ABB REX640 - Table 151. Underpower Factor Protection (MPUPF); Table 152. Underpower Factor Protection (MPUPF) Main Settings

Table 150. Stabilized and instantaneous differential protection for machines (MPDIF) main settings
Parameter Function Value (Range) Step
Low operate value MPDIF 5...30 %Ir 1
High operate value MPDIF 100...1000 %Ir 10
Slope section 2 MPDIF 10...50% 1
End section 1 MPDIF 0...100 %Ir 1
End section 2 MPDIF 100...300 %Ir 1
DC restrain enable MPDIF 0 = False
1 = True
-
CT connection type MPDIF 1 = Type 1
2 = Type 2
-
CT ratio Cor Line MPDIF 0.40...4.00 0.01
CT ratio Cor Neut MPDIF 0.40...4.00 0.01
Table 151. Underpower factor protection (MPUPF)
Characteristic
Value
Operation accuracy Dependent on the frequency of the current measured: f
n
±2 Hz
±0.018 for power factor
Operate time accuracy ±(1.0% or 30 ms)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5, 6, 7
Reset time <40 ms
Table 152. Underpower factor protection (MPUPF) main settings
Parameter
Function Value (Range) Step
Min operate current MPUPF 0.05...0.65 × I
n
0.01
Min operate voltage MPUPF 0.05...0.50 × U
n
0.01
Disable time MPUPF 0...60000 ms 1
Voltage reversal MPUPF 0 = No
1 = Yes
-
Table 153. Stabilized and instantaneous differential protection for two- or three-winding transformers (TR3PTDF)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±3.0% of the set value or ±0.002 × I
n
Start time
1)2)
Low stage
High stage
Minimum Typical Maximum
30 ms
17 ms
35 ms
18 ms
40 ms
20 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5...
1) Current before fault = 0.0 × I
n
, f
n
= 50 Hz. Injected differential current = 2.0 × set operation value.
2) Measured with static power output (SPO)
1MRS759144 A
REX640
Product version: 1
76 ABB