Table 30. Three-phase non-directional overcurrent protection (PHxPTOC) main settings
Parameter
Function
Value (Range)
Step
Start Value
PHLPTOC
0.05...5.00 x I
n
0.01
PHHPTOC
0.10...40.00 x I
n
0.01
PHIPTOC
1.00...40.00 x I
n
0.01
Time multiplier
PHLPTOC
0.05...15.00
0.01
PHHPTOC
0.05...15.00
0.01
Operate delay time
PHLPTOC
40...200000 ms
10
PHHPTOC
40...200000 ms
10
PHIPTOC
20...200000 ms
10
Operating curve type
1)
PHLPTOC
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
PHHPTOC
Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
PHIPTOC
Definite time
1)
For further reference, see Operation characteristics table
Table 31. 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 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)
Minimum
Typical
Maximum
I
Fault
= 2.0 x set
Start value
38 ms
43 ms
46 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: -50 dB 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
Transformer Protection and Control
1MRS757846 A
RET620
Product version: 2.0
ABB
27