ABB REM615 ANSI - Page 25

ABB 25
Motor Protection
REM615 ANSI
Product Version 2.0
1MAC251744 -PG Rev. A
Issued: 03.01.2010
Table 36. Positive sequence undervoltage protection (27PS)
Characteristic Value
Pickup
accuracy
Depending on the frequency of the voltage
measured: fn ±2Hz
±1.5% of the set value or ±0.002 x U
n
Pickup time
1) 2)
U
Fault
= 0.99 x set Pickup range Minimum Typical Maximum
51 ms 53 ms 54 ms
U
Fault
= 0.9 x set Pickup range 43 ms 45 ms 46 ms
Reset time < 40 ms
Reset ratio Depends on the set Relative hysteresis
Retardation time < 35 ms
Trip time accuracy in de nite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50dB at f = n x f
n
,
where n = 2, 3, 4, 5,…
1)
Pickup range = 1.0 x U
n
, Positive sequence voltage before fault 1.1 x U
n
, f
n
= 50 Hz, positive sequence undervoltage with nominal frequence
injected from random phase angle, results based on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact
Table 37. Positive sequence undervoltage protection (27PS) main settings
Parameter Function Value (Range) Step
Pickup range 27PS 0.010...1.200 x U
n
0.001
De nite time delay 27PS 40...120000 ms 10
Voltage block value 27PS 0.01...1.0 x U
n
0.01
Table 38. Negative sequence overvoltage protection (47)
Characteristic Value
Pickup
accuracy
Depending on the frequency of the voltage
measured: fn ±2Hz
±1.5% of the set value or ±0.002 x U
n
Pickup time
1) 2)
Minimum Typical Maximum
U
Fault
= 1.1 x set Pickup range 33 ms 35 ms 37 ms
U
Fault
= 2.0 x set Pickup range 24 ms 26 ms 28 ms
Reset time < 40 ms
Reset ratio Typical 0.96
Retardation time < 35 ms
Trip time accuracy in de nite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50dB at f = n x f
n
,
where n = 2, 3, 4, 5,…
1)
Negative sequence voltage before fault 0.0 x U
n
, f
n
= 50 Hz, negative sequence overvoltage with nominal frequence injected from random
phase angle, results based on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact