Dyn11 Yyn0 6300kVA 8000kva 10000kva 35kv 10.5kv Pure Copper Oil Immersed Transformer

Dyn11 Yyn0 6300kVA 8000kva 10000kva 35kv 10.5kv Pure Copper Oil Immersed Transformer

1. Product Introduction

The Dyn11 Yyn0 6300kVA 8000kva 10000kva 35kv 10.5kv Pure Copper Oil Immersed Transformer is a high-capacity, medium-voltage oil-immersed power transformation equipment specially developed for 35kV regional power grids, industrial power supply hubs and large-scale power distribution stations. Manufactured in strict accordance with IEC 60076 international power transformer standards and industrial grid specifications, this pure copper winding power transformer covers three mainstream large capacities of 6300kVA, 8000kVA and 10000kVA, supporting 35kV high voltage to 10.5kV medium voltage step-down conversion, which is widely used in industrial and municipal power transmission and distribution projects.

Available with dual vector group options of Dyn11 and Yyn0, this 35kV/10.5kV oil immersed transformer can flexibly adapt to different grid connection standards and load operation requirements of various countries and regions. Different from conventional aluminum winding transformers, this industrial power transformer adopts 100% pure copper windings, featuring lower internal resistance, smaller operating loss and stronger current carrying capacity. Combined with mature oil immersion cooling and fully sealed insulation technology, the equipment maintains stable output performance under long-term full-load and slight overload operating conditions, effectively solving the power conversion and distribution demands of large industrial bases and regional substation projects.

As a high-performance medium-voltage power distribution transformer, this 6300kVA to 10000kva pure copper oil immersed equipment undergoes strict factory testing including temperature rise test, partial discharge detection and short-circuit impact test. With reliable structural design, ultra-low power consumption and excellent environmental adaptability, it has become a hot-selling core equipment for 35kV grid renovation, industrial power expansion and new energy supporting power transformation projects, winning wide recognition from global power engineering contractors and grid operation units.

2.Technical Parameters

3. Core Product Features

This series of Dyn11 Yyn0 35kv 10.5kv pure copper oil immersed transformers adopts upgraded industrial-grade manufacturing technology and grid-level optimization design. Compared with traditional aluminum winding and low-capacity transformers, it has prominent advantages in power transmission efficiency, operational stability, fault resistance and service life, fully adapting to long-term high-load operation of medium-voltage power grid systems:

3.1 100% Pure Copper Winding for Ultra-low Loss

Different from aluminum winding transformers, this large-capacity oil immersed power transformer adopts high-purity oxygen-free pure copper windings, which features extremely low resistivity and excellent electrical conductivity. It effectively reduces copper loss during full-load operation, avoids heat accumulation caused by excessive internal resistance, and greatly improves power transmission efficiency. The pure copper winding structure is not easy to oxidize and deform during long-term high-load operation, ensuring stable power output and reducing long-term grid operation energy consumption.

3.2 Dual Vector Group Flexible Matching

Equipped with dual vector group configurations of Dyn11 and Yyn0, the equipment can meet different grid connection standards worldwide. The Dyn11 vector group effectively suppresses three-phase unbalanced load and harmonic interference, suitable for industrial heavy-load and precision power supply scenarios; the Yyn0 vector group is more adaptable to conventional municipal power grids and centralized civil power distribution systems. Users can freely select the vector group according to on-site grid conditions to ensure perfect matching with local power system operation rules.

3.3 Efficient Oil Immersed Cooling & Sealed Insulation System

Filled with high-quality anti-aging 25# mineral insulating oil that meets international standards, the 35kV medium voltage transformer forms a natural circulating heat dissipation system. Adopting ONAN/ONAF dual cooling modes, it can quickly dissipate massive heat generated by 6300kVA to 10000kVA large-capacity load operation. The fully sealed vacuum oil injection process isolates internal insulating oil from external air and moisture, preventing oil oxidation, emulsification and insulation aging, maintaining stable high-voltage insulation performance and avoiding insulation breakdown faults.

3.4 Strong Short-circuit Resistance & Operational Stability

The core adopts high-permeability grain-oriented cold-rolled silicon steel sheets with multi-stage lap joint technology, minimizing magnetic flux leakage and iron loss. The winding adopts integral fastening and damping reinforcement design, with high mechanical strength and strong ability to resist instantaneous short-circuit impact and grid load fluctuation. It can maintain stable structural performance under extreme grid fault conditions, without winding displacement or deformation, ensuring continuous and safe operation of the power distribution system.

3.5 Excellent Environmental Adaptability & Weather Resistance

The whole machine adopts thickened steel plate welded oil tank and anti-corrosion high-temperature resistant paint treatment, with outstanding waterproof, dustproof, anti-rust and anti-aging performance. It can operate stably in outdoor substation environments with extreme temperatures, strong wind and rain erosion. The industrial-grade sealed structure avoids external corrosive gas and dust intrusion, adapting to harsh working conditions of industrial parks and field substations all year round.

3.6 Low Maintenance & Ultra-long Service Life

The pure copper winding has strong oxidation resistance and stable performance, with no frequent aging and failure problems. The fully sealed maintenance-free design reduces daily inspection and maintenance workload, and the insulating oil replacement cycle is greatly extended. Under standardized operation and routine simple maintenance, the design service life can reach 30 years, effectively reducing later equipment replacement and grid operation costs for users.

