Table 54. Three-phase directional overcurrent protection (DPHxPDOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the current/voltage measured: f
n
±2 Hz
DPHLPDOC
Current:
±1.5% of the set value or ±0.002 × I
n
Voltage:
±1.5% of the set value or ±0.002 × U
n
Phase angle: ±2°
DPHHPDOC
Current:
±1.5% of the 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
)
Voltage:
±1.5% of the set value or ±0.002 × U
n
Phase angle: ±2°
Start time
1)2)
Minimum
Typical
Maximum
I
Fault
= 2.0 × set
Start value
39 ms
43 ms
47 ms
Reset time
Typically 40 ms
Reset ratio
Typically 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
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Measurement mode and Pol quantity = default, current before fault = 0.0 × I
n
, voltage before fault = 1.0 × U
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 × I
n
,
Start value multiples in range of 1.5...20
Table 55. Three-phase directional overcurrent protection (DPHxPDOC) main settings
Parameter
Function
Value (Range)
Step
Start value
DPHLPDOC
0.05...5.00 × I
n
0.01
DPHHPDOC
0.10...40.00 × I
n
0.01
Time multiplier
DPHxPDOC
0.025...15.000
0.005
Operate delay time
DPHxPDOC
40...300000 ms
10
Directional mode
DPHxPDOC
1 = Non-directional
2 = Forward
3 = Reverse
-
Characteristic angle
DPHxPDOC
-179...180°
1
Operating curve type
1)
DPHLPDOC
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
DPHHPDOC
Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
1)
For further reference, see the Operating characteristics table
1MRS759144 A
REX640
Product version: 1
ABB
45
Summary of Contents for RELION REX640
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