Amazing Insulation Good Price High Quality EN 1KV/250-630A Transformer Bushing For Transformer

Transformer bushings play a crucial role in the efficient and safe operation of transformers, serving as the interface between the energized parts of the transformer and the external electrical network. In Europe, the design and specifications of transformer bushings are governed by stringent standards to ensure reliability, performance, and compatibility across different systems. This article provides an overview of transformer bushings in European standards.

1. Purpose and Function

Transformer bushings are designed to provide electrical insulation and mechanical support to the conductors passing through the transformer's tank wall. They serve several essential functions:

• Electrical insulation: Bushings prevent electrical current from escaping the transformer and ensure safe operation by insulating the energized conductors from the grounded tank.
• Mechanical support: Bushings support the weight of the conductors and provide stability, especially in high-voltage applications where mechanical stresses are significant.
• Sealing: Bushings help maintain the integrity of the transformer enclosure by sealing the openings through which conductors pass, preventing the ingress of moisture, dust, and contaminants.

2. European Standards

In Europe, transformer bushings are subject to standards set by organizations such as the International Electrotechnical Commission (IEC) and the European Committee for Electrotechnical Standardization (CENELEC). These standards establish requirements for various aspects of transformer bushings, including design, materials, performance, and testing procedures.

Key standards governing transformer bushings in Europe include:

• IEC 60137: This standard specifies the dimensions, electrical characteristics, and testing methods for bushings used in electrical apparatus, including transformers. It covers aspects such as the design of the bushing, insulation materials, and performance requirements.
• IEC 62271-211: This standard pertains to high-voltage switchgear and controlgear assemblies and includes requirements for bushings used in such equipment. It addresses aspects like the design, construction, and testing of bushings for high-voltage applications.
• EN 50386: European Norm (EN) 50386 specifies requirements for bushings used in medium-voltage transformers and switchgear. It covers aspects such as dimensions, materials, performance, and testing procedures specific to medium-voltage applications.

3. Design and Construction

Transformer bushings are typically constructed from high-quality insulating materials such as porcelain, polymer, or composite materials. The design of the bushing depends on factors such as the voltage rating, current capacity, environmental conditions, and application requirements.

Key design features of transformer bushings include:

• Insulating material: The choice of insulating material depends on factors like dielectric strength, mechanical strength, thermal properties, and resistance to environmental factors such as moisture, pollution, and UV radiation.
• Conductive components: Bushings may include conductive components such as metal flanges, conductors, and connectors to ensure electrical continuity and efficient current transfer.
• Grading components: In high-voltage applications, bushings may incorporate grading components such as capacitance screens or capacitive grading rings to ensure uniform electric field distribution and reduce electrical stresses.
• Sealing arrangements: Bushings are equipped with sealing arrangements such as gaskets, O-rings, or sealing compounds to prevent the ingress of moisture, gases, and contaminants into the transformer tank.