Subaru impreza 2017, Owner'S Manual

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supervision element and the integrated directional comparison
function.
The protection has an integrated directional feature. As the operating quantity
current I
op
is always used, the polarizing method is determined by the parameter
setting polMethod . The polarizing quantity will be selected by the function in one
of the following three ways:
1. When polMethod = Voltage , UPol will be used as polarizing quantity.
2. When polMethod = Current , IPol will be used as polarizing quantity.
3. When polMethod = Dual , UPol + IPol · ZNPol will be used as polarizing
quantity.
The operating and polarizing quantity are then used inside the directional element,
as shown in Figure
44 , in order to determine the direction of the earth fault.
STRV
0.6 * IN>DIR
STFW
-RCA -85 deg
40% of
IN>DIR
IN>DIR
RCA
65°
U = -3U
pol 0
I = 3I
op 0
RCA +85 deg
RCA -85 deg
Characteristic
for STRV
Operating area
Operating area
Characteristic
for STFW
Characteristic for reverse
release of measuring steps
Characteristic for forward
release of measuring steps
-RCA +85 deg
IEC11000243-1-en.ai
IEC11000243 V1 EN-US
Figure 44: Operating characteristic for earth-fault directional element using
the zero sequence components
The relevant setting parameters for the directional supervision element are:
1MRK 505 384-UEN A
Section 6
Current protection
Breaker protection REQ650 2.2 IEC 119
Technical manual