ABB Relion REM615 Product Manual page 41

ABB
Motor Protection and Control
REM615
Product version: 3.0
Table 41. Negative phase-sequence overcurrent protection for motors (MNSPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative-sequence current before = 0.0, f
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
Start value
Operating curve type
Operate delay time
Cooling time
Operation
I = 2.0 x set Start
Fault
value
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Function
MNSPTOC
MNSPTOC
MNSPTOC
MNSPTOC
MNSPTOC
Value
Depending on the frequency of the current
measured: fn ±2 Hz
±1.5% of the set value or ±0.002 x I
Minimum Typical
22 ms 24 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50 dB at f = n x f
n
...
Value (Range)
0.01...0.50 x I
n
ANSI Def. Time
IEC Def. Time
Inv. Curve A
Inv. Curve B
100...120000 ms
5...7200 s
Off
On
1MRS756890 D
Issued: 2010-06-29
n
Maximum
25 ms
3)
, where n = 2, 3, 4, 5,
Step
0.01
-
10
1
-
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