Research — Substation · Precomputed (draft, unvalidated)

Bus scheme and breaker count

One substation, six ways to arrange its buses and breakers. Pick a scheme, a circuit count and how many breakers are installed: the harness says how many that scheme calls for and whether you are short or over. Then break something. Click a breaker (out of service, fails to clear, or bypassed on a main-and-transfer scheme) or a bus, and everything the failure de-energizes goes dark, the open breakers snap open and the circuits that survive are counted. Cycle the scheme chips with the same breaker failed to compare.

Story

Free play · pick a scheme, then click any breaker or bus to fail it

Bus scheme

Circuits

Installed breakers · checked by the harness

When you click a breaker

Every control snaps to a value the harness was run at; the page reads that cell and never estimates between two. The stepper for installed breakers changes only the harness check. The diagram always shows the scheme’s own arrangement and never invents which breaker is missing.

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

Or fail an element from here

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 state · the controlling row is highlighted

Rule column: the citation the data file gives for each check. The harness text for a violation or advisory is reproduced verbatim in the notes under the breaker bay.

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, not a harness result. 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 whose functions have not had a human subject-matter-expert sign-off; nothing here is a compliance determination or a design. Two provenances, tagged on every step. Harness: the required breaker count, the pass / fail / incomplete verdict and the violation and advisory texts, shown verbatim. Demo logic: the harness has no outage model, so which circuits stay energized when a breaker or bus fails, which wires go dark and which breakers open come from this demo's exporter, which walks a graph over generic textbook arrangements it defines itself (not a design, no ratings, no reliability statistic). The geometry is illustrative. The harness names the sectionalized bus but gives it no ratio, so that 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. The ring bus advisory above six circuits is the harness's own note and the verdict stays pass. 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 ratings, bus ratings and ampacity, fault current, maintenance switching sequences, transfer or paralleling logic beyond the generic arrangement drawn, double-failure (N-2) cases, and any real station layout. The drawing is schematic.See also:Bus scheme and breaker count, hands-off walkthrough · Station walk · Generation to rack: power path N-1