
This component computes the line-to-line impedance as seen by a ground impedance relay. The output impedance is in rectangular format (R and X), and is optimized for use with the Trip Polygon, Distance Relay - Apple Characteristics, Distance Relay - Lens Characteristics or the Mho Circle trip devices as shown below:

The on-line ground impedance is calculated as follows:
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Where,
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Phase voltage |
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Phase current |