400 Hz solid-state ground power units (30–90 kVA) — the specs and standards that define a procurement
Every parked aircraft needs 400 Hz power, and how an airport delivers it — solidstate converter, diesel GPU, or central system — shapes fuel cost, noise, emissions and gate turnaround. This brief covers what actually…
Every parked aircraft needs 400 Hz power, and how an airport delivers it — solid-state converter, diesel GPU, or central system — shapes fuel cost, noise, emissions and gate turnaround. This brief covers what actually defines a procurement for fixed solid-state ground power units in the 30–90 kVA class, using a representative current-generation unit (Sinepower's SINEGPU range, 30/45/60/90 kVA) to anchor the numbers.
The standards that gate the purchase
A compliant 400 Hz GPU quote should reference, at minimum:
- ISO 6858 — aircraft ground support electrical supplies
- SAE ARP 5015 — performance requirements for 400 Hz ground power
- MIL-STD-704 — aircraft electrical power characteristics (military and many bizav specs)
- EMC: EN 61000-6-4 (emissions) and EN 61000-6-2 (immunity)
- Safety: IEC 62477-1 (power-electronic converter safety), IEC 60529 (IP rating)
- Environmental type tests: dry heat (IEC 60068-2-2), damp heat (-2-78), vibration (-2-6), salt mist (-2-52), dust/sand (-2-68) — these matter directly for Gulf installations.
If a datasheet can't show these, the unit isn't apron-grade.
Electrical numbers that matter
| Parameter | What good looks like (30–90 kVA solid-state class) |
|---|---|
| Output | 3-phase 200 V AC, 400 Hz ±1%, frequency stability ±0.01% (crystal-controlled) |
| Input | 3-phase 400/415 V ±10%, 50/60 Hz |
| Overall efficiency | 90–95% (rectifier 95–97%, inverter 95–98%) |
| Power factor correction | PF = 1 at input, THDi < 2% at full load |
| Static regulation | ±1% from 0–100% load |
| Dynamic regulation | recovery to 1% within ~20 ms after a 100% load step |
| Overload profile | ~120% for 600 s, 150% for 60 s, 200% for 2–5 s |
| Standby losses | "green standby" of ~20 W, no-load losses < 1% |
Two features worth specifying explicitly:
- No-break power transfer (NBPT) compatibility — the aircraft sees no interruption when switching between GPU and APU/another source; 4-quadrant converter operation makes this safer and is now standard on better units.
- Automatic voltage-drop compensation — load-dependent or via remote feedback at the aircraft plug, so the 200 V is held at the aircraft, not at the GPU output terminals. Plug-and-play compensation removes a commissioning adjustment.
Environment and enclosure
For Gulf aprons, check: ambient rating to at least +40 °C forced-air (with -40 °C low end for highland/military sites), IP54–IP55 enclosure, C5-M marine-grade coating where coastal, altitude rating (typically 2,000 m standard), and 0–90% non-condensing humidity. A 90 kVA-class fixed unit is roughly a 750 × 750 × 1,250 mm cabinet — small enough for gate or hangar wall placement.
What defines the quote
Suppliers will price against: kVA rating (30/45/60/90 are the standard steps — size to the largest aircraft type at the stand, not the average), fixed vs mobile mounting, cable length and aircraft plug count (single or dual 400 Hz outlets), NBPT requirement, input voltage at site, and any military spec (MIL-STD-704) requirement. Manufacturers in this space include Sinepower (Portugal), ITW GSE, Guinault and Powervamp. Fixed units are built to order — confirm lead time with the manufacturer at quote stage.
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