Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer

Description of Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer: The Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer is made of high-quality birch by cooking, rotary cutting and drying, coated wit……

Description of Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer:
The Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer is made of high-quality birch by cooking, rotary cutting and drying, coated with special insulating glue, and made by high temperature and high pressure. Electrical laminated wood is used for insulating and supporting parts in transformers, and for pressing plates and clamps of coils.

Characteristic of Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer:
It has the characteristics of good insulation, high mechanical strength and easy machining.
Processing Technology of Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer:
Qualified base material – primary soaking – secondary soaking – rotary cutting – veneer drying – veneer cutting and repairing –
gluing and blank assembling – pre pressing – hot pressing. (low medium adhesive and several layers of veneer are used, each
layer of veneer is 1.2-2.2mm thick, and the wood grain is crisscross, crisscross and parallel to form the blank, which is
pressed under high pressure.)
Application of of Electrical Insulation Birch Plywood Laminated Wood Boards for Transformer:
It is widely used in insulation and support materials of transformer and transformer. Its dielectric constant is close to that
of transformer oil, and its insulation coordination is reasonable. It can be used for a long time in 105 ℃ transformer. Under
the action of external force and strong electric field, it will not break or be broken down. At present, electrical laminated
wood materials have been widely used at home and abroad to make insulating structural parts, such as: upper and lower pressing
plates, lead brackets, yoke pads, coil insulation pressing plates, yoke clamps, etc. It is used to make clamps in the
transformer instead of steel plate, insulating board and epoxy board, so as to reduce the dead weight and material cost of the
transformer.

Standards:  GB/T 20634.3-2008 /IEC61061-2:1998
NO. Properties Unit Index
DLW101 DLW201 DLW202 DLW301
1 Appearance Smooth Surface, Neat Edge Cutting, No Layered Cross-section
2 Density g/cm³ 1.2-1.3 1.1-1.2 1.1-1.2 1.0-1.1
3 Vertical  Bending Strength A Direction MPa ≥80 ≥65 ≥65 ≥55
B Direction ≥80 ≥65 ≥65 ≥55
4 Impact Strength A Direction KJ/m2 ≥15 ≥13 ≥13 ≥10
B Direction ≥15 ≥13 ≥13 ≥10
5 Interlaminar

Shear Strength

MPa ≥9 ≥8 ≥8 ≥7
6 Vertical Electrical Strength

(90℃ transformer oil)

Kv/mm ≥9 ≥8 ≥7 ≥7
7 Parallel Breakdown Voltage

(90℃ transformer oil)

kv ≥50 ≥50 ≥50 ≥50
8 Contamination to Liquid Dielectric ≤0.1
9 Shrinkage after Drying A Direction ≤0.3 ≤0.3 ≤0.3 ≤0.3
B Direction ≤0.3 ≤0.3 ≤0.3 ≤0.3
Thickness Direction ≤3 ≤3 ≤3 ≤3
10 Water Content ≤6 ≤6 ≤6 ≤6
11 Oil Absorption ≥5 ≥8 ≥8 ≥10
Application Scope of Laminated Wood Insulating Parts used for Transformer Transformer Rating ≤110KV ≥110KV 66-35KV ≥ 35KV

 

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