What are the three main aspects of the "three-proof" requirements for marine generators?

In modern maritime operations, marine generators serve as the heart of a ship, and their operational stability directly impacts navigational safety and power supply. Due to the extremely harsh marine environment, including constant exposure to high salt, high humidity, and mold, high-standard "three-proof" design has become a core indicator of a marine generator set's quality.

I. Moisture-proof

The air humidity at sea is extremely high, especially in tropical waters or environments with large diurnal temperature variations, easily leading to condensation inside the engine room.

Hazards: If the generator windings become damp, it can cause a sharp decline in insulation performance, leading to short circuits or even equipment burnout.

Remedies for Marine Generators: High-quality manufacturers use high-insulation-grade (e.g., H-class insulation) electromagnetic wires and perform multiple vacuum pressure impregnation (VPI) treatments on the stator and rotor. Furthermore, space heaters (moisture-proof heating belts) are usually installed inside the generator, automatically activating during shutdown to keep the internal components dry.

II. Salt Spray Proof

Marine atmospheres contain large amounts of sodium chloride particles, known as salt spray. Salt spray has extremely strong electrochemical corrosiveness.

Hazards: Salt spray accelerates the rusting of metal components and damages the circuit boards of electronic control modules (such as AVR automatic voltage regulators), leading to poor contact or control malfunction.

Remedies for Marine Generators: Structural components require shot blasting and then multiple layers of marine-grade epoxy zinc-rich anti-corrosion paint. Exposed fasteners are typically made of stainless steel or using Dacromet coating. The generator controller is coated with a three-proof paint to ensure uninterrupted signal transmission.

III. Fungus Proof

In the high-temperature, high-humidity, enclosed environment of an engine room, fungus grows readily.

Hazards: The organic acids secreted by fungus corrode insulation materials, causing them to become brittle and detach, and absorb moisture, forming conductive paths.

Marine generator solutions: When selecting seals, gaskets, and non-metallic materials, it is essential to choose synthetic materials with strong anti-mold properties, or to add anti-mold agents to the materials to prevent mold growth and damage to marine electrical equipment at the source.

Additional Considerations When Purchasing Marine Diesel Generator Sets

• Certifications: Check whether the product has classification certifications from authoritative organizations such as CCS (China Classification Society), BV, ABS, or DNV. This is authoritative proof of compliance with "three-proof" standards.
• Protection level: Select an appropriate IP protection level (such as IP23 or higher) based on the installation location (in the engine room or on the deck).
• Cooling system: Pay attention to whether it uses seawater/desalination heat exchange cooling or radiator cooling, as this is closely related to the unit's durability in complex environments.

As a professional marine generator manufacturer, we are well aware of the harshness of the marine environment. Every unit that leaves the factory undergoes rigorous anti-corrosion, moisture-proof, and mildew-proof tests to ensure your journey is powerful and stable.