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Name
Type
Values (Range)
Unit
Description
IA-bias
FLOAT32
0.00...80.00
Measured bias current
amplitude phase IA
IB-bias
FLOAT32
0.00...80.00
Measured bias current
amplitude phase IB
IC-bias
FLOAT32
0.00...80.00
Measured bias current
amplitude phase IC
4.3.2.10
Technical data
Table 440:
87T Technical data
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured
current: f
n
±2 Hz
±3.0% of the set value or ±0.002 × I
n
Pickup time
1)2)
Minimum
Typical
Maximum
Low stage
High stage
36 ms
21 ms
41 ms
22 ms
46 ms
24 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5, …
1) Current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the output contact. When differential current = 2 × set operate value and f
n
= 50 Hz.
4.3.2.11
Technical revision history
Table 441:
87T Technical revision history
Technical revision
Change
B
5th harmonic and waveform blockings taken to event
data set
C
Added setting
Slope section 3. Added input
TAP_POS
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
537
Technical Manual
Summary of Contents for Relion 615 series
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