Primary switchgear ZHW58A

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Product overview
ZHW58A hybrid gas-insulated switchgear integrates modules such as circuit breaker, DS, ES, CT, PT, FES. It provides a compact footprint, strong environmental adaptability, high reliability and maintenance-free operation. Rated voltages cover 31.5–145 kV, making the product suitable for high-voltage transmission and distribution applications including substations.

Key attributes

• Compact three-phase split-tank structure with integrated base frame
• Superior electrical performance with integral partial discharge <3 pC
• Reliable mechanical performance; mechanical life class M2 with 10,000 operations
• Modular standardized flange connections for flexible configuration and interchangeability

Features

• Compact structure: Three-phase split-tank design and integrated base frame enable bay-level three-phase transport and simplify on-site installation.
• Excellent electrical performance: Enhanced insulation properties, integral partial discharge <3 pC, and a horizontal breaker layout enabling switching capability up to 40 kA.
• Reliable mechanical performance: New integrated die-cast aluminum base spring operating mechanism with compact design and stable output ensures maintenance-free operation; mechanical life meets M2 requirements.
• Highly modular design: Modular approach with standardized flange dimensions allows flexible configuration and easy functional expansion to optimize substation layout.

Technical specifications

• Model: ZHW58A
• Integrated modules: circuit breaker, DS, ES, CT, PT, FES
• Rated voltage (kV): 31.5, 40.5, 72.5, 145
• Rated frequency (Hz): 50/60
• Rated current (A): up to 4000
• Rated short-circuit breaking current (kA): up to 40
• Rated short-circuit making current (peak) (kA): up to 108
• Rated short-time withstand current (kA): up to 40 for 4 s
• Rated peak withstand current (kA): up to 108
• Rated operating sequence: O-0.3s-CO-3min-CO
• Mechanical endurance: 10,000 operations (M2 class)
• Partial discharge: integral <3 pC
• Design highlights: three-phase split-tank, integrated base frame, horizontal breaker layout, integrated die-cast aluminum base spring mechanism, modular standardized flange connections