ABB Relion Technical Manual page 170

Section 7
Impedance protection
164
IEC10000176 V2 EN
Figure 68: Mho, offset mho characteristic for Zone 1 with setting parameters Z1Fwd,
Z1Rev and ImpedanceAng
The three impedance zones can be time delayed individually by setting the parameter tZx
(where x is 1-3 depending on selected zone). For instantaneous operation set the parameter
tZx to 0.00 s for the particular zone. To enable the zone, the operation mode for the zone, x
(where x is 1-3 depending on selected zone), has to be set to Enable-Zone.
The function are blocked in the following ways:
• Activating of input BLOCK blocks the whole function.
• Activating of the input BLKZ (fuse failure) blocks all output signals.
The activation of input signal BLKZ can be made by external or internal fuse failure
function.
X
ImpedanceAng
IEC10000176-2-en.vsd
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