6.5 Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
6.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Sensitive directional residual over
current and power protection
SDEPSDE - 67N
6.5.2 Functionality
In isolated networks or in networks with high impedance grounding, the ground fault
current is significantly smaller than the short circuit currents. In addition to this, the
magnitude of the fault current is almost independent on the fault location in the network.
The protection can be selected to use either the residual current, 3I
0
·cosj or 3I
0
·j, or
residual power component 3V
0
·3I
0
·cos j, for operating quantity. There is also available
one non-directional 3I
0
step and one non-directional 3V
0
overvoltage tripping step.
6.5.3 Function block
ANSI08000036-1-en.vsd
SDEPSDE (67N)
I3P*
V3P*
BLOCK
BLKVN
TRIP
TRDIRIN
TRNDIN
TRVN
PICKUP
PUDIRIN
PUNDIN
PUVN
PUFW
PUREV
CND
VNREL
ANSI08000036 V1 EN
Figure 43: SDEPSDE (67N) function block
Section 6 1MRK 511 287-UUS A
Current protection
116
Technical manual
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