Table 33. Three phase undervoltage protection (PHPTUV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the voltage
measured: fn ±2 Hz
±1.5% of the set value or ±0.002 x U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 0.9 x set
Start value
62 ms
64 ms
66 ms
Reset time
< 40 ms
Reset ratio
Depends on the set
Relative hysteresis
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)
Start value
= 1.0 x U
n
, Voltage before fault = 1.1 x U
n
, f
n
= 50 Hz, undervoltage in one phase-to-phase 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
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
Function
Value (Range)
Step
Start value
PHPTUV
0.05...1.20 x U
n
0.01
Time multiplier
PHPTUV
0.05...15.00
0.05
Operate delay time
PHPTUV
60...300000 ms
10
Operating curve
type
1)
PHPTUV
Definite or inverse time
Curve type: 5, 15, 21, 22, 23
1) For further reference please refer to the Operating characteristics table
Motor Protection and Control
1MRS756890 D
REM615
Product version: 3.0
Issued: 2010-06-29
36
ABB
Содержание RELION REM615
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