50kva 10kv 400v Three Phase Oil Immersed Transformers

50kva 10kv 400v Three Phase Oil Immersed Transformers

1. Technical Parameters

2. Product Description

50kva 10kv 400v Three Phase Oil Immersed Transformers are compact low-loss medium-voltage distribution transformers widely adopted in global civil and industrial power grid systems. This standard three-phase oil filled transformer is professionally designed for 10kV to 400V voltage step-down conversion, accurately converting medium-voltage overhead line power into usable three-phase low-voltage power that matches industrial equipment, household power consumption and public facility electricity standards.

Manufactured with high-quality cold-rolled grain-oriented silicon steel core and high-purity oxygen-free copper windings, this 50kVA oil immersed distribution transformer effectively minimizes magnetic flux leakage and operating power consumption, fully meeting EU Tier 2 and national first-level energy efficiency requirements. The optimized core stacking and winding structure improves power transmission efficiency while maintaining ultra-low no-load and load losses during long-term continuous operation. Adopting a fully sealed corrugated oil tank structure, the equipment isolates internal insulating oil from external air, preventing oil aging, moisture penetration and dust accumulation, which avoids insulation performance degradation caused by long-term outdoor and indoor operation.

Equipped with a 5-position no-load tap changer, this 10kV three-phase transformer supports ±2×2.5% voltage adjustment under power-off conditions, allowing on-site staff to calibrate output voltage according to regional grid fluctuations and ensure stable 400V three-phase output. All finished 50kVA oil immersed power transformers undergo rigorous factory tests including insulation resistance detection, power frequency withstand voltage test, short-circuit resistance test and temperature rise test. With stable output performance, low operating noise and strong environmental adaptability, this cost-effective medium-voltage power transformation equipment is the mainstream choice for rural grid upgrading, small industrial power distribution and residential community power supply projects worldwide.

3. Core Product Features

3.1 Low Energy Consumption & High Energy Efficiency

This 50kva 10kv 400v three phase oil immersed transformer adopts upgraded low-loss core technology and high-conductivity copper coils, delivering significantly reduced no-load and load losses compared with traditional old-fashioned transformers. It complies with international DOE and EU Tier 2 energy efficiency standards, maintaining low power consumption during long-term standby and full-load operation. For small-scale power distribution scenarios, the excellent energy-saving performance effectively reduces daily grid operation loss and long-term electricity costs for power utilities and end users.

3.2 Stable Three-phase Voltage Output

Designed with standard Dyn11 vector group and 3P4W wiring structure, the equipment ensures balanced three-phase voltage and current output, effectively suppressing grid harmonic interference and eliminating three-phase unbalanced power supply faults. The flexible no-load voltage regulation range adapts to seasonal grid voltage deviation and regional power supply differences, keeping the 400V low-voltage output within the standard safe range and providing stable power support for precision electrical equipment and industrial production lines.

3.3 Reliable Oil Cooling & Continuous Operation Capacity

Adopting mature ONAN natural oil circulation cooling technology, insulating oil circulates freely inside the fully sealed tank to evenly dissipate operating heat without local overheating. The passive cooling system requires no auxiliary fan equipment, featuring low noise and zero additional energy consumption. This oil immersed distribution transformer supports 24-hour uninterrupted continuous operation and bears reasonable short-term overload impact, fully adapting to all-weather stable power supply demands of small industrial sites and residential areas.

3.4 Strong Environmental Adaptability & High Safety

The fully sealed anti-corrosion oil tank structure has excellent waterproof, dust-proof and anti-aging properties, adapting to indoor distribution room placement and outdoor open-air pole-mounted or floor-mounted installation. With Class A high insulation grade and 35kV high withstand voltage level, the transformer has strong lightning impulse resistance and insulation breakdown resistance, effectively resisting grid surge and short-circuit faults. It can operate stably in complex environments with temperatures ranging from -25℃ to +40℃, with extremely low failure rate in harsh climatic conditions.

3.5 Compact Structure & Low Maintenance Cost

The miniaturized integrated design saves installation space and reduces on-site civil engineering and construction costs compared with large-capacity transformers. The fully enclosed oil immersed structure avoids frequent insulating oil replacement and daily routine maintenance. During long-term service, only regular visual inspection and heat dissipation cleaning are required, greatly reducing later operation and maintenance workload and equipment failure probability, realizing long-term unattended stable operation with a 30-year service life.

