ABB RELION 615 Series Product Manual page 40

Transformer Protection and Control
RET615
Product version: 5.0 FP1
Table 39. 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
distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Maximum Start value = 1.20 × U
n
Table 40. Three-phase overvoltage protection (PHPTOV) main settings
Parameter
Start value
Time multiplier
Operate delay time
1)
Operating curve type
1) For further reference, see the Operation characteristics table
Table 41. Three-phase thermal overload protection, two time constants (T2PTTR)
Characteristic
Operation accuracy
1)
Operate time accuracy
1) Overload current > 1.2 x Operate level temperature
40
Start value
U = 1.1 × set
Fault
, f = 50 Hz, overvoltage in one phase-to-phase with nominal frequency injected from random phase angle, results based on statistical
n n
, Start value multiples in range of 1.10...2.00
Function
PHPTOV
PHPTOV
PHPTOV
PHPTOV
Value
Depending on the frequency of the measured voltage: f
±1.5% of the set value or ±0.002 × U
Minimum Typical
23 ms 27 ms
Typically 40 ms
Relative hysteresis
Depends on the set
<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 , where n = 2, 3, 4, 5,...
n
Value (Range)
0.05...1.60 × U
n
0.05...15.00
40...300000 ms
Definite or inverse time
Curve type: 5, 15, 17, 18, 19, 20
Value
Depending on the frequency of the measured current: f
Current measurement: ±1.5% of the set value or ±0.002 x I
in the range of 0.01...4.00 x I )
n
±2.0% of the theoretical value or ±0.50 s
1MRS756891 M
±2 Hz
n
n
Maximum
31 ms
3)
Step
0.01
0.01
10
±2 Hz
n
(at currents
n
ABB