ABB Relion 630 Series RET630 Product Manual page 44

Transformer Protection and Control
RET630
Product version: 1.1
Table 52. 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 × U , Voltage before fault = 1.1 × U
n
nominal frequency injected from random phase angle
2) Includes the delay of the signal output contact
3) Minimum Start value = 0.50 × U
Table 53. 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
44
U = 0.9 x set
Fault
Start value
, f
n n
, Start value multiples in range of 0.90 to 0.20
n
Function
PHPTUV
PHPTUV
PHPTUV
PHPTUV
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
Typical 24 ms (±15 ms)
< 40 ms
Depends of 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 × f
n
...
= 50 Hz, undervoltage in one phase-to-phase with
Value (Range)
0.05...1.20 pu
0.05...15.00
0.040...300.000 s
Definite or inverse time
Curve type: 5, 15, 21, 22, 23
1MRS756978 D
Issued: 2011-05-18
n
3)
, where n = 2, 3, 4, 5,
Step
0.01
0.05
0.010
ABB