5MVA Electric Power Transformer 30kv 33kv Voltage Copper Winding Dyn11 Oil Immersed Transformer
1. Product Overview
The 5MVA Electric Power Transformer 30kv 33kv Voltage Copper Winding Dyn11 Oil Immersed Transformer is a high-capacity, industrial-grade three-phase power conversion device designed for medium-voltage power grid systems and heavy-load industrial power distribution projects. Engineered with a rated capacity of 5MVA and compatible with mainstream 30kV and 33kV high input voltage grades, this oil immersed power transformer adopts pure copper winding configuration and standard Dyn11 vector group connection, fully complying with IEC 60076 international power equipment standards and industrial power supply specifications. As a core step-down and voltage stabilization device for medium-voltage power transmission and distribution systems, it efficiently converts 30kV/33kV high-voltage grid electricity into stable low-voltage power for industrial production, municipal power supply, and new energy grid connection scenarios.
This heavy-duty copper winding oil immersed transformer features a fully sealed oil cooling structure, excellent harmonic suppression performance, and strong unbalanced load resistance, solving common pain points such as grid voltage fluctuation, harmonic interference, and unstable load operation in medium and large power distribution systems. Compared with aluminum winding transformers, the pure copper winding design greatly improves electrical conductivity, load capacity and service life, while the professional Dyn11 connection mode optimizes three-phase power balance, making it the preferred high-efficiency power transformer for industrial parks, regional substations, and large-scale engineering power supply projects.
2. Core Product Features
2.1 Premium Pure Copper Winding Configuration
This 5MVA 30kV/33kV oil immersed power transformer adopts 100% high-purity oxygen-free copper windings, which delivers far better electrical conductivity, current-carrying capacity and thermal stability than traditional aluminum windings. The dense and precise winding structure reduces internal resistance, effectively lowering load loss and no-load loss during long-term full-load and overload operation. The copper winding also features strong oxidation resistance and fatigue resistance, avoiding winding aging, overheating and power attenuation under long-term heavy-load operation, ensuring stable power output and greatly extending the overall service life of the electric power transformer.
2.2 Standard Dyn11 Vector Group Connection
Equipped with a standard Dyn11 connection group, this medium voltage oil immersed transformer adopts delta connection on the high-voltage side and star connection with neutral wire on the low-voltage side, forming a 30° phase shift relationship. This classic structural design effectively suppresses third-harmonic currents in the power grid, reduces harmonic interference, and significantly improves power supply quality. Meanwhile, the Dyn11 connection mode has excellent unbalanced load regulation capability, which can stably operate under asymmetric three-phase loads and avoid neutral point voltage drift, perfectly adapting to complex power supply environments with mixed single-phase and three-phase loads.
2.3 Dual 30kV/33kV Voltage Adaptability
Designed with dual high-voltage input specifications of 30kV and 33kV, this 5MVA medium-capacity power transformer is compatible with most mainstream medium-voltage power grid standards in industrial and municipal fields. It supports flexible voltage matching and step-down conversion, adapting to different regional grid voltage parameters and engineering power supply requirements. The built-in precise voltage regulation structure ensures accurate output voltage with ultra-low deviation, effectively solving the problems of long-distance transmission voltage drop and grid voltage fluctuation, realizing real-time voltage stabilization and ensuring safe and standardized power consumption of terminal equipment.
2.4 High-Efficiency Oil Immersed Heat Dissipation Structure
Adopting a fully sealed oil immersed cooling system and high-quality insulating mineral oil, this industrial power transformer realizes efficient circulating heat dissipation during continuous operation. The high-performance cold-rolled grain-oriented silicon steel core minimizes magnetic leakage and no-load loss, reducing equipment heat generation and operating noise. The integrally welded corrugated oil tank has good pressure resistance, corrosion resistance and sealing performance, which isolates internal components from external moisture, dust and corrosive gases, preventing insulating oil aging and internal insulation degradation, and adapting to long-term outdoor and indoor heavy-load operation.
2.5 High Safety and Strong Operational Stability
This copper winding Dyn11 oil immersed transformer is equipped with multiple safety protection mechanisms including over-current protection, short-circuit protection, over-temperature protection and pressure relief protection. It can quickly respond to abnormal grid conditions such as sudden load surge and short-circuit faults to cut off risks and protect terminal power equipment and grid operation safety. The overall structure is firm and shock-resistant, with strong short-circuit withstand capability and anti-overload performance, capable of stably coping with peak load operation and complex grid fluctuations, ensuring continuous and uninterrupted power supply for key projects.
3. Core Uses
The 5MVA Dyn11 Oil Immersed Transformer with Copper Winding for 30kV/33kV Voltage is a key medium-voltage power conversion and distribution device in large-scale power systems, mainly used for step-down voltage conversion, grid voltage stabilization, power quality optimization and safe power distribution. Its core function is to convert 30kV and 33kV medium-high voltage electric energy from power transmission grids into standard industrial and municipal low-voltage power, realizing voltage matching between power grids and terminal heavy-load equipment.
