3 Phase 10kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Class Oil Immersed Transforme
3 Phase 10kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Class Oil Immersed Transformer
1. Product Description
The 3 Phase 10kv 400v Step Up Transformer Electricity 250kva 315kva 400kva Class Oil Immersed Transformer is a practical medium-grade three-phase power boosting equipment widely used in distributed power generation and industrial power distribution systems. Belonging to the standard 10kV class oil immersed transformer series, this step-up power transformer supports stable voltage conversion from 400V low-voltage three-phase electricity to 10kV medium-voltage grid power, with three mainstream rated capacity options of 250kVA, 315kVA and 400kVA, fully matching medium-scale power boosting and grid connection demands. Manufactured strictly in accordance with IEC 60076 and domestic power industry standards, this oil-filled electrical transformer adopts mature S11 low-loss technical design, featuring stable electromagnetic performance and strong field adaptability for both 50Hz and 60Hz power grid environments.
This three-phase oil immersed step-up transformer is equipped with high-quality grain-oriented cold-rolled silicon steel core and full oxygen-free copper winding, effectively lowering no-load loss and load loss during long-term continuous operation. It adopts classic ONAN oil natural air natural cooling mode and fully sealed welded steel tank structure, with high-purity insulating transformer oil sealed inside to undertake dual functions of internal insulation and circulating heat dissipation. Different from conventional step-down distribution transformers, this 400V to 10kV step-up transformer is professionally optimized for low-to-medium voltage power boosting scenarios, with precise turn ratio calibration and standard Dyn11 vector group design. It delivers balanced three-phase output, low operating noise and minimal partial discharge, and all capacity models including 250kVA, 315kVA and 400kVA adopt unified modular production standards, ensuring consistent installation size and operational stability for on-site engineering deployment.
2. Core Purpose
The core purpose of the 10kV class 3 phase oil immersed step up transformer is to solve the voltage grade mismatch between 400V low-voltage power generation equipment and 10kV medium-voltage power grids, realizing safe, efficient and low-loss power boosting and grid-connected transmission. As a key intermediate power conversion device in medium-capacity power systems, it collects scattered low-voltage electric energy generated by distributed power sources and converts it into standard 10kV grid-compliant power, supporting long-distance power transmission, regional power supplement and decentralized energy recycling. The multi-capacity gradient design covers diverse medium-load working conditions, avoiding capacity waste or insufficient power margin in actual project applications.
In daily power system operation, this 400V to 10kV step-up electrical transformer also undertakes core functions of power quality optimization and grid operation stabilization. It can effectively balance three-phase current output, suppress voltage fluctuation caused by intermittent new energy power generation, and filter low-frequency harmonic interference generated by inverter equipment. By upgrading 400V low voltage to 10kV medium voltage for transmission, it greatly reduces line power loss compared with low-voltage long-distance power supply, improves overall power utilization efficiency, and provides reliable and stable power guarantee for industrial self-power supply, rural power grid upgrading and distributed energy grid connection projects.
3. Application Scenarios
3.1 Medium-Scale Distributed New Energy Grid Connection
This 3 Phase 10kv 400v Step Up Oil Immersed Transformer is the preferred core equipment for medium-capacity distributed photovoltaic power stations, small and medium-sized wind power systems and industrial energy storage power generation projects. Most new energy power generation units output standard 400V three-phase low-voltage electricity, which cannot be directly connected to 10kV municipal medium-voltage power grids. The 250kVA, 315kVA and 400kVA capacity models can accurately match the power output scale of medium-sized new energy projects, steadily boosting low-voltage clean energy to compliant 10kV grid voltage, realizing safe grid-connected power transmission and efficient resource utilization of distributed new energy.
3.2 Industrial Park Self-Power Supply and Peak Power Supplement
It is widely applied in medium-sized manufacturing parks, township processing factories, light industrial production bases and small industrial zones. Many industrial areas face insufficient municipal grid power supply and obvious voltage drop during peak power consumption periods. Enterprises can be equipped with diesel generator sets and distributed power generation equipment, and cooperate with this 10kV class step-up transformer to boost self-generated 400V electricity to 10kV medium voltage for internal regional power distribution and peak power supplement. This effectively relieves public grid load pressure and ensures continuous and stable operation of industrial production equipment and electromechanical systems.
3.3 Urban and Rural Power Grid Renovation and Capacity Expansion
In the upgrading reconstruction and capacity expansion of urban suburban grids and rural power distribution networks, this medium-capacity oil immersed step-up transformer serves as important auxiliary power distribution equipment. Scattered resident power sources and small decentralized power generation equipment in rural and suburban areas can realize centralized collection and step-up transmission through this transformer, converting 400V low-voltage power to 10kV medium voltage for regional power scheduling. It effectively solves the problems of short transmission distance and high line loss of traditional low-voltage power supply, optimizes local power grid structure and improves terminal power supply stability.
3.4 Off-Grid Engineering and Remote Regional Power Supply
The equipment is perfectly suitable for remote field construction sites, rural water conservancy projects, mountainous area scattered settlements and other off-grid power supply scenarios lacking complete 10kV grid coverage. Most off-grid power generation and standby power equipment outputs 400V low-voltage power with large transmission loss. This durable oil immersed step-up transformer can boost low-voltage electric energy to 10kV medium voltage, extend power transmission distance, reduce power consumption loss, and realize stable centralized power supply for remote engineering facilities and scattered residential users.
