Overview
ISO 24065:2023 - Aerospace - High‑power solid‑state power controller (HPSSPC) - General performance requirements defines the general performance requirements and test methods for HPSSPCs used in the primary power distribution of aircraft. Published October 2023, this first‑edition ISO standard addresses the needs of higher‑voltage, higher‑current aircraft electrical systems and complements existing SSPC guidance by providing requirements specific to high‑power applications.
Key topics and technical requirements
ISO 24065:2023 covers functional, electrical and test-oriented aspects of HPSSPCs, including:
- Control signals - definitions and required behavior for turn‑on and turn‑off commands (including command data packets via control buses).
- Timing characteristics - turn‑on and turn‑off time, load voltage rise and fall time (soft on/off), and distinctions for DC, non‑zero‑crossing AC, and zero‑crossing AC operation.
- Electrical characteristics - isolation, control signal levels, voltage drop, off‑state leakage current, off‑state output voltage and power dissipation.
- Protection and performance - overload characteristics, current limiting, trip‑free behavior and setting changes for rated current.
- AC‑specific functions - zero‑voltage turn‑on (ZVTO) and zero‑current turn‑off (ZCTO), reverse current handling, and exponential rate of voltage rise.
- Safety and fault handling - arc fault detection and response, including specified arc‑fault tests (guillotine, wet arc fault, intermittent connection) and compatibility checks with normal loads and other line faults.
- Diagnostics - built‑in test (BIT) functions and state indication outputs for health monitoring and status reporting.
- Quality assurance - test methods and verification procedures for electrical characteristics and performance.
Practical applications and who uses this standard
ISO 24065:2023 is intended for stakeholders involved in design, production, verification and certification of aircraft primary power systems:
- Aircraft manufacturers and power‑distribution system designers specifying HPSSPC performance.
- Avionics and electrical engineers developing HPSSPC hardware and control firmware.
- Component and subsystem suppliers validating compliance and performing type or acceptance testing.
- Test laboratories and certification authorities assessing conformity with aerospace performance and safety requirements.
- Systems integrators ensuring compatibility of HPSSPCs with aircraft electrical architectures.
Typical applications include high‑power circuit switching, load protection and fault isolation in primary aircraft distribution networks where solid‑state switching advantages (fast control, soft‑start/stop, fault detection) are required.
Related standards
- ISO 27027 - SSPC standard for lower electrical power supply (related background).
- ISO 1540 - Aerospace - Characteristics of aircraft electrical systems (normative reference).
- ISO 7137:1995 - Environmental conditions and test procedures for airborne equipment (normative reference).
Keywords: ISO 24065:2023, HPSSPC, high‑power solid‑state power controller, aerospace, primary power distribution, performance requirements, test methods, arc fault, zero‑voltage turn‑on, built‑in test.
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