ms
22 ms
, where n = 2, 3, 4, 5, ...
n
Slope section 3 . Added input
Section 4
n
Maximum
46 ms
24 ms
= 50 Hz.
n
537