4. Product Features
4.1 Graded Capacity Matching, Strong Engineering Versatility
This 10kV class 3 phase 400V step up oil immersed transformer provides three practical graded capacity options of 250kva, 315kva and 400kva, covering all mainstream medium-load power boosting and grid connection scenarios. Users can select the corresponding capacity model according to actual power generation power, daily load rate and future capacity expansion plans, realizing precise load matching. All models adopt unified technical parameters, wiring specifications and installation dimensions, with strong compatibility and interchangeability, which greatly facilitates project design, equipment procurement and on-site replacement and maintenance.
4.2 Professional Step-Up Design, Excellent Power Quality
Different from universal step-down transformers, this three-phase electrical step-up transformer is specially optimized for 400V to 10kV voltage boosting working conditions. Through precise coil turn ratio calibration and magnetic circuit optimization design, it achieves accurate and stable 10kV medium-voltage output with extremely low voltage deviation rate. The standard Dyn11 vector group design effectively suppresses three-phase current imbalance and grid harmonic pollution, enhances zero-sequence fault detection capability, and ensures that the grid-connected power quality fully meets national and international 10kV power grid access standards, adapting to fluctuating output characteristics of new energy power generation.
4.3 Low-Loss Copper Core Structure, Energy-Saving and Efficient
Adopting high-performance low-loss silicon steel core and full pure copper winding structure, this oil immersed power transformer significantly reduces no-load loss, load loss and operating temperature rise compared with traditional old-model transformers. The advanced vacuum drying and vacuum oil injection process eliminates internal moisture and air gaps, further improving insulation performance and operational efficiency. Long-term full-load operation can effectively reduce invalid power consumption of power distribution links, greatly lowering daily operation and power consumption costs for users, with outstanding energy-saving and environmental protection benefits.
4.4 Fully Sealed Oil Immersed Structure, Low Maintenance
The whole machine adopts fully sealed welded steel tank body, which completely isolates internal insulating oil from external air, moisture and dust, fundamentally avoiding common faults such as oil oxidation, emulsification and insulation aging of open-type transformers. Equipped with natural oil circulation heat dissipation system, it operates stably without auxiliary cooling equipment, with low operating noise and strong continuous operation capability. The outdoor-grade anti-corrosion and weather-resistant tank coating enables the transformer to adapt to long-term unattended operation in high temperature, humid, windy and rainy harsh environments, realizing long-term maintenance-free operation under conventional working conditions.
4.5 High Safety Stability and Long Service Life
The internal coil adopts reinforced compression structure and multi-layer composite insulation materials, with strong mechanical stability and short-circuit impact resistance, which can effectively resist coil deformation and damage caused by grid sudden short-circuit faults. Matched with perfect overvoltage, overcurrent and short-circuit protection mechanisms, it can quickly isolate faults to protect grid and terminal equipment safety. With rigorous factory testing and standardized production, the transformer has a service life of more than 30 years under normal operating conditions, with low failure rate and high comprehensive cost performance for medium-scale power engineering projects.
5. Frequently Asked Questions (FAQ)
5.1 What is the core application difference between this 10kV step-up transformer and step-down transformer?
The essential difference lies in voltage conversion direction and functional positioning. The 3 Phase 10kv 400v Step Up Transformer is dedicated to boosting 400V low-voltage power generated by generators, photovoltaic and energy storage equipment to 10kV medium voltage for grid connection and long-distance transmission, focusing on power collection and energy delivery. In contrast, 10kV step-down transformers are used to reduce 10kV grid high voltage to 400V low voltage for terminal equipment power consumption, focusing on power distribution. The two types of transformers have different internal winding design and voltage ratio parameters and cannot be used interchangeably in engineering projects.
5.2 How to select the right capacity among 250kva, 315kva and 400kva?
Capacity selection should be based on actual average load, peak load and future expansion demand. The 250kVA model is suitable for small distributed photovoltaic systems and low-power industrial supplementary power supply with stable and small peak-valley load difference. The 315kVA model is the most versatile option, widely applicable to most standard medium-sized new energy power stations and rural power grid renovation projects. The 400kVA high-capacity model is recommended for medium industrial parks and power generation projects with large peak load fluctuation. It is necessary to reserve 10%–20% load margin to avoid long-term full-load operation and extend the transformer’s service life.
5.3 What daily maintenance does this 10kV class oil immersed step-up transformer require?
This fully sealed 10kV Class Oil Immersed Transformer requires almost no complex daily maintenance. The closed welded tank structure prevents external moisture and dust from entering, and the internal high-purity insulating oil maintains stable insulation and heat dissipation performance for a long time. Daily operation only requires regular visual inspection of oil temperature, operating noise and tank anti-corrosion status. Professional insulating oil quality sampling and testing is only needed every 3 to 5 years, and oil replacement is only performed when insulation indicators fail to meet standards. Compared with open-type transformers, it greatly reduces later maintenance workload and operational costs.
