75 kVA ~ 2500 kVA UL-Listed Explosion-Proof Standard Pad-Mounted Transformer

Description:

The UL-Listed Explosion-Proof Standard Pad-Mounted Transformer is an explosion-proof oil-immersed pad-mounted transformer certified by Underwriters Laboratories (UL), designed specifically for hazardous environments. Its core certifications and standards include:

• UL Certification: Complies with UL 506 (Transformer Standard) and UL 1203 (Explosion-Proof Equipment Standard), ensuring safe operation in dangerous environments.
• Explosion-Proof Rating: Typically marked as Class I, Division 1 (for flammable gas environments) or Class II, Division 1 (for combustible dust environments), adhering to the National Electrical Code (NEC 500/505).
• Structural Standards: Based on IEEE C57.12.20 (American Pad-Mounted Transformer Standard) and NEMA 3R/4X (Enclosure Rating Standards).

Core Design Features:

• Explosion-Proof Enclosure: Constructed with cast aluminum or stainless steel, joint surfaces and gaps strictly comply with UL 1203 (e.g., gap ≤0.15mm) to prevent flame propagation during internal arcing.
• Pressure Relief System: Equipped with dual redundant pressure relief valves (operating pressure 55±5kPa) and spark arrestors to prevent tank rupture and secondary explosions.
• Oil-Immersed Insulation: Utilizes high-flash-point insulating oil (e.g., silicone oil with flash point >300°C) or β-fluid (complying with UL 3406) to reduce fire risks.
• Sealing Rating: Features fully welded construction with corrugated tanks, passing UL 50E explosion tests (methane-air mixture explosion test) to prevent ingress of combustible substances.
• Electrical Connections: Equipped with explosion-proof cable glands (UL 1203 certified) and Ex d-type flameproof joints to ensure sparks at terminals do not ignite ambient gases.

Functions and Core Applications:

• Safe Power Supply: Enables electrical energy conversion in flammable environments while preventing sparks or high temperatures from triggering explosions.
• Fault Isolation: Contains internal faults (e.g., arcing, oil decomposition) within the enclosure through explosion-proof design.
• Environmental Adaptation: With IP66 protection rating, resists ingress of corrosive gases and dust.

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