Source: https://guthlabs.ai/docs/instruments/transformer-efficiency-losses-estimator/implementation/

instrument implementation / implementation-contract

# Transformer Efficiency & Losses Estimator implementation

A source-bound implementation contract for Transformer Efficiency & Losses Estimator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-066

**Effect**: Computation or source lookup only

## Input and validation requirements

The zero-output, zero-loss combination produces an undefined 0/0 efficiency, and the specification does not define behavior for load fractions above 1.0 or the PF unit convention.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "rated_VA": 1000,
    "copper_loss_full_load_W": 40,
    "core_loss_W": 10,
    "PF": 0.8,
    "load_fraction": 0.5
  },
  "expected_outputs": {
    "Pout_W": 400,
    "Pcu_W": 10,
    "Pfe_W": 10,
    "total_loss_W": 20,
    "efficiency": 0.9523809523809523,
    "efficiency_percent": 95.23809523809523
  },
  "working": "Pout=1000×0.5×0.8=400 W. Pcu=40×0.5²=40×0.25=10 W. Pfe=10 W. Total loss=10+10=20 W. η=400/(400+10+10)=400/420=20/21=0.9523809523809523=95.23809523809523%."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/transformer-efficiency-losses-estimator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/transformer-efficiency-losses-estimator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/transformer-efficiency-losses-estimator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`