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Electrical insulating paper has been used for more than 100 years and will be used extensively in the future. Best electrical insulating paper
As an insulating material, it still maintains its irreplaceable status in high-voltage or ultra-high-voltage application scenarios. The advantages of the large-scale application of the insulating paper produced by our company are summarized as follows:
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|
Technical Data |
IEC –test Standard |
Unit |
Standard Value |
Standard norm |
|
Thickeness Tolerances |
641 |
% |
± 10 |
IEC 621-2 |
|
Specific weight |
641 |
g/cm3 |
1,0-1,2 |
IEC 621-2 |
|
Longitudinal Elongation at break transversal |
641 |
% |
2.0 7.0 |
IEC 621-2 |
|
longitudinal Tensile Strenght Transversal |
641 |
N/mm2 |
80 40 |
IEC 621-2 |
|
Shrinkage until constant weight Longitudinal Transversal Max… Thickness |
641 |
% |
1,0 1,5 7 |
 |
|
 Moisture content Max….. |
641 |
% |
8 |
 |
|
Oil Absorption |
641 |
% |
10 |
 |
|
Ash |
641 |
% |
1 |
 |
|
Dielectric strength |
641 |
kV/mm |
10 |
 |
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Best Electrical Insulating Paper packaged in wooden crates, wooden framed cases or other strong enough materials covered with moisture-proof materialoutside.Gross weight of each package not exceeds 3000kgs.
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1,Wide range of product category
All necessary material for liquid/cast resin transformer, Motors. The thermal class covers: A, B, F, H, N.
2,Direct Trading of Various Electrical Products
All Electrical insulation material are approved by High Voltage and Low Voltage Transformer Bushing, Tap Changer, Transformer Core, DDP Paper, DDP Film, DMD prepreg materials.
3,Product quality excellence
Passed ISO9001 quality system certification and obtained a national invention patent.
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Q：Can you do our design?
A：Of course, your customized design (OEM) is available.
Q：Can you make our design for the package?
A：Yes, please send us the design you need ,we will value the price and make the exact same package basing on your design.
Q: I don't see my designed dimensions/ packaging/ delivery etc. Can you make a special order for us?
A: Sure. We're truly customized. You're free to tell us whatever you want.
Q: Do you deal with urgent orders?
A: Sure. Please contact ASAP for details.
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How to operate the transformer neutral point earthing switch?​
The switching principle is to ensure that the power grid does not lose its grounding point, and the operation method of closing first and then pulling is adopted:
a) Close the isolating switch of the backup grounding point.
b) Open the isolating switch of the working ground point.
c) Switch the zero sequence protection to the transformer with the neutral point grounded.
Why does the neutral point grounding switch of the transformer adopt the method of "first closing and then breaking"?
Answer: Because the circuit breaker on the high-voltage side of the main transformer is generally operated in separate phases. When opening and closing the circuit breaker in separate-phase operation, it is easy for the three phases to fail to close or open, which may cause zero-sequence overvoltage on the high-voltage side. , after being transmitted to the low-voltage side, it is easy to cause insulation damage to the low-voltage winding. If the grounding isolating switch is closed before operation, it can effectively limit the overvoltage and protect the insulation.
It is believed that "make first and then break" refers to the first make and then break protection, that is, if the main transformer neutral point switch is turned off, the gap protection is turned on first, and then the neutral point is turned on and then the zero sequence protection is turned off; conversely, if To close the neutral point switch of the main transformer, the zero sequence protection of the main transformer must be turned on first, and then the gap protection must be turned off after turning on the neutral point. Anyway. This is to prevent the busbar where the main transformer is located from losing grounding protection.
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