200kva 10kv 400v Oil Immersed Transformer Electrical Transformers

200kva 10kv 400v Oil Immersed Transformer Electrical Transformers

1. Product Overview

The 200kva 10kv 400v Oil Immersed Transformer Electrical Transformers are widely trusted mid-small capacity three-phase distribution transformers, specially designed for 10kV medium voltage power grid systems and general industrial and civil power distribution projects. Manufactured strictly in accordance with IEC 60076 international standards and GB/T 6451 industry specifications, this 10kV to 400V step down oil immersed transformer serves as core voltage conversion equipment for residential areas, small factories and municipal power distribution networks.

Featuring a standard 10kV high voltage input and 400V low voltage output configuration, this industrial oil immersed electrical transformer efficiently converts medium-voltage overhead line power into usable three-phase low-voltage electricity for daily civilian consumption and light industrial equipment operation. Adopting mature S11 series low-loss electromagnetic design and fully sealed oil immersion cooling structure, the 200kVA oil immersed distribution transformer delivers stable performance, low power loss and excellent outdoor weather resistance. Compared with dry-type electrical transformers, this oil type power transformer offers better heat dissipation under continuous load, lower operating costs and longer service life, making it one of the most cost-effective power transformation solutions for grassroots power grid construction and renovation.

Every finished 200kva 10kv 400v oil immersed transformer undergoes rigorous factory testing including partial discharge inspection, temperature rise testing, short-circuit impact resistance and full-load aging verification. With standardized production process, balanced three-phase output and minimal maintenance requirements, this energy-saving oil immersed power transformer remains a top-selling electrical device for urban and rural grid upgrading, light industrial power supply and decentralized regional power distribution projects across global markets.

2. Technical Parameters

3. Core Product Features

This 200kva 10kv 400v oil immersed electrical transformer adopts upgraded S11 low-loss electromagnetic design and fully sealed industrial structure, effectively solving high energy consumption and unstable voltage issues of traditional old-model transformers. It delivers reliable continuous operation and outstanding cost performance for mid-small load power distribution systems:

3.1 Low No-load & Load Loss Energy-saving Design

The transformer core adopts high-permeability grain-oriented cold-rolled silicon steel sheets with full oblique lap joint technology, which greatly suppresses magnetic flux leakage and minimizes standby no-load loss. The compact pure copper winding structure reduces internal resistance significantly, cutting down load loss during continuous operation. As an energy-saving oil immersed distribution transformer, it effectively reduces daily grid power consumption and long-term operational expenditure for power grid stations and end users.

3.2 Reliable ONAN Oil Immersed Cooling System

Filled with non-PCB environmental-friendly anti-aging mineral insulating oil, the 200kVA step-down transformer adopts standard ONAN natural air cooling technology. The internal insulating oil forms automatic circulating heat dissipation, ensuring uniform temperature control during 24-hour uninterrupted operation. The fully sealed corrugated oil tank structure isolates internal oil from external air and moisture, preventing oil oxidation, emulsification and insulation aging, maintaining stable dielectric performance in humid, dusty and open-air outdoor environments.

3.3 Precise Voltage Regulation & Strong Anti-harmonic Performance

Equipped with ±2×2.5% off-load tapping adjustment function, this three-phase electrical transformer accurately calibrates 10kV input voltage deviation caused by long-distance transmission and seasonal load fluctuation, ensuring stable 400V low-voltage output. The optional Dyn11 vector group effectively balances three-phase current, suppresses grid harmonics and unbalanced load impact, while Yyn0 configuration suits conventional balanced grid scenarios. It greatly improves power supply quality and avoids equipment damage caused by voltage surge.

3.4 Excellent Outdoor Adaptability & Structural Stability

The whole machine adopts thickened steel plate welding and multi-layer anti-corrosion spray treatment, featuring excellent waterproof, rust-proof and dust-proof performance. This 10kV/400V oil immersed transformer can operate stably in outdoor pole-mounted installation, suburban distribution stations and rural open-air environments all year round. Reinforced internal core and winding structure enhances vibration resistance and short-circuit impact resistance, lowering daily failure rate and improving overall operational safety.

3.5 Low Maintenance & High Comprehensive Cost Performance

Designed with simple and robust mechanical structure, this mid-small capacity oil immersed power transformer has no vulnerable parts and requires minimal routine maintenance. The fully sealed maintenance-free design extends insulating oil replacement cycles, greatly reducing on-site inspection and after-sales maintenance costs. Compared with equivalent dry-type electrical transformers, it features lower upfront investment, stronger overload tolerance and wider application flexibility, ideal for mass grassroots power distribution projects.

3.6 Low-noise & Environmentally Friendly Operation

Optimized core lamination and winding fixing technology effectively reduce operating vibration and running noise, fully meeting urban and rural environmental protection standards. Equipped with oil level gauge, temperature indicator and automatic pressure relief valve, the transformer supports real-time operating status monitoring. In case of overload or overheating faults, the pressure relief device releases internal pressure timely to protect equipment and ensure safe grid operation.

