ABB Relion RES670, Technical Manual

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input BLKx. The trip signals from the function can be blocked from the binary input
BLKTR.
8.2.7.8 Directional supervision element with integrated directional comparison
function
M13941-179 v11
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 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 , 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
60 , in order to determine the direction of the ground fault.
1MRK 511 408-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.2 ANSI 205
Technical manual