35kV 10.5kV 8000kVA Oil Immersed Distribution Transformers
35kV 10.5kV 8000kVA Oil Immersed Distribution Transformers
1. Product Description
The 35kV 10.5kV 8000kVA Oil Immersed Distribution Transformer is a large-capacity three-phase medium-voltage distribution transformer engineered for commercial power grids and heavy-duty industrial power distribution systems. Manufactured to comply with IEC, ANSI and GB industry standards, this 8000kVA oil-filled transformer features a standard 35kV high-voltage primary input and 10.5kV low-voltage secondary output, serving as core step-down equipment for medium-to-large scale power conversion projects. Adopting advanced low-loss silicon steel core technology and mature oil-immersed cooling structure, the equipment delivers stable continuous operation under full-load and partial overload conditions, making it a mainstream high-capacity power distribution solution for modern grid infrastructure and industrial energy systems.
This heavy-duty oil immersed distribution transformer adopts a fully sealed bell-type tank design and high-purity mineral insulating oil, which provides dual functions of electrical insulation and circulating heat dissipation. The internal winding structure is optimized with disc-type coil arrangement and reinforced insulation components, effectively enhancing short-circuit resistance and reducing operational loss. Available in standard S13, S20 and S22 low-loss series configurations, the transformer greatly minimizes no-load loss and load loss compared with traditional old-model transformers. Designed with a standard Dyn11 vector group, it boasts excellent harmonic suppression and unbalanced load tolerance, perfectly adapting to complex modern power supply environments with nonlinear and fluctuating loads. With a rated impedance of 7.55%, the equipment maintains stable voltage output and reliable grid connection performance in long-term operational scenarios.
2. Core Purpose
The core function of the 8000kVA 35kV to 10.5kV oil immersed distribution transformer is to implement safe, efficient and stable voltage reduction for 35kV medium-voltage transmission lines, converting high-level grid voltage into standard 10.5kV industrial distribution voltage. It bridges the voltage gap between high-voltage power transmission networks and on-site 10kV-class power distribution systems, solving the core problem of voltage matching in large-capacity power supply scenarios. As a key hub device in regional power distribution links, it undertakes centralized power distribution, voltage stabilization and power quality optimization tasks for industrial zones and municipal substations.
Beyond basic voltage conversion, this large-capacity oil-filled power transformer effectively reduces line transmission loss during bulk power distribution, suppresses grid voltage fluctuation caused by peak and valley load changes, and improves the overall power supply qualification rate of regional power grids. Its strong overload capacity allows short-term 150% rated load operation within a safe period, ensuring uninterrupted power supply during equipment startup peak and grid load surge. It also restrains harmonic current interference in the power system, protects subsequent power distribution equipment and electrical loads, and maintains the stability and safety of the entire medium-voltage power supply system.
3. Application Scenarios
3.1 Urban and Rural 35kV Substation Construction
This 35kV 10.5kV 8000kVA oil immersed transformer is widely used in newly built, renovated and expanded 35kV regional substations in urban and rural areas. Municipal power grids bear large-scale centralized power consumption of residential communities, commercial districts and public facilities. The 8000kVA large capacity fully meets the centralized power distribution demand of urban core areas and suburban new districts. The low-loss and stable operation characteristics effectively reduce municipal grid operation energy consumption, while the excellent voltage regulation performance ensures stable power supply for urban residents and commercial loads, solving the problem of insufficient power supply capacity of traditional medium-capacity transformers in urban peak power consumption periods.
3.2 Heavy Industrial Enterprise Total Step-Down Substation
It is the preferred power distribution equipment for heavy-load industries such as metallurgy, chemical industry, mining, building materials and large manufacturing parks. These industrial scenarios feature high single-point power consumption, frequent load fluctuation and high requirements for power supply continuity. The 35kV/10.5kV voltage conversion standard matches the internal power distribution system specifications of large industrial enterprises. The strong short-circuit resistance and overload resistance of the oil immersed distribution transformer can cope with impact loads generated by large mechanical equipment startup and continuous full-load production, providing reliable and stable power guarantee for industrial production lines and supporting long-term uninterrupted industrial operation.
3.3 New Energy Power Generation Collection Station
The equipment is highly applicable to centralized photovoltaic power stations, onshore wind farms and energy storage power station supporting power distribution systems. New energy power generation has obvious intermittency and volatility, with frequent load changes during grid connection. This low-loss oil immersed transformer can adapt to fluctuating new energy power output, stabilize 10.5kV outgoing line voltage, and complete efficient power conversion and grid-connected transmission. Its good harmonic suppression performance can filter out irregular harmonic interference generated by new energy inverter equipment, optimize grid-connected power quality, and effectively improve the safety and stability of new energy grid-connected operation.
3.4 Large-Scale Infrastructure and Industrial Park Projects
It is widely deployed in large logistics parks, comprehensive industrial zones, railway transit supporting facilities and water conservancy and hydropower projects. These public and industrial infrastructure projects have large total power load and high requirements for equipment operational reliability and environmental adaptability. The fully sealed oil-immersed structure adapts to outdoor open-air and semi-harsh operating environments, with low maintenance frequency and long service life. The 8000kVA super-large capacity can meet the simultaneous power demand of multiple sets of large-scale electromechanical equipment, fully meeting the high-standard power supply requirements of key engineering projects.
