CN2041065U - Electrical plywood with low dielectric constant - Google Patents

Abstract

The utility model is discloses an electrical plywood with low dielectric constant and is suitable for an oil-filled transformer and the insulated constructional piece of a transformer. The adhesive of a low dielectric loss angle and a low dielectric constant is spread onto a plurality of neutrality wood sheets. The wood sheet is made by the fold of the transverse and lengthways tree grains. The utility model has the advantages of low cost and high mechanical strength. And the dielectric permittivity is same with the dielectric permittivity of the transformer oil.

Description

Electrical plywood with low dielectric constant

The utility model is a kind of electrical laminated wood, mainly is applicable to the insulation system spare of doing oil-filled transformer and oil immersed type instrument transformer.

At present, domestic also do not have an oil-filled transformer of being applicable to, the electrical laminated wood of instrument transformer, just with some high-quality timber for usefulness, its timber is tied if any tree and just can not be used, so lumber recovery is very low, causes the wood material significant wastage.

The purpose of this utility model provides that a kind of cost is low, and dielectric constant is low, the electrical laminated wood that mechanical strength is high.

The utility model is realized with following technical scheme: select for use neutral timber to be peeled into thin plate about 2～4mm earlier.After the section, coat low dielectric loss angle and the repressed electrical laminated wood that forms of low-k glue, adopt mutual flanging bridging arrangement between every layer of thin plate and the thin plate, and thin plate do not allow to exist the tree knot, thin plate is if there is the tree knot, mends after tree knot part is scratched to connect.Electrical laminated timber structure will adopt the tree line in any case to replace stacked compacting.

It is low to the utlity model has dielectric constant, and its dielectric constant is 2.1～2.3, matches the mechanical strength height with the dielectric constant of transformer oil.The characteristics that cost is low.

Now in conjunction with the accompanying drawings the utility model is described in further detail.

Fig. 1 is that the utility model master looks cut-away view.

Fig. 2 is the utility model part sectioned view.

Fig. 1～2nd, the utility model specific embodiment: the suitable quarrel thin plate 1 that will be peeled into the thick neutral timber of 2～4mm, coat low dielectric loss angle and low-k glue 2 with horizontal quarrel thin plate 4, will in any case replace stacked compacting by its tree line of several layers thin plate and form, the joint 3 of veneer adopts mutual flanging structure.And veneer 1 does not have and sets knot, as meets the tree knot, will set to mend after knot is partly removed to connect.

The used binding agent of bonding the utility model is a kind of special binding agent. Its composition is epoxy resin 10～25% phenolic aldehyde 60～85%, acetal 5～15%. Its glue-spread must not exceed 8～15% ratio when making the utility model.

The utlity model has that cost is low, dielectric constant is low. The utility model dielectric constant is 2.1～2.3, and the mechanical strength height, can make oil-filled transformer, and the dielectric level of transformer is greatly improved, and product cost reduces greatly, only is about 25% of former cost, produces huge economic benefit with being bound to.

Claims (1)

1, a kind of electrical laminated wood, it is characterized in that scribbling the thick neutral timber of the several layers 2～4mm of low dielectric loss angle and low-k binding agent 2 along quarrel thin plate 1 and horizontal quarrel thin plate 4, the flanging overlap joint is wanted in the junction 3 of every layer of veneer, and the tree line in any case replaces stacked compacting and forms.

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