ABB RELION 670 Series Technical Manual page 490

Section 8
Current protection
BLKTR
EMULTX
IMinx
X
MultPUx
X
Pickupx
BLKx
BLOCK
2ndHarm_BLOCK_Int
HarmRestrainx=Disabled
DirModex=Off
DirModex=Non-directional
DirModex=Forward
DirModex=Reverse
ANSI10000008 V3 EN-US
Figure 254: Simplified logic diagram for residual overcurrent step x, where x = step 1, 2, 3 or 4
The protection can be completely blocked from the binary input BLOCK. Output signals for
respective step, and PUSTx and TRSTx, can be blocked from the binary input BLKx. The trip signals
from the function can be blocked from the binary input BLKTR.
8.4.7.8 Directional supervision element with integrated directional comparison
function
The protection has integrated directional feature. As the operating quantity current lop is always
used. The polarizing method is determined by the parameter setting
quantity will be selected by the function in one of the following three ways:
1. When
2. When
3. When
The operating and polarizing quantity are then used inside the directional element, as shown in
figure 255, in order to determine the direction of the ground fault.
484
Characteristx=DefTime
T
b
a>b
F
a
|I |
OP
a
a>b
b
T
F
Characteristx=Inverse
OR
STEPx_DIR_Int
OR
AND
FORWARD_Int
AND
REVERSE_Int
It shall be noted that at least one of the four residual overcurrent steps shall be set
as directional in order to enable execution of the directional supervision element
and the integrated directional comparison function.
polMethod = Voltage , VPol will be used as polarizing quantity.
polMethod = Current , IPol will be used as polarizing quantity.
polMethod = Dual , VPol + IPol · ZNPol will be used as polarizing quantity.
tx
AND
Inverse
AND
OR
1MRK 502 066-UUS B
AND
OR
tMin
polMethod . The polarizing
TRSTx
PUSTx
ANSI10000008-4-en.vsd
M13941-179 v9
Technical manual