S11 Fully Sealed 500kVA /13.8kV Three-Phase Oil-Immersed Power Transformer

Technical Parameters
Rated capacity: 500KVA
High-voltage side voltage: 13.8KV
Low-voltage side voltage: Can be set as required
Frequency: 50Hz
Impedance voltage: Meets standard regulations
Insulation heat resistance grade: Class A

Energy-saving and low-consumption: Adopts high-quality iron cores and windings to effectively reduce losses and save energy costs. For example, the S11-M-500/13.8 model uses new energy-saving materials, cutting energy consumption by roughly 15% versus conventional transformers.

Safe and reliable: Fully sealed structure delivers waterproof, moisture-proof and oxidation-resistant performance for steady operation and elevated safety. Its proprietary sealing technology isolates the internal components from external humidity, dust and air exposure, effectively slowing insulating oil oxidation, extending oil replacement cycles and lengthening the maintenance-free service interval. This design drastically lowers breakdown risks and cuts routine upkeep workload for end users.

Overload capacity: It tolerates overload within a specific range to fit special operating conditions. During unexpected load surges, the S11-M-500/13.8 transformer can run stably for a certain period, reserving sufficient time for maintenance and parameter adjustment.

Manufacturing Process

Precise winding: Advanced winding machinery guarantees accurate turn counts and tidy coil arrangement. For windings of the S11-M-500/13.8 unit, tension and gap values are tightly controlled to deliver superior electromagnetic performance. Vacuum impregnation: This process boosts insulation strength and prolongs overall service life. Insulating oil processed under vacuum fully fills gaps inside windings to reinforce insulation reliability. Strict inspection: Multi-stage quality checks cover every transformer unit. From incoming raw material verification to pre-delivery finished product testing, the S11-M-500/13.8 undergoes layered quality screening before shipment.

This project is a complete power distribution upgrade for an Australian coastal aluminum processing plant. The factory operates 24/7 with high environmental requirements, featuring heavy dust, high humidity, and salty coastal air, making regular transformer oil inspection and maintenance extremely inconvenient.

For the overall power distribution framework, we adopted a graded power supply solution to match the plant's load characteristics: Multiple 1600kVA high-voltage main transformers are deployed as the core power station to step down 13.8kV grid voltage and bear the total load of the smelting workshop. Meanwhile, multiple sets of S11-M-500/13.8 fully sealed oil-immersed transformers are configured for zoning power supply for auxiliary production equipment, cooling systems, and workshop electrical control units.

Different from open-type transformers, the fully sealed structure of the S11-M-500 model effectively isolates external moisture, salt spray and dust, prevents insulating oil oxidation, and achieves a long maintenance-free cycle. Its low-loss performance and strong short-time overload capacity perfectly adapt to the intermittent peak load of aluminum processing auxiliary equipment, ensuring stable and continuous power supply for the entire plant while reducing later operation and maintenance costs.

Q1: What are the standard technical application scenarios for S11-M-500/13.8 transformers?

A: Rated at 500kVA / 13.8kV, this fully sealed transformer is technically optimized for continuous-duty industrial environments. It adapts to high humidity, coastal salt spray and dusty workshops, complying with IEC 60076 standard, and is mainly used for graded auxiliary power distribution in metallurgical and processing plants.

Q2: What technical and data advantages does the fully sealed structure have over conventional oil-immersed transformers?

A: The all-welded fully sealed structure eliminates breathing gap, completely avoiding insulating oil oxidation and moisture ingress. Test data verifies that it reduces no-load loss by 15% compared with S9 models, achieves 10+ years maintenance-free oil cycle, and effectively lowers long-term operating loss and failure rate.

Q3: What is the technical matching logic of 500kVA transformer in aluminum plant power distribution system?

A: The plant adopts hierarchical power distribution: 1600kVA main transformers undertake heavy smelting main load, while S11-M-500/13.8 transformers undertake zoned auxiliary load. It supports standard intermittent peak overload operation, stabilizes auxiliary loop voltage, and forms a technically reasonable high-low matching power distribution scheme.

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