Research — Illustrative (draft, unvalidated)
DER cease-to-energize time
When an island forms, the DER must stop energizing within a default of 2.0 s. Drag the trip time past the 2.0 s mark to watch the verdict flip, or switch on a utility override to tighten the limit or loosen it up to the 5.0 s mutual-agreement ceiling.
Timeline · island forms at t = 0, DER trip time, operative maximum
Measured trip time
Override maximum · illustrative; capped at the 5.0 s Clause 8.1.2 ceiling
Cease-to-energize status
Measured
Maximum
Margin
How the check read it
Client-side port:the logic and table in this page are a TypeScript port of the harness function, checked against values exported from the Python tests. Not a live API call. Domain maturity, quoted from the research page: “Draft, unvalidated. No DER interconnection or protection engineer has reviewed it; every function has only an AI-assisted pre-review. IEEE 1547-2018 is paywalled, so subclause numbers are mostly single-source. The FERC screens are confirmed against authoritative copies.” Clause 8.1.1's exact sentence and sub-subclause digit are moderate-confidence secondary corroboration, not read from a primary copy, and IEEE 1547-2018 is paywalled. The override values on this page are illustrative inputs: the harness currently ships no real utility override data. Whether a “before the first reclose interval” nuance changes the 8.1.1 clearing time is disputed between secondary sources and is deliberately not modeled.Real function this maps to:
check_der_cease_to_energize_time.Not modeled: only the cease-to-energize trip-time comparison, not the harness's other 14 interconnection checks. Also not modeled: how the island is detected, the DER's actual response, the reclose-interval nuance, and any real utility's override value or jurisdiction edition lookup.See also:Cease-to-energize, auto sweep · Ride-through, interactive