Name: Diamond dotted insulation paper DDP for oil immersed transformer
Brand: Rizhi
Availability: InStock

Product Details

Diamond dotted insulation paper(DDP)

Diamond dotted insulation paper (DDP) is made by coating special modified epoxy resion on the high-performance and low dielectric loss 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 curing under temperature 90℃±5℃ for 3 hours, and then rise temperature to 125℃±5℃ and keep 6 hours to cure;curing in accordance with the privision of both parties is also available.

Storage
Store in a dry,clean and well-ventilated warehouse, 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.

Specification

No.	Property		Unit	Requirements
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	0.38±0.020	0.50±0.030
2	Base material tightness		g/cm³	0.85~1.10
3	Single-sided adhesive thickness		um	5~15
4	Moisture		%	4.0~8.0
5	Ash contant		%	≤1.0
6	Conductivity of water extract		mS/m	≤10
7	PH value of water extract		-	6.5~8.5
8	Oil absorbtion		%	≥20
9	Bonding strength	Normal	kPa	≥650
		100℃±2℃		≥400
10	Contamination of transformer oil		-	No pollution（tanδ<0.001）
11	Tensile strength	MD	N/10mmWidth	≥60	≥110	≥160	≥180	≥230	≥250	≥300
		CD		≥20	≥35	≥55	≥60	≥70	≥120	≥150
12	Tear strength	MD	mN	≥450	≥900	≥1350	≥1500	≥2000	≥3500	≥5000
		CD		≥500	≥1000	≥1500	≥1700	≥2300	≥4000	≥6000
13	Breakdown Voltage	In air	kV	≥0.88	≥1.37	≥2.00	≥2.10	≥2.25	≥3.00	≥4.00
		In oil		≥4.40	≥7.00	≥9.00	≥9.80	≥11.5	≥15.00	≥20.00