Microgrid & Distributed Energy Equipment worked example

Protection Relay Test Capacity at 65% test bench uptime: a worked example

This worked example runs the protection relay test capacity numbers for a tougher week than the baseline: 65% test bench uptime instead of the typical 90%. Estimate how many protection relays a microgrid and distributed energy test bench can verify per shift, after bench uptime and first-pass test yield, so teams can confirm test capacity covers the relay count before committing the schedule.

The inputs for this scenario

  • Relays tested per cycle: 4 relays / cycle (held at the documented default)
  • Available test cycles: 480 cycles (held at the documented default)
  • Test bench uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • First-pass test yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross protection relay test capacity = relays tested per cycle × available test cycles.
  • Good protection relay test capacity works out to 1,211 relays at these inputs, and this is the headline figure for the scenario.
  • Gross protection relay test capacity works out to 1,920 relays at these inputs.
  • Protection relay test capacity downtime loss works out to 672 relays at these inputs.
  • Protection relay test capacity yield loss works out to 37.44 relays at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where test bench uptime sits at 90% and the headline result is 1,676 relays, this scenario comes in 27.78% below the baseline at 1,211 relays.
  • Use it when scheduling relay test labor, sizing test-bench capacity against a build plan, or finding why relay testing is delaying shipments. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Good protection relay test capacity: 1,211 relays (headline result)
  • Gross protection relay test capacity: 1,920 relays
  • Protection relay test capacity downtime loss: 672 relays
  • Protection relay test capacity yield loss: 37.44 relays

Run it with your numbers

  • To rerun this with your own numbers, open the live Protection Relay Test Capacity calculator, set test bench uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.