Table 81. Three-phase overvoltage variation protection (PHVPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
PHVPTOV
0.05...3.00 × U
n
0.01
Time interval
PHVPTOV
1...120 min
1
Num of start phases
PHVPTOV
1 = 1 out of 3
2 = 2 out of 3
3 = 3 out of 3
-
Voltage selection
PHVPTOV
1 = phase-to-earth
2 = phase-to-phase
-
Table 82. Three-phase overvoltage protection (PHPTOV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured voltage: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 1.1 × set
Start value
23 ms
27 ms
31 ms
Reset time
Typically 40 ms
Reset ratio
Depends on 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 × f
n
, where n = 2, 3, 4, 5,…
1)
Start value = 1.0 × U
n
, Voltage before fault = 0.9 × 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 × U
n
,
Start value multiples in range of 1.10...2.00
Table 83. Three-phase overvoltage protection (PHPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
PHPTOV
0.05...1.60 × U
n
0.01
Time multiplier
PHPTOV
0.025...15.000
0.005
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 the Operation characteristics table
1MRS759144 A
REX640
Product version: 1
ABB
55
Summary of Contents for RELION REX640
Page 1: ...RELION PROTECTION AND CONTROL REX640 Product Guide...
Page 128: ...128...
Page 129: ......
Page 130: ......
Page 131: ......