4. Product Features
4.1 Large Rated Capacity, Strong Load Adaptability
As a high-capacity medium-voltage power conversion device, this 8000kVA oil immersed distribution transformer breaks through the load limit of conventional medium-capacity transformers, and is specially designed for large-load centralized power distribution scenarios. It supports long-term stable full-load operation and allows safe short-term overload operation, effectively coping with peak load impact and fluctuating industrial loads. The reasonable impedance design ensures no abnormal voltage drop or overvoltage during load switching, maintaining balanced and stable power output, and perfectly matching the power demand of industrial heavy-load and municipal large-area power supply scenarios.
4.2 Low-Loss Silicon Steel Core, Energy-Saving and Efficient
The transformer core is made of high-permeability grain-oriented cold-rolled silicon steel sheets, with precise stacking and cutting process, which greatly reduces magnetic leakage and iron loss. Compared with traditional transformers, this low-loss oil-filled transformer has significantly lower no-load loss and operating temperature rise, effectively reducing long-term grid operation energy consumption and operation costs. The optimized magnetic circuit structure eliminates local overheating problems, ensures uniform internal operation state, and improves the overall energy utilization rate of power distribution links, achieving excellent energy-saving and emission reduction effects.
4.3 Fully Sealed Oil Immersed Structure, Stable and Durable
Adopting standard ONAN oil natural air natural cooling mode and fully sealed welded bell jar tank body, the internal high-quality insulating oil forms a natural circulating heat dissipation system, which efficiently takes away heat generated by core and winding operation. The fully sealed design completely isolates external moisture, dust and corrosive substances, prevents insulating oil deterioration, emulsification and internal insulation aging, and avoids common faults such as oil leakage. The whole machine has good weather resistance, low operating noise and strong environmental adaptability, and can operate stably outdoors all year round with extremely low daily maintenance workload.
4.4 Optimized Winding and Insulation, High Operational Safety
The internal coil adopts reinforced disc-type winding structure and high-strength composite insulation materials, with high insulation strength and strong lightning impulse resistance. The overall structure has excellent mechanical stability, can resist strong electromagnetic impact during short-circuit faults, and avoid coil deformation and damage. Matched with standard Dyn11 vector group design, it can effectively filter triplen harmonics, reduce grid harmonic pollution, improve zero-sequence fault detection capability, and greatly enhance the safety and stability of power grid and terminal equipment operation.
4.5 Standardized Manufacturing, Easy Installation and Maintenance
This 35kV/10.5kV large-capacity distribution transformer is manufactured in strict accordance with international unified standards, with standardized overall dimensions, wiring interfaces and installation procedures. It adopts integrated factory assembly, which simplifies on-site installation and commissioning procedures and shortens project construction cycle. The modular internal structure facilitates daily inspection, oil quality testing and later maintenance and replacement of accessories. With low failure rate and long service life, it effectively reduces the comprehensive operation and maintenance cost of power distribution projects.
5. Frequently Asked Questions (FAQ)
5.1 What working conditions are suitable for the 8000kVA 35kV oil immersed distribution transformer?
This 35kV 10.5kV 8000kVA oil immersed distribution transformer is mainly applicable to medium and large-scale power supply scenarios requiring 35kV to 10.5kV voltage conversion. It is the ideal equipment for urban and rural 35kV regional substations, heavy industrial enterprise general step-down stations, new energy power generation collection stations and large industrial park power distribution projects. It adapts to 50Hz/60Hz conventional power grids, supports long-term full-load continuous operation and short-term overload operation, and can work stably in outdoor open-air, suburban and industrial conventional environments, but it is not recommended for small scattered light-load scenarios to avoid capacity waste.
5.2 What are the advantages of this 8000kVA transformer compared with 3150kVA/5000kVA medium-capacity models?
Compared with 3150kVA and 5000kVA medium-capacity oil immersed transformers, the 8000kVA high-capacity model has larger power supply margin and stronger load impact resistance. It can cope with higher centralized power consumption and more drastic load fluctuation, and is more suitable for heavy industrial production and urban core power supply scenarios with large peak-valley load difference. In terms of long-term operation, it avoids frequent overload operation of medium-capacity equipment, reduces equipment failure probability, and reserves sufficient capacity margin for subsequent power grid expansion and enterprise equipment upgrading, with higher long-term project compatibility and cost performance.
5.3 Does the oil immersed structure require frequent daily maintenance?
This fully sealed oil immersed distribution transformer does not require frequent daily maintenance. The fully sealed tank structure prevents oil leakage and moisture ingress, and the high-quality insulating oil has stable performance and does not need regular replacement. In daily operation, users only need to regularly check the oil temperature, operating noise and external anti-corrosion state, and conduct regular oil quality testing every few years. Compared with dry-type transformers and traditional open-type oil transformers, it has lower maintenance frequency, simpler operation and lower later maintenance cost, which is very suitable for unattended substation and industrial outdoor operation scenarios.
