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Protection functions
—
Table 30. Three-phase non-directional overcurrent protection (PHxPTOC)
Characteristic
PHLPTOC
Operation accuracy
PHHPTOC
and
PHIPTOC
PHIPTOC:
I
= 2 x set Start value
Start time
(2), (3)
Fault
I
= 10 x set Start value
Fault
PHHPTOC and PHLPTOC:
I
= 2 x set Start value
Fault
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1 Not included in REM615
2 Set Operate delay time = 0,02 s, Operate curve type = IEC definite time, Measurement mode = default (depends on stage), current before fault = 0.0 × In, fn = 50 Hz, fault current in
one phase with nominal frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
3 Includes the delay of the signal output contact
4 Includes the delay of the heavy-duty output contact
—
Table 31. Three-phase non-directional overcurrent protection (PHxPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
Operating curve type
(2)
1 Not included in this product
2 For further reference, see the Operation characteristics table
Value
Depending on the frequency of the measured current: fn ±2 Hz
±1.5% of the set value or ±0.002 x I
±1.5% of set value or ±0.002 x I
(1)
(at currents in the range of 0.1...10 x I
±5.0% of the set value
(at currents in the range of 10...40 x I
Minimum
16 ms
11 ms
23 ms
Typically 40 ms
Typically 0.96
< 30 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
RMS: No suppression
DFT: -50dB at f =
n x f
, where n = 2, 3, 4, 5,...
n
Peak-to-Peak: No suppression
P-to-P+backup: No suppression
Function
PHLPTOC
PHHPTOC
(1)
PHIPTOC
PHIPTOC
PHLPTOC and PHHPTOC
PHIPTOC
PHLPTOC
PHHPTOC
(1)
PHIPTOC
n
n
)
n
)
n
Typical
19 ms
12 ms
26 ms
(4)
Value (range)
0.05...5.00 × I
n
0.10...40.00 × I
n
1.00...40.00 × I
n
0.05...15.00
40...200000 ms
20...200000 ms
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
Definite time
Maximum
23 ms
14 ms
29 ms
Step
0.01
0.01
0.01
0.01
10
10
29
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