Product Overview

The 30kVA oil immersed power transformer is a fully sealed, three phase, oil immersed, low loss small distribution transformer. It uses high quality silicon steel sheets and high purity copper/aluminum windings, combined with transformer oil insulation and heat dissipation, making it safe, stable, economical, and durable. The whole unit has a compact structure, low loss, low noise, strong overload capacity, and long service life.

30kVA oil immersed power transformer can operate reliably for a long time in environments such as outdoor areas, distribution areas, small factories, rural power grids, and prefabricated substations. It is widely used in industrial, construction, municipal, overseas small power grids, and public utility scenarios.

30kVA oil immersed power transformers have a wide range of applications: they can be used as step down transformers to meet various voltage conversion needs, and are also suitable for small capacity power supply systems, or as three phase distribution transformers in industrial power systems. With mature standardized design and large scale production, we maintain a reasonable inventory level to support rapid delivery. We manufacture strictly according to multiple international and regional standards such as IEC, GB, JIS, ANSI, IEEE, and UL, meeting Level 1/Level 2 energy efficiency requirements. All products have passed factory testing and authoritative certifications.

Product Advantages

Fully sealed structure, leak proof, maintenance free, and stable and reliable in long term operation.
Oil immersed transformers offer excellent insulation and heat dissipation, strong overload capacity, and adaptability to harsh outdoor environments.
Low loss and high efficiency, significantly reducing operating energy consumption and operating costs.
Compact structure, small footprint, easy installation, and strong adaptability.
High cost effectiveness, long service life, and lower overall operation and maintenance costs.
Short circuit resistant and impact resistant, meeting the requirements for long term continuous load operation.

power transformer and distribution transformer

Technical Specifications

Parameters	Technical Specifications
Model	Oil immersed transformer
Rated capacity	30kVA (customizable upon request)
Input voltage (high voltage)	6.6kV, 10kV, 11kV, 20kV, 35kV (customization available upon request)
Output voltage (low voltage)	0.38kV, 0.4kV (customizable upon request)
Voltage regulation range	±5%, ±2×2.5% (customizable upon request)
Number of phases	Three phase (single phase can also be specified)
Frequency	50Hz/60Hz
Link Group	Dyn11,Yyn0,Yd11,Dyn5(Customization available upon request)
Winding material	Copper / Aluminum
No load loss	Meets national standards / IEC Level 1 / Level 2 energy efficiency
Load loss	Meets national standards / IEC Level 1 / Level 2 energy efficiency
No load current	Standard design values, low loss optimization
Temperature rise limit	≤60K (oil top layer)
Short circuit impedance	Customization available upon request
Cooling method	ONAN (oil immersed and self cooled)
Insulation class	Grade A
Partial discharge	≤20pC (Standard requirement)
Standard	IEC,GB,JIS,ANSI,IEEE,UL

product-800-892

product-800-782

Oil Immersed Transformer FAQ

1. What is the difference between oil immersed and dry type transformers?

Oil immersed uses mineral oil for cooling and insulation. It costs less, handles higher overloads, and lasts longer outdoors. Dry type is maintenance‑free and fire‑safe indoors.

2. Where can I install an oil immersed transformer? Do I need fire protection?

Typically outdoors – substations, industrial plants, solar farms. Indoors requires a fire‑rated vault or oil containment pit due to flammability.

3. What maintenance does an oil immersed transformer require?

Periodic oil testing (dielectric strength, moisture, dissolved gases), filter regeneration, and inspection of bushings, gaskets, and cooling fans. With proper care, service life exceeds 30 years.

product-800-809