| production capacity£º |
|
|
Product introduction
Continuously Transposed Cable (CTC) is a type of winding wire, which continuously weaved by some strips of insulated rectangular wire according to two stacks arrangement, via special insulated materials. Mainly be used in manufacturing windings of large-Scale oil-immersed power transformers¡¢reactors¡¢and large-capacity dry type transformers. Using CTC to manufacture transformers, increases space factor, reduces cost due to reduction of volume, more important is that reduces circumfluence loss and eddy loss due to magnetic loss, simultaneous improves mechanical strength of winding¡¢shortens winding time.
Product Type
Polyvinyl acetal enameled with paper insulation CTC
Polyvinyl acetal enameled over coated bondable epoxy resin with paper insulation CTC
Polyvinyl acetal enameled with paper insulation¡¢hardened copper CTC
Polyvinyl acetal enameled over coated bondable epoxy resin with paper insulation¡¢hardened copper |
Manufacturing Scope
Number of single conductor: 5-63(odd number)
Individual conductor dimension:
Conductor thickness, a:1.00-3.15mm
Suggested width/thickness of single conductor: 2.5<b/a<7.5
If your required dimension out of above scope, please contact with us.
Number pf paper insulation layer: Max.24 layers at one time
Max.Height of CTC bundles: 80mm (excluding paper insulation)
Max.Width of CTC bundles: 26mm (excluding paper insulation) |
Materials
Single enameled conductor
Polyvinyl acetal enameled rