Table 29. Three-phase directional overcurrent protection (DPHxPDOC)
Characteristic Value
Operation accuracy At the frequency f = f
n
DPHLPDOC
Current:
±1.5% of the set value or ±0.002 x I
n
Voltage:
±1.5% of the set value or ±0.002 x U
n
Phase angle:
±2°
DPHHPDOC Current:
±1.5% of the 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
)
Voltage:
±1.5% of the set value or ±0.002 x U
n
Phase angle:
±2°
Start time
1)2)
I
Fault
= 2.0 x set Start
value
Typical: 24 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
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)
Measurement mode = default (depends of stage), current before fault = 0.0 x 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)
Maximum Start value = 2.5 x I
n
, Start value multiples in range of 1.5 to 20
Transformer Protection and Control 1MRS756788 A
RET630
Product version: 1.0 Issued: 15.09.2009
26 ABB
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