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Oil Transformer Use Electrical Insulation Material High Density Compressed Wood

Electrical laminated wood sheet is widely used into manufacturing some devices for oil-filled transformer, such as upper and lower pressure plate, lead bracket and iron yoke cushion block.

 


Introduction:

Electrical laminated wood sheet is widely used into manufacturing some devices for oil-filled transformer, such as upper and lower pressure plate, lead bracket and iron yoke cushion block. And it is used to make clamping device in mutual inductor. It can replace steel plate, insulation paper board, epoxy paper board and epoxy fiberglass board, which can lower the weight of the transformer and the cost of materials.

Advantages:

1. Proper specific weight

2. High mechanical strength,

3. Good compatibility with transformer oil

4. Easy machining 

      

      

Item 

Unit 

Index 

Physical

Property

Density 

t/m3

0.9~1.1

Rate of water content 

%

≤ 7

Thickness shrinkage ratio after drying

≤ 1.5

Oil absorption rate

> 10

 Ultimate thickness expansion rate after oil impregnation

≤ 0.5

 Compatibility with transformer oil  

Good

Mechanical

Property 

 Tensile strength 

(Parallel direction)

Mpa

≥ 50

 Compressive strength

(Parallel direction)

≥ 50

(Vertical direction)

≥ 120

 Bending strength 

(Parallel direction)

≥ 100

(Vertical direction)

≥ 100

 Modulus of elasticity 

(Parallel direction)

≥ 7000

Electrical

Property 

 Volume resistivity 

MΩ/m

≥ 10a

 Electrical strength (50Hz)

20℃ Transformer (Vertical)

MV/ m

≥ 9

90℃ Transformer (Vertical)

≥ 7

20℃ Transformer (Parallel)

KV/m

≥ 45

90℃ Transformer (Parallel))

≥ 35

Dielectric loss factor (tg δ) (50Hz)  

20℃ Transformer Oil      

 

≤ 0.02

 90℃ Transformer Oil

 

≤ 0.13

Relative dielectric constant (∑ n) 

 20℃ Transformer Oil

 

≤ 3

 90℃ Transformer Oil

 

≤ 3.6

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