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Insulation Paper DDP

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Product Class：OIL TYPE TRANASFORMER INSULATION SYSTEM

Insulation Paper (DDP is made by coating special modified epoxy resion on the high-performance insulating paper.It is widely applied in inter-layer insulation and turn insulation of oil-immersed power transformers. During application, the coated layer starts to melt under certain temperature in the process of coil drying and results in adhesion effect. As temperature rises, it starts to solidify and make coils’ adjacent layers reliably bond into a fixed unit.

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Product Description

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Insulation Paper DDP is made by coating special modified epoxy resion on the high-performance insulating paper.It is widely applied in inter-layer insulation and turn insulation of oil-immersed power transformers. During application, the coated layer starts to melt under certain temperature in the process of coil drying and results in adhesion effect. As temperature rises, it starts to solidify and make coils’ adjacent layers reliably bond into a fixed unit. The adhesive strength of epoxy resin is strong enough to prevent the displacement of coil layers in case of short-circuit, so as to ensure the long-term mechanical and electrical performance of insulation structure.
As the resin coat of diamond pattern adhesive insulating paper is dot shaped, the paper ensures oil immersion and the discharge of gas from insulation materials, effectively prevents electric corona and partial discharge, thus ensuring the safety and reliability of insulation structure.
Product Solidification Conditions:
First keep 90℃±5℃ for three hours, and then rise temperature to temperature rises to 125℃±5℃,the product will completely solidifies after maintaining for six hours.
Storage:
Store in a dry and clean room, and keep away from fire and heat point, also keep away from the sun. The storage period is one year, qualified products exceeding the storage period can still be used.

No.	Performance		Unit	Requirement
1	Base material thickness and tolerance		mm	0.08±0.005	0.13±0.007	0.18±0.010	0.20±0.010	0.25±0.010
2	Base material tightness		g/cm³	0.85-1.10
3	Single-sided adhesive thickness		um	6-12
4	Moisture		%	4.0-8.0
5	Ash		%	≤1.0
6	Conductivity of water extract		ms/m	≤10
7	PH value of water extract		-	6.5-8.5
8	Oil absorption		%	≥20
9	Adhesive strength	Normal state	kpa	≥650 ≥400
		100℃±2℃
10	Contamination of transformer oil		-	No pollution（tanδ<0.001）
11	Tensile strength	MD	N/10mm	≥60 ≥30	≥110 ≥50	≥160 ≥70	≥180 ≥80	≥230 ≥100
		CD
12	Tear strength	MD	mN	≥450	≥900	≥1350	≥1500	≥2000
		CD		≥500	≥1000	≥1500	≥1700	≥2300
13	Breakdown Voltage	In air	kv	≥0.88	≥1.37	≥2.00	≥2.10	≥225
		In oil		≥4.40	≥7.00	≥9.00	≥9.80	≥11.50