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If the polarity of the voltage signals is opposite to the normal polarity, the correction can
be done by setting
Voltage reversal
to "Yes", which rotates the impedance vector by 180
degrees.
If the magnitude of the voltage is less than 0.05 · V
N
, the calculated impedance is not
reliable and the impedance calculation is disabled. V
N
is the rated phase-to-phase voltage.
The calculated impedance magnitudes and angles are available in the Monitored data
view. The impedance angles are provided between -180...180 degrees.
The calculated apparent impedance is converted to pu impedance as the
operating characteristics are defined with the pu settings.
Impedance reach check
The operating characteristic is a circular offset mho on the impedance plane. The
operating characteristics are defined with the
Offset
,
Diameter
and
Displacement
settings.
If the calculated impedance value enters the circle in the impedance plane, the module
sends an enabling signal to start the Timer.
Section 4
1MAC059074-MB A
Protection functions
698
615 series ANSI
Technical Manual
Содержание Relion 615 series
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