630kva 10kv 400v Oil Immersed Transformer Electrical Transformers

630kva 10kv 400v Oil Immersed Transformer Electrical Transformers

1. Product Overview

The 630kva 10kv 400v Oil Immersed Transformer Electrical Transformers are widely trusted medium-capacity three-phase distribution transformers, specially engineered for 10kV medium-voltage power grid systems and industrial power distribution networks. Manufactured in strict accordance with IEC 60076 international power transformer standards and GB/T 6451 industry specifications, this 10kV to 400V step down oil immersed transformer serves as core electrical equipment for voltage conversion and centralized power distribution in medium-load power consumption scenarios.

Designed with a standard 10kV high voltage input and 400V low voltage output configuration, this industrial oil immersed electrical transformer efficiently steps down medium grid voltage into usable three-phase low voltage power for civil construction, industrial production and municipal infrastructure. Adopting premium mineral insulating oil cooling technology and fully sealed corrugated tank structure, the 630kVA oil immersed distribution transformer delivers superior heat dissipation, stable continuous load operation and excellent outdoor weather resistance, far exceeding the performance of conventional dry-type electrical transformers in open-air substation environments.

Every finished 630kva 10kv 400v oil immersed transformer undergoes rigorous factory testing including partial discharge detection, temperature rise verification, short-circuit impact resistance test and full-load aging inspection. Featuring low operational loss, balanced three-phase output and long service life, this energy-saving oil immersed power transformer has become one of the most popular electrical transformers for urban grid upgrading, industrial park power expansion and rural large-scale power renovation projects across global markets.

2.Technical Parameters

3. Core Product Features

This 630kva 10kv 400v oil immersed electrical transformer adopts upgraded energy-saving manufacturing technology and industrial-grade structural optimization, balancing high efficiency, operational stability and environmental adaptability. It solves the pain points of high loss, poor weather resistance and unstable output of traditional old-generation electrical transformers, suitable for long-term full-load operation of medium-capacity power distribution systems:

3.1 High Energy-saving & Low Loss Performance

The core of this 10kV oil immersed transformer adopts high-permeability grain-oriented cold-rolled silicon steel sheets with full oblique lap joint process, which effectively suppresses magnetic flux leakage and reduces no-load iron loss significantly. The dense and uniform pure copper winding structure minimizes internal resistance and load loss during long-term full-load operation. Compared with conventional distribution transformers, this energy-saving oil immersed transformer greatly reduces daily power consumption and grid line loss, bringing long-term energy-saving benefits for power grid operation and industrial power supply.

3.2 Reliable Oil Immersed Cooling & Insulation System

Filled with anti-aging non-PCB environmental-friendly mineral insulating oil (FR3 ester oil optional), the 630kVA step down transformer forms a natural ONAN circulating heat dissipation system. Without auxiliary cooling equipment, it can quickly dissipate heat generated by medium-load operation, ensuring stable internal temperature during 24-hour uninterrupted work. The fully sealed vacuum oil injection structure isolates internal insulating oil from external air and moisture, preventing oil emulsification, oxidation and insulation aging, maintaining excellent dielectric performance in complex outdoor environments.

3.3 Stable Voltage Output & Strong Anti-interference Ability

Equipped with precision off-load voltage tapping adjustment function, this three-phase electrical transformer can calibrate 10kV input voltage deviation within ±5% range to ensure constant 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 industrial mechanical equipment and municipal power loads. It can resist instantaneous grid voltage surge and avoid power supply instability caused by unbalanced three-phase load.

3.4 Excellent Weather Resistance & Durable Structure

The whole machine adopts thickened steel plate welding and anti-corrosion electrostatic spray treatment, with outstanding waterproof, dustproof, rust-proof and anti-aging performance. This 10kV/400V oil immersed transformer can operate stably in outdoor open-air substations, humid industrial zones, high-temperature field environments and suburban power distribution stations all year round. The reinforced internal winding and core structure has strong vibration resistance and short-circuit impact resistance, effectively reducing equipment failure rate and improving operational safety.

3.5 Low Maintenance & High Cost Performance

Designed with a simple and reliable mechanical structure, this medium-capacity oil immersed power transformer has almost no vulnerable parts. The fully sealed maintenance-free design extends the replacement cycle of insulating oil, greatly reducing daily inspection workload and later operation and maintenance costs. Compared with dry-type electrical transformers with the same capacity, it has lower procurement cost, stronger overload resistance and wider application scenarios, achieving ultra-high cost performance for medium-scale power distribution projects.

3.6 Safe & Low-noise Environmental Protection Operation

Optimized core vibration reduction and winding fixing technology effectively weaken operating vibration and noise, fully meeting urban and industrial environmental protection noise standards. Equipped with standard oil level gauge, temperature detector and pressure relief valve, the transformer can monitor real-time operating status. The automatic pressure relief device can release internal pressure timely under overload, overheating or short-circuit faults, avoiding equipment damage and ensuring safe and stable operation of the entire power distribution system.

