Fully Sealed Oil-Immersed Distribution Transformer

Contact Ceho to purchase this advanced Fully Sealed Oil-Immersed Distribution Transformer now. Three-phase flat-wound core fully sealed distribution transformers with a capacity range of 30kVA to 1000kVA, comprising 15 models; the core features a three-phase, three-column inner-outer frame winding structure. High degree of mechanization; high and low voltage windings are continuously wound on the core columns, ensuring excellent concentricity and compact winding; key technical and economic indicators meet internationally advanced standards for comparable products.

Implementation Standards

◇GB1094.1~2-2013 Power Transformers

◇GB1094.3-2003 Power Transformers

◇GB/T1094.4-2005 Power Transformers

◇GB1094.5-2008 Power Transformers

◇GB/T6451-2015 Technical Parameters and Requirements for Three-Phase Oil-immersed Power Transformers

◇International Standard IEC76

◇GB/T25289-2010 Technical Parameters and Requirements for 20kV Oil-immersed Power Transformers

Structural Features

● Fully Sealed Oil-Immersed Distribution Transformer adopts a three-phase, three-column inner-outer frame rolled structure with a multi-step circular cross-section core column. The rolled core undergoes vacuum annealing to relieve stresses. Channel-shaped bent clamping pieces secure the body with tensioning screws. The core surface is coated with specialized adhesive to prevent deformation and rust.

● Low-voltage windings consist of 1 to 6 conductors wound in parallel, configured as either four-layer or double-layer cylindrical windings (for 500KVA and below) or spiral windings (for 630KVA and above). All conductors are drawn from oxygen-free copper. Interlayer insulation for high/low-voltage windings uses diamond-patterned adhesive paper. Axial oil channels in high-voltage windings and main oil gaps between high/low-voltage sections employ a support-strip curtain structure. Iron insulation and trapezoidal spacers are integrated to ensure uniform pressure distribution across the core. The core utilizes a novel lifting plate positioning structure with longitudinal and transverse alignment to guarantee stability and prevent displacement.

● The transformer features a sealed corrugated oil tank design that is leak-proof and maintenance-free.

Specification

Power Range: 30 kVA to 2500 kVA

Voltage Levels: Up to 36 kV

Cooling Method: ONAN (Oil Natural Air Natural)

Vector Group: Dyn11 or Yyn0

Standards: IEC 60076, ANSI, etc.

FAQ

What is Fully Sealed Oil-Immersed Distribution Transformer?

Three-phase oil-immersed transformer, a power transformer cooled and insulated by insulating oil.It is designed for use in three-phase AC power systems and converts high-voltage electrical energy into low-voltage electrical energy.It has a wide range of applications in industrial, commercial and power grid distribution.

What are the typical application scenarios for this transformer?

Voltage conversion in urban distribution networks;

Distribution of mining, petrochemical and other industrial plants;

Grid connection of renewable energy power plants;

Hospitals, data centers and other locations requiring high reliability power.

What is the rated capacity range?

Common capacities range from 25kVA to 10MVA, with 100kVA to 2000kVA models at 10kV/400V being the most widely used, depending on load requirements.

What is the difference between the maintenance cycles of 10kV dry-type transformers and oil-immersed transformers?

Dry type: dust removal inspection every 2-3 years; oil immersion type: oil level, oil quality (pressure resistance value, acidity), sealing and radiator cleanliness inspection once a year; comprehensive oil sample inspection every 3-5 years (such as dielectric loss and moisture content).

How to choose oil-immersed distribution transformer and dry-type transformer?

- 10kV oil-immersed transformer is suitable for outdoor, high-capacity, high-load scenarios, low cost, but requires regular maintenance;

-10kV dry-type transformer: for indoor environments with high fire protection requirements, maintenance-free but expensive.