3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer

3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer

1. Product Description

3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer are practical three-phase oil immersed step-up power transformers designed for low-to-medium voltage elevation in industrial power distribution, renewable energy power generation and temporary engineering power supply systems. Covering three mainstream capacity grades of 250kVA, 315kVA and 400kVA, this series of oil filled step-up transformers is engineered to steadily boost standard 400V low-voltage three-phase electricity up to 20kV medium voltage, solving the voltage level mismatch issue that commonly occurs in distributed power grid connection and on-site power transmission projects. Manufactured strictly in accordance with IEC 60076 international power transformer standards and domestic grid manufacturing specifications, these three-phase oil immersed transformers deliver consistent voltage conversion accuracy and reliable operational stability for commercial and industrial electrical systems.

Different from conventional step-down distribution transformers, this 20kV class step-up transformer series adopts optimized three-phase winding layout and low-loss core structure to ensure balanced voltage elevation and minimize power transmission loss during low-to-high voltage conversion. Built with high-purity oxygen-free copper windings and premium grain-oriented silicon steel core materials, each 400V to 20kV step up oil immersed transformer maintains low no-load current and excellent load adaptability during long-duration continuous operation. The fully sealed corrugated oil tank and standard ONAN oil natural air natural cooling system effectively isolate internal insulating components from external dust, moisture and corrosive elements, preventing insulating oil aging and internal insulation degradation. Available in three flexible capacity options, these industrial step-up transformers perfectly match small and medium-scale power boosting demands for solar power stations, construction site power transmission, rural grid upgrading and factory auxiliary power systems, serving as cost-effective and durable medium-voltage power conversion equipment.

2. Main Technical Parameters

The following table lists complete standardized technical parameters of 3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer. All electrical performance indicators, structural specifications and safety parameters comply with industrial energy efficiency standards and grid access requirements, supporting accurate model selection, professional on-site installation and daily operational maintenance:

3. Core Purpose

The core purpose of 3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer is to achieve stable and efficient low-to-medium voltage elevation for three-phase electrical systems, solving the technical problem of converting 400V low-voltage power into 20kV medium-voltage power for long-distance transmission and grid integration. Unlike conventional step-down transformers used for terminal power distribution, this oil immersed step-up transformer focuses on front-end power boosting, enabling low-voltage generated electricity and on-site temporary power to meet medium-voltage grid access and long-distance power delivery standards.

In practical electrical engineering applications, this three-phase step-up oil transformer undertakes key functions including voltage standardization, power transmission loss reduction, grid power quality stabilization and circuit safety isolation. The 250kVA model adapts to small-scale decentralized power boosting demands, the 315kVA model serves as the most widely used standard capacity for medium-sized projects, and the 400kVA high-capacity version meets concentrated medium-load power elevation requirements. By stably boosting 400V voltage to standard 20kV medium voltage, the equipment effectively reduces line current and transmission loss during long-distance power delivery, improves power transmission efficiency, and ensures safe and compliant grid connection for distributed power generation and temporary engineering power systems.

4. Application Scenarios

With flexible multi-capacity matching, stable step-up performance and excellent outdoor environmental adaptability, 3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer covers most small and medium-scale low-to-high voltage conversion scenarios. It is the mainstream preferred equipment for new energy grid connection, rural grid upgrading, engineering temporary power and industrial auxiliary power boosting:

• Distributed New Energy Grid Connection: Widely used for small and medium-sized photovoltaic power stations and decentralized wind power generation systems. It boosts 400V low-voltage power generated by new energy equipment to 20kV medium voltage, realizing standardized grid connection and solving the problem of low-voltage power inability for long-distance grid integration.

• Rural & Remote Grid Upgrading Projects: Ideal for remote rural areas and mountainous power grid renovation. Long-distance low-voltage transmission is prone to severe voltage drop and power loss; this 400V to 20kV step up transformer elevates voltage for long-distance transmission, effectively improving remote regional power supply quality and reducing grid operation loss.

• Construction Site Temporary Power Transmission: Suitable for large field construction, water conservancy projects and road engineering temporary power systems. It boosts on-site 400V generator power to 20kV medium voltage for long-distance power supply to remote construction sections, solving power supply dead zone problems in field engineering.

• Industrial Auxiliary Power Boosting: Applied in factory self-provided power generation and industrial waste heat power generation projects. It converts low-voltage self-generated power into 20kV medium voltage for factory internal medium-voltage power distribution or surplus power grid-connected transmission, improving enterprise power utilization rate.

• Medium and Small Substation Supporting Projects: Used as supporting voltage conversion equipment for township small substations and regional distribution stations, providing stable medium-voltage power sources for local medium-voltage power distribution networks and realizing hierarchical power distribution management.

