Corona Ring - China

FYH Anti-corona Ring

Corona rings are annular metal rings that are fixed to the ends of bushings and insulator strings.

They are also referred to as anti-corona rings.

Corona rings are used to prevent corona discharges that occur in high voltage transmission lines.

Corona Ring

Corona rings are annular metal rings that are fixed to the ends of bushings and insulator strings.

They are also referred to as anti-corona rings.

Corona rings are used to prevent corona discharges that occur in high voltage transmission lines.

Corona discharge or corona loss is a major problem in EHV transmission lines that cause power loss.

One way to reduce corona discharge is to use corona rings.

How do corona rings work?

Corona discharge occurs when the electric field (potential gradient) on the surface of a conductor exceeds a critical value, called the critical destruction voltage.

The value of the critical destruction voltage varies with atmospheric conditions.

The value is about 30 kV/cm.

The electric field is greatest where the curvature is sharpest.

Therefore, corona discharges occur first at the points of greatest curvature - i.e., suspension points, corners and edges.

Corona rings are installed at these points to prevent corona formation.

Corona rings are electrically connected to conductors around points where corona discharges may occur.

Thus, due to its smooth circular shape, the corona ring distributes the electric field (or charge) over a wider area.

As a result, it reduces the potential gradient below the critical damage value.

Manufacturers typically recommend installing aluminum corona rings at the conductor end of string insulators for lines above 230 kV and at both ends of insulators for 500 kV.

Company Contact:

• Posted By: Shijiazhuang Huaneng Electric Power Fitting Co.,Ltd.

• Phone: 13630823632

• Address: No.189,Hengshan Street, Shijiazhuang High-tech Zone, Hebei Province, China., Shijiazhuang , China , China

• Email:

• Business Description: Shijiazhuang Huaneng Electric Power Fitting Co.
  
  Ltd. is a new company with abilities of R&D, manufacture and trade.
  
  The company locates in No.
  
  189, Hengshan Street, Shijiazhuang High-tech Development Zone, Hebei Province, China, covering the area 26,593 square meters.
  
  Shijiazhuang Huaneng Electric Power Fitting Co.
  
  Ltd. specially manufactures preformed helical fittings which are widely used in transmission line.
  
  Currently our company owns the big ability to produce lots of varied preformed helical fitting in one year, among them OPGW and ADSS fittings for optical cables, together with fittings for conductor line and earth-wire line which is developed recently passed the tests in the national Electric Power Construction Research Institute and Shanghai Electric Cable Research Institute, and passed identification of the expert group of Hebei Economic and Trade committee.
  
  Our company was named as a high-tech enterprise by Hebei Science and Technique Bureau.
  
  From the beginning of establishment, we pay more attention to the quality of products, strengthened the quality conception of employees, and build up a perfect quality-control system, so we have passed the qualification of ISO 9001: 2008 international quality system identification.
  
  In our company there are enough experts and advanced equipments for production and examinations, Our products have been sold to many localities in nation and overseas, and been used in lines of different voltage degree.
  
  Suffering the rigorous test in every kind of weather conditional, our products still work very well without any trouble occurrence.
  
  In order to offer the customer a exact and effective plan of reduce-vibration , Our company established a vibration-laboratory with the help of transmission line experts and the vibrate experts of the national power company.
  
  We can test the power characteristic and tired function of vibration damper, and test its reduce-vibration valuation in the the OPGW and ADSS optical cables, consequently providing a scientific trial basis for design of reduce-vibration in the projects.
  
  Our quality guideline: Regarding customer as our focus with attention, persisting in innovating in techniques, strengthening and perfecting quality-control system, providing the high-tech product for electric power developments.
  
  Our quantity target: The eligibility rate in products amounts to 100%; The customer approval attains 95%.
  
  Welcome each expert to visit our company and supervise our works.