Sensitive Directional Residual Overcurrent And Power Protection Sdepsde; Identification; Functionality - ABB REC650 Technical Manual

Section 6
Current protection
6.5
6.5.1
6.5.2
110
Function
Minimum polarizing voltage, Zero
sequence
Minimum polarizing voltage,
Negative sequence
Minimum polarizing current, Zero
sequence
Minimum polarizing current,
Negative sequence
Real part of source Z used for
current polarization
Imaginary part of source Z used
for current polarization
Operate time, non-directional
start function
Reset time, non-directional start
function
Operate time, directional start
function
Reset time, directional start
function
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off.
Sensitive directional residual overcurrent and power
protection SDEPSDE

Identification

Function description
Sensitive directional residual over
current and power protection

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
3I ·j, or residual power component 3U
0
also available one non-directional 3I
tripping step.
Range or value
UBase
(1–100)% of
UBase
(1–100)% of
IBase
(2–100)% of
IBase
(2–100)% of
(0.50-1000.00) W/phase
(0.50–3000.00) W/phase
30 ms typically at 0.5 to 2 x I
set
30 ms typically at 2 to 0.5 x I
set
30 ms typically at 0,5 to 2 x I
N
30 ms typically at 2 to 0,5 x I
N
IEC 61850 IEC 60617
identification identification
SDEPSDE -
·cos j, for operating quantity. There is
·3I
0 0
step and one non-directional 3U
0
1MRK 511 287-UEN A
Accuracy
± 0.5% of U
r
± 0.5% of U
r
±1.0% of I
r
±1.0% of I
r
-
-
-
-
-
-
ANSI/IEEE C37.2
device number
67N
·cosj or
0
overvoltage
0
Technical manual