• Emergency Power Supply System: Matched with emergency generator sets for industrial parks and municipal facilities. It boosts emergency 400V power to 20kV medium voltage for rapid regional power supply recovery during grid power outages, improving emergency power guarantee capability.

5. Product Features

3 Phase 20kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Oil Immersed Transformer adopts upgraded low-loss oil immersed manufacturing technology and professional step-up winding optimization design. Compared with ordinary step-down transformers and dry-type step-up equipment, this three-phase oil filled step-up transformer has prominent advantages in voltage conversion stability, energy-saving performance and environmental adaptability, fully meeting long-term continuous operation requirements of various power boosting scenarios:

• Three-capacity Flexible Matching: Covering 250kVA, 315kVA and 400kVA three mainstream capacities, it can accurately match small, medium and medium-large power boosting demands. Users can select the corresponding model according to actual power generation capacity and transmission load, avoiding capacity waste or insufficient load margin, with extremely high project matching degree.

• Precise 400V to 20kV Step-up Stability: Professional Yd11 step-up winding structure ensures accurate and balanced three-phase voltage elevation, with ultra-low voltage deviation. It maintains stable 20kV output voltage even under fluctuating low-voltage input and unbalanced load conditions, effectively guaranteeing subsequent power transmission and grid-connected power quality.

• Low Loss & High Transmission Efficiency: Adopting high-permeability low-loss silicon steel core and high-conductivity pure copper windings, the transformer minimizes no-load excitation loss and load operating loss during voltage conversion. Low power loss greatly improves long-distance power transmission efficiency and reduces daily operational power consumption costs.

• Excellent Overload & Short-circuit Resistance: Optimized internal winding reinforcement structure enhances short-circuit impact resistance and transient overload tolerance. It can cope with instantaneous power surge and load fluctuation in new energy power generation and temporary power supply scenarios, effectively avoiding equipment tripping and damage.

• Fully Sealed Oil Immersed Anti-aging Structure: Integral welded corrugated oil tank forms a fully sealed maintenance-free structure, which completely isolates internal insulating oil and core windings from external humid air, dust and corrosive substances. It prevents oil deterioration and insulation aging, eliminates common oil leakage faults, and extends service life significantly.

• Strong All-weather Outdoor Adaptability: Adopting heavy-duty anti-corrosion electrostatic spraying process and 20kV high-grade insulation design, the equipment resists high temperature, low temperature, rain erosion and wind sand impact. The mature ONAN natural cooling system ensures stable heat dissipation, supporting 24-hour uninterrupted outdoor operation in complex and harsh environments.

6. FAQ (Frequently Asked Questions)

Q1: How to choose between 250kVA, 315kVA and 400kVA 400V to 20kV oil immersed step-up transformers?

Capacity selection mainly depends on actual continuous load power and future expansion demand. The 250kVA model is suitable for small decentralized photovoltaic projects and light-load temporary power supply scenarios, featuring lower no-load loss and better energy-saving performance under light loads. The 315kVA capacity is the most versatile standard model, perfectly matching most medium-sized new energy grid connection and rural grid upgrading projects with balanced load capacity and cost performance. The 400kVA high-capacity version is recommended for medium-large centralized power generation projects and long-term heavy-load operation scenarios, reserving sufficient overload margin to cope with peak power surges and later load growth.

Q2: What are the advantages of oil immersed step-up transformers over dry-type step-up transformers?

In outdoor power boosting and long-term continuous operation scenarios, oil immersed step-up transformers have obvious practical advantages. First, the ONAN oil natural circulation cooling system provides more uniform and efficient heat dissipation, with stronger continuous full-load operation capability and better overload resistance than dry-type products. Second, the fully sealed oil tank structure has superior moisture-proof, dust-proof and anti-corrosion performance, adapting to harsh outdoor field and rural grid environments where dry-type transformers are prone to damp aging. In addition, oil immersed step-up transformers have lower manufacturing cost, more stable long-term operation and lower failure rate, making them more suitable for large-scale outdoor power boosting and grid engineering applications.

Q3: Can this 20kV three-phase step-up transformer adapt to fluctuating new energy power input?

Yes, this series of 400V to 20kV oil immersed step-up transformers is specially optimized for new energy power generation scenarios with unstable input voltage. The Yd11 three-phase balanced structure can effectively buffer low-voltage input fluctuation caused by light intensity and wind speed changes, stabilize 20kV medium-voltage output, and filter most grid harmonics generated by new energy power conversion. Meanwhile, the excellent overload resistance and short-circuit withstand capability can cope with instantaneous power surge impact during new energy equipment startup and operation, ensuring safe and stable grid-connected operation of distributed power generation systems.