ABB RET670 - Sensitive Directional Residual Overcurrent and Power Protection SDEPSDE (67 N)

Name Values (Range) Unit Step Default Description
t4Min 0.000 - 60.000 s 0.001 0.000 Minimum operate time in inverse curves step 4
MultPU4 1.0 - 10.0 - 0.1 2.0 Multiplier for scaling the current setting value
for step 4
ResetTypeCrv4 Instantaneous
IEC Reset
ANSI reset
- - Instantaneous Reset curve type for step 4
tReset4 0.000 - 60.000 s 0.001 0.020 Reset time delay for step 4
tPCrv4 0.005 - 3.000 - 0.001 1.000 Parameter P for customer programmable
curve for step 4
tACrv4 0.005 - 200.000 - 0.001 13.500 Parameter A for customer programmable
curve step 4
tBCrv4 0.00 - 20.00 - 0.01 0.00 Parameter B for customer programmable
curve for step 4
tCCrv4 0.1 - 10.0 - 0.1 1.0 Parameter C for customer programmable
curve step 4
tPRCrv4 0.005 - 3.000 - 0.001 0.500 Parameter PR for customer programmable
curve step 4
tTRCrv4 0.005 - 100.000 - 0.001 13.500 Parameter TR for customer programmable
curve step 4
tCRCrv4 0.1 - 10.0 - 0.1 1.0 Parameter CR for customer programmable
curve step 4
3.7.6 Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Sensitive directional residual over
current and power protection
SDEPSDE - 67N
3.7.6.1 Application
In networks with high impedance grounding, the phase-to-ground fault current is
significantly smaller than the short circuit currents. Another difficulty for ground-fault
protection is that the magnitude of the phase-to-ground fault current is almost
independent of the fault location in the network.
Directional residual current can be used to detect and give selective trip of phase-to-
ground faults in high impedance grounded networks. The protection uses the residual
current component 3I
0
· cos φ, where φ is the angle between the residual current and
1MRK504116-UUS C Section 3
IED application
451
Application manual