ABB Relion 650 Series Technical Manual page 185

1MRK 506 326-UUS B
The protection has integrated directional feature. As the operating quantity current Iop 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 93, in order to determine the direction of the ground fault.
0.6·INDirPU
ANSI07000066 V2 EN-US
Figure 93: Operating characteristic for ground-fault directional element
Two relevant setting parameters for directional supervision element are:
• Directional element will be internally enabled to operate as soon as Iop is bigger than 40% of
INDirPU and directional condition is fulfilled in set direction.
• Relay characteristic angle
in the operating characteristic.
Directional comparison step, built-in within directional supervision element, will set EF4PTOC
(51N/67N) function output binary signals:
Line distance protection REL650
Technical manual
polMethod = Voltage , VVPol will be used as polarizing quantity.
polMethod = Current , VIpol will be used as polarizing quantity.
polMethod = Dual , VTotPol will be used as polarizing quantity.
Reverse
Area
AngleRCA
INDirPU
Iop=3I
AngleRCA , which defines the position of forward and reverse areas
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Forward
Area
o
ANSI07000066-2-en.vsd
Current protection
polMethod . The polarizing
VPol=-3V
o
Section 6
179