ABB Relion 670 series, Technical Manual

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X
Inverse
tx
OR
|I
OP
|
PUSTx
TRSTx
AND
T
F
HarmRestrainx=Disabled
Pickupx
BLKx
BLOCK
OR
2ndHarm_BLOCK_Int
MultPUx
Characteristx=Inverse
Characteristx=DefTime
DirModex=Off
DirModex=Non-directional
DirModex=Forward
DirModex=Reverse
AND
AND
FORWARD_Int
REVERSE_Int
OR
OR STEPx_DIR_Int
ANSI10000008-4-en.vsd
X
T
F
a
b
a>b
b
a
a>b
IMinx
AND
tMin
BLKTR
AND
EMULTX
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
M13941-179 v9
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.
The protection has integrated directional feature. As the operating quantity current lop 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, VPol will be used as polarizing quantity.
2. When polMethod = Current, IPol will be used as polarizing quantity.
3. When polMethod = Dual, VPol + IPol · ZNPol will be used as polarizing quantity.
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.
Section 8 1MRK 502 066-UUS B
Current protection
484
Technical manual