4. Core Purpose & Application Scenarios

4.1 Core Purpose

The core function of 50kva 10kv 400v Three Phase Oil Immersed Transformers is to realize safe and efficient step-down conversion from 10kV medium-voltage grid power to standard 400V three-phase low-voltage power. As a key terminal power distribution device in medium and low voltage power systems, it undertakes regional small-capacity power distribution, voltage stabilization, power isolation and loss reduction power transmission tasks. It solves the problem of voltage mismatch between 10kV overhead transmission lines and terminal three-phase electrical equipment, ensuring safe, stable and energy-saving power supply for various small-load power consumption scenarios.

4.2 Typical Application Scenarios

Rural Power Grid Renovation & Electrification: Widely used in rural grid upgrading, remote village electrification and township terminal power distribution station construction. The 50kVA small capacity perfectly matches the scattered and small-scale power load of rural residential areas, effectively improving rural power supply quality and solving problems of low voltage and unstable power supply in remote areas.

Small Industrial & Workshop Power Supply: Ideal for small processing factories, rural workshops, agricultural product processing bases and mini industrial parks. It provides stable 400V three-phase power for small mechanical equipment, production lines and workshop auxiliary facilities, meeting daily production power demand of small industrial scenarios.

Public Infrastructure Power Distribution: Suitable for rural schools, village clinics, suburban public service stations and small community service facilities. The stable and safe power conversion performance ensures continuous and reliable power supply for public infrastructure, supporting normal operation of lighting, office and public service equipment.

Temporary Engineering Power Supply: Applied for field construction sites, water conservancy projects, rural road construction and outdoor temporary power distribution points. The compact structure and easy installation features enable rapid on-site deployment, providing stable medium and low voltage power guarantee for temporary engineering operations.

Distributed New Energy Matching: Matches small distributed photovoltaic power generation systems and rural micro wind power projects, completing voltage conversion and grid-connected power distribution for new energy power generation, optimizing local new energy power utilization efficiency.

5. FAQ (Frequently Asked Questions)

5.1 What are the advantages of 10kV 50kVA oil immersed transformer compared with dry-type transformer in rural power distribution?

In outdoor rural and unattended power distribution scenarios, three-phase oil immersed transformers show more practical advantages. The ONAN natural oil cooling system delivers more uniform heat dissipation and stronger continuous overload resistance than dry-type transformers, adapting to long-term outdoor all-weather operation. The fully sealed oil tank has better waterproof, anti-corrosion and anti-aging performance, resisting rain erosion and temperature changes in rural open environments. Meanwhile, this 50kVA oil immersed distribution transformer has lower purchase cost and longer service life under the same capacity, with almost no daily maintenance required, which is more suitable for large-scale popularization in rural grid renovation projects.

5.2 What actual load can a 50kVA three phase 10kV/400V transformer carry in daily operation?

In actual on-site operation, the effective sustainable load of this 50kVA oil immersed transformer is about 40kW, with a reserved 20% safe load margin to avoid long-term overload operation. It can withstand short-term peak load impact within a reasonable range to cope with temporary power consumption surge. This load range fully meets the comprehensive power demand of rural centralized households, small workshops and public facilities. Professional electricians should reasonably distribute terminal loads during installation to avoid long-term full-load or overload operation, which can effectively extend the equipment service life and reduce failure risks.

5.3 How to maintain the 50kva 10kv 400v three phase oil immersed transformer for long-term stable operation?

This fully sealed low-loss oil immersed transformer features low daily maintenance requirements. Daily management only needs regular visual inspection to check for oil tank leakage, shell rust and loose high and low voltage wiring terminals, and keep the surrounding area clean and unobstructed to ensure smooth heat dissipation. It is recommended to test insulating oil dielectric strength and insulation resistance every 3 years, and conduct a comprehensive electrical performance overhaul every 5 years. Avoid long-term overload operation and operation beyond the rated temperature and altitude limit. Standard daily inspection and regular professional testing can ensure 30-year stable service life and safe operation of the equipment.