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Diamond pattern resin coated paper (DPRCP) is new insulating materials for transformers£®Diamond pattern epoxy resin coated electrical consists of high strangth insulating paper£®
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| ¡¡ The diamond pattern-resin coating melts at baking temperatures and fuses together the layers of paper and conductors,forming a rigid bond£®Prolonged heating of the coil during the normal baking cycle cures (or cross-links) the resin thus in suring permanent resistance to internal heat and forces for the lifetime of transformer£®Coils made with DPRCP are able to withstand axial short circuit forces far better than coils made with uncoated papers£® |
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| ¡¡ Because the shape of resin coat assumes point not covering all surfsce the passages without coat are best useful to degas insulating materials and intrude liquid or gas insulating materials£® |
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| ¡¡ Moreover , the DPRCP help minimize corona failure is caused by a spark discharge through air intrapped between layers of insulating or within the insulating itself£®The dimond pattern coating (as opposed to solid coating ) combines strong bonds with channels through which air is evacuated prior to oil filling This reduces gas pockets in the coil£¬and practically eliminates corona failure in service£® |
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| DPRCP has already been widely used in electrical equipments such as mutual inductance machine£¬transformer and etc£¬as layers insulating materials£® |
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| 1.Classification |
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| 1.1Specification |
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| 1.1.1Thickness: |
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| 0.08¡¢0.13¡¢0.17¡¢0.20¡¢0.25mm |
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| 1.1.2 Width: |
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| 625mm¡¢960mm¡¢1020mm ¡¡¡¡ |
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1.1.3 Fig£®1 shows resin coat¡¯s dimension and arrangment: |
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| 1.2 Mark: |
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| Diamond pattern resin coated paper ¨C DPRCP |
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| 2 Technical requirments |
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| 2.1 Exterior quality |
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| No defects such as wrinkle£¬pinhole£¬grains of charcoal and etc£®Resin must be clear£® |
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| .2 Insulation class A(105¡æ) |
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| 2.2.1 funotions standards form |
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| No |
Item |
Unit |
Standards |
| 1 |
Thickness |
mm |
0.08¡¢0.13¡¢0.17¡¢0.20¡¢0.25 |
| 2 |
Density |
g/cm3 |
0.95-1.15 |
| 3 |
Tensile strength min |
N/mm2 |
MD¡¡¡¡70-90
CMD¡¡¡¡40-50 |
| 4 |
Elongation min |
% |
MD¡¡¡¡ 2.0-3.0
CMD¡¡¡¡7.0-9.0 |
| 5 |
Breakdown vol£®min |
kV/mm |
In air¡¡¡¡11-12
In oil¡¡¡¡45-50 |
| 6 |
Oil absorption min |
% |
8 |
| 7 |
Moisture content |
% |
4.0-8.0 |
| 8 |
Resin¡¯s content min |
% |
¡¡7¡¢ 6¡¢ 5¡¢ 4¡¢3.5 |
| 9 |
Ash content max |
% |
1.0 |
| 10 |
Adhesion strength min |
kPa |
450 |
| 11 |
dp |
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1000 | |
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| 2.3 Complete solidification condition ( DPRCP-A)£º |
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| 90¡À5¡æ3h¡¡£« 125¡À5¡æ6h |
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| Resin coat doesn¡¯t run off,move and out of shape after solidification£® |
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| 3. Test method |
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| 3.1 Take sample |
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| According to standards of web in GB450-79"Method of take paper and board's average sample and deal with samle before check¡±£® |
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3.2 Exterior |
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| Range estimation |
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| 3.3 Base materials¡¯thickness |
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| Clean the sample with spotless acetone 1000ml about two or three times dissolve the resin coat in acetone, stoving£®Then check its total thickness and tolerance according to GB451-79 ¡°Test method of paper and boaed¡¯s thickness¡±£® |
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| 3.4 Tensile strength and elongation |
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| Check it according to GB453-79 ¡°Test method of paper and boaed¡¯s tensile strength and elongating rate¡±£® |
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| 3.5 Tearing strength |
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| Check it according to GB455-79 ¡°Test method of paper and boaed¡¯s tearing strength ¡± |
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| 3.6 Breakdown voltage |
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| ¡¡ Check it according to GB408-78 ¡°Test method of solid insulating materials breakdown voltage¡±£® |
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| 3.7 Adhesion strength |
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| 3.7.1 Take sample |
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Prepared fourteen pieces of clean and smooth aluminum or copper plates, 0.5-1.0mm thickness,51mm width, 152mm longth£®Clean each plate with caetone, then stoving£®
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| Put four layers 51mm¡Á51mmof paper in between every tow piates , show as Fig£®2 |
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press35N/mm2 upon the contact surface then heat solidification according to 2.3.
3.7.2 Test method |
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| ¡¡ Determine the out strength of joint sample in pull machine£®Take off the maximum value and the lowest value, then calculate the average value£® |
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| 4 Test standards |
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| 4.1 DPRCP is agreed to ex-factory only after up to standard and it must outwith qualification£® |
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4.2 Test classfication
Ex-factory test and type test£® |
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| 4.3 Items of ex-factory test£º According to 2.1 and1,2,4,6,7,of 2.2 |
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4.4 Do type test£º
Before new product put into production£»
When new material or techmology has great change£»
Every procduce 10T£»
When there is quality question in ex-factory test£»
When re-produce after stop production over one year£»
When there is a considerable difference between result of ex-factory test and last type test£®
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| 4.5 It there is a item does not pass in type test , the re-test mast be done in double quantities of the no pass item£®If it does not pass again , the test does not pass£® |
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5 Packing , make , store and transit |
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| 5.1 Packing |
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| 5.1.1 Reel¡¯s diametyer£º300mm-360mm£® |
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| 5.1.2 The inside diameter of Reel¡¯s core£º76¡À2mm£® |
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| 5.1.3 The ends of reel must neat without gap£® |
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| 5.1.4 There are no more there broken ends in one reel£®Every broken must longer 20m , and there is a clear make in broken end made of colour paper£® |
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| 5.1.5 Reel must package with plastic film bag , and overhead in packing box£® |
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5.2 Make
Must make factory name , specification , type , date , gross weight and net weight on packing box£®Must with qualification in packing box£®Meanwhile mark symbols of dampproof , fireproof and shockproof on packing box£®
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| 5.3 Store and transit |
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| 5.3.1 DPRCP must be stored in where is dry , clean , ventilate and temperature is not higher than 35¡æ£®It must be stored far away from fire and warm air , and can not be directly shined by sun£®the store period is one year from the date of ex-factory£® |
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| Do test in its adhesion when it is stored over store period and it can be used yet if it passed the test£® |
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| 5.3.2 Proof damp , heat and shock during the transit£® |
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