Line to Line Impedance

 

 

 

Description

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:

 

 

Where,

 

Phase voltage

Phase current

Input Parameters

Main Data

 

Initialization