Three-Phase Overvoltage Protection - ABB RET630 Product Manual

Transformer Protection and Control
RET630
Product version: 1.0
Table 45. Three-phase overvoltage protection (PHPTOV)
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 = 0.9 × U
n
nominal frequency injected from random phase angle
2) Includes the delay of the signal output contact
3) Maximum Start value = 1.20 × U
Table 46. Three-phase overvoltage protection (PHPTOV) 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
36
U = 2.0 x set Start
Fault
value
, f
n n
, Start value multiples in range of 1.10 to 2.00
n
Function
PHPTOV
PHPTOV
PHPTOV
PHPTOV
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
Typical 17 ms (±15ms)
< 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, overvoltage in one phase-to-phase with
Value (Range)
0.05...1.60 pu
0.05...15.00
0.40...300.000 s
Definite or inverse time
Curve type: 5, 15, 17, 18, 19, 20
1MRS756788 A
Issued: 15.09.2009
n
3)
, where n = 2, 3, 4, 5,
Step
0.01
0.05
0.10
ABB