Fyh Anti Corona Ring - China

Product Description

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 ring 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.

What is a grading ring?

A grading ring is very similar to a corona ring.

In fact, it can be said that grading rings and corona rings are two different names for the same device.

The difference lies in their primary purpose of use and location.

Grading rings surround an insulator rather than a conductor.

Their main purpose is to reduce the potential gradient along the insulator.

Grading rings help to balance the potential distribution on the string of suspension insulators.

As a result, graded rings increase string efficiency and prevent insulation breakdown.

The graded rings also act as corona rings to some extent.

Features.

Can be used for ultra-high voltage equipment

Extends the life of insulator surfaces

Easy installation on the antenna insulator of high-power radio transmitters

Increases the capacitance of the insulator Applications.

GIS (gas insulated switchgear), substations, lightning arresters, high voltage bushings, shunt reactors, power transformers, power cables (accessories), high voltage laboratories (high voltage test equipment), high voltage capacitor banks, high voltage transmission lines (overhead lines), current transformers, voltage transformers, etc.

Uses For decreasing the corona and making the cable operate safely, our company design one special corona coils.

It use aluminum alloy material, improve the electric filed in the preformed fitting end, increase the corona voltage one time.

Anti- corona model parameter specification table:

Model For cable diameter(mm) Clamping segment length L1 (mm) Total length L2(mm) Mass (kg)

FYH-10 9.0-11.0 200 320 0.19

FYH-12 11.1-13.0 200 320 0.19

FYH-14 13.1-15.0 200 320 0.19

FYH-16 15.1-17.0 200 320 0.19

FYH-18 17.1-19.0 200 320 0.19

FYH-20 19.1-21.0 200 320 0.19

FYH-22 21.1-23.0 200 320 0.19

Note: letters and numbers meaning: FYH-anti- corona; "-" after the application of cable diameter.

How are corona rings used?

Corona rings and corona ring combinations are necessary above 230kv, while high altitudes, high contamination and tight phase spacing may require the use of corona rings at lower system voltages.

What is the purpose of corona rings?

Smooth, large diameter spherical corona rings control the electric field by suppressing the generation of corona.

The diameter of the corona sphere must be increased to obtain corona suppression.

What are the types of products used with corona rings?

There are specific types of products that are used with corona rings, i.e. there are specific types of products that are used with corona rings, i.e. Corona discharge

Power

Insulators

Power transmission lines

Ring guards

Voltage measurement

Grading rings

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 , Hebei , 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.