Oil Immersed Transformer 15KVA 50KVA 100KVA Three Phase Transformer

Oil Immersed Transformer 15KVA 50KVA 100KVA Three Phase Transformer

1. Product Overview

The Oil Immersed Transformer 15KVA 50KVA 100KVA Three Phase Transformer is a mainstream low and medium capacity distribution transformer widely deployed in residential, commercial and light industrial power grids. Manufactured in strict accordance with IEC 60076 international standards and regional power industry specifications, this three-phase oil immersed power transformer covers three practical capacity grades of 15KVA, 50KVA and 100KVA, fully catering to decentralized power distribution demands for small-load power supply projects worldwide.

Adopting mature oil natural air natural cooling technology and fully sealed structural design, this three-phase oil type transformer uses high-purity mineral insulating oil as cooling and insulation medium to ensure stable voltage conversion and continuous load operation. Available with customizable high and low voltage ratios and 50/60Hz dual frequency adaptation, it can match various regional power grid standards, whether for urban grid renovation, rural power upgrading or temporary on-site power supply. Compared with ordinary dry-type transformers, this oil immersed distribution transformer features better heat dissipation, stronger overload resistance and more affordable overall operating costs, making it the most practical basic power transformation equipment for grassroots power distribution systems.

All finished three-phase oil immersed transformers undergo full factory testing including temperature rise test, partial discharge detection and full-load operation inspection. With reliable structural craftsmanship, low power loss and excellent outdoor environmental adaptability, the 15KVA, 50KVA and 100KVA models have always been hot-selling power equipment for small-capacity power conversion projects, widely recognized by engineering contractors, power grid operators and end users for stable daily operation and low maintenance requirements.

2. Technical Parameters

3. Core Product Features

This series of 15KVA, 50KVA and 100KVA three-phase oil immersed transformers integrates energy-saving optimization, reliable sealing technology and practical industrial design. It balances operational stability, environmental adaptability and cost performance, fully meeting long-term continuous operation requirements of grassroots power distribution systems:

3.1 Low Energy Loss & High Energy Saving Efficiency

The transformer core adopts high-permeability grain-oriented cold-rolled silicon steel sheets with full oblique lap joint technology, which effectively suppresses magnetic flux leakage and greatly reduces iron loss during standby and running status. The precisely arranged winding structure minimizes copper loss under rated load. Compared with traditional old-generation three-phase transformers, this oil immersed power transformer delivers lower no-load and operating loss, effectively reducing daily power consumption and grid line loss for end users, with obvious long-term energy-saving benefits.

3.2 Reliable Oil Immersed Cooling & Insulation Performance

Filled with non-PCB anti-aging mineral insulating oil that meets international environmental protection standards, the three-phase oil transformer forms a natural circulating heat dissipation system. The standard ONAN cooling mode realizes automatic heat exchange without auxiliary cooling equipment, ensuring uniform heat dissipation of core and windings even after 24-hour uninterrupted operation. The fully sealed oil tank structure isolates internal insulating oil from external air and moisture, preventing oil emulsification, oxidation and insulation aging, maintaining stable high insulation performance in various complex weather conditions.

3.3 Stable Voltage Output & Strong Anti-interference Ability

Equipped with professional off-load voltage tapping adjustment function, the equipment can calibrate input voltage deviation within ±5% range to ensure stable 400V low-voltage output. Optional Dyn11 and Yyn0 vector group designs effectively balance three-phase current, suppress grid harmonic interference and voltage fluctuation, and adapt to dynamic load changes of civil electrical equipment and light industrial machinery. It can resist instantaneous grid voltage surge and avoid power supply instability caused by unbalanced load.

3.4 Excellent Weather Resistance & Durable Structure

The whole machine adopts thickened steel plate welding structure and anti-corrosion spray treatment, with outstanding waterproof, dustproof, rust-proof and anti-aging performance. This oil immersed distribution transformer can operate stably in outdoor open-air substations, humid suburban environments and simple indoor distribution rooms, adapting to extreme temperatures and complex climatic conditions all year round. The reinforced internal structure has strong vibration resistance and short-circuit impact resistance, effectively reducing daily equipment failure rate.

3.5 Low Maintenance & High Cost Performance

With simple mechanical structure and few vulnerable parts, this three-phase oil immersed transformer belongs to typical low-maintenance power equipment. The fully sealed maintenance-free design extends the replacement cycle of insulating oil, greatly saving later operation and maintenance manpower and material costs. With stable quality and affordable procurement cost, it is the most cost-effective basic power transformation equipment for small and medium load power distribution projects.

3.6 Safe Operation & Low Noise Design

Optimized core vibration reduction and winding fixing technology effectively control operating noise, meeting urban and rural environmental noise standards. Equipped with standard oil level gauge, temperature detector and pressure relief valve, the transformer can monitor operating oil level and temperature in real time, and automatically release pressure under overheating or overload faults, ensuring safe and reliable operation of the entire power distribution system.

