Wood Step Block

This wood step block is mainly used for producing transformers. It can be used in transformer oil with 105℃ for a long time.

Features:

This wood step block is mainly used for producing transformers. It can be used in transformer oil with 105℃ for a long time.

Raw material technical data

Item	Index		Unit	Index data
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
	Tensile strength	Parallel direction	Mpa	≥50
	Compressive strength	Parallel direction	Mpa	≥50
	Compressive strength	Vertical direction	Mpa	≥120
	Bending strength	Parallel direction	Mpa	≥100
	Bending strength	Vertical direction	Mpa	≥100
Electrical property	Volume resistivity		MΩ/m	≥ 10a
	Electrical strength (50Hz)	20℃ Transformer (Vertical)	Mv/m	≥9
		90℃ Transformer (Vertical)	Mv/m	≥7
		20℃ Transformer (Parallel)	Kv/m	≥45
		90℃ Transformer	Kv/m	≥35
	Dielectric loss factor (tg δ) (50Hz)	20℃ Transformer oil		≤0.2
	Dielectric loss factor (tg δ) (50Hz)	90℃ Transformer oil		≤0.13
	Relative dielectric constant (∑ n)	20℃ Transformer oil		≤3
	Relative dielectric constant (∑ n)	90℃ Transformer oil		≤3.6