DDP Diamond Dotted Paper For Oil-Immersed Transformer

Short Description:

Merrill Diamond Dotted Insulation Paper is one of the insulating materials, which is made of electrical kraft paper coated on one or both sides with modified B-stage heat curable epoxy resin in diamond-shaped form and then dried. It features higher electrical strength and mechanical property. And In the process of coil drying, the agglutinating and solidifying of DDP can bond the coil into a fixed unit.

The diamond patterns of epoxy resin are of size 9.5mm x 9.5mm with 15.9mm center spacing.

The advantage of partially coated insulation press paper lies in the internal strengthening of the coil from adhesion to the conductor, which provides passage for quick evacuation of air and moisture during the drying process. It also minimizes the risk of partial discharge, quick impregnation, and flow of oil through the channels. The bonding strength of the epoxy resin is sufficient to prevent displacement of winding layers due to short circuit forces.

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DDP Diamond Dotted Paper For Oil-Immersed Transformer

Đặc điểm

1. Insulation class A (105 °C) according to IEC 641

2. Width: 960mm or customization

3. Thickness: 0.08mm,0.13mm,0.18mm,0.20mm,0.25mm or customization

4. Electrical insulation paper,100% sulphate pulp

5. High purity and mechanical strength

6. Backed enamel coating: Epoxy resin, rhombic,one or both sides

7. Good compatibility with liquid dielectic after the baked enamel coating has hardened.

8. Care should be taken that the layers to be baked remain closely pressed against each other during baking

9. It has been approved by UL (NO.: E310670) ,ROHS and REACH test.

Product		thickness	0.08mm	0.13mm	0.18mm	0.2mm	0.25mm
Thickness & Tolerance		mm	0.080 ±0.005	0.130 ±0.007	0.180 ±0.010	0.2	0.250 ±0.010
						±0.010
Density		g/m2	0.85-1.1
Moisture Content		%	4.0-8.0
Water Extraction PH		–	6.5-8.5
Ash Content		%	≤1.0
Adhesive Thickness		µm	6-12
Oil Absorbency		%	≥20
Contamination to Transformer Oil		–	No Contamination
Bond Strength	Normal	KPa	≥650
	100℃±2℃		≥400
Tensile Strength	MD	N/10mm	≥60	≥110	≥160	≥180	≥230
	CD		≥30	≥50	≥70	≥80	≥100
Elongation	MD	%	≥2.0
	CD		≥4.0
Tear Strength	MD	MN	≥450	≥900	≥1350	≥1500	≥2000
	CD		≥500	≥1000	≥1500	≥1700	≥2300
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