Key components include
Laminated from high-permeability silicon steel sheets to form a closed magnetic circuit.
Made of copper or aluminum wire, serving as conductive loops wound around the core.
Houses insulating oil and supports other components.
Compensates for oil volume changes.
Prevents moisture ingress.
Releases excessive internal pressure.
Enhance heat dissipation.
Provide external insulation for terminals.
Adjusts voltage ratio.
Detects internal faults.
Monitor and maintain oil quality.
Serves as the primary insulation and cooling medium.
product details
Performance Features
Cooling Methods
Oil-Natural Air-Natural (ONAN): Relies on natural oil convection.
Oil-Natural Air-Forced (ONAF): Adds fans to cool tank and pipes.
Oil-Forced Air-Forced (OFAF): Uses pumps to circulate oil through external coolers.
Advantages
Oil-immersed transformers are suitable for various power grid scenarios, featuring excellent structure and performance.
They efficiently convert and distribute electrical energy, ensuring stable and secure power supply.
Insulation Structure
Internal Insulation
Main Insulation: Oil-paper barriers isolate windings from grounded parts/other windings.
Longitudinal Insulation: Separates sections within the same winding.
External Insulation: Bushings insulate terminals from ground/each other.
Operational Parameters
Temperature Limits
▪Top oil temperature ≤ 90°C (85°C recommended for longevity).
▪Alarm triggers at 80°C.
Overload Capacity
▪Permits 1.1–1.2× rated current during emergencies.
▪Monitor load/temperature post-alarm; reduce load if necessary.
Definition & Structure
An oil-immersed transformer is a common power equipment that performs critical tasks such as voltage conversion and power distribution in electrical grids. It is widely used in urban/rural power grid upgrades, industrial/mining applications, combined transformers, and prefabricated substations.