4. Core Product Uses

As essential basic equipment for medium and low voltage power distribution systems, 15KVA, 50KVA and 100KVA three-phase oil immersed transformers undertake core power conversion, voltage stabilization and decentralized power distribution tasks, supporting stable and efficient operation of various small-load power consumption scenarios:

Medium to Low Voltage Step-down Conversion: The core function is to convert 6kV/10kV/11kV medium-voltage grid power into standard 400V low-voltage usable power, realizing safe and effective voltage matching between overhead transmission lines and terminal electrical equipment, which is the foundation of civil and light industrial power supply.

Decentralized Regional Power Distribution: This oil immersed three-phase transformer is suitable for scattered small-area power supply, reasonably distributing grid power according to actual load demand, balancing three-phase load current and reducing transmission line voltage drop and power loss.

Power Supply Quality Optimization & Stabilization: By adjusting off-load tap positions, the equipment calibrates system voltage deviation caused by seasonal load changes and long-distance line transmission loss, stabilizes terminal voltage within standard range, and comprehensively improves regional power supply quality.

Power Grid Fault Isolation & Safety Protection: It isolates the upper medium-voltage power grid and lower low-voltage power consumption system, preventing high-voltage fault surges from spreading to the user side, limiting grid fault scope and reducing terminal equipment damage risks.

Long-term Uninterrupted Power Guarantee: Relying on excellent heat dissipation performance and overload resistance, the three-phase oil transformer supports 24-hour continuous operation, meeting long-term stable power demand of residential areas, public facilities and small industrial sites.

5. Wide Application Scenarios

With diversified capacity options, stable power conversion performance and strong environmental adaptability, this series of three-phase oil immersed transformers is widely applied in global civil power distribution, small industrial power supply, grid renovation and temporary power engineering projects:

5.1 Rural & Residential Power Grid Upgrading

15KVA and 50KVA oil immersed transformers are the most commonly used equipment for rural grid upgrading, village centralized power supply and suburban residential area power distribution. They effectively solve the problems of insufficient power supply capacity and unstable voltage in old rural power grids, improving residents’ daily power consumption stability.

5.2 Small Workshop & Light Industrial Power Supply

50KVA and 100KVA three-phase oil transformers are widely used in small mechanical processing workshops, light industry factories, food processing plants and individual industrial parks. They fully meet the power demand of small production lines and auxiliary mechanical equipment, adapting to long-term stable industrial power consumption.

5.3 Municipal & Public Facility Power Distribution

This series of oil immersed power transformers applies to power supply of urban street lighting, community supporting facilities, rural water pump equipment, scenic area facilities and township public utilities. Its low-noise and stable operation will not affect public living and service environments.

5.4 Construction & Temporary Engineering Power

Thanks to convenient outdoor installation and strong environmental adaptability, 15KVA to 100KVA three-phase oil transformers are commonly used for temporary power guarantee of construction sites, road reconstruction projects and municipal engineering renovation, providing reliable short-term power support for field construction.

5.5 Remote Area Decentralized Power Supply

Ideal for power distribution in remote mountainous areas, pastoral areas and scattered small power consumption points. The oil immersed structure is dust-proof, moisture-proof and weather-resistant, capable of operating stably in harsh outdoor environments and solving power supply difficulties for remote decentralized users.

6. Frequently Asked Questions (FAQ)

Q1: How to choose between 15KVA, 50KVA and 100KVA three-phase oil immersed transformer?

Capacity selection mainly depends on actual peak load and future power expansion plans. The 15KVA oil immersed transformer is suitable for ultra-small load scenarios such as single village power supply, independent water pump equipment and small public facilities, featuring lower no-load loss and better energy-saving effect in light-load operation. The 50KVA model is the most cost-effective choice for ordinary residential communities and small workshops with stable daily power consumption. The 100KVA three-phase oil transformer is designed for scenarios with relatively large power consumption and potential load growth, including concentrated residential areas and small industrial processing sites. All three capacities adopt unified manufacturing standards with consistent safety and environmental adaptability.

Q2: What are the practical advantages of three-phase oil immersed transformer over dry-type transformer?

For conventional outdoor grassroots power distribution projects, oil immersed three-phase transformers have more obvious practical advantages. Adopting insulating oil circulating heat dissipation, this equipment has better heat resistance and short-term overload capacity, supporting long-term outdoor high-temperature operation with more stable performance. Meanwhile, the oil type transformer has simpler internal structure, lower manufacturing cost and more competitive market price. Although it requires regular oil quality inspection, its long-term operation and maintenance cost is much lower than dry-type equipment, making it more suitable for rural grid, municipal public facilities and small industrial power supply scenarios.

Q3: What daily maintenance does this three-phase oil immersed transformer need?

This series of fully sealed oil immersed transformers is designed for low daily maintenance. In routine operation, users only need to regularly check the oil level and sealing condition to prevent insulating oil leakage, clean radiator surface dust to ensure unobstructed heat dissipation, and monitor three-phase voltage and current balance. Avoid long-term overloaded operation to prevent accelerated insulation aging. It is recommended to conduct a comprehensive insulating oil quality test and internal performance inspection every 2 to 3 years. With standardized operation and simple maintenance, the equipment can achieve a 25-year stable service life, greatly reducing long-term project replacement and maintenance costs.