Function Range or value Accuracy
Minimum trip current, step 1
- 4
(1.00 - 10000.00)% of
IBase
±1.0% of I
n
at I ≤ I
n
±1.0% of I at I > I
n
Relay characteristic angle
(RCA)
(-180 to 180) degrees
±2.0 degrees
Trip current for directional
release
(1–100)% of
IBase
For RCA ±60 degrees:
±2.5% of I
n
at I ≤ I
n
±2.5% of I at I > I
n
Minimum polarizing voltage (1–100)% of
VBase
±0.5% of V
n
Minimum polarizing current (2-100)% of
IBase
±1.0% of I
n
Real part of negative
sequence source impedance
used for current polarization
(0.50-1000.00) W/phase
-
Imaginary part of negative
sequence source impedance
used for current polarization
(0.50–3000.00) W/phase
-
Trip time, pickup non-
directional at 0 to 2 x I
set
Min. = 15 ms
Max. = 30 ms
-
Reset time, pickup non-
directional at 2 to 0 x I
set
Min. = 15 ms
Max. = 30 ms
-
Trip time, pickup non-
directional at 0 to 10 x I
set
Min. = 5 ms
Max. = 20 ms
-
Reset time, pickup non-
directional at 10 to 0 x I
set
Min. = 20 ms
Max. = 35 ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
Transient overreach <10% at τ = 100 ms -
8.6 Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
SEMOD171436-1 v4
8.6.1 Identification
SEMOD172025-2 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Sensitive directional residual over
current and power protection
SDEPSDE - 67N
8.6.2 Functionality
SEMOD171959-4 v11
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
Section 8 1MRK 502 066-UUS B
Current protection
504
Technical manual
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