Epoxy Bushing Solution for Switchgear Insulation Systems

In medium voltage switchgear design, bushings play a vital role in ensuring the safe and reliable transmission of electrical energy between internal and external circuits. Among various bushing types, epoxy resin bushings have become the preferred choice due to their excellent insulation properties, mechanical strength, and resistance to environmental stress.

Epoxy bushings used in switchgear are not generic components—they are engineered for specific roles within complex systems. Below are the most commonly applied epoxy bushings in switchgear and the insulation solutions they offer:

1. Wall-Through Epoxy Bushings

These bushings connect internal components with incoming or outgoing power cables. They provide robust electrical isolation, prevent flashovers, and resist contamination or moisture ingress. Their design also allows for compact switchgear layouts without sacrificing clearance.

2. Cable Entrance Bushings

Positioned at the entry points of power cables, these epoxy bushings ensure reliable insulation and mechanical support. They often feature customized dimensions to fit into ring main units (RMUs) and metal-clad switchgear, improving safety and assembly efficiency.

3. Partition Bushings

Used to separate different voltage zones within the cabinet, partition bushings made from cast epoxy effectively reduce phase-to-phase faults and support modular cabinet architecture. They help maintain insulation integrity while enabling safe compartmentalization.

4. Busbar Connection Bushings

These bushings serve as insulated channels for busbar systems inside switchgear. High-quality epoxy casting ensures they resist thermal expansion, arc tracking, and partial discharge, making them critical for high-current connections in compact spaces.

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Each bushing type contributes to a complete insulation strategy within the switchgear, helping prevent dielectric breakdowns, reduce maintenance needs, and meet evolving grid standards for compactness and reliability.

At Putai, we offer a broad selection of epoxy bushings for switchgear insulation, developed using advanced epoxy casting technology and stringent quality control. Whether for wall-mounted, cable-entry, or busbar systems, our bushings are designed to integrate seamlessly into 12kV to 40.5kV switchgear, supporting manufacturers in achieving safer and more consistent equipment performance.