XIAOWEI pitches dry-type and oil-immersed transformers for indoor substations

Jiangsu Xiaowei Electric says indoor substations, hospitals, data centers and high-rise buildings need different transformer designs depending on fire safety, cooling and maintenance needs. The company contrasts its cast resin dry-type line with its oil-immersed units and points buyers to its engineering support and online portal.

Why it matters: - Indoor substations face a tradeoff between fire safety and operating efficiency. - Dry-type transformers reduce indoor fire risk and simplify building code compliance. - Oil-immersed transformers offer higher thermal overload capacity and stronger cooling for heavy-duty loads. - The choice affects civil construction cost, maintenance workload and long-term power losses.

What happened: - Jiangsu Xiaowei Electric Co., Ltd. outlined how it positions dry-type and oil-immersed transformers for indoor commercial substations and other dense urban power sites. - The company framed the decision around fire hazard classification, thermal overload endurance, civil engineering needs and life-cycle efficiency. - XIAOWEI said its portfolio includes SCB series cast resin dry-type transformers and S series liquid-immersed transformers.

The details: - XIAOWEI says its epoxy resin cast dry-type transformers use VPI or solid cast resin technology under IEC 60076-11 standards. - The dry-type units use Class F 155°C or Class H 180°C non-flammable insulation systems. - The company says the solid epoxy structure achieves F1 self-extinguishing fire performance. - Dry-type transformers produce no flammable liquid runoff and emit zero toxic smoke in the event of flashover or severe short circuit, according to the company. - XIAOWEI says that reduces the need for fire-rated separation walls, liquid containment sumps and deluge suppression systems. - The dry-type units are offered with IP20 or IP23 enclosures and can be placed near indoor load centers. - XIAOWEI’s oil-immersed transformers range from 50kVA to 5000kVA, including 500kVA 22.9kV to 0.4kV step-down units. - The liquid-immersed line uses refined mineral oil compliant with IEC 60296 or FR3 natural ester vegetable oil. - XIAOWEI says liquid dielectric fluid in ONAN cooling removes heat more effectively than ambient air during continuous heavy operation. - FR3 natural ester fluid has a fire point above 300°C, according to the company. - The oil-immersed units use sealed corrugated tanks to help isolate oil from moisture and salt spray. - XIAOWEI says its core and winding design, including cold-rolled silicon steel and paper-covered copper windings, can reach peak operating efficiency of 99.16%. - Dry-type transformers can be installed on standard reinforced concrete floors or mezzanines because they do not require oil containment infrastructure. - With digital temperature controllers and forced-air cooling, XIAOWEI says dry-type transformers can sustain 30% to 50% more load than self-cooling operation. - Dry-type maintenance is limited to visual checks, dust removal and terminal torque verification, according to the company. - Oil-immersed transformers require dielectric sampling, moisture testing, dissolved gas analysis and leak checks. - XIAOWEI says direct factory production includes full acceptance testing before shipment, covering winding resistance, voltage ratio, impedance, losses and dielectric withstand. - The company says it maintains a zero fault rate for more than 10 years across global projects, including utility deployments in Paraguay.

Between the lines: - The pitch is aimed at engineers and procurement teams that want one supplier for both fire-safe indoor builds and higher-efficiency liquid-immersed systems. - XIAOWEI is positioning factory-direct manufacturing as a way to reduce risk from trading intermediaries and uncertified components. - The company is also using customization, including IP ratings and harmonic mitigation design, as part of its sales message.

What's next: - XIAOWEI is directing buyers to request CAD drawings, schematics, type test reports and price quotes through its company portal. - The company says its technical sales team can also help with short-circuit calculations, transformer vault layout and fire safety configuration guidance. - Contact options listed include the official company portal and the company’s social channels on Facebook and TikTok.

The bottom line: - XIAOWEI is selling transformer selection as a code-and-cost decision: dry-type for indoor fire safety, oil-immersed for efficiency and overload performance.