1.Product Overview
        The XGN17-40.5 features a metal-enclosed, fixed-compartment structure compliant with GB3906 and IEC 60298 standards. Utilizing air insulation (minimum clearance ≥300mm), its welded steel frame divides into front compartment (operation zone) and rear compartment (cable/bypass zone). Compatible with vacuum circuit breakers (e.g., ZN12-35) or SF₆ circuit breakers (e.g., FP series), it supports bus sectioning and bypass schemes for flexible power distribution. Key design objectives include full-load operation capability, high mechanical endurance (>10,000 operations), and minimal maintenance.

2.Product Functions
Core Functions:
        Power Distribution: Distributes 40.5kV power via main and feeder bus systems.
        Circuit Control: Enables manual/electric switching with remote operation option.
        System Protection: Integrates overcurrent/short-circuit protection (through circuit breakers and relays) with breaking capacity up to 31.5kA.
        Operational Monitoring: Equipped with metering compartment for real-time voltage/current/power measurement (some models feature communication interfaces).

Ancillary Functions:
        Five-Prevention Interlocking: Mechanical interlocks prevent misoperations (e.g., switching under load).
        Bypass Supply: Enables maintenance without interruption via bypass bus.
        Safety Protection: Automatic insulating shutters shield live contacts; voltage indicators display energization status.

3.Product Composition
Enclosure Structure:
        Front Compartment: Busbar compartment (top), circuit breaker compartment (center), relay compartment (front). Busbar and breaker zones separated by insulated barriers with bushing connections.
        Rear Compartment: Cable compartment, bypass bus zone, and mounting positions for VTs/arresters. Rear door features mechanical locking and live-part blocking.

Key Components:
        Circuit Breaker: Vacuum type (e.g., ZN12-35, 2000A) or SF₆ type (e.g., FP series) for primary circuit interruption.
        Disconnector: Provides visible isolation gap; mechanically interlocked with breaker.
        Instrument Transformers: Current transformers (CTs) for measurement/protection; voltage transformers (VTs) for voltage monitoring.
        Operating Mechanism: Spring-operated, motor/manual charging.
        Protection Relay: Integrates overcurrent/earth fault protection.

Technical Parameters
Electrical Specifications:
        Rated frequency: 50Hz;
        Power frequency withstand voltage: 95kV/1min (main circuit), 118kV/1min (isolation gap);
        Lightning impulse withstand voltage: 185kV (main circuit), 215kV (isolation gap).

Mechanical Specifications:
        Mechanical endurance: >10,000 operations (circuit breaker);
        Operating sequence: O-0.3s-CO-180s-CO (auto-reclosing cycle).

Environmental Compliance:
        Temperature range: -25℃ to +40℃ (extendable to -40℃ with special design);
        Altitude limit: ≤1000m (derating required above);
        Humidity: ≤95% daily average (at +25℃);
        Seismic withstand: Intensity 8.

Model & Dimensions
        Model: Base model XGN17-40.5, with variants (e.g., XGN17C-40.5 for enhanced configuration)
        Dimensions (W×D×H): Standard type ≈1918mm×2950mm×3100mm; Bypass bus type ≈1918mm×3250mm×3125mm or 2020mm×3650mm×3400mm (varies by manufacturer)