Protection functions
Table 27. Three-phase non-directional overcurrent protection (PHxPTOC)
Characteristic
Value
Operation accuracy
At the frequency f = f
n
PHLPTOC
±1.5% of the set value or ±0.002 x I
n
PHHPTOC
and
PHIPTOC
±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)
PHIPTOC:
I
Fault
= 2 x set
Start
value
I
Fault
= 10 x set
Start
value
Typical: 17 ms (±5 ms)
Typical: 10 ms (±5 ms)
PHHPTOC:
I
Fault
= 2 x set
Start
value
Typical: 19 ms (±5 ms)
PHLPTOC:
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: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
Peak-to-Peak: No suppression
P-to-P+backup: No suppression
1) Set
Operate delay time
= 0,02 s,
Operate curve type
= IEC definite time,
Measurement mode
= default (depends on
stage), current before fault = 0.0 x In, fn = 50 Hz, fault current in one 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) Includes the delay of the heavy-duty output contact
Feeder Protection and Control
1MRS756380 A
REF630
Product version: 1.0
Issued: 15.09.2009
26
ABB
Summary of Contents for REF630
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