Table 58. Three-phase undervoltage protection (PHPTUV)
Characteristic Value
Operation accuracy At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 0.9 x set
Start value
Typical 24 ms (±15 ms)
Reset time < 40 ms
Reset ratio
Depends of 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 × f
n
, where n = 2, 3, 4, 5,
…
1)
Start value = 1.0 × U
n
, Voltage before fault = 1.1 × U
n
, f
n
= 50 Hz, undervoltage in one phase-to-phase with
nominal frequency injected from random phase angle
2) Includes the delay of the signal output contact
3)
Minimum Start value = 0.50 × U
n
, Start value multiples in range of 0.90 to 0.20
Table 59. Three-phase undervoltage protection (PHPTUV) main settings
Parameter
Function Value (Range) Step
Start value PHPTUV 0.05...1.20 pu 0.01
Time multiplier PHPTUV 0.05...15.00 0.05
Operate delay time PHPTUV 0.040...300.000 s 0.010
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 1MRS756977 D
REM630
Product version: 1.1 Issued: 2011-05-18
ABB 41
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