4. Core Product Uses

As essential medium-capacity power transformation equipment for 10kV power grid systems, the 630kva 10kv 400v Oil Immersed Transformer Electrical Transformers undertake multiple core functions of voltage conversion, centralized power distribution and power quality optimization, ensuring safe and efficient operation of medium-load power consumption systems:

10kV to 400V Medium-Low Voltage Step-down Conversion: The core function is to convert 10kV medium-voltage grid transmission power into standard 400V three-phase low-voltage power, realizing safe and accurate voltage matching between high-voltage overhead lines and terminal industrial and civil electrical equipment, which is the basic guarantee for medium-scale power supply scenarios.

Centralized Regional Power Distribution: This oil immersed electrical transformer undertakes centralized power distribution tasks for industrial zones, urban community clusters and township core power grids, reasonably distributing grid power according to actual peak load demand, balancing three-phase load current and reducing power transmission line voltage drop and power loss.

Power Supply Quality Stabilization & Optimization: By adjusting off-load tap positions, the equipment calibrates system voltage deviation caused by long-distance transmission loss, seasonal load changes and grid fluctuation, stabilizes terminal 400V voltage within standard range, suppresses grid harmonics and three-phase unbalance, and comprehensively improves regional power supply quality and stability.

Power Grid Fault Isolation & Safety Protection: It effectively isolates the upper 10kV medium-voltage main grid and lower 400V low-voltage load system, preventing high-voltage fault surges from spreading to the user side, limiting grid fault scope and reducing terminal electrical equipment damage risks.

Long-term Full-load Continuous Power Guarantee: Relying on excellent heat dissipation performance and short-term overload resistance, the 630kVA oil immersed transformer supports 24-hour uninterrupted full-load operation, meeting stable power demand for medium-scale industrial production and municipal public infrastructure.

5. Wide Application Scenarios

With stable performance, moderate load capacity, strong environmental adaptability and high cost performance, the 630kva 10kv 400v Oil Immersed Transformer Electrical Transformers are widely applied in municipal power grids, industrial power supply, infrastructure construction and new energy supporting projects worldwide:

5.1 Urban & Township Power Grid Renovation

This 630kVA 10kV/400V oil immersed transformer is the mainstream core equipment for urban suburban grid upgrading, township centralized power supply and old community power grid renovation. It effectively solves the problems of insufficient power supply capacity, unstable voltage and high operation loss of old power grids, improving regional power grid carrying capacity and power supply reliability.

5.2 Medium-sized Industrial Park Power Supply

Widely used in medium-sized industrial parks, mechanical processing bases, food manufacturing factories, textile factories and light industrial production zones. The 630kVA medium load capacity fully meets the long-term continuous power demand of medium-scale production lines and auxiliary electrical equipment, ensuring stable and uninterrupted industrial production power supply.

5.3 Municipal & Large Public Facilities

Suitable for power distribution of urban large community clusters, comprehensive schools, general hospitals, scenic area supporting facilities and township public service centers. Its low-noise, energy-saving and stable operation will not affect public living and working environments, fully meeting municipal public infrastructure power supply standards.

5.4 Distributed New Energy Supporting Projects

Applicable for supporting power transformation and grid connection of distributed photovoltaic power stations, small wind power generation systems and rural comprehensive new energy power supply projects. The stable voltage conversion performance effectively balances new energy power fluctuation and ensures smooth grid connection and safe power transmission.

5.5 Key Engineering & Long-term Temporary Power Projects

With strong outdoor weather resistance, dustproof and moisture-proof performance, this oil immersed electrical transformer is commonly used for long-term fixed power guarantee of large construction sites, road traffic engineering, water conservancy projects and municipal key engineering projects, providing reliable stable power support for field operation.

6. Frequently Asked Questions (FAQ)

Q1: Why choose 630kVA 10kV/400V oil immersed transformer for industrial and municipal power distribution?

The 630kVA capacity is the most balanced medium capacity for most urban and industrial power distribution scenarios, avoiding insufficient load of small-capacity transformers and excessive energy waste of large-capacity models. As a mature 10kV grade oil immersed electrical transformer, it adopts professional oil circulation cooling technology, with better heat dissipation and overload resistance than dry-type transformers, adapting to long-term outdoor full-load operation. Meanwhile, the standard 10kV to 400V voltage ratio matches most global power grid standards, featuring strong versatility, low failure rate and lower long-term operation cost, which is the preferred solution for medium-scale grid renovation and industrial power supply projects.

Q2: What is the difference between Dyn11 and Yyn0 vector groups for this 630kVA oil immersed transformer?

The two vector groups are configured for different grid operation requirements. The Dyn11 vector group has low zero-sequence impedance and excellent ability to suppress three-phase unbalanced load and harmonic interference, making it more suitable for industrial park power supply, new energy grid connection and scenarios with high power supply quality requirements. The Yyn0 vector group features simple structure and stable voltage output, which is more applicable to conventional municipal power grids, residential cluster power supply and general public facility power distribution. We can freely configure the vector group according to customers’ on-site grid conditions and load types.

Q3: What daily maintenance does the 630kva 10kv 400v oil immersed electrical transformer require?

This fully sealed oil immersed transformer belongs to low-maintenance industrial electrical equipment. In daily operation, users only need to regularly check the oil tank sealing condition to prevent insulating oil leakage, clean radiator surface dust to ensure unobstructed heat dissipation, and monitor three-phase voltage and current balance. Long-term overloaded operation should be avoided 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 simple maintenance, the equipment can achieve a 25-year stable service life, greatly reducing project operation and replacement costs.