FJP Grading Ring for Insulator

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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.

Type

Main Dimensions
(mm)

Weight
(kg)

L

H

H1

D

M

C

A

θ

xdfhd 

FJP-500XV-95

300

557

164

60

16

20

80

47.5°

6.80

LJ2-500XV-55

300

548

78

60

16

24

80

55°

7.60

LJ2-500XV-54

400

532

108

60

16

27

80

54°

8.20

LJ2-500XV-50

300

577

109

60

16

24

80

50°

8.00

LJ2-500XV-45

300

608

145

60

16

24

80

45°

7.20

Note:The main body is aluminum, and the rest are hot-dip galvanized steel parts.

 

 

Type

Main Dimensions
(mm)

Weight
(kg)

L1

L2

H

H1

a

D

Φ

C

DSGfsd2 

JP-300-N

352

652

392

120

80

32

18

24

5.2

J-330N

320

702

176

136

80

32

18

24

5

JP-330-NL

270

650

392

120

80

32

18

24

2.5

Note:The main body is aluminum, and the rest are hot-dip galvanized steel parts.

 

Type

Main Dimensions
(mm)

Weight
(kg)

L

L1

H

D

Φ

C

a

zgdz3 

JL-500XS

1050

600

230

50

18

24

60

6.20

LJ2-500XS

1050

600

230

50

18

22

60

6.20

FJ-500XS/GH

1050

600

230

60

14

22

60

14.3

FJ-500XS/GHE

1150

600

270

60

18

24

60

6.80

FJP-500XSL

1200

600

230

50

18

20

60

7.30

FJ-500XSL1

1200

600

230

50

18

22

60

7.30

FJ-500XSL2

1280

680

260

50

18

28

60

7.80

FJ-500XSL3

1280

680

285

50

18

24

60

8.00

LJ2-500XS/G

1150

600

230

60

18

24

60

6.80

 

Type

Diagram

Main Dimensions
(mm)

Weight
(kg)

L

L1

H

D

Φ

C

a

cjgh3 

FJP-330XS

1

900

600

231

32

14

22

120

10.6

FJP-330XD

2

700

600

275

32

18

20

80

9.6

Hot-dip galvanized steel parts

 

Type

Main Dimensions
(mm)

Weight
(kg)

L

L1

L2

H

D

Φ

C

DSGfsd2 

PV-330

815

300

390

130

32

18

22

4.8

Hot-dip galvanized steel parts

 

Type

Main Dimensions
(mm)

Weight
(kg)

L

L1

L2

L3

D

Φ

C

fdhfd5 

P-330X

800

700

380

280

32

18

18

5.48

P-330XL

800

700

380

280

32

18

18

2.70

The main body is aluminum or hot-dip galvanized steel

 

Type

Main Dimensions
(mm)

Weight
(kg)

L

L1

L2

H

H1

D

Φ

C

gfd6 

JP-330-X

800

270

350

220

145

32

18

18

4.2

FJP-330-NB

800

320

380

392

150

32

18

16

4.8

JP-330-XL800

800

270

350

220

145

32

18

18

2.1

The main body is aluminum or hot-dip galvanized steel

 


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