4. Core Product Uses

As the core key equipment of 35kV medium-voltage power grid system, 6300kVA, 8000kVA and 10000kVA pure copper oil immersed transformers undertake multiple core functions of high-efficiency power conversion, voltage stabilization and regional centralized power distribution, supporting stable operation of large-scale power supply systems:

35kV to 10.5kV Medium Voltage Step-down Conversion: The core function is to convert 35kV high-voltage grid electric energy into 10.5kV medium-voltage standard electric energy, realizing safe and efficient voltage grade conversion between high-voltage transmission main grid and regional distribution grid, providing stable power source for secondary power distribution equipment and industrial power consumption units.

Regional Centralized Power Distribution: Relying on large-capacity power bearing performance, the equipment undertakes centralized power distribution tasks of regional 35kV substations, evenly distributes electric energy to industrial clusters, urban power grids and supporting infrastructure, effectively solving the power supply pressure of high-load power consumption areas.

Grid Voltage Stabilization & Power Quality Optimization: Through precise no-load tap adjustment and dual vector group balance design, it calibrates system voltage deviation caused by long-distance line loss and seasonal load changes, stabilizes 10.5kV medium-voltage grid voltage, suppresses three-phase unbalance and harmonic interference, and comprehensively improves regional power supply quality.

New Energy Grid Connection & Power Matching: It is applicable to voltage conversion and grid connection matching for large-scale photovoltaic power stations, wind power bases and energy storage power stations, converting unstable new energy power into standard grid power, improving new energy consumption capacity and grid connection stability.

Power Grid Fault Isolation & Safety Protection: It effectively isolates 35kV high-voltage main grid and 10.5kV regional distribution grid, prevents high-voltage side fault impact from spreading to terminal power consumption equipment, reduces grid fault scope and equipment damage rate, and improves the overall anti-risk capability of power transmission and distribution system.

5. Wide Application Scenarios

With large capacity, pure copper high-efficiency performance, dual vector group options and strong environmental adaptability, this 35kV/10.5kV oil immersed power transformer is widely used in various large-scale power grid engineering, industrial energy supply and new energy projects:

5.1 Regional 35kV Substation Projects

This series of transformers is the preferred main transformer for newly built and upgraded 35kV core substations in prefecture-level cities, counties and industrial parks. The 6300kVA model is suitable for conventional regional power supply, while 8000kVA and 10000kVA models meet the power demand of high-load and rapidly developing regional power grids, supporting daily power supply and peak load guarantee.

5.2 Large Industrial Park & Heavy Industry Base

Widely applied in supporting power supply of chemical industry, metallurgy, mining, new material manufacturing and other heavy industrial bases, as well as large-scale industrial parks. The pure copper winding large-capacity design fully meets the long-term high-load continuous power demand of industrial production, ensuring stable and uninterrupted industrial power supply.

5.3 New Energy Power Generation Base Grid Connection

Suitable for power transformation and grid connection supporting projects of centralized photovoltaic bases, large wind power farms and comprehensive energy storage stations. The stable voltage conversion performance and strong anti-interference ability can effectively adapt to the fluctuating output characteristics of new energy power, ensuring safe grid connection and stable power transmission.

5.4 Urban Power Grid Capacity Expansion & Renovation

Applied to old urban power grid upgrading and capacity expansion projects, solving the problems of insufficient power supply capacity, high operation loss and backward voltage regulation performance of old equipment. It effectively improves urban power grid carrying capacity and power supply reliability, meeting the growing commercial and residential power consumption demand of cities.

5.5 Key National Infrastructure Projects

It provides stable and reliable power guarantee for large-scale water conservancy projects, railway transit hubs, regional energy transmission channels and data center supporting power projects, ensuring the safe and continuous operation of national key infrastructure facilities.

6. Frequently Asked Questions (FAQ)

Q1: What is the difference between Dyn11 and Yyn0 vector groups in this 35kV/10.5kV oil immersed transformer?

Both vector group configurations meet international power grid standards but apply to different scenarios. The Dyn11 vector group features strong ability to suppress three-phase unbalanced load and harmonic current, with low zero-sequence impedance, which is more suitable for industrial heavy-load power supply, new energy grid connection and scenarios with high requirements for power supply quality. The Yyn0 vector group has simple structure and stable voltage output, perfectly adapting to conventional municipal power grids, residential centralized power supply and general commercial power distribution scenarios. Users can choose the appropriate vector group according to the imbalance degree and load type of on-site grid load.

Q2: Why choose pure copper winding instead of aluminum winding for 6300kVA-10000kVA large capacity transformers?

Large-capacity 35kV medium voltage transformers operate under long-term high-load conditions, which puts forward high requirements for winding conductivity and stability. Pure copper windings have lower resistivity, higher conductivity and better heat dissipation performance than aluminum windings, effectively reducing operating loss and temperature rise. Meanwhile, pure copper materials have stronger oxidation resistance and structural stability, not easy to deform and age under long-term full-load operation, with lower failure rate and longer service life. Although the procurement cost is slightly higher, the energy-saving benefit and stable operation performance in the whole life cycle can greatly reduce long-term operation costs, which is the most cost-effective choice for large grid and industrial projects.

Q3: How to select 6300kVA, 8000kVA or 10000kVA capacity for practical engineering projects?

Capacity selection needs to comprehensively consider the project’s current peak load and future 5-10 years load growth plan. The 6300kVA pure copper oil immersed transformer is suitable for conventional county-level substations, small and medium-sized industrial parks and general new energy power generation projects with stable load. The 8000kVA model is applicable for regional industrial clusters and urban suburban power grid expansion projects with medium and high power consumption. The 10000kVA large-capacity transformer is designed for ultra-large industrial bases, core urban substations and large-scale new energy centralized grid connection projects with large power consumption and rapid load growth. All three capacities adopt unified pure copper winding process and sealing standards, with consistent safety and environmental adaptability.