42
R E F61 5 A N S I 5.0 FP1
FEED ER P R OT EC T I O N A N D CO N T R O L
—
Table 32. Three-phase directional overcurrent protection (DPHxPDOC)
Characteristic
Value
Operation accuracy
DPHLPDOC
Depending on the frequency of the measured current: fn ±2 Hz
±1.5% of the set value or ±0.002 x I
n
DPHHPDOC
±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)
Minimum
Typical
Maximum
I
Fault
= 2.0 x 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: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,…
1) Measurement mode and Pol quantity = default, current before fault = 0.0 × In, 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
1) For further reference, see the Operation characteristics table
—
Table 33. 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
0.05...15.00
0.01
Operate delay time
DPHxPDOC
40...200000 ms
10
Directional mode
DPHxPDOC
1 = Non-directional
2 = Forward
3 = Reverse
-
Characteristic angle
DPHxPDOC
-179...180°
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
