China High densified electrical Laminated Wood for oil transformer insulation Manufacturer and Supplier

High densified electrical Laminated Wood for oil transformer insulation

Short Description:

Electrical laminated wood is widely used as insulation and supporting materials in transformers and instrument transformers. It has many virtues such as moderate specific gravity, high mechanical properties, easy vacuum drying, no bad inner-reaction with transformer oil, easy mechanical processing, etc. The dielectric constant of this material is close to transformer oil, so it makes a reasonable insulation match. And it can be used in the transformer oil of 105℃ for a long time.People usually use this material to make upper/lower pressure pieces, cable supporting beams, limbs, spacer blocks in oil-immersed transformers, and clamps in instrument transformers. It replaced steel plates, insulating paper sheets, epoxy paper sheets, epoxide woven glass fabric lamination in these fields, and cut down the material expenses and weight of transformers.

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Products details:

Insulation board is manufactured in accordance to IEC standards, in a single sheet and in a thickness of up to 8 mm. The thickness range can be extended up to 150 mm by Transformer laminations.

The raw materials of laminated wood sheets are high-quality birch and willow timbers. After boiling, rotary cutting, drying, these timbers are made to veneers. At last, the veneers will be glued with special insulating gluewater and processed under high temperature and pressure.

Veneer Face Flatness(unit mm)

Normal Thickness	Distance of any point on the upper surface of the veneer that deviates from the light weight straight ruler
Normal Thickness	Veneer length 500	Veneer length 1000
≤15	2.0	4.0
＞15..≤25	1.5	3.0
＞25..≤60	1.0	2.0
＞60	1.0	1.5

Appearance Quality

Item	Allowed Range
Swelling	Not Allowed
Cracking
Dead Knot
Foreign-body Adhering
Insect Hole
Rot
Contamination
Bruising	A few allowed, not effect in usage
Impression
Color-odds and splash
Patches per sq.m on surface	≤3

GB Test Item— Before delivery Factory inspection

Test Item		Unit	Standard	Test Method
Vertical Bending Strength	Toward A	Mpa	≥65	GB/T2634—2008 Test Standard
	Toward B		≥65
Vertical Bending modulus of elasticity	Toward A	Gpa	≥8
	Toward B		≥8
Compressibility (under 20MPa)	Toward C	%	≤3
	Crev		≥70
Impact strength (side test)	Toward A	KJ/㎡	≥13
	Toward B		≥13
Interlaminar shear strength		Mpa	≥8
Vertical electric strength (90 ℃ + 2 ℃)		KV/mm	≥11
Vertical electric strength (90 ℃ + 2 ℃)		KV	≥50
Performance density		g/cm³	>1.1~1.2
water content		%	≤6
Shrinkage after drying	Toward A	%	≤0.3
	Toward B		≤0.3
	Toward thickness		≤3
Oil absorption		%	≥8