ABB RET620 - Three-Phase Overvoltage Protection (PHPTOV) Main Settings; Positive-Sequence Undervoltage Protection (PSPTUV); Positive-Sequence Undervoltage Protection (PSPTUV) Main Settings

Table 44. Three-phase overvoltage protection (PHPTOV) main settings
Parameter Function Value (Range) Step
Start value PHPTOV 0.05...1.60 x U
n
0.01
Time multiplier PHPTOV 0.05...15.00 0.01
Operate delay time PHPTOV 40...300000 ms 10
Operating curve type
1)
PHPTOV Definite or inverse time
Curve type: 5, 15, 17, 18, 19, 20
1) For further reference, see Operation characteristics table
Table 45. Positive-sequence undervoltage protection (PSPTUV)
Characteristic Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 x U
n
Start time
1)2)
Minimum Typical Maximum
U
Fault
= 0.99 x set Start value
U
Fault
= 0.9 x set Start value
51 ms
43 ms
53 ms
45 ms
54 ms
46 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
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
, Positive sequence voltage before fault = 1.1 x U
n
, f
n
= 50 Hz, positive sequence 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 46. Positive-sequence undervoltage protection (PSPTUV) main settings
Parameter
Function Value (Range) Step
Start value PSPTUV 0.010...1.200 x U
n
0.001
Operate delay time PSPTUV 40...120000 ms 10
Voltage block value PSPTUV 0.01...1.0 x U
n
0.01
Transformer Protection and Control 1MRS757846 A
RET620
Product version: 2.0
34 ABB