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V2440 Polyester Varnished Glass Fabric
It is manufactured by electrical non-alkali fiberglass fabric which is impregnated uniformly with modified polyester varnish,then to be cured and dried off. Its thermal Class is F, and has higher electrical and mechanical properties. It is suitable for wrapping and lining insulation of motors and electrical appliances. |
Thickness & Tolerance
| Nominal thickness (mm) |
0.10 |
0.12 |
0.15 |
0.18 |
0.20 |
0.25 |
|
Tolerance (mm) |
±0.010 |
±0.012 |
±0.015 |
±0.018 |
±0.020 |
±0.025 |
Properties
| Item |
Values |
|
Nominal thickness (mm) |
|
0.10 |
0.12 |
0.15 |
0.18 |
0.20 |
0.25 |
|
Effect of fabric to oil |
In transformer oil No.45 at 105±2℃for 72h,acid value of oil shall not be more than 1.0mg KOH/g |
|
Effect of oil to varnished fabric |
In transformer oil No.45 at 105±2℃for 48h ,no damage of varnish film. |
|
Hydrolysis resistance |
No damage of varnish film at 105±2℃ for 24h. |
|
Elongation at break % |
Lengthwise ≥ |
1.5 |
1.5 |
2.0 |
2.0 |
2.5 |
3.0 |
|
In the direction of 45°≥ |
15 |
15 |
15 |
18 |
20 |
20 |
|
Edge tearing resistance N |
Lengthwise ≥ |
5 |
6 |
7.5 |
10 |
20 |
25 |
|
45°向In the direction of 45°≥ |
50 |
60 |
75 |
80 |
90 |
120 |
|
Tensile strength
N/10mm width |
Lengthwise ≥ |
70 |
90 |
100 |
105 |
110 |
120 |
|
Crosswise ≥ |
40 |
50 |
60 |
65 |
70 |
80 |
|
In the direction of 45°≥ |
40 |
60 |
65 |
65 |
70 |
80 |
|
Joints for bias -cut , ≥ |
Before impregnation |
20 |
25 |
30 |
30 |
35 |
35 |
|
After impregnation |
20 |
20 |
20 |
30 |
30 |
30 |
|
Elongated by 10% in the direction of 45° |
2~12 |
2~12 |
3~15 |
3~15 |
4~16 |
5~20 |
|
Breakdown voltage
kV, ≥ |
at 23±2℃ |
5.0 |
6.0 |
7.0 |
7.5 |
8.0 |
9.0 |
|
Impregnated into water at 23±2℃ |
2.5 |
3.0 |
3.5 |
3.5 |
4.0 |
4.5 |
|
at 155±2℃ |
2.5 |
3.0 |
3.5 |
3.8 |
4.0 |
4.5 |
|
Elongated by 6% in the direction of 45° |
3.0 |
3.0 |
3.5 |
4.0 |
4.0 |
4.5 |
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