ABB Relion REM615 Product Manual page 37

ABB
Motor Protection and Control
REM615
Product version: 3.0
Table 35. Positive sequence undervoltage protection (PSPTUV)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Start value = 1.0 x U , Positive sequence voltage before fault = 1.1 x U
n
undervoltage with nominal frequency injected from random phase angle, results based on statistical distribution
of 1000 measurements
2) Includes the delay of the signal output contact
Table 36. Positive sequence undervoltage protection (PSPTUV) main settings
Parameter
Start value
Operate delay time
Voltage block value
U = 0.99 x set
Fault
Start value
U = 0.9 x set Start
Fault
value
Function
PSPTUV
PSPTUV
PSPTUV
Value
Depending on the frequency of the voltage
measured: f ±2 Hz
n
±1.5% of the set value or ±0.002 x U
Minimum Typical
51 ms 53 ms
43 ms 45 ms
< 40 ms
Depends of the set Relative hysteresis
< 35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n x f
n
...
, f = 50 Hz, positive sequence
n n
Value (Range)
0.010...1.200 x U
n
40...120000 ms
0.01...1.0 x U
n
1MRS756890 D
Issued: 2010-06-29
n
Maximum
54 ms
46 ms
, where n = 2, 3, 4, 5,
Step
0.001
10
0.01
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