Table 41. Negative phase-sequence overcurrent protection for motors (MNSPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the current
measured: fn ±2 Hz
±1.5% of the set value or ±0.002 x I
n
Start time
1)2)
Minimum
Typical
Maximum
I
Fault
= 2.0 x set
Start
value
22 ms
24 ms
25 ms
Reset time
< 40 ms
Reset ratio
Typical 0.96
Retardation time
< 35 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 theoretical value or ±20 ms
3)
Suppression of harmonics
DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
1) Negative-sequence current before = 0.0, f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3)
Start value
multiples in range of 1.10 to 5.00
Table 42. Negative phase-sequence overcurrent protection for motors (MNSPTOC) main
settings
Parameter
Function
Value (Range)
Step
Start value
MNSPTOC
0.01...0.50 x I
n
0.01
Operating curve type
MNSPTOC
ANSI Def. Time
IEC Def. Time
Inv. Curve A
Inv. Curve B
-
Operate delay time
MNSPTOC
100...120000 ms
10
Cooling time
MNSPTOC
5...7200 s
1
Operation
MNSPTOC
Off
On
-
Motor Protection and Control
1MRS756890 D
REM615
Product version: 3.0
Issued: 2010-06-29
ABB
41
Содержание RELION REM615
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