Function Range or value Accuracy
Minimum polarizing voltage, Zero
sequence
(1–100)% of
UBase
± 0.5% of U
r
Minimum polarizing voltage,
Negative sequence
(1–100)% of
UBase
± 0.5% of U
r
Minimum polarizing current, Zero
sequence
(2–100)% of
IBase
±1.0% of I
r
Minimum polarizing current,
Negative sequence
(2–100)% of
IBase
±1.0% of I
r
Real part of source Z used for
current polarization
(0.50-1000.00) W/phase
-
Imaginary part of source Z used
for current polarization
(0.50–3000.00) W/phase
-
Operate time, non-directional
start function
30 ms typically at 0.5 to 2 x I
set
-
Reset time, non-directional start
function
30 ms typically at 2 to 0.5 x I
set
-
Operate time, directional start
function
30 ms typically at 0,5 to 2 x I
N
-
Reset time, directional start
function
30 ms typically at 2 to 0,5 x I
N
-
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off.
8.3 Sensitive directional residual overcurrent and power
protection SDEPSDE
8.3.1 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
8.3.2 Functionality
In isolated networks or in networks with high impedance earthing, the earth 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 3U
0
·3I
0
·cos j, for operating quantity. There is
also available one non-directional 3I
0
step and one non-directional 3U
0
overvoltage
tripping step.
1MRK 502 048-UEN A Section 8
Current protection
203
Technical manual
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