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8.3.7.6
Directional supervision element with integrated directional comparison
function
GUID-F54E21F7-7C99-41D6-BEC6-2D6EC6D2B2A3 v3
At least one of the four negative sequence overcurrent steps must be set
as directional in order to enable execution of the directional supervision
element and the integrated directional comparison function.
The operating and polarizing quantity are then used inside the directional element, as
shown in figure
, to determine the direction of the fault.
AngleRCA
Forward
Area
Iop = I2
Vpol=-V2
Reverse
Area
ANSI10000031-1-en.vsd
ANSI10000031 V1 EN-US
Figure 67:
Operating characteristic for fault directional element
Two relevant setting parameters for directional supervision element are:
•
Directional element is internally enable to trip as soon as Iop is bigger than 40% of
INDirPU
and the directional condition is fulfilled in set direction.
•
Relay characteristic angle
AngleRCA
which defines the position of forward and
reverse areas in the operating characteristic.
1MRK 511 408-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.2 ANSI
225
Technical manual
Содержание Relion RES670
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