fully -sealed -transformer

This oil-immersed three-phase transformer is a high-efficiency power distribution device for industrial, commercial and municipal grid systems. Featuring 315kVA–31500kVA capacity and 380V/400V output, it adopts premium core and copper/aluminum coil structure. With reliable oil cooling insulation, low loss, low noise and strong environmental adaptability, it delivers stable, durable and energy-saving operation with full ISO9001 and CCC quality certification.

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E-mail：jh.power@jihuielec.com

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Item	Specification
Application	Power, Electronic
Phase	Three‑phase
Core Type	Core‑type Transformer
Cooling Method	Oil‑immersed Type Transformer
Winding Form	Two‑winding Transformer
Certification	ISO9001‑2000, ISO9001, CCC
Usage	Power Transformer, Distribution Transformer
Frequency Characteristic	Power Frequency
Core Shape	Ring
Brand	Jh/Jshs
Transport Package	Wooden Case
Specification	800‑31500 kVA
Trademark	JH / JSHS
Place of Origin	China
Coil Structure	Layer Coil
Rated Capacity	315 kVA
Winding Material	Copper/Aluminum
Output Voltage	380V, 400V

The oil-immersed transformer is a high-efficiency core device for power transmission and distribution, widely applied in industrial power supply, commercial distribution and municipal grid systems. Adopting advanced oil-immersed cooling and insulation technology, it delivers stable and reliable power conversion in various complex environments. This product series features a capacity range of 315kVA to 31500kVA and standard output voltages of 380V/400V, perfectly catering to diverse power demands of small, medium and large engineering projects.

It adopts a core-type structure and layered coil design, with high-quality iron core that effectively reduces magnetic and no-load loss for higher energy efficiency. The coil is made of premium copper or aluminum, ensuring stable electrical performance and strong resistance to current impact. Using special transformer oil as cooling and insulation medium, this transformer boasts fast heat dissipation, low operating temperature, strong overload capacity and superior high-voltage insulation, far outperforming ordinary dry-type transformers in environmental adaptability.

This three-phase two-winding transformer fits standard power frequency systems, ideal for power stations, industrial parks, urban and rural power grids, and mining facilities. It stands out with simple structure, stable operation, long service life and low maintenance costs. Certified with ISO9001 and CCC, all products undergo strict quality inspection during production. The ring core design optimizes magnetic circuit, lowers operating noise and achieves energy-saving operation. Manufactured with standardized processes, our products have gained wide recognition in global markets.

All transformers are packed in standard wooden cases to prevent collision, extrusion and moisture damage during long-distance transportation. With excellent environmental adaptability, the equipment can operate stably in high-temperature, humid and other harsh outdoor scenarios, suitable for both civil and industrial power distribution.

After-sales Service & Quality Guarantee

We provide reliable, customer-oriented after-sales guarantee for all oil-immersed transformers. All products are manufactured in line with international standards with stable and durable performance. A professional long-term warranty is offered: free maintenance, part replacement and technical support are provided for non-human-induced quality faults under normal installation and operation during the warranty period.

We offer full-cycle technical support, including free pre-sales parameter consultation, solution matching and installation guidance. Detailed English operation manuals and fault troubleshooting guides are provided for users. Our team supports 24/7 online technical consultation to timely solve problems about equipment operation, parameter adjustment and daily maintenance.

Free return, replacement and on-site maintenance are available for manufacturing defects within the warranty scope. For normal aging and wear failures, we provide cost-effective paid maintenance and accessory replacement with transparent pricing and complete spare parts supply, ensuring long-term stable operation of your equipment.

We provide regular after-sales follow-up service to monitor equipment operation and remind users of daily maintenance, effectively reducing failure rates and extending transformer service life. Supported by a complete quality control and after-sales system, we deliver high-quality products and thoughtful full-service support to create stable value for global power distribution projects.