ABB REG630 - Key Protection Function Details; 30. Three-phase non-directional overcurrent protection

Protection functions
Table 30. 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 × I
n
PHHPTOC
and
PHIPTOC
±1.5% of set value or ±0.002 × I
n
(at currents in the range of 0.1…10 × I
n
)
±5.0% of the set value
(at currents in the range of 10…40 × I
n
)
Start time
1)2)
PHIPTOC:
I
Fault
= 2 × set Start value
I
Fault
= 10 × set Start value
Typically 17 ms (±5 ms)
Typically 10 ms (±5 ms)
PHHPTOC:
I
Fault
= 2 × set Start value Typically 19 ms (±5 ms)
PHLPTOC:
I
Fault
= 2 × set Start value Typically 23 ms (±15 ms)
Reset time <45 ms
Reset ratio Typically 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 × 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 × I
n
, f
n
= 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
Generator Protection and Control
1MRS757583 C
REG630
Product version: 1.3
26 ABB