Public evidence

electrical.transformer_sizing

Machine-checked verification for calculation version 1.0.0 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Ideal lossless transformer; no magnetizing current

Declared partition coverage: PASS · 4/4 declared partitions (ratio, va, current, invalid-domain)
Versions: Calculation 1.0.0 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 2/2 property · digest 5f95b8721e75

Verification

Legacy regression suite: 7/7 calculation tests · Production surface contract 5/5

Three distinct suites: educational examples on the calculator page, this legacy regression count (7/7 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.0.0. CVP 1.0.0-proposed. 3/3 golden · 2/2 CVP boundary · 1/1 invalid · 2/2 property · 2/2 metamorphic · 1/1 cross-interface · 5/5 CVP contract. digest 5f95b8721e75.

Golden (oracle-backed) 3 / 3
CVP boundary 2 / 2
Invalid input 1 / 1
Property 2 / 2
Metamorphic 2 / 2
Cross-interface 1 / 1
CVP contract 5 / 5
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
rest success payload validates schema PASS

Fingerprint sha256:126857d7f05e657625aca33f824937c61bf37030c81b62b305ca22659254e2fa

Input schema sha256:7b1e7e421f474d00ad0349882e095fb62eb05d32d582469929f65b9d9d15fac6 · Output schema sha256:17155b5d5cfc2ffeb6a4c78e8f9384d8648aecfde0599eacd6b33d684b65f7ee · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: transformer-sizing
Engine: transformer-sizing
Engine build: 2026-09-10
Evidence core: 2026-09-06T13:16:40.891Z
Rendered: 2026-11-10T05:18:41.758Z
Last reviewed: 2026-08-08

Limitations

Ideal lossless single-phase

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

IEC 60076 — Power transformers (concepts) — Ideal transformer ratios
Supports: Voltage/turns and VA basics
Chapman — Electric Machinery Fundamentals — Ideal transformer
Supports: Vp/Vs = Np/Ns and VA conservation

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.