Product Overview
Oil‑Immersed Power Transformers are widely used in power distribution equipment in power systems. Manufactured using high-quality materials and advanced processes, they feature low losses, low noise, high reliability, and a long service life. These products meet national energy efficiency standards and are suitable for a variety of indoor and outdoor environments, ensuring efficient power conversion and stable power supply.
Product Structure
Oil‑Immersed Power Transformers consist of five major components: the transformer body, oil tank, cooling system, protective device, and outlet device. These components work together to ensure power conversion and safe operation.
Core Structural Components
The transformer body, consisting of the core and windings, is the heart of energy conversion. The core, serving as the magnetic circuit medium, is made of laminated silicon steel sheets and requires single-point grounding. The windings are wound with copper wire and are divided into high-voltage and low-voltage windings. Voltage conversion is achieved through the turns ratio.
The oil tank, consisting of the main body, cover, and walls, is filled with insulating oil (typically naphthenic oil with a flash point of no less than 140°C), which provides insulation and heat dissipation. A slope is provided at the top to guide the gas to the gas relay. Cooling Devices: These are categorized by capacity and cooling method as radiators (natural cooling/air cooling) or coolers (forced oil circulation), ensuring efficient heat dissipation. Common cooling methods include ONAN, ONAF, and OFAF.
Protective Devices: These include oil conservators (to regulate oil volume and reduce oil oxidation), gas relays (to monitor internal faults), desiccant air extractors (to dry air), oil purifiers (to purify insulating oil), and explosion-proof pipes (to relieve pressure).
Outlet Devices: High- and low-voltage bushings connect the windings to the external circuit to ensure insulation and conductivity.
Types of Voltage Regulators
On-load tap-changers: These taps can be switched while energized. The rated current must match the transformer. Maintenance is required after 5-6 years of operation or 50,000 cycles.
Off-circuit tap-changers: They require power outages for operation, have a simple structure, and do not require a core lift for maintenance. They are suitable for applications with less demanding voltage regulation. III. Product Features
Efficient Heat Dissipation and Cooling Performance
The insulating oil transfers heat to the heat sink through natural convection or forced circulation, where it is then dissipated through air convection, ensuring the equipment maintains a low temperature under normal load, improving operating efficiency and extending its lifespan.1 For example, forced oil air cooling (OFAF) significantly enhances the heat dissipation capacity of high-power transformers.
Excellent Insulation and Electrical Performance
The insulating oil has high electrical dielectric strength, effectively preventing breakdown between windings and between the winding and the core, and reducing partial discharge.
The oil-immersed design ensures stable insulation performance over long periods of operation, maintaining basic insulation levels even as the oil ages.
Compact Structure and Easy Maintenance
The fully sealed design reduces environmental impact, occupies a small footprint, and is easy to install and transport. Maintenance requires only regular testing of oil quality (e.g., moisture content and acidity) and replacement of aging components.
Protective devices such as desiccant and oil purifier automatically purify the oil, reducing maintenance frequency.
Application and Environmental Adaptability
It maintains stable operation in harsh environments such as high temperature and humidity, making it particularly suitable for outdoor and industrial locations. Environmental Protection and Safety Improvements
Modern products utilize low-toxic, biodegradable insulating oil to reduce environmental pollution risks. They strictly adhere to safety standards, employing features such as gas protection and explosion-proof pipes to prevent fire and explosion accidents. For example, high-ignition-point oil-immersed transformers further enhance fire safety.
Application Scenarios and Technical Advantages
Oil‑Immersed Power Transformers occupy a crucial position in power systems, particularly in high-voltage, high-capacity applications.
Product Specifications
Item Parameter Description
Usage Conditions: Outdoor installation, ambient temperature -40°C to 60°C
Models: S13, S18, S20, S22
Capacity Range: 630 to 4000 kVA
Rated Voltage: High Voltage/Low Voltage: 35/10 kV
Impedance Voltage: 6.5% to 7%
Insulation Class: Class A
Connection Group: Dyn11, Yyn0
Insulation Level: LI200AC85/LI75AC35
Compliant Standards: IEC60076-1, IEC60076-2, IEC60076-3, IEC60076-5
Applications:
Suitable for power distribution systems in urban power grids, industrial parks, commercial buildings, new energy power plants, and rural power grid reconstruction, meeting indoor and outdoor installation requirements. Its compact design and lightweight structure facilitate transportation and deployment, making it particularly suitable for applications requiring high energy efficiency, quiet operation, and environmental adaptability.
