MiCOM Z-Graph

MiCOM Z-Graph, developed by ALSTOM, is a specialized engineering tool for configuring and validating distance protection schemes on transmission and subtransmission networks. It plots relay impedance characteristics on an R–X diagram, giving protection engineers a clear, visual way to set and verify zone reaches, directionality, and fault coverage. By translating settings into intuitive impedance plots, MiCOM Z-Graph helps reduce configuration errors, streamline commissioning, and support thorough design reviews.

Key capabilities:

• Plot and visualize distance protection characteristics on the R–X plane
• Configure and verify zone settings for phase and ground faults
• Assess coverage relative to line and system impedances and typical operating conditions
• Compare alternative settings and scenarios to optimize protection margins
• Generate clear plots and summaries for documentation and audits

Designed to complement MiCOM protection relays, MiCOM Z-Graph supports efficient, repeatable workflows for setting analysis and reporting, helping utilities and consultants deliver reliable, standards-aligned protection performance.

MiCOM Z-Graph is developed by ALSTOM. The name of the program executable file is MiCOM Z-Graph.exe. This particular product is not fit to be reviewed by our informers.

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