High Voltage Wall Bushing

分类 High Voltage Wall Bushing

High Voltage Wall Bushings for substations, transformers, switchgear, and power transmission systems.

Available in porcelain, epoxy resin, and composite polymer designs from 6kV to 245kV with current ratings up to 10000A.

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Product Details:

A High Voltage Wall Bushing is an electrical insulation device designed to safely pass a conductor through grounded walls, partitions, transformer tanks, switchgear enclosures, or building structures while maintaining electrical insulation between the energized conductor and the grounded surface. Wall bushings are widely used in power transmission and distribution systems, substations, switchgear, transformers, and industrial electrical installations.

Available in porcelain, epoxy resin, and composite silicone rubber constructions, high voltage wall bushings are designed for voltage classes ranging from 6kV to 245kV and beyond.

Features

Excellent electrical insulation performance
High mechanical strength and load-bearing capability
Suitable for indoor, outdoor, or indoor-outdoor installations
Available with copper or aluminum conductors
Resistant to moisture, UV radiation, and environmental pollution
Long service life with minimal maintenance
Available in porcelain, resin, and composite polymer designs

Construction Types

Porcelain Wall Bushing

High-strength electrical porcelain insulation
Excellent weather resistance
Suitable for medium and high-voltage applications
Widely used in substations and switchgear

Composite Wall Bushing

Silicone rubber housing
Fiberglass reinforced epoxy core
Lightweight and anti-pollution design
Excellent seismic performance

Resin Cast Wall Bushing

Epoxy resin insulation
Compact dimensions
Ideal for indoor switchgear and dry-type transformers

Technical Specifications

Parameter	Value
Rated Voltage	6kV – 245kV
Rated Current	200A – 10000A
Frequency	50/60Hz
Conductor Material	Copper or Aluminum
Insulation Material	Porcelain, Epoxy Resin, Composite Polymer
Installation Type	Indoor, Outdoor, Indoor-Outdoor
Lightning Impulse Withstand Voltage	Up to 1050kV
Power Frequency Withstand Voltage	According to IEC Standards
Ambient Temperature	-40°C to +50°C
Altitude	Up to 1000m (higher on request)

Rated Voltage kV	Power Frequency Withstand Voltage ≥kV			Lightning Impulse Withstand Voltage ≥kV
Rated Voltage kV	Dry/Wet Withstand	Break Through	Visible Corona	Lightning Impulse Withstand Voltage ≥kV
6	23	58	/	60
10	30(37.5)	75	/	75(93.8)
20	50	120	14.8	125
35	80(100)	176	25.8(32.2)	185(231)

Main Applications

Electrical substations
Power generation plants
Transmission and distribution networks
Transformer installations
GIS and AIS switchgear
Ring Main Units (RMU)
Industrial power systems
Busbar wall penetration systems
Renewable energy projects

Advantages

Ensures safe conductor passage through grounded structures
Prevents flashover and insulation failure
Enhances system reliability and operational safety
Supports high current and high voltage applications
Suitable for harsh environmental conditions
Available in customized dimensions and ratings

Available Voltage Classes

Voltage Class	Typical Applications
6kV – 12kV	Distribution Switchgear
24kV – 36kV	Medium Voltage Substations
40.5kV – 72.5kV	Transmission Networks
126kV – 245kV	High Voltage Substations
Above 245kV	Extra High Voltage Systems

Model Meaning

C – indoor copper conductor wall bushing.
CL – Indoor – aluminium conductor wall bushing.
CWL – outdoor – indoor aluminium conductor wall bushing
CB – Indoor – round conductor ceramic wall bushing.
CWB – outdoor – indoor round conductor ceramic wall bushing ;
B – bending damage load rating, 7.5kN.
CLB – indoor aluminium conductor wall bushing (reinforced)
CWLB – outdoor – outdoor aluminium conductor wall bushing (reinforced)
CW – outdoor – indoor copper conductor wall bushing
CWWL – Outdoor – Indoor anti-pollution aluminium conductor wall bushing
CWW – Outdoor – Indoor anti-pollution copper conductor wall bushing
CM – Indoor busbar wall bushing
CMW – Outdoor busbar wall bushing
CMWW – outdoor – indoor anti-pollution copper conductor wall bushing
Example: Model CWWL-35/630-3
35kV, 630A current, outdoor and indoor anti-pollution aluminium conductor wall bushing , suitable for class 3 fouling area.
Example: CWWL-35/630-1-G
35kV, 630A, outdoor-indoor highland anti-pollution aluminium conductor wall bushing for class 1 foul areas.
Example: Model CWWB-35Q/630
35kV, 630A, large creepage distance copper conductor wall bushing

Working Conditions

The bushing is suitable for use in ambient temperatures from -40°C to 40°C. It is not suitable for use under conditions that would reduce the performance of the casing or in the case of condensation on the surface of the indoor part of the casing.
When the ambient temperature of the bushing is above +40°C, but not exceeding +60°C, it is recommended that the rated current load of the bushing be reduced by 1.8°C for every 1°C increase in ambient temperature.
When the bushing is used at an ambient temperature higher than +40°C and in accordance with the maximum permissible heating temperature specified in GB12944.1, Article 5.1, the operating current is allowed to be overloaded for a long period of time, and it is recommended that the rated current be reduced by minus 0.5% for every 1°C decrease in ambient temperature 0.5%, but the increase should not be greater than 20% of the rated current.
The bushings can be divided into five types according to the place of use: indoor common type, outdoor-outdoor common type, outdoor-indoor anti-pollution type, outdoor-indoor plateau type, outdoor-indoor plateau anti-pollution type.
The indoor general type is generally suitable for installation sites up to 1000m above sea level, but the installation site should be free of obvious dirt.
The outdoor and indoor anti-pollution type is suitable for dirty areas where the installation site does not exceed 1000m above sea level. For 35kV casing in severely and heavily fouled areas, 63kV oil-paper capacitive wall bushing can be used.
The outdoor and indoor plateau type is suitable for installation sites up to 3000m above sea level.
The outdoor and indoor plateau type is suitable for installation in dirty areas with an altitude of 3000m or less.