Corona rings are widely used for high voltage laboratory, high voltage bushing, power transformer, capacitor, gas insulated switchgear, substation and insulator industries.
These rings are available in various outer diameters such as 500mm, 750mm, 1000mm, 1500mm, 2000mm, etc. You can also choose from various shapes like round or square depending on your needs.
Contact our HIGHV team today to get you corona rings and solutions.
| Product Name | Corona Rings/Aluminum Corona Rings |
| Corona Ring Raw Material | Grade Aluminum Alloy 3A21/1060/6061/6063 Stainless Steel ASTM Grade 304/316L Copper C11000 |
| Matching Fasteners | ASTM A240 Stainless Steel Or Hot Galvanized Steel |
| Surface Finish | Polishing Silvery Bright, Ra3.2 Roughness |
| Other Surface Treatment | Blue Color Painting/Galvanized/Coating Insulating Varnish |
| Corona Ring Tube Wall Thickness | 2.0mm-10.0mm |
| OEM/ODM | As client’s drawings requirments |
| Middle Support Plate And Bracket | Aluminum material or It can be customized as drawing requirement |
| Inner Diameter of Corona Ring | Minimum 190mm |
| Outer Diameter of Corona Ring | Maximum 16000mm |
| Production Type of Corona Ring | Pipe Bending/Pressure Die Casting |
| Operating Voltage | 170kV-4200kV |
| Drawings Support | CAD/PROE/UG/SOLIDWORKS, etc |
| Ring Mould | At stock or as your drawing new design and production |
| Corona Ring Packaging | Carton Box/Wooden Pallet/Wooden Case |
| Loading Port | Shanghai/Ningbo/Any Other Port In China |
The corona rings are one of the most important components of the high voltage testing systems, and it’s also the first choice of corona sheielding parts for many HV engineers, products managers and end users.
For the corona ring, it is an ideal choice for corona treatment.
Generally the corona ring needs to be polished bright to achieve more smooth and no burr surface finish to ensure better corona control effect.
The corona rings are made of pure aluminum and alloy, with a surface treated by polishing or anodic oxidation, which makes it have a good surface hardness, dielectric strength and impact resistance. It also has a good insulation and can be easily repaired by grinding.
The corona ring is widely 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 ring ( corona shielding ring) 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.
The larger outside diameter, smooth polishing surface finish of aluminum corona 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/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 equipments and high efficient drawing software, which can make sure user’s every project to run more smoothly, safely and efficiently.
HIGHV custom made corona rings are widely used for below different high voltage systems:
Corona rings surface treatment is one of the major factors every buyer should consider when purchasing them from China manufacturers.
The surface treatment is used to treat the exterior of corona rings products by applying a thin complementary layer to their body surface.
There are many types of surface treatment processes for different applications.
What are the materials of corona rings? It depends on corona rings design and manufacturing process.
The custom aluminum corona rings are usually made from 6061 thin wall tubing or pipe that is formed and welded; with appropriate supporting brackets and other mounting standards.
In some conditions, the stainless steel materials will be used.
Aluminum alloy is a popular metal material to use for corona rings production.
Because it is both cost effective and high weather resistance.
The soft hardness is easily processing and polishing.
Die casting rings materials are usually A380 and ZL101.
ZL101 die casting aluminum alloy can be strengthened by heat treatment, which has natural aging ability, high strength and good plasticity.
ZL101 die casting aluminum alloy has excellent casting properties, good fluidity, small linear shrinkage, low thermal cracking tendency and high air tightness. But it has a slight tendency to produce porosity and shrinkage.
This alloy has high corrosion resistance, good weldability and general machinability.
A380 type die casting aluminum alloy is the most common special aluminum alloy because it integrates the characteristics of easy casting, easy machining, and good heat conduction.
It has strong mobility, pressure bearing, and high temperature resistance.
Although the A380 type alloy has always been considered convenient for machining, it is slightly rough due to its higher silicon content.
It is widely used in various products, including chassis of electrical equipment, engine brackets, gearboxes, furniture, generators and hand tools, etc.
Of course, it is also the material of the aluminum die casting corona ring.
Stainless steel is the kind of material which is not easy rust, acid resistance and corrosion resistance, so it is widely used in light industry and heavy industry.
Sometimes end users need some special corona rings made of stainless steel for outdoor applications.
Grade 201 reduces corona rings producing cost, increases mechanical strength and makes grade 201 work harden at a faster rate than grade 304 stainless steel material.
Grade 304 stainless steel material is a smart choice for your stainless steel corona rings project and longevity. It is cost-effective in comparison to other stainless steel materials.
Grade 304 material’s high quality and durability ensures that your product lasts a long time and the production of it is suitable for almost industry use.
Grade 316 stainless steel material, is a popular grade of stainless steel where superior corrosion resistance is of primary importance.
Grade 316 stainless steel corna ring is used for outdoor high voltage applications.
Usually, the wooden case and carton box are the two main types for corona ring packaging.
Before placing the corona ring into the wooden case or carton box, the product body is packaged with foamed paper firstly.
Wooden case and carton box four corners shall not be smaller than the outer diameter of the corona rings.
Corona ring’s surface four sides contacting with wooden case and carton box with foam mat protection.
