China-Grid Power Technology Co., Ltd.

Preformed Power Fitting, Grid Fitting, Grid Equipment manufacturer / supplier in China, offering FJH Type Grading Ring for Insulator, Jk Type Galvanized Wire Rope Clamp (Steel Wire Clip), OT Type Copper Passing Through Terminals/Connecting Terminals and so on.

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FJH Type Grading Ring for Insulator

FOB Price:US $1 - 3.5 / Set
Min. Order (Sets) FOB Price
100+ US $1-3.5 / Set
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Min. Order: 100 Sets
Port: Fuzhou, China
Production Capacity: 30000PCS/Year
Payment Terms: L/C, T/T, Western Union

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Basic Info.

Model NO.:From FJH-500 to FJH-110KL
Usage:Overhead Transmission Line
Energysaving Property:High
Installation Time:Short
Certificate:ISO9001 & SGS Factory Audit Report
Quality Rank:Higher Than National Electric Criteria
Transport Package:Wood Tray
Origin:Fuzhou City, Fujian Province, P. R. China
HS Code:85363000

Product Description

Grading ring is also used on high voltage equipment. Grading rings are similar to corona rings, but they encircles insulators rather than conductors. Although they may also serve to suppress corona, their main purpose is to reduce the potential gradient along the insulator, preventing premature electrical breakdown. 

The potential gradient (electric field) across an insulator is not uniform, but is highest at the end next to the high voltage electrode. If subjected to a high enough voltage, the insulator will break down and become conductive at that end first. Once a section of insulator at the end has electrically broken down and become conductive, the full voltage is applied across the remaining length, so the breakdown will quickly progress from the high voltage end to the other, and a flashover arc will start. Therefore, insulators can stand significantly higher voltages if the potential gradient at the high voltage end is reduced.

The grading ring surrounds the end of the insulator next to the high voltage conductor. It reduces the gradient at the end, resulting in a more even voltage gradient along the insulator, allowing a shorter, cheaper insulator to be used for a given voltage. Grading rings also reduce aging and deterioration of the insulator that can occur at the HV end due to the high electric field there.

FJH Type Grading Ring for Insulator
 FJH Type Grading Ring for Insulator
TypeDimension (mm)Weight (kg)
FJH-110KL250Φ44(Φ26) 0.55 
FJH Type Grading Ring for Insulator
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China-Grid Power Technology Co., Ltd.

- Fujian, China
- Manufacturer/Factory

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