The Role Of Epoxy Resin Bushings In Transformer Insulation Design
In modern power equipment engineering, the epoxy bushing is a core component in the transformer insulation structure. It plays the role of the basic channel for conducting current from the internal winding conductive part to the external high voltage system, and at the same time, it undertakes the responsibility of insulation and isolation. Transformer design specifications have clear requirements for the electrical parameters and mechanical structure of this component. Its overall structure typically uses a single-cast epoxy resin material to encapsulate the current-carrying conductor, forming a stable solid insulation system.
Structural Composition and Installation Location
The epoxy resin bushing component used in transformers typically includes a center conductor, epoxy resin insulator, and external connecting components. The center conductor is responsible for current transmission, while the surrounding epoxy resin insulation material provides necessary dielectric isolation. Vacuum solidification technology is used during the molding process to reduce internal voids, thereby improving the electric field distribution and insulation quality within the bushing. This component is generally installed on the top or side wall of the transformer casing, allowing internal conductors to safely pass through the grounded casing and connect to external lines.
Insulation Structure Subdivision Analysis
Insulation Material Design
epoxy resin cast bushing uses high dielectric strength epoxy resin solid insulation material, which is formed in one step through molding or casting processes. The material itself exhibits resistance to moisture and chemical media, and can withstand the effects of electrical aging and partial discharge. Unlike traditional oil-paper insulation or porcelain bushings, this solid insulation method eliminates the need for internal oil cavities or multi-component assemblies, reducing the probability of potential insulation defects.
Electrical Insulation Parameters and Verification
In high-voltage transformers, the insulation thickness, oil-side length, and capacitor core structure of the epoxy resin bushing need to be analyzed and verified according to relevant standards to ensure that the designed insulation structure achieves the predetermined withstand voltage under power frequency voltage and lightning impulse voltage conditions.
