ABB Relion REM615 Product Manual page 36

Motor Protection and Control
REM615
Product version: 3.0
Table 33. Three phase undervoltage protection (PHPTUV)
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) Start value = 1.0 x U , Voltage before fault = 1.1 x U
n
nominal frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Minimum Start value = 0.50, Start value multiples in range of 0.90 to 0.20
Table 34. Three-phase undervoltage protection (PHPTUV) main settings
Parameter
Start value
Time multiplier
Operate delay time
Operating curve
1)
type
1) For further reference please refer to the Operating characteristics table
36
U = 0.9 x set
Fault
Start value
, f
n n
Function
PHPTUV
PHPTUV
PHPTUV
PHPTUV
Value
Depending on the frequency of the voltage
measured: fn ±2 Hz
±1.5% of the set value or ±0.002 x U
Minimum Typical
62 ms 64 ms
< 40 ms
Depends on the set Relative hysteresis
< 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
...
= 50 Hz, undervoltage in one phase-to-phase with
Value (Range)
0.05...1.20 x U
n
0.05...15.00
60...300000 ms
Definite or inverse time
Curve type: 5, 15, 21, 22, 23
1MRS756890 D
Issued: 2010-06-29
n
Maximum
66 ms
3)
, where n = 2, 3, 4, 5,
Step
0.01
0.05
10
ABB