4. Core Product Uses

As essential mid-small capacity power transformation equipment for 10kV power distribution networks, the 200kva 10kv 400v Oil Immersed Transformer Electrical Transformers undertake core functions of voltage step-down, decentralized power distribution and power quality stabilization, ensuring safe and efficient power supply for civil and light industrial loads:

10kV to 400V Standard Voltage Step-down Conversion: The primary function is to convert 10kV medium-voltage grid power into standard 400V three-phase low-voltage power, realizing safe voltage matching between high-voltage transmission lines and terminal civilian and industrial electrical equipment.

Decentralized Regional Power Distribution: This oil immersed electrical transformer is widely used for regional decentralized power distribution in townships, suburban communities and industrial clusters, reasonably distributing grid power according to actual load demand and reducing line voltage drop and power loss.

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

Grid Fault Isolation & Safety Protection: It isolates the upper 10kV medium-voltage main grid and lower 400V low-voltage load system, preventing high-voltage fault surges from spreading to user terminals and limiting fault coverage of the power distribution network.

Long-term Continuous Power Supply Guarantee: Relying on reliable heat dissipation and steady load resistance, the 200kVA oil immersed transformer supports 24-hour uninterrupted operation, meeting stable power demand for residential daily consumption and light industrial continuous production.

5. Wide Application Scenarios

With stable performance, moderate load capacity, strong environmental adaptability and high cost performance, the 200kva 10kv 400v Oil Immersed Transformer Electrical Transformers cover most mainstream mid-small load power supply scenarios, widely applied in municipal grid renovation, light industrial power supply and public infrastructure projects:

5.1 Urban & Rural Power Grid Renovation

This 200kVA 10kV/400V oil immersed transformer is the mainstream equipment for rural power grid upgrading, township centralized power supply and suburban community grid reconstruction. It effectively solves insufficient power capacity and unstable voltage problems of old power grids, improving regional power supply reliability and grid carrying capacity.

5.2 Light Industrial & Small Factory Power Supply

Suitable for small manufacturing workshops, food processing plants, textile factories, woodworking workshops and other light industrial scenarios. The 200kVA load capacity perfectly matches daily continuous power consumption of small production lines and mechanical auxiliary equipment, ensuring stable industrial power supply.

5.3 Municipal & Public Facility Power Distribution

Widely used for power supply of community service centers, township hospitals, primary and secondary schools, rural water pump stations, street lighting systems and scenic area supporting facilities. Its low-noise and stable operation will not affect public living and working environments.

5.4 Distributed New Energy Supporting Projects

Applicable for voltage conversion and grid connection of small distributed photovoltaic power stations and rural new energy power generation systems. It stabilizes fluctuating new energy output and ensures smooth and safe grid connection for decentralized green power projects.

5.5 Medium-term Temporary Engineering Power

With compact structure, convenient installation and excellent outdoor weather resistance, this oil immersed electrical transformer is commonly used for medium-term fixed power guarantee of municipal construction sites, road renovation projects and rural infrastructure construction.

6. Frequently Asked Questions (FAQ)

Q1: Why choose 200kVA 10kV/400V oil immersed transformer for most civilian and light industrial projects?

The 200kVA capacity is the most balanced mid-small capacity for mainstream grassroots power distribution scenarios, avoiding capacity waste of large transformers and insufficient load capacity of small models. As a standard 10kV grade S11 low-loss oil immersed electrical transformer, it features lower no-load and load loss than traditional transformers, bringing obvious energy-saving effects for long-term operation. Its outdoor waterproof and dustproof performance is more suitable for pole-mounted and open-air substation installation compared with dry-type transformers, with lower overall project cost and simpler daily maintenance, making it the preferred choice for urban and rural grid upgrading and light industrial power supply.

Q2: What is the practical difference between Dyn11 and Yyn0 vector groups for this 200kVA transformer?

Dyn11 and Yyn0 are two common connection groups for three-phase distribution transformers, adapting to different load conditions. The Dyn11 vector group has low zero-sequence impedance and strong ability to suppress three-phase unbalanced load and harmonic interference, making it more suitable for light industrial workshops and new energy grid connection with complex load types. The Yyn0 vector group delivers ultra-stable voltage output with simple structure, which is more applicable to conventional residential communities and municipal public facilities with balanced load. We can configure the vector group freely according to customers’ on-site grid conditions.

Q3: What daily maintenance is required for the 200kva 10kv 400v oil immersed electrical transformer?

This fully sealed oil immersed transformer is designed for low daily maintenance. On-site staff only need to conduct regular visual inspections, check oil tank sealing to prevent insulating oil leakage, and clean radiator dust to guarantee smooth heat dissipation. Long-term overloaded operation should be avoided to prevent accelerated insulation aging. Professional comprehensive detection of insulating oil quality and internal operating status is recommended every 2 to 3 years. With standardized simple maintenance, the equipment can reach a 25-year design service life and maintain stable long-term operation.