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Transformer accessories

insulation Pressboard

insulation Pressboard

Electrical paperboard is made of sulfate wood pulp with 100% purity processed by high-pressure. It has high mechanical strength, and high compatibility with the transformer oil. It is widely used on oil-immersed transformers, electric reactors, capacitors


insulation Pressboard&&Electrical Paperboard
Description:

Electrical paperboard is made of sulfate wood pulp with 100% purity processed by high-pressure. It has high mechanical strength, and high compatibility with the transformer oil. It is widely used on oil-immersed transformers, electric reactors, capacitors and switches, etc.
T4 cardboard has high density, higher tightness, lower shrinkage and good flatness. It is mainly used on equipment such as transformers, capacitors, mutual inductor, etc.( namely oil clearance pad of pie winding , partition board, cardboard tube, corrugated paper, iron yoke insulation, clip insulation, end insulation, winding plate, etc.)
Specifications: Thickness: 0.5/1/2/3/4/5mm   Long * Wide: 1000*2000    Weight for Each Package: 500Kg

Parameter:
Standard:GB/T19264.3-2003 & IEC60641-3-1992
No.   Properties Unit Electrical Paperboard(mm) T4 Paperboard(mm)
1 2 3 4 5 ≤1.6 >1.6~3.0 >3~6.0 >1.6~8.0
Index
1 Thickness & Tolerance   % ±7.5 ±5.0 ±7.5 ±5.0
2 Apparent Density g/m2 1.0~1.2 1.0~1.2 1.10~1.25 1.15~1.30 1.20~1.30
3 Moisture Content    % ≤8 ≤6.0
4 Water Extraction PH   6.5-8.5
5 Ash Content   % ≤1.0
6 Oil Absorbency % ≥10 ≥9
7 Contamination to Transformer Oil   No Contamination
8 Tensile Strength MD N/10mm ≥110 ≥105
CD ≥80 ≥85 ≥80 ≥80
9 Elongation MD % ≥7.0 ≥3.0
CD ≥9.0 ≥4.0
10 Shrinkage
 
MD % ≤0.7 ≤0.5
CD ≤1.0 ≤0.7
Thickness ≤5.0 ≤5.0
11 Electric Strength In the Air   KV/mm ≥10 ≥11
In the Oil ≥40 ≥30 ≥25 ≥40 ≥35 ≥35

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