ABB RELION 615 Series Product Manual page 36

Transformer Protection and Control
RET615
Product version: 5.0 FP1
Protection functions
Table 29. Three-phase non-directional overcurrent protection (PHxPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
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 30. Three-phase non-directional overcurrent protection (PHxPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
1)
Operating curve type
1) For further reference, see the Operation characteristics table
36
PHLPTOC
PHHPTOC
and
PHIPTOC
PHIPTOC:
Start value
I = 2 × set
Fault
Start value
I = 10 × set
Fault
PHHPTOC and PHLPTOC:
Start value
I = 2 × set
Fault
Function
PHLPTOC
PHHPTOC
PHIPTOC
PHLPTOC and PHHPTOC
PHLPTOC and PHHPTOC
PHIPTOC
PHLPTOC
PHHPTOC
PHIPTOC
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 × I
±1.5% of set value or ±0.002 × I
(at currents in the range of 0.1...10 × I
±5.0% of the set value
(at currents in the range of 10...40 × I
Minimum Typical
16 ms 19 ms
11 ms 12 ms
23 ms 26 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: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Peak-to-Peak: No suppression
P-to-P+backup: No suppression
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
1MRS756891 M
±2 Hz
n
n
n
)
n
)
n
Maximum
23 ms
14 ms
29 ms
3)
Step
0.01
0.01
0.01
0.01
10
10
ABB