Electrical Laminated Wood Board

一、Electrical Laminated Wood Board

Electrical laminated wood is widely used as insulation and supporting material in transformers and instrument transformers. It has many merits such as high mechanical strength, high compatibility with transformer oil, etc. And it can be used in 105℃ transformer oil for a long time.

People usually use this material to make pressure plates,spacer blocks in oil immersed transformers,as well as clamps in instrument transformers. It can replace steel plate, insulating paper sheets, epoxy paper sheets, epoxy paperboard woven glass fabric lamination in these fields. Thus, the weight of transformer and the cost of materials are reduced.

The raw materials of electrical laminated wood is the thin veneer of beech and birch, stained wood,northeast China ash and other high quality wood. The product is coated with special insulating glue and processed at high temperature and high pressure conditions.

二、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

三、 Appearance Quality

ltem	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

Test Report Of Electrical Laminated Wood By Third Party

TechnIcAL DATA	Designation	Kangliyuan		P-0.9	P-1.1	P-1.3	P-1.4	+0.9	+1.1	+1.2	+1.3	X-1.1	X—1.2
		gB/T20634		PIB	P2B	P4B	/	c1B	c2B	c4B	/	T2B	T4B
		Iec 61061		PIR	P2R	P4R	PFWV202	cIR	c2R	c4R	PFWV304	T2R	T4R
		DIn7707		KP20210	KP20212	KP20214	KP20218	KP20220	KP20222	KP20224	KP20228	KP20242	KP20244
	Standard	unit
PhySIcAL PROPeRTIeS
DenSITy	Iec61061	g/cm3		0.7—0.9	0.9—1.1	1.2—1.3	1.3—1.4	0.7—0.9	0.9—1.1	1.2—1.3	1.3—1.4	0.9—1.1	1.2—1.3
OIL ABSORPTIOn	Iec61061	%		32	30	7	/	30	28	10	/	28	7.5
cOnTInuOuS WORKIng TeMPeRATuRe		℃		105	105	105	100	105	105	105	100	105	105
TeMPeRATuRe LIMIT FOR DRyIng PROceSS		℃		140	140	140	130	140	140	140	130	140	140
cOnTAMInATIOn OF DIeLecTRIc LIQuIDS	Iec61061	Δtg δ		﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1	﹤ 0.1
MechAnIcAL PROPeRTIeS
FLeXuRAL STRengTh 1)	Iec61061 unI en ISO 178	MPa		145	150	200	220	120	130	140	150	135	160
MODuLuS OF eLASTIcITy In FLeXuRe	Iec61061 unIen SO 178	gPa		10	14	16	18	7.5	9.5	12	15	11	13
cOMPReSSIVe ⊥ STRengTh ≡	Iec61061 unI en ISO 604	MPa		120	130	145	170	150	210	245	240	140	160
cOMPReSSIVe ⊥ STRengTh ≡	Iec61061 unI en ISO 604	MPa		95	95	130	160	60	75	110	170	/	/
eLecTRIcAL PROPeRTIeS
eLecTRIc STRengTh	Iec 61061 Iec 60243	kV/mm	/	15	16	18	7	15	16	18	7	16	18
			F	16	17	19	8	16	17	19	8	17	19
			O	17	18	20	9	17	18	20	9	18
BReAKDOWn VOLTAge	Iec 61061 Iec 60243	kV/25mm		>80	>80	>80	>80	>80	>80	>80	>80	>80	>80
SuRFAce ReSISTIVITy	Iec60093	Ω		1012	1012	1012	1011	1012	1012	1012	1011	1012	1012
VOLuMe ReSISTAnce	Iec60093	Ω cm		1012	1012	1012	1011	1012	1012	1012	1011	1012	1012
DISSIPATIOn FAcTOR	Iec60250	tg δ		0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
ReLATIVe PeRMITTIVITy	Iec60250	ε r		3.3	3.5	3.8	4.2	3.3	3.5	3.8	4.2	3.5	3.8

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