Table 38. Three phase undervoltage protection (PHPTUV)
Characteristic Value
Operation accuracy Depending on the frequency of the voltage measured: fn
±2 Hz
±1.5% of the set value or ±0.002 x U
n
Start time
1)2)
Minimum Typical Maximum
U
Fault
= 0.9 x set
Start value
62 ms 64 ms 66 ms
Reset time < 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 x f
n
, where n = 2, 3, 4, 5,…
1)
Start value
= 1.0 x U
n
, Voltage before fault = 1.1 x U
n
, f
n
= 50 Hz, undervoltage 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) Minimum
Start value
= 0.50,
Start value
multiples in range of 0.90 to 0.20
Table 39. Three-phase undervoltage protection (PHPTUV) main settings
Parameter
Function Value (Range) Step
Start value PHPTUV 0.05...1.20 x U
n
0.01
Time multiplier PHPTUV 0.05...15.00 0.01
Operate delay time PHPTUV 60...300000 ms 10
Operating curve type
1)
PHPTUV Definite or inverse time
Curve type: 5, 15, 21, 22, 23
1) For further reference please refer to the Operating characteristics table
Table 40. Thermal overload protection, two time constants (T2PTTR)
Characteristic
Value
Operation accuracy Depending on the frequency of the current measured: f
n
±2 Hz
Current measurement: ±1.5% of the set value or ±0.002
x I
n
(at currents in the range of 0.01...4.00 x I
n
)
Operate time accuracy
1)
±2.0% of the theoretical value or ±0.50 s
1) Overload current > 1.2 x Operate level temperature
Transformer Protection and Control
1MRS756891 F
RET615
Product version: 4.0
40 ABB
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