In addition, clear labels are tagged on the outside of these packages for easy identification of these rings measurements and quality information.
In addition, the big and strength pallet will be used for placing the cartons boxes. It will help packaging more stable during the transportation.
The fumigation wooden pallets and non-fumigation pallets are two kinds of wooden pallets types.
Because of the limit and customs requirements of various countries, so non-fumigation wooden pallets are widely used for carton boxes base support.
When it comes to aluminum corona rings production, Highv’s 30 years of manufacturing experience really shows. Let’s introduce how to make aluminum corona ring here.
Are you thinking of designing your corona ring? If yes, then you have chosen the right platform as we are going to tell you all about the design of corona rings.
1.Choose The Right Material For High Voltage Corona Ring Design:
Aluminum alloy is the main material which have good weldability for corona ring design and production process. After the welding production, highv staff will set about doing polishing process. As you know, the soft aluminum material is easily for polishing for making sure the good corona effect. The ring are made of aluminum sheet and aluminum pipes. The bending tube production is easily for small rings. Because we only need the pipe bending machine to finish this step. The large rings production process is more difficult.
Grade 3A21, 6061, 6063 aluminum material are on highv stock. Before design the rings, we will confirm the right material with customers. More advantages of the common materials in corona shielding rings.
2.The Type Of Corona Ring Design:
Here two types of ring will be introduced. One is single ring without any brackets. Another one is known as corona ring set. It is also known as phase to earth ring set. The detailed design drawings will be offered by customers. Of course highv team could also help customer redesign new moulds and drawings.
3.Single Corona Ring VS Corona Ring Set Detailed Design Process:
Highv is professional at independent development and design. Our professional engineers team are skilled at AUTO CAD, PROE, SOLID WORKS and UG softwares. We are able to design, develop, produce and deliver rings according to customer detailed drawings, samples or just an idea. If the mould is our stock standard, the mould is free of charge. If it is customized one, the extra high voltage corona ring design drawing and fee will be needed.
Installing a corona ring at the power transformer bushing can be difficult especially if it is your first time to do or you are green hand in corona rings operation.
As you know, the corona ring raw material is aluminum. Ring body must be handled carefully otherwise it could suffer external damages that can result in the failure of high voltage test.
1. Access to the bushing
2. Remove the old corona ring
3. Check the surface of the new corona ring for damage, defects or foreign materials.
4. Remove protective film from both sides of corona ring. Leave corona shield in place.
5. Apply contact grease to bushing body and/or contact surface of new corona ring.
6. Install new corona ring onto bushing body, tightening with provided bolts to manufacturer’s specification and torque wrench setting.
7. Reinstall bushing on transformer
The corona rings mainly play a role in the corona control. The surface of the aluminum corona ring is treated by anodizing, and it has excellent characteristics such as high strength, good wear resistance, etc.
But how to choose the right size of corona rings?
In the current economic environment, more and more companies are looking for ways to reduce costs.
In all areas of the company, if you can find better options, you can reduce costs. The same applies to the purchase of goods. Many companies are hoping to find the best source of goods in China.
Although the cost is lower than the local production cost, some buyers worry that they will encounter quality issues when purchasing goods from Chinese factories.
In fact, if you work with professional suppliers in China, there is no need to worry about quality issues.
This guide will tell you how to get the best corona ring from China manufacturers.
Step 1: Compare the corona ring price from different suppliers
As we all know that China has a huge manufacturing base, which means you can compare the prices of your product from many different suppliers, so you can choose the best price for you.
Step 2: Negotiate with manufacturers to get a better corona ring price
When you find a good supplier and want to buy their corona ring product, you can negotiate with them to get a better price.
Step 3: Get corona ring samples from China suppliers
After you find some potential suppliers, ask them for free corona rings samples. When you receive the samples, check their quality, and ask your customers or partners to check them as well. If everything is OK, then negotiate with the suppliers about the good price and other details.
If you are a buyer, the best way to choose the professional corona rings manufacturer is to compare and choose two or three suppliers then communicate with them firstly by mail, telephone or Skype. This is an important step because it can help you reduce the risk of being cheated. If you find them trustful, then you can visit their factory in China.
The corona ring is used in high voltage test equipment and power systems, which is mainly made of aluminum alloy.
A grading ring, it is similar with corona ring, which is also used on high voltage equipment. But they encircle insulators rather than conductors.
Corona rings and grading rings are common parts in power transmission line and high voltage industry.
They are easy to operate, convenient to move, and fast to install.
Do you want to know difference between corona rings and grading rings?
Corona Rings:
A corona ring is a ring which is positioned at the top of an bushing or insulator. It is used to increase the effective creepage distance by reducing the voltage gradient near the insulator surface.
The corona ring may be either solid or tubular and is usually made of aluminum, stainless steel or other metal having low resistivity and high resistivity to weathering.
Grading Rings:
Grading rings are used on porcelain insulators to keep the electrical field off the porcelain body of the insulator and thus prevent flashover.
The grading rings are placed at a suitable distance from each other on a post insulator or at suitable intervals on a suspension insulator string so as to cover the whole length of porcelain body above the shed.
In post insulators these rings are generally metallic but in suspension type they are made of porcelain.