Table 32. Non-directional earth-fault protection (EFxPTOC)
Characteristic Value
Operation accuracy At the frequency f = f
n
EFLPTOC
±1.5% of the set value or ±0.001 x I
n
EFHPTOC
and
EFIPTOC
±1.5% of set value or ±0.002 x I
n
(at currents in the range of 0.1…10 x I
n
)
±5.0% of the set value
(at currents in the range of 10…40 x I
n
)
Start time
1)2)
EFIPTOC:
I
Fault
= 2 x set Start
value
Typical 12 ms (±5 ms)
EFHPTOC:
I
Fault
= 2 x set Start
value
Typical 19 ms (±5 ms)
EFLPTOC:
I
Fault
= 2 x set Start
value
Typical 23 ms (±15 ms)
Reset time < 45 ms
Reset ratio Typical 0.96
Retardation time < 30 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 RMS: No suppression
DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
Peak-to-Peak: No suppression
1)
Operate curve type = IEC definite time, Measurement mode = default (depends on stage), current before fault =
0.0 x I
n
, f
n
= 50 Hz, earth-fault current 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 = 2.5 x I
n
, Start value multiples in range of 1.5 to 20
Motor Protection and Control 1MRS756977 D
REM630
Product version: 1.1 Issued: 2011-05-18
30 ABB
To Next Page
Loading...
