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Section 4
1MAC050144-MB C
Protection functions
372
615 series ANSI
Technical Manual
4.6.2.9
Technical data
Table 327: 87TTechnical data
4.6.3
Low impedance restricted ground-fault protection 87L0ZREF
4.6.3.1
Identification
IA-diff
FLOAT32
0.00...80.00
Measured differential current
amplitude phase IL1
IB-diff
FLOAT32
0.00...80.00
Measured differential current
amplitude phase IL2
IC-diff
FLOAT32
0.00...80.00
Measured differential current
amplitude phase IL3
IA-bias
FLOAT32
0.00...80.00
Measured bias current amplitude
phase IL1
IB-bias
FLOAT32
0.00...80.00
Measured bias current amplitude
phase IL2
IC-bias
FLOAT32
0.00...80.00
Measured bias current amplitude
phase IL3
Name
Type
Values (Range)
Unit
Description
Characteristic
Value
Pickup accuracy
Depending on the frequency of the current
measured: f
n
±2Hz
±3.0% of the set value or ±0.002 x I
n
Pickup time
1 ,2
1. Current before fault = 0.0, f
n
= 60Hz, results based on statistical distribution of 1000 measurements.
2. Includes the delay of the output contact. When differential current = 2 x set trip value and fn = 60 Hz.
Minimum
Typical
Maximum
Low srage
High stage
34 ms
21 ms
40 ms
22 ms
44 ms
24 ms
Reset time
< 40 ms
Reset ratio
Typical 0.96
Suppression of harmonics
DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Low impedance restricted ground-fault
protection
LREFPNDF
dIoLo>
87LOZREF
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
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Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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