Oil-immersed transformer-diamond dotted paper

ztelec-www.electrical-insulating-material.com2024-10-18 11:235300

Oil-immersed transformer-diamond dotted paper

Diamond dotted paper is commonly known as dotted paper. It is an insulating material that coats special modified epoxy resin in a diamond shape on electrical insulating paper.

Application and principle of diamond dotted paper

It is widely used in interlayer insulation and turn insulation of oil-immersed power transformers. When used, the coating begins to melt at a certain temperature during the drying process of the coil, producing an adhesion effect. As the temperature rises, it begins to solidify again, so that the adjacent layers of the winding are reliably bonded into a fixed unit. The bonding strength of epoxy resin is sufficient to prevent the displacement of the layers of the winding during a short circuit, thereby ensuring the long-term mechanical and electrical properties of the insulation structure.

Because the resin coating of the diamond dotted paper is in the shape of dots, it ensures the immersion of oil and the discharge of gas in the insulating material, effectively avoiding corona and partial discharge, thereby ensuring the safety and reliability of the insulation structure.

Performance data sheet

Standard: JB / T1004.3-2004
No.	Properties		Unit	0.08	0.13		0.18	0.20	0.25
				Index
1	Thickness & Tolerance		mm	0.080±0.005	0.130±0.007		0.180±0.010	0.200±0.010	0.250±0.010
2	Density		g/m2	0.85-1.1
3	Moisture Content		%	4.0-8.0
4	Water Extraction PH		—	6.5-8.5
5	Ash Content		%	≤1.0
6	One Side Adhesive Thickness		µm	6-12
7	Oil Absorbency		%	≥20
8	Contamination to Transformer Oil		—	No Contamination
9	Bond Strength	Normal	KPa	≥650
		100℃±2℃		≥400
10	Tensile Strength	MD	N/10mm	≥60	≥110	≥160		≥180	≥230
		CD		≥30	≥50	≥70		≥80	≥100
11	Elongation	MD	%	≥2.0
		CD		≥4.0
12	Tear Strength	MD	MN	≥450	≥900	≥1350		≥1500	≥2000
		CD		≥500	≥1000	≥1500		≥1700	≥2300
13	Breakdown Voltage	In the air	KV	≥0.8	≥1.37	≥2.00		≥2.10	≥2.25
		In the oil		≥4.00	≥7.00	≥9.00		≥9.80	≥11.50

ZTelec Group is a professional manufacturer of transformer insulation materials with more than 60 years of manufacturing experience. If you need more Oil-immersed transformer diamond dotted paper product information and quotes, please contact us.