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Post insulators

Post insulators

  • standard; IEC and ANSI
  • Color:brown and gray

MAIN DIMENSTIONS AND STANDARD PARTICULARS

 

ANSI Class

With long stud

57 -1L

57-2L

57-3L

57-4L

With short stud

57-1S

57-2S

57-3S

57-4S

Leakage distance/in mm

14  356

22 559

29  737

1015

Dry arcing distance/in mm

6 1/2 165

9 1/2  241

12 1/4 311

368

Cantilever strength/lb kN

2800 12.5

2800 12.5

2800 12.5

12.5

Fig. No

1

2

3

4

Average flashover voltage

Low-frequency

Dry/kV

80

110

125

150

Wet/kV

60

85

100

125

Critical-impulse

Positive/ kV

130

180

210

255

Negative/ kV

155

205

260

340

Radio-influence voltage date

Test voltage to Ground/ kV

15

22

30

44

Maximum RIV at 1.000kc/μV

100

100

200

200

For ANSI Class

57-1S

57-1L

57-2S 3S 4S

57-2L 3L 4L

 

 

Main dimensions steel stand mm

A

1 3/4 44.5

7 178

1 3/4 44.5

7 178

B

1 7/16 36.5

4 1/2  114

1 7/16 3

.5

4 1/2  114

C

1 7/32 31.0

1 7/32  31.0

1 7/32 31.0

1 7/32  31.0

D

3/4

3/4

3/4

3/4

E

5/8

5/8

3/4

3/4

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