what are 6061 aluminum corona rings used for

What Are 6061 Aluminum Corona Rings Used For?

6061 aluminum corona rings are mainly used for high voltage industry to suppress corona effectively.

At sharp point (like bushing head) the electric field is high which results in corona.

Aluminum corona rings should be installed at this point.

The ring is suitable for the voltage form of alternating current (AC), which can distribute the high voltage evenly around the object to ensure that there is no potential difference (PD) between the various parts of the ring.

Here let Highv team introduce 6061 aluminum corona rings in power and high voltage applications.

Then you will be able to get a clear understanding of them.

The larger outside diameter, smooth polishing surface finish of 6061 aluminum corona rings and corona shielding rings can help control the local electric field.

So electric field gradient reduces and suppresses the corona.

As the testing voltage increases the outside diameter of the required corona ring and corona shielding ring must also increase to obtain better corona control effect.

Highv has rich decades of experience in corona rings design and shielding solutions technology, uses advanced manufacturing equipment and high efficient drawing software, which can make sure user’s every project to run more smoothly, safely and efficiently.

What Are 6061 Aluminum Corona Rings Used For

Aluminum corona rings are also known as aluminum corona shielding rings, which are widely used in high voltage test equipment and power systems (substations, high voltage transmission lines, AC voltage systems, etc.) and are mainly made of 6061 grade aluminum alloy.

The 6061 aluminum corona rings can be divided into single ring and phase to earth one. Meanwhile, in a lot of supporting AC/DC measurement of electrical equipment, often used 6061 aluminum corona rings.

6061 Aluminum Corona Rings For Power Transformers


Power transformer is an electrical equipment consisting of two or more windings, which are connected in the same magnetic field.

These iron cores do not conduct electricity, but they are magnetic conductivity.

The role of the power transformer is multi-faceted not only to increase the voltage and transfer the electric energy to the electricity consumption area, but also to reduce the voltage to the voltage used at all levels to meet the needs of electricity.

In short, both step-up and step-down must be completed by the power transformer.

Aluminum corona rings are common parts in power transformers.

They are easy to operate, convenient to move, and fast to install.

6061 Aluminum Corona Rings For High Voltage Bushings


The transformer HVDC bushing is the main insulation device outside the transformer box.

The lead wires of the transformer windings must pass through the insulating sleeve to insulate between the lead wires and between the lead wires and the transformer casing, and at the same time play the role of fixing the lead wires.

Due to the different voltage levels, the insulating bushing has the form of pure porcelain bushing, oil impregnated bushing and capacitor bushing.

The function of the corona ring is to distribute the electric field gradient and lower its maximum values below the corona threshold, either preventing corona discharge entirely or transferring its destructive effects from the valuable hardware to the ring.

Aluminum corona rings are mainly used in high voltage bushings.

A very similar related component, aluminum corona shielding cover, is also used on the top head of high voltage bushings.

6061 Aluminum Corona Rings For High Voltage Laboratory


The high voltage laboratory can provide a wide range of possibilities in the field of high voltage testing and research.

Many components and measuring systems are used in the high voltage laboratory, such as power transformer, voltage or current generator, high voltage divider, bushings, power cables, corona rings, grading rings and corona shielding sphere, etc.

High voltage can result in unwanted noise and corona, especially in the high voltage testing hall which voltage is ultra high.

So blate shape corona shield and half round shape corona rings are needed to suppress the corona.

Corona rings are common parts in high voltage laboratory testing center. They are easy to operate, convenient to move, and fast to install.

One of the main factors is the outside diameter of ring body, which have the main influence for potential gradient and corona effect on real measurement. Some end users need more larger diameter rings for their high voltage testing project.

6061 Aluminum Corona Rings For Gas Insulated Switchgear (GIS)


Since its practical application in the 1960s, Gas Insulated Switchgear (GIS) equipment has been widely used all over the world.

GIS is not only widely used in high voltage and ultra-high voltage fields, but also in UHV fields.

Compared with conventional open substations, GIS has the advantages of compact structure, small footprint, high reliability, flexible configuration, convenient installation, strong safety, strong environmental adaptability, small maintenance workload, and maintenance of its main components. The interval is not less than 20 years.

Gas Insulated Switchgear (GIS) is a high voltage electrical equipment with high operational reliability, low maintenance workload, and long overhaul period. Its failure rate is only 20%-40% of conventional equipment.

Aluminum corona rings for gas insulated switchgear (GIS), which can help offer good corona shielding effect of high voltage application.

6061 Aluminum Corona Rings For UHVDC Converter Valves

A converter station mainly comprises converters and DC and AC switchyards, and the converter valve system mainly consists of a converter transformer and the converter valve.

The UHVDC converter valve system is the core heart of UHV flexible DC transmission and bridge for DC and AC conversion, which represents the most advanced technology.

It has the highest technical content and the hardest challenge in the flexible DC main equipment.

China Southern Power Grid Corporation successfully developed the world’s first UHVDC converter valve system. The Wudongde ±800 kV ultra-high voltage project is undertaken by China Southern Power Grid Corporation, which is the world’s first in applying flexible DC technology to ±800 kV ultra-high voltage converter valves.

As the market leader, Highv provides high quality aluminum corona rings for UHVDC converter valves.

6061 Aluminum Corona Rings For High Voltage Capacitors

The high voltage capacitors banks are the core component of the AC/DC filter of the converter station. The capacity is usually between 3000-6000Mvar and consists of 15,000-30,000 capacitors, which play a role in filtering harmonics and providing reactive power.

DC transmission high voltage filter capacitor bank, which includes capacitors, pillar insulators and benches.

High voltage can result in unwanted noise and corona, especially in the high voltage capacitors banks which voltage is ultra high.

So aluminum corona rings are needed to suppress the corona during high voltage control process.

Aluminum corona rings are common parts in high voltage capacitors banks.

They are easy to operate, convenient to move, and fast to install.

6061 Aluminum Corona Rings For Power Cables

The high voltage power cables (HV power cable) is a cable used for electric power transmission at high voltage.

The power cable includes a conductor and insulation.

Power cables are considered to be fully insulated. This means that they have a full rated insulation system which will consist of insulation, semi-con layers, and a metallic shield.


Clearly, the aluminum corona rings are the major common parts for high voltage applications.

When it comes to aluminum corona rings and grading rings design, production and complete corona shielding solutions, Highv’s 30 years of manufacturing experience will really show.

More information about corona rings design and case studies, call us or email us to get more support for your high voltage testing projects.