ABB RET620 - Three Phase Undervoltage Protection (PHPTUV); Three-Phase Undervoltage Protection (PHPTUV) Main Settings; Three-Phase Overvoltage Protection (PHPTOV)

Table 41. 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 42. 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, see Operation characteristics table
Table 43. 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
Transformer Protection and Control
1MRS757846 A
RET620
Product version: 2.0
ABB 33