Product Overview

The 110kV porcelain bushing is a key component in high-voltage power transmission and transformation systems. It is mainly used as an insulating support and isolation part when high-voltage conductors pass through walls or equipment housings. It ensures high-voltage electricity can safely enter or exit transformers, circuit breakers, GIS (Gas-Insulated Switchgear), and other electrical equipment.

Structure and Materials

The 110kV porcelain bushing usually consists of the following parts:

Porcelain body: Made from high-strength ceramic material with high alumina content (generally ≥95%) to ensure excellent electrical insulation and mechanical strength.

Skirt: The flared projection on the surface of the porcelain body, designed to increase creepage distance. Outdoor types usually use a multi-skirt structure with wide spacing to prevent flashover from rain.

Flange: The metal connectors at both ends of the porcelain body, used to secure the bushing to walls or equipment.

Conductor: The conductive rod that passes through the bushing, used to carry current.

Seals: Installed between the flange, porcelain, and conductor to prevent moisture and humidity from entering.

Main Standards

The manufacture and testing of 35-110kV porcelain bushings must follow strict national and industry standards:

GB/T 12944-2011: "High Voltage Through-Wall Porcelain Bushings"

GB/T 13026-2017: "AC Capacitive Bushing Types and Dimensions"

JB/T 1542-1999: "Porcelain Bushings for 110 and 200kV Outdoor Minimum Oil Circuit Breakers"

DL/T 383-2010: "Artificial Rain Test Methods for High-Voltage Bushings in Polluted Areas"

Selection and Installation Tips

In practice, pay attention to the following when selecting and installing:

Determine voltage level: Make sure the system rated voltage is clear, and check the bushing's power frequency and lightning impulse withstand levels.

Assess pollution level: Choose a bushing with sufficient creepage distance based on the site's pollution (like industrial areas or coastal areas); usually requires a multi-skirt design.

Match rated current: The bushing's rated current should be at least 1.3 times the maximum load current of the circuit.

Consider environmental factors: Adjust insulation in high-altitude areas; in cold regions, make sure both the porcelain and seals can withstand low temperatures.

Check mechanical strength: Ensure the bushing can handle wind, seismic, and other mechanical loads during installation and operation.

Proper installation: Inspect the porcelain body for defects before installation, ensure the flange is connected securely, seals are tight, and follow standards strictly.

If you want detailed info on specific types (like through-wall bushings or transformer bushings) or models, you can ask anytime.

Parameters and Dimensions