Oil-immersed power transformers are usually equipped with a main oil tank.

2026-05-08

Oil-immersed power transformers are usually equipped with a main oil tank.
The main functions of the oil tank are as follows:
1. Insulation Function
Transformer oil provides electrical insulation for the windings and core, preventing electrical breakdown and short circuits.
2. Cooling and Heat Dissipation
The transformer oil transfers heat generated during operation to the radiators, where the heat is dissipated into the surrounding air.
3. Housing the Core and Windings
The main oil tank contains and protects the transformer core, windings, and other internal components.
4. Mechanical Protection and Sealing
The tank provides structural support, sealing, moisture protection, and mechanical protection for the internal parts.
5. Oil Circulation Support
The tank works together with radiators and conservators to maintain proper oil circulation and stable operating conditions.

Main Oil Tank
Contains the transformer core, windings, and insulating oil. It serves as the main enclosure and provides insulation and cooling.
Core
Made of laminated silicon steel sheets to provide a magnetic path and reduce energy loss.
Windings
Usually divided into high-voltage and low-voltage windings for power transmission and voltage transformation.
Transformer Oil
Acts as both an insulating medium and a cooling medium.
Radiators / Cooling System
Used to dissipate heat generated during transformer operation.
Conservator Tank
Accommodates oil expansion and contraction caused by temperature changes.
Breather
Prevents moisture from entering the transformer during air exchange.
Bushings
Provide insulated passages for electrical conductors entering and leaving the transformer.
Tap Changer
Adjusts the transformer voltage ratio, either on-load or off-load.
Protection Devices
Including Buchholz relay, pressure relief device, oil level indicator, temperature indicator, etc., to ensure safe operation.

News

Cases

Oil-immersed power transformers are usually equipped with a main oil tank.

PSA Nitrogen Generator

Membrane Separation Nitrogen Generator

Nitrogen Purification Skid

Hytrogen Purification Skid

Ammonia Cracker

Instrument Air Skid

Industrial Oxygen Generator