Electrical Laminated Wood

Electrical Laminated Wood for Transformer Description: Spinning cutting from excellent birch into veneer sheets, drying, coating resin, then laminating and hot pressing. Characteristics: proper specific weight, high mechanical strength, good compatibility with transformer oil and easy machining. In addition, its dielectric constant is close to that of transformer oil and the insulation coordination between them is proper. It can be used in transformer oil with 105℃ for a long time. Application: It is widely used in manufacturing some devices for oil-immersed  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
Parameter

Project

Unit

Index

DLW101

DLW201

DLW202

DLW301

Appearance

-

Smooth surface, uniform color, no bubbles, no wrinkles, edge cutting neat, no stratification.

Density

g/m³

1.2-1.3

1.1-1.2

1.1-1.2

1.0-1.1

Vertical layer bending strength

A direction

MPa

≥80

≥65

≥65

≥55

B direction

≥80

≥65

≥65

≥55

Impact strength

A direction

KJ/m2

≥15

≥13

≥13

≥10

B direction

≥15

≥13

≥13

≥10

 Interlaminar shear strength

MPa

≥9

≥8

≥8

≥7

Vertical layer electrical strength (in 90℃ transformer oil)

Kv/mm

≥9

≥8

≥7

≥7

Parallel layer break down voltage(in 90℃ transformer oil)

kv

≥50

≥50

≥50

≥50

Pollution for liquid dielectric electricity

-

≤0.1

Shrinking after dried

A direction

≤0.3

≤0.3

≤0.3

≤0.3

B direction

≤0.3

≤0.3

≤0.3

≤0.3

Vertical direction

≤3

≤3

≤3

≤3

Water content

≤6

≤6

≤6

≤6

Oil absorbing

≥5

≥8

≥8

≥10

Transformer  grade No less than 110KV No higher tan 110KV

66-35KV

No higher than 35KV
Note: Due to continuous product improvement, the dimensions provided in this sample are for reference only. If necessary, our company can design and produce according to user requirements. Please contact the company in time.