Table 26. Three-phase directional overcurrent protection (DPHxPDOC)
Operation
accuracy
Depending on the frequency of the current/voltage measured: f
n
±2Hz
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 set value or ±0.002 x I
n
(at currents in the range of 0.1…10 x I
n
)
±5.0% of 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)
Minimum Typical Maximum
I
Fault
= 2.0 x set Start value 37 ms 40 ms 42 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 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 x I
n
, voltage before fault 1.0 x 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 x I
n
, Start value multiples in range of 1.5 to 20
Table 27. Three-phase directional overcurrent protection (DPHxPDOC) main settings
Parameter Function Value (Range) Step
Start value DPHxPDOC 0.05...5.00 x I
n
0.01
Time multiplier DPHxPDOC 0.05...15.00 0.05
Operate delay time DPHxPDOC 40...200000 ms 10
Directional mode DPHxPDOC 1 = Non-directional
2 = Forward
3 = Reverse
Characteristic angle DPHxPDOC -179...180 degrees 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
DPHHPTOC Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
1) For further reference please refer to the Operating characteristics table at the end of the Technical data chapter
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