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Line Post Insulators
ANSI C29.7
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|
ANSI Class |
57-1 |
57-2 |
57-3 |
57-4 |
57-5 |
57-6 |
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|
Figure No. |
1 |
1 |
1 |
2 |
2 |
2 |
|
|
Leakage Distance (in) |
14 |
22 |
29 |
40 |
45 |
53 |
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|
Dry Arcing Distance(in) |
6.5 |
9.5 |
12.25 |
14.5 |
17.25 |
19.25 |
|
|
Cantilever Strength(lb.) |
2800 |
2800 |
2800 |
2800 |
2800 |
2800 |
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|
Low Frequency Flashover Voltage |
Dry（kV） |
70 |
100 |
125 |
140 |
160 |
180 |
|
Wet（kV） |
50 |
70 |
95 |
110 |
130 |
150 |
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|
Critical Impulse Flashover Voltage |
Pos（kV） |
120 |
160 |
200 |
230 |
265 |
300 |
|
Neg（kV） |
— |
— |
— |
— |
— |
— |
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|
Radio-Influence Voltage Data |
Test Voltage, Rms to Ground(kV) |
15 |
22 |
30 |
44 |
44 |
44 |
|
Maximum RIV at 1000 kHz(μV) |
100 |
100 |
200 |
200 |
200 |
200 |
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Height－H (in) |
9 |
12 |
15 |
17 |
20 |
23.5 |
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Shed Diameter－D(in) |
5.5 |
6 |
6.5 |
7 |
7.5 |
8 |
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Center hole nominal threaded size－M (in) |
3/4 |
3/4 |
3/4 |
3/4 |
3/4 |
7/8 |
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Dimension-R1(in) |
1 |
1 |
1 |
- |
- |
- |
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|
Dimension-R2(in) |
1 |
1 |
1 |
- |
- |
- |
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|
Dimension-b1(in) |
- |
- |
- |
1- 1/2 |
1- 1/2 |
1-1/2 |
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|
Dimension b2(in) |
- |
- |
- |
3/4(Min.) |
3/4(Min.) |
3/4(Min.) |
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Type of Neck |
F type |
N type |
|||||
.files/image002.jpg) |
Figure 3
Note: Dimension in inch
|
ANSI Class |
57-11 |
57-12 |
57-13 |
57-14 |
57-15 |
57-16 |
|
|
Leakage Distance (in) |
14 |
22 |
29 |
40 |
45 |
53 |
|
|
Dry Arcing Distance(in) |
6.5 |
9.5 |
12.25 |
14.5 |
17.25 |
19.25 |
|
|
Cantilever Strength(lb.) |
2800 |
2800 |
2800 |
2800 |
2800 |
2800 |
|
|
Low Frequency Flashover Voltage |
Dry（kV） |
70 |
100 |
125 |
140 |
160 |
180 |
|
Wet（kV） |
50 |
70 |
95 |
110 |
130 |
150 |
|
|
Critical Impulse Flashover Voltage |
Pos（kV） |
120 |
160 |
200 |
230 |
265 |
300 |
|
Neg（kV） |
— |
— |
— |
— |
— |
— |
|
|
Radio-Influence Voltage Data |
Test Voltage, Rms to Ground(kV) |
15 |
22 |
30 |
44 |
44 |
44 |
|
Maximum RIV at 1000 kHz(μV) |
100 |
100 |
200 |
200 |
200 |
200 |
|
|
Height－H (in) |
10 |
13 |
16 |
18.5 |
21.5 |
24.5 |
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Reference Shed Diameter－D (in) |
6 |
6.5 |
6.5 |
7 |
7.5 |
8 |
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Center hole nominal threaded size－M (in) |
3/4 |
3/4 |
3/4 |
3/4 |
3/4 |
7/8 |
|
.files/image004.jpg) |
Figure 4
Note: Dimension in inch
|
ANSI Class |
57-21 |
57-22 |
57-23 |
57-24 |
57-25 |
57-26 |
|
|
Leakage Distance (in) |
14 |
22 |
29 |
40 |
45 |
53 |
|
|
Dry Arcing Distance(in) |
6.5 |
9.5 |
12.25 |
14.5 |
17.25 |
19.25 |
|
|
Cantilever Strength(lb.) |
2800 |
2800 |
2800 |
2800 |
2800 |
2800 |
|
|
Low Frequency Flashover Voltage |
Dry（kV） |
70 |
100 |
125 |
140 |
160 |
180 |
|
Wet（kV） |
50 |
70 |
95 |
110 |
130 |
150 |
|
|
Critical Impulse Flashover Voltage |
Pos（kV） |
120 |
160 |
200 |
230 |
265 |
300 |
|
Neg（kV） |
/ |
/ |
/ |
/ |
/ |
/ |
|
|
Radio-Influence Voltage Data |
Test Voltage, Rms to Ground(kV) |
15 |
22 |
30 |
44 |
44 |
44 |
|
Maximum RIV at 1000 kHz(μV) |
100 |
100 |
200 |
200 |
200 |
200 |
|
|
Height－H (in) |
11 |
14 |
16.5 |
20 |
22.5 |
25 |
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|
Shed Diameter－D(in) |
6 |
6.5 |
6.5 |
7 |
7.5 |
8 |
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|
Center hole nominal threaded size－M(in) |
3/4 |
3/4 |
3/4 |
3/4 |
3/4 |
7/8 |
|
.files/image006.jpg) |
Figure 5
Note: Dimension in inch
|
ANSI Class |
57-31 |
57-32 |
57-33 |
57-34 |
57-35 |
57-36 |
|
|
Leakage Distance (in) |
14 |
22 |
29 |
40 |
45 |
53 |
|
|
Dry Arcing Distance(in) |
6.5 |
9.5 |
12.25 |
14.5 |
17.25 |
19.25 |
|
|
Cantilever Strength(lb.) |
2800 |
2800 |
2800 |
2800 |
2800 |
2800 |
|
|
Low Frequency Flashover Voltage |
Dry（kV） |
70 |
100 |
125 |
140 |
160 |
180 |
|
Wet（kV） |
50 |
70 |
95 |
110 |
130 |
150 |
|
|
Critical Impulse Flashover Voltage |
Pos（kV） |
120 |
160 |
200 |
230 |
265 |
300 |
|
Neg（kV） |
— |
— |
— |
— |
— |
— |
|
|
Radio-Influence Voltage Data |
Test Voltage, Rms to Ground(kV) |
15 |
22 |
30 |
44 |
44 |
44 |
|
Maximum RIV at 1000 kHz(μV) |
100 |
100 |
200 |
200 |
200 |
200 |
|
|
Height－H (in) |
11 |
14 |
16.5 |
20 |
22.5 |
25 |
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|
Shed Diameter－D(in) |
6 |
6.5 |
6.5 |
7 |
7.5 |
8 |
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