In power system operation, this 5MVA electric power transformer relies on Dyn11 connection characteristics to suppress grid harmonics, balance three-phase load voltage, reduce power transmission loss, and improve the stability and reliability of medium-voltage power distribution systems. It can bear long-term heavy-load power supply tasks, solve the problem of insufficient power supply capacity of small-capacity transformers in large industrial scenarios, and support stable operation of high-power mechanical equipment, automated production lines and municipal power facilities. In addition, it can also be used for new energy power generation voltage matching and grid-connected power regulation, improving new energy power utilization efficiency and grid-connected safety.
4. Main Application Scenarios
4.1 Industrial Park Power Distribution System
This 5MVA 30kV/33kV copper winding oil immersed transformer is widely used in comprehensive industrial parks, chemical industrial zones, manufacturing bases and mining industrial areas. These scenarios have concentrated heavy-load power consumption and mixed three-phase and single-phase loads. The strong unbalanced load resistance and high load capacity of the Dyn11 transformer can fully meet the long-term stable power demand of high-power industrial equipment, automated production lines and motor systems, ensuring continuous industrial production operation.
4.2 Municipal Substation & Urban Power Grid Project
It serves as core distribution equipment for urban regional substations, urban power grid upgrading and capacity expansion projects. The 30kV/33kV dual voltage adaptation matches urban medium-voltage grid standards, and the high-efficiency power conversion performance effectively optimizes urban power grid structure, improves terminal power supply quality, and solves the problems of insufficient power supply capacity and voltage instability in urban peak power consumption periods. It is suitable for centralized power supply of urban commercial zones, residential clusters and public facility systems.
4.3 New Energy Power Generation Grid Connection
Widely applied in large-scale photovoltaic power stations, wind farm power collection systems and energy storage power station supporting projects. The Dyn11 oil immersed transformer can effectively filter new energy power generation harmonics, stabilize output voltage, and convert generated electric energy into grid-compliant voltage standards for safe grid-connected transmission. Its low-loss operation characteristic reduces new energy power transmission loss and improves the overall power generation and grid-connected efficiency of new energy projects.
4.4 Large-Scale Engineering & Infrastructure Power Supply
Applicable for long-term power guarantee of large infrastructure projects such as railway transit, airport supporting facilities, port terminals and water conservancy projects. These key projects require high power supply stability and continuity. The 5MVA high-capacity copper winding transformer can provide stable heavy-load power support, adapt to complex engineering power consumption environments, and ensure the normal operation of engineering mechanical equipment and supporting power systems.
4.5 Rural & Regional Power Grid Reconstruction
Used for capacity expansion and upgrading of rural medium-voltage power grids and remote regional power supply projects. The 30kV/33kV medium-voltage grid matching capability solves the problem of insufficient power supply capacity of rural old grids. The excellent voltage stabilization and anti-interference performance improves the power supply level of rural industrial and civilian electricity, meeting the power demand of rural industrial processing and modern residential high-power electrical equipment.
5. FAQ (Frequently Asked Questions)
5.1 What are the unique advantages of Dyn11 vector group for 5MVA 30kV/33kV power transformers?
The Dyn11 connection group is the optimal configuration for medium-voltage distribution transformers like this 5MVA oil immersed model. Its delta high-voltage winding provides a free circulation path for third-harmonic currents, effectively suppressing grid harmonic distortion and significantly improving power quality. The star low-voltage winding with an accessible neutral point maintains stable neutral potential, enabling the transformer to withstand severe unbalanced three-phase loads without obvious voltage deviation. Compared with traditional Yyn0 connection transformers, Dyn11 models have stronger short-circuit resistance, lower zero-sequence impedance, and more stable operation in complex industrial and municipal power supply scenarios, which is why it is widely adopted in 30kV/33kV medium-voltage power distribution systems.
5.2 Why choose copper winding instead of aluminum winding for 5MVA high-capacity oil immersed transformers?
For 5MVA large-capacity electric power transformers operating under long-term heavy loads, pure copper windings have irreplaceable advantages over aluminum windings. Copper has higher electrical conductivity and lower resistivity, which effectively reduces no-load and load loss, lowers operating temperature rise, and improves overall energy efficiency. Copper windings also feature better ductility, oxidation resistance and thermal stability, avoiding burnout and aging failure caused by long-term overload operation. In addition, copper winding transformers have stronger current-carrying capacity and longer service life, lower long-term maintenance costs, and more stable output voltage, which fully meets the high-reliability operation requirements of 30kV/33kV medium-voltage heavy-load power supply projects.
5.3 What operating and installation conditions are required for this 5MVA 30kv/33kv oil immersed transformer?
This Dyn11 oil immersed copper winding transformer is suitable for indoor substation installation and outdoor floor-mounted installation, with strict and standardized operating environment requirements. The applicable altitude is within 1000 meters, and the ambient operating temperature ranges from -25℃ to +40℃, adapting to most conventional industrial and municipal environmental conditions. The equipment needs to be placed in a well-ventilated, dry and low-corrosion environment to avoid long-term exposure to salt spray, chemical corrosion and waterlogging. During operation, it is necessary to regularly inspect insulating oil quality, sealing performance and temperature changes. The dual 30kV/33kV voltage wiring must be matched with the local actual grid voltage to ensure safe, stable and efficient long-term operation of the equipment.
