Three-Phase Directional Overcurrent Protection (Dphxpdoc) Main Settings; Non-Directional Earth-Fault Protection (Efxptoc) - ABB RET620 Product Manual

Transformer Protection and Control
RET620
Product version: 2.0
Table 32. Three-phase directional overcurrent protection (DPHxPDOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
Directional mode
Characteristic angle
1)
Operating curve type
1) For further reference, refer to the Operating characteristics table
Table 33. Non-directional earth-fault protection (EFxPTOC)
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) Measurement mode = default (depends on stage), current before fault = 0.0 x I
on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Start value = 2.5 x I Start value multiples in range of 1.5 to 20
3) Maximum ,
n
28
Function
DPHLPDOC
DPHHPDOC
DPHxPDOC
DPHxPDOC
DPHxPDOC
DPHxPDOC
DPHLPDOC
DPHHPDOC
EFLPTOC
EFHPTOC
and
EFIPTOC
EFIPTOC:
Start value
I = 2 x set
Fault
Start value
I = 10 x set
Fault
EFHPTOC and EFLPTOC:
I = 2 x set Start value
Fault
, f
n n
Value (Range)
0.05...5.00 x In
0.10...40.00 x In
0.05...15.00
40...200000 ms
1 = Non-directional
2 = Forward
3 = Reverse
-179...180 deg
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
Value
Depending on the frequency of the current measured: f
±1.5% of the set value or ±0.002 x I
±1.5% of set value or ±0.002 x I
(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
22 ms
< 40 ms
Typical 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 x f
n
Peak-to-Peak: No suppression
= 50 Hz, earth-fault current with nominal frequency injected from random phase angle, results based
1MRS757846 A
Step
0.01
0.01
0.01
10
1
n
n
)
n
)
n
Typical Maximum
19 ms 23 ms
12 ms 14 ms
24 ms 25 ms
3)
, where n = 2, 3, 4, 5,...
±2 Hz
n
ABB