Three-Phase Overvoltage Protection (Phptov); Three-Phase Overvoltage Protection (Phptov) Main Settings - ABB REF615 Product Manual

ABB
Feeder Protection and Control
REF615
Product version: 2.0
Table 34. Three-phase overvoltage protection (PHPTOV)
Operation Depending on the frequency of the voltage measured: f
accuracy
±1.5% of the set value or ±0.002 x U
Start time 1) 2)
U
Fault
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 0.9 x U
n
frequence injected from random phase angle, results based on statistical distribution of 1000 measurements.
2) Includes the delay of the signal output contact
3) Maximum Start value = 1.20 x U
Table 35. Three-phase overvoltage protection (PHPTOV) main settings
Parameter
Start value
Time multiplier
Operate delay time
Operating curve type 1)
1) For further reference please refer to the Operating characteristics table at the end of the Technical data chapter
= 1.1 x set Start value
, f = 50 Hz, overvoltage in one phase-to-phase with nominal
n n
, Start value multiples in range of 1.10 to 2.00
n
Function
PHPTOV
PHPTOV
PHPTOV
PHPTOV
n
n
Minimum Typical
22 ms 24 ms
< 40 ms
Depends on the Relative hysteresis
< 35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20
ms
3)
DFT: -50dB at f = n x f ,
n
where n = 2, 3, 4, 5,...
Value (Range)
0.05...1.60 x U
n
0.05...15.00
40...300000 ms
Definite or inverse time
Curve type: 5, 15, 17, 18, 19, 20
1MRS756379 D
±2Hz
Maximum
26 ms
Step
0.01
0.05
10
29