Diamond Dotted Presspaper/DDP/Isolation Paper for Transformer

• Application: Insulators, Electrical Winding Insulation, Winding Wire Coating Insulation, Electrical Base, Shell, Motor, Insulating Varnish, Oil Immersed Transformers
• Type: Insulation Paper
• Chemistry: Organic Insulation
• Material: Insulation Paper and Resin
• Thermal Rating: A 105
• Maximum Voltage: 20KV~100KV
• Model NO.: DDP paper Diamond Dotted Paper
• Classification: Organic Insulating Material
• Certification: ISO9001
• Color: Brown
• Brand: Xincheng
• Product Name: Diamond Dotted DDP Electrical Insulating Paper
• Usage: Electrical Insulation for Transformer
• Model Number: DDP, Cable Paper, Kraft Coated with Heat
• Ash Content: ≤0.7%
• Temp.Class: a Class
• Thickness: 0.08;0.13;0.18;0.20;0.25mm, 0.38mm, 0.5mm, etc
• Tear Strength, Cross Machine Direction: ≥5500mn
• Edge Internal Tearing Resistance N: ≥115n
• Transport Package: Pallet
• Specification: ROLL
• Trademark: XINCHENG
• Origin: China
• HS Code: 4811490000
• Production Capacity: 5000t/Year

Product Description

Quick Details 
Place of Origin: China (Mainland)                                                   Brand Name: XINCHENG
Application: Oil immersed transformers                                          Product name: Diamond dotted DDP electrical insulating paper
Edge Internal tearing resistance N : ≥115N                                    Tear strength, Machine direction: ≥4000mN
Tear strength, Cross machine direction: ≥5500mN                        Dielectric breakdown(volts/layer ,dry test):≥:2100
Bonding strength: >500Kpa                                                            Model Number: DDP, cable paper, Kraft coated with heat
Type: Insulation Paper, insulation paper DDP diamond dotted paper          Material: Wood pulp
Material: Insulation paper and resin                                                              Rated Voltage: 6~24KV/Layer
Standard color: Natural                                                                                Temperature: 105-120°C
Thickness: 0.08;0.13;0.18;0.20;0.25mm,0.38mm,0.5mm,etc                      Double side: available
Sample: Sample Available                                                                            Width: 20-1900mm
Ash content: ≤0.7%
 
 
1.Product Description
Diamond dotted paper(DDP) is made of insulating paper with diamond-shape epoxy resin dotted on both sides. The epoxy used in D.D.P contains a kind of incubative hardener material. It is a dry and crisp material at normal temperature.
This product has good dielectric properties and good mechanical properties after heat solidification. It is to be used in oil-immersed transformers for the insulation between of coils and between layers of oil immerged power distribution transformers.
Diamond pattern paper made of Kraft paper coated with heat curable epoxy resin.The epoxy adhesive is applied to both sides of the paper in a diamond pattern consisting of 9.5mm x9.5mm diamonds with 15.9mm center spacing.
Properties
It is a kind of material with inertia, dry and no conglutination at normal temperature (below 30ºC). The Diamond Dotted Paper (DDP)will make the electric conductor forever felt up as a hard unit under the high temperature by its internal latency substance. When the temperature is rising up to 90ºC, The Diamond Pattern Paper (DDP)begins one-off thaw and then one-off solidification. When to keep the temperature at 90ºC for 90 minutes, the epoxy resin would paste on neighboring cable and paper safely. The felt intensity is as high as to 70psl at 100ºC.(The value at least is equal to 0.450Mpa) (IEC standard)
Applications
This product has good dielectric properties and good mechanical properties after heat solidification. It is to be used in oil-immersed transformers for the insulation between of coils and between layers of oil immerged power distribution transformers.
The Diamond Dotted Paper to be used in oil immersed transformers, for coil insulation. On the insulation layer, there is a layer dotted epoxy resin that will be changed with high temperature change that is to be called as felt. It is suitable for turn-to-turn insulation of coil wires on oil-immersed power transformers and suitable for layer insulation of coils on distribution transformers.
 
 
Specifications:
1).Density : 0.85~1.10 g/cm3
2). Width: 800mm, 960mm, 1000mm, 1050mm, 1200mm, 1300mm,1900mm or customized.
3).Thickness:0.08mm, 0.13mm, 0.18mm, 0.25mm, 0.38mm, 0.50mm or customized.
4). good dielectric properties and good mechanical properties after heat solidification
5). Color: nature, brown  
Advantage: 
It is to be used in oil-immersed transformers for the insulation between coils. On the insulation layer, there is a layer dotted epoxy resin that will be changed with high temperature change that is to be called as felt.
      In the process of coil desiccation, the coated epoxy-resin would be melted in a certain temperature and become adhesive. With the temperature increased, the melted resin would cure to C-stage, and firmly adhere each adjoining layer of the coil, thus forming a winding section. If a short circuit occurs in the coil, the resin bond strength would sufficiently prevent the displacement of each winding layer, which ensures the long-term mechanical and physical properties of the insulation structure. As the resin coating distributes in a diamond-dotted pattern, little quantity of the resin would soak into the insulating paper during the melting and curing process, which ensures the elimination of air content in the insulating paper and guarantees the soakage of oil, minimizing the damages of corona and partial discharge.
Features

• Insulation class A (105 °C) according to according to IEC 641
• Kraft paper, 100% sulphate pulp
• High purity and mechanical strength
• Color natural
• Baked enamel coating: Epoxy resin , rhombic, one or both sides
• Good compatibility with liquid dielectic after the baked enamel coating has hardened.
• Care should be taken that the that the layers to be baked remain closely pressed against each other during baking time

 

 
 



  
Main Specification

Properties		Values
Thickness	Inch	0.003	0.005	0.007	0.010	0.015	0.020
	mm	0.08	0.13	0.18	0.25	0.38	0.50
Thickness tolerance		±10%
Apparent density: g/cm^3		0.9~1.1, all thicknesses
Moisture content		4.0% ~ 8.0%, all thicknesses
PH water extract		6.0 ~ 8.0, all thicknesses
Ash content		0.7% maximum
Elongation	MD	2%
	TD	4%
No-pollution oil of transformer		Non-pollution
Coating thickness per side		0.006mm to 0.012mm
Tear strength	MD	55	100	140	220	410	440
	TD	70	145	210	370	600	700
Tensile strength, Mpa	MD	70	70	80	80	80	80
	TD	35	35	35	35	35	35
Mullen burst strength, min(Psi)		40	65	90	150	200	300
Dielectric breakdown (KV/layer)	Dry Test	0.75	1.10	1.40	2.10	2.90	3.10
	Oil Test	5.5	8.5	10.5	14.0	20.0	23.5
Bonding strength		Minimum 40 psi shear strength, tested at 100 degrees 450kpa.

 
DDP Technical Data

ITEM

Property

Unit

Index

1

Thickness and Tolerance

mm

0.08 ±0.005

0.13 ±0.007

0.18 ±0.01

0.20 ±0.01

0.25 ±0.01

0.30 ±0.01

0.35 ±0.02

0.38 ±0.02

0.45 ±0.02

0.50 ±0.03

2

Density

g/cm³

0.85~1.10

3

One Side Coating

µm

6~12

10~15

4

Moisture Content

%

4.0~8.0

5

Ash Content

%

≤0.7

6

Water Extraction of Electrical Conductivity

mS/m

≤8

7

PH Water Extract

6.5~8.5

8

Oil Absorption

%

≥20

9

Bond Strength

Kpa

≥650

10

Tensile Strength

TD

N/10mm

60

110

160

180

230

≥250

MD

30

50

70

80

100

≥120

11

BDV

KV

0.88

1.37

2.00

2.10

2.25

≥2.50

 
 



 
2 Curing conduction stock
2.1 Curing: 90°C±2 °C/3h firstly , then130°C±5°C/6h, or according customer needs
2.2 Storage: ≤40°C,dry, clean in warehouse. Avoid fire, heat and sunlight.
2.3 Storage life: 12 months. Still effective if qualified in retest after 12 months.
 
FAQ
Q: how to contact with sales ?
A:you can send inquiry of our products,it will be replied within 12 hours;
you can contact dirrectly with our sales through phone or WhatsApp, Skype,E-mail as you like
 Q:how about certificate ?
A:professional certificate, if you want to do certification, pls feel free to tell us, we will consider to make it as fact.
 Q:what about the samples delivery?
A:As our company rules, we usually provide sample before you decide to place an order. Stock sample will be delivered within 5 days. Proofing will depend on the actual situation,
 Q:what about the samples fee?
A: some samples are free, you just need to pay for the freight fee;
we will charge some fee if proof produced. Later if an order placed, the sample fee is refundable.
 
 
Packaging & Delivery
Packaging Details:
1. Roll packing in requested meter, protected by PP bag and carton, put on fumigation-free pallets, wrapped with shirinking film, finally palletized. 
2. According to customer's requirement. 
Delivery Time: 10 days after payment
 
Our Services
 1) if you are interested in our products, you can get contact with us through online tools or email as you like, inquiry is warmly welcomed from you
2) your inquiry or email will be positively replied within 12 hours
3) we provide OEM/ODM service on insulation material, we can make sure of the quality, our QC will submit inspection report before shipment
4) economical and fast delivery
5) professional after-sale service
 
 
 
Please Contact Us
 Miss: lydia
Mob: [phone]      Fax: [phone]        
http://chinainsulation.en.made-in-china.com