Why Corona Ring And Shield Are Used In UHVDC Converter Valve System?

The UHV flexible DC transmission is a new generation of transmission technology. Voltage source converter based high voltage direct current transmission (VSC-HVDC) has a several names, like HVDC Light (ABB), HVDC Plus (Siemens), HVDC MaxSine (Alstom) and Flexible HVDC (China). Whenever the need for finding more information of VSC-HVDC transmission, the first source we go to is usually Google. The easiest way to find VSC-HVDC transmission on Google is by searching “[VSC-HVDC transmission].”
Here below article also can help you learn more about the core system (converter valve) and complete shielding solutions for VSC-HVDC transmission.

What Is UHVDC Converter Valve System?

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.

In 2019, the Changji to Guquan ± 1100kV UHVDC transmission project was put into operation successfully. And this time, NR Electric (NR) provided complete equipment such as rectifier station converter valve system, DC control protection system, measuring device and so on for this project. NR Electric (NR) is one of the largest&ambitious protection and control manufacturers and leaders to one of the best protection&control solution providers across the world.

More information about PCS-8600 UHVDC converter valve system, please visit NR Electric official website.

China ±1100kV Changji Converter Station (The Picture Originates From NR Electric)

Which Advantage Can UHVDC Transmission Offer?

1. UHVDC transmission is used in tower capacity of power grid and DC power supply. The rapid development of country’s economy and the continuous advancement of urbanization have promoted the further development of urban power grids. At the same time, most of the urban power grid load has also been showing a growing trend, and people’s requirements for the supply and quality of electrical energy are constantly increasing.
2. UHVDC transmission projects are increasing these years, flexible HVDC can replace AC and DC interconnection. Which can help realize large-capacity and long-distance transportation of electric energy.
3. UHVDC transmission is used in isolated load power supply system. Because the flexible DC transmission technology can realize the direct power supply to the passive network, and at the same time there is no corresponding limit to the power of the transmission, so in the remote isolated charge power supply process, this technology can be fully utilized.

Why Does The Corona Ring And Shield Work For UHVDC Converter Valve System?

High voltage can result in unwanted noise and corona, especially in the converter station which voltage is ultra high. So blate shape corona shield and half round shape corona rings are needed  to suppress the corona.

Corona shield and corona rings are common components in DC transmission converter valve system. They are easy to operate, convenient to move, and fast to install. As you know, a lot of corona rings and shields are used in a huge DC transmission converter which ensures project to run more smoothly, efficiently and safely. When it comes to your converter station project, corona rings and shields from Highv can help you finish all.

One of the main factors is the outside diameter of ring body, which have the main influence for potential gradient and corona effect on converter station. Some end users need more larger diameter rings for their converter station project. We have to mention it that our processing capacity of corona ring diameter is up to 16000mm. Here in Highv, from mould design to mass production, you can find every thing and corona shielding solutions you like.

How To Design The Corona Ring And Shield For UHVDC Converter Valve System Project?

Aluminum corona ring and shield design is the basic and important part on converter valve system project.

• Firstly, our professional engineers team will help customers choose the right material of corona rings and shields. Different grade aluminum material have each advantages and functions. Grade 3A21, 6061, 6063 aluminum are the main materials for these corona products production. Want to know what is the common materials in corona shielding rings?
• Secondly, we need to know what is customers voltage application on a converter station project. As you know, converter station voltage class is from lower ±320kV and up to ±1100kV. So the application voltage decides which type corona rings and shields are designed and used.
• Thirdly, Highv expert team will help statistic the installation data of rings and shields on the converter valve. After all detailed information are confirmed, we will design the CAD or Solidworks drawings with customers engineers together.

Corona Ring And Shield Showcase For UHVDC Converter Valve System

Highv is the world leader in corona ring and grading ring manipulation, we are top leader Chinese corona shields factory, and power and industry solutions provider. When it comes to aluminum high voltage corona rings and corona shields design, production and complete solutions, Highv’s 30 years of manufacturing experience will really show.

Have a project to inquiry or need solutions of aluminum corona rings and shields, call us or email us to get more support for your high voltage projects.