A 35 kV busbar is typically a medium-voltage tubular busbar, which can be fully insulated or aluminum, used for collecting and distributing electrical energy in substations and switchgear.

Overview

A 35 kV busbar operates at the 35 kV voltage level and serves as a critical node in power systems, connecting generation sources to transmission or distribution networks and acting as a "power transportation hub" in applications like photovoltaic power stations . It is designed to handle high currents efficiently while maintaining safety and reliability.

Common Types

1. Tubular Busbars: These are cylindrical conductors, often made of aluminum or copper, providing high current-carrying capacity with reduced weight and cost compared to traditional cables . Tubular busbars are preferred for their compact structure, mechanical strength, and ease of installation.
2. Fully Insulated Busbars: These busbars are wrapped with one or more layers of insulation, such as EPDM, PTFE, or epoxy resin, which allows reduced phase-to-phase spacing and enhanced safety in cramped or outdoor environments . Full insulation also improves resistance to UV, moisture, and mechanical stress.
3. Aluminum Alloy Busbars: Aluminum is lighter than copper and suitable for weight-sensitive installations, such as overhead lines or wind-farm step-up stations. While aluminum has lower conductivity than copper, its lower density and cost make it ideal for large-scale medium-voltage systems .

Connection Schemes

35 kV busbars can be configured in several ways:

• Single Busbar Connection: A simple layout connecting all feeders to a single bus, suitable for straightforward distribution .
• Sectionalized Single Busbar: Divides the bus into sections with isolators, improving operational flexibility and reliability .
• Integration with Switchgear: Busbars are often installed inside metal-enclosed or gas-insulated switchgear, providing protection against environmental effects, arc flash, and short-circuit events .

Structural Features

The busbar assembly typically includes:

• Steel support frames and strain insulator strings for mechanical stability .
• Arc flash protection devices to rapidly clear faults.
• Compact layouts to save space in urban substations or indoor switchgear .

Summary

A 35 kV busbar is generally a medium-voltage tubular busbar, which may be fully insulated or aluminum, designed for high-current distribution in substations and switchgear. Its type is chosen based on current rating, installation environment, insulation requirements, and operational flexibility, with common configurations including single or sectionalized busbar schemes .