Research — Auto Demo · Precomputed (draft, unvalidated)

Bus scheme and breaker count — auto

No controls here: seven short stories play on their own. A single bus loses everything when its bus or a stuck breaker goes. A ring loses two circuits to one stuck breaker. Breaker-and-a-half loses nothing to a bus fault but one or two circuits to a breaker that will not clear. Double breaker and main and transfer buy their way out with more breakers. An odd breaker-and-a-half has no exact target and nothing is drawn. Use Pause, or the story and step buttons, to stop on any frame.

Story

Substation one-line · illustrative geometry, not a design

energizedno powerbreaker closedbreaker open (tripped)failed, out of servicefailed, stuck closed◉ source circuit▽ load circuit

A circuit counts as energized when it is connected to a live source; a supply circuit also needs another circuit terminal in its component, so a source cut off from the station delivers nothing.

Circuits · which ones survive

Breaker bay · installed against what the harness requires

One slot per breaker. The dashed tick marks the harness’s required count for this scheme and circuit count; a dashed slot is a breaker the count wants and the bay lacks, a red one is beyond it.

Compare the schemes · same circuit count, same failure

Every check at this step · the controlling row is highlighted

Rule column: the citation the data file gives for each check.

How the checks read it

Every check · before, the step, the fix

The breaker count is the harness's result. Circuits still energized is demo logic from the exporter's graph walk. There is deliberately no whole-station verdict. Incomplete means the harness has no exact target and skipped the check: it is never a pass.

Precomputed results:every verdict, required value and margin on this page was computed by the real Python harness at export time and is played back from a data file. The page runs no harness logic and holds no standards tables, and it never interpolates between exported values. Not a live API call. Precomputed by the real functions required_breaker_count and check_bus_configuration_breaker_count in usm-agent-harness (commit af9e873), a draft, unvalidated. Steps tagged harness are the harness's breaker-count results, with its violation and advisory texts shown verbatim. Steps tagged demo logic are this demo's exporter: the harness has no outage model, so which circuits stay energized, which parts go dark and which breakers open come from a graph walk over generic textbook arrangements (not a design, no ratings, no reliability statistic). The geometry is illustrative. The sectionalized bus has no harness ratio, so its check is always incomplete and its tie breaker is a drawing choice. Breaker-and-a-half with an odd circuit count has no exact target and nothing is drawn. There is deliberately no whole-station verdict. Domain maturity: starting inventory, not a completed review.Real functions this maps to:required_breaker_count, check_bus_configuration_breaker_count.Not modeled: real outage statistics or reliability, protection and relay coordination, breaker and bus ratings, fault current, maintenance switching, double-failure cases, and any real station layout. The drawing is schematic.See also:Bus scheme and breaker count, interactive with free play · Station walk, hands-off