Table 36. Three-phase overvoltage protection (PHPTOV)
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
= 1.1 x set
Start value
22 ms 24 ms 26 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 x f
n
, where n = 2, 3, 4, 5,…
1)
Start value
= 1.0 x U
n
, Voltage before fault = 0.9 x U
n
, f
n
= 50 Hz, overvoltage 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) Maximum
Start value
= 1.20 x U
n
,
Start value
multiples in range of 1.10 to 2.00
Table 37. 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 please refer to the Operating characteristics table
Transformer Protection and Control 1MRS756891 F
RET615
Product version: 4.0
ABB 39
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