Operational Principles and Construction of Oil Immersed Transformers
China Oil Immersed Transformer Supplier,Factory 27 years in GuangDong
By Xinya Power editorial team
Operational Principles and Construction of Oil Immersed Transformers
The oil immersed transformer represents the most widely used technology for high-voltage power transmission and distribution. Its design relies on mineral oil or synthetic ester fluid, which serves a dual purpose: acting as a primary electrical insulator and functioning as a coolant. In this configuration, the core and windings are completely submerged in the fluid within a sealed steel tank. This immersion prevents oxidation of the cellulose insulation and significantly extends the operational lifespan of the unit compared to air-cooled alternatives.
Thermal management is a critical aspect of oil immersed transformer engineering. As the transformer operates, heat is generated in the windings and core. This heat is transferred to the oil, which circulates either naturally or via forced pumps through radiators or corrugated tank walls. The large surface area of the cooling fins dissipates the heat into the surrounding atmosphere. For high-capacity applications, oil immersed transformer** designs often incorporate On-Load Tap Changers (OLTC), allowing for voltage regulation without interrupting the power supply, ensuring grid stability under fluctuating load conditions.
Safety and diagnostics are managed through specialized accessories. A conservator tank accommodates the expansion and contraction of the oil due to temperature changes, while a Buchholz relay detects internal faults by sensing gas accumulation. Furthermore, Dissolved Gas Analysis (DGA) allows maintenance teams to assess the internal health of the oil immersed transformer by analyzing the chemical composition of the oil. Due to their superior dielectric strength and overload capability, these transformers remain the standard for outdoor substations and industrial power grids.
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