35kV Level Oil Immersed Transformer Product Introduction
Low no-load & load loss, energy saving design
Strong short-circuit withstand capability
Low partial discharge & low operation noise
ONAN/ONAF optional dual cooling system
Excellent insulation performance via vacuum drying & oil filling process
Good overload capacity and thermal stability
Fully sealed tank structure, less maintenance
Long service life, adaptable to harsh outdoor environment
Strict type test passed, high operation reliability
1. Product Overview
The 35kV level oil immersed transformer is a core power conversion equipment widely applied in medium and high-voltage power distribution systems. Adopting mature oil-immersed insulation and ONAN cooling technology, this product is independently developed and optimized for 35kV power grid transmission, industrial power supply, and new energy grid-connected scenarios. It mainly realizes the voltage conversion between 35kV high-voltage side and 10kV/0.4kV low-voltage side, stably transmitting electric energy for power distribution networks and end-user equipment.
Different from dry-type transformers, this oil immersed model takes high-quality mineral insulating oil as the insulation and heat dissipation medium. It features excellent heat dissipation performance, strong overload resistance, and outstanding electrical stability. The whole machine adopts a fully sealed corrugated tank structure, which effectively isolates internal insulation oil from external air and moisture, avoiding oil deterioration and internal component dampness. With strict compliance with IEC international standards and national energy efficiency grade 1 standards, the product has low loss, low noise and high operational reliability, and can adapt to long-term continuous outdoor and harsh industrial environment operation, serving as key power guarantee equipment for power grids, industrial and mining enterprises, and new energy projects.
2. Core Product Parameters
The 35kV oil immersed transformer supports multiple capacity specifications to meet the power demand of different application scenarios. The core technical parameters are standardized and calibrated, with stable and reliable data, covering mainstream models in the market. The detailed parameters are shown in the table below:
Parameter Item | Technical Specification |
Rated Voltage | High voltage side: 35kV; Low voltage side: 10kV/0.4kV (customizable) |
Rated Capacity | 500kVA ~ 31500kVA (full series optional) |
Phase & Frequency | Three-phase, 50Hz/60Hz optional |
Cooling Method | ONAN (Oil Natural Air Natural) |
Vector Group | Dyn11 (standard), Yyn0 (optional) |
No-load Loss | Compliant with national first-class energy efficiency standard, 15%-20% lower than traditional ordinary models |
Load Loss | Low temperature rise design, effectively reducing operational energy consumption |
Partial Discharge Value | ≤10pC, low partial discharge, stable insulation performance |
Noise Level | ≤55dB, lower than industry standard |
Insulation Level | 35kV grade, meeting high-voltage insulation safety standards |
Operating Temperature Range | -40℃ ~ +45℃, adaptable to diverse climatic environments |
3. Product Core Features
3.1 Low Energy Consumption & High Energy Efficiency
This series of transformers adopts high-permeability cold-rolled grain-oriented silicon steel sheets as the core material, combined with optimized electromagnetic calculation and winding structure design. It effectively reduces no-load loss and load loss, fully meeting national first-class energy efficiency requirements. Compared with conventional old-fashioned transformers, the annual operational energy consumption is significantly reduced, bringing long-term energy-saving benefits for users and lowering the overall operating cost of power systems.
3.2 Stable Performance & Strong Durability
The whole machine adopts a fully sealed corrugated tank integrated structure, without oil storage cabinet design. The insulating oil is completely isolated from the external environment, which prevents oil oxidation, moisture absorption and deterioration, and avoids internal insulation aging. The winding adopts high-purity copper wire winding with uniform voltage distribution, and can withstand 4KA thermal short-circuit impact and 10KA dynamic short-circuit impact. It has strong short-circuit resistance and mechanical stability, with a service life of up to 30 years under normal operating conditions.
3.3 Low Noise & Low Partial Discharge
Through optimized core lamination process and winding damping design, matched with low-noise structural accessories, the operating noise is effectively controlled, 8-10dB lower than the industry standard. Meanwhile, the precise insulation structure layout greatly reduces partial discharge values, avoiding insulation breakdown caused by long-term partial discharge, ensuring safe and stable operation of the equipment for a long time, and being friendly to urban and residential surrounding environments.
3.4 Simple Structure & Strong Adaptability
The product has a compact overall structure, small floor space, and no need for complex auxiliary heat dissipation equipment. It supports outdoor open-air installation and indoor box-type installation. It can adapt to high temperature, low temperature, humid and other complex working conditions. The optional voltage regulation device can realize on-load or off-load voltage regulation, effectively solving the problem of grid voltage fluctuation and ensuring stable output voltage of terminal equipment.
4. Application Scenarios
With stable performance and strong environmental adaptability, 35kV oil immersed transformers are widely used in medium and high-voltage power supply and distribution scenarios, covering municipal power grids, industrial production, new energy development and other fields:
4.1 Urban & Rural Power Grid Construction
It is used for voltage conversion and power distribution in urban substations, rural power grid renovation and regional power supply stations, undertaking the core power transmission task from high-voltage grid to terminal distribution network, and ensuring stable power supply for residential electricity and urban public facilities.
4.2 Industrial & Mining Enterprises
Suitable for self-provided power supply systems of large factories, mines, chemical plants, steel plants and other high-power industrial enterprises. It can bear long-term high-load operation, meet the continuous power demand of industrial production equipment, and adapt to harsh industrial environments such as dust and humidity.
4.3 New Energy Power Generation Projects
Widely used in wind power plants, photovoltaic power stations and energy storage power stations, serving as step-up and step-down equipment for new energy grid connection. It converts the power generated by new energy units into grid-compliant voltage, realizing safe and efficient grid-connected power transmission.
4.4 Large Public & Transportation Facilities
It provides stable power guarantee for airports, ports, railway stations, industrial parks and logistics parks. It can cope with peak power consumption fluctuations of large facilities and ensure the safe and orderly operation of public infrastructure.
5. Product Maintenance & After-Sales Service
5.1 Daily Maintenance Guidelines
The fully sealed design of the product realizes low-maintenance operation, and no regular oil replacement and core lifting inspection are required in daily use. Users only need to carry out routine inspection and maintenance: regularly check whether the transformer shell has oil leakage, whether the wiring terminal is
