RelayRanger

RelayRanger is a web + desktop app for transmission protection engineers to sanity-check and regression-test relay settings and logic changes before they’re deployed. It ingests vendor setting files (starting with the most common formats), compares versions, flags risky deltas (pickup changes, time dial shifts, logic edits), and runs a lightweight simulation against a library of typical fault scenarios and CT/PT ratios. The output is a clear, auditable report: what changed, what it affects, and which tests passed/failed. This is not a full power-system transient simulator; it’s a pragmatic “settings QA” layer that catches human error, copy/paste mistakes, and unintended coordination breaks. It also supports approval workflows and evidence packages for NERC PRC documentation, reducing time spent assembling screenshots and spreadsheets. Realistically, it wins by being faster and narrower than heavyweight engineering suites, not by replacing them.