Table 40. Phase reversal protection (PREVPTOC)
Characteristic Value
Operation accuracy At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
n
Start time
1)2)
I
Fault
= 2.0 x set Start
value
Typical 25 ms (±15 ms)
Reset time < 40 ms
Reset ratio Typical 0.96
Retardation time < 35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
1) Negative-sequence current before = 0.0 × I
n
, f
n
= 50 Hz
2) Includes the delay of the signal output contact
Table 41. Phase reversal protection (PREVPTOC) main settings
Parameter
Function Value (Range) Step
Start value PREVPTOC 0.05...1.00 pu 0.01
Operate delay time PREVPTOC 0.100...30.000 s 0.001
Table 42. Three-phase thermal overload protection for motors (MPTTR)
Characteristic
Value
Operation accuracy At the frequency f = f
n
Current measurement:
±1.5% of the set value or ±0.002 × I
n
(at currents in the range of 0.01...4.00 × I
n
)
Operate time accuracy
1)
±2.0% or ±0.050 s
1) Overload current > 1.2 × Operate level temperature
Motor Protection and Control 1MRS756977 D
REM630
Product version: 1.1 Issued: 2011-05-18
ABB 35
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