Protection functions
Table 27. Three-phase non-directional overcurrent protection (PHxPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
PHLPTOC
±1.5% of the set value or ±0.002 × I
n
PHHPTOC
and
PHIPTOC
±1.5% of 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
)
Start time
1)2)
Minimum
Typical
Maximum
PHIPTOC:
I
Fault
= 2 × set
Start value
I
Fault
= 10 × set
Start value
16 ms
11 ms
19 ms
12 ms
23 ms
14 ms
PHHPTOC and PHLPTOC:
I
Fault
= 2 × set
Start value
23 ms
26 ms
29 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<30 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
RMS: No suppression
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
P-to-P+backup: No suppression
1)
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
2)
Includes the delay of the signal output contact
3)
Includes the delay of the heavy-duty output contact
Table 28. Three-phase non-directional overcurrent protection (PHxPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value
PHLPTOC
0.05...5.00 × I
n
0.01
PHHPTOC
0.10...40.00 × I
n
0.01
PHIPTOC
1.00...40.00 × I
n
0.01
Time multiplier
PHLPTOC and PHHPTOC
0.05...15.00
0.01
Operate delay time
PHLPTOC and 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 the Operation characteristics table
Capacitor Bank Protection and Control
1MRS757952 D
REV615
Product version: 5.0 FP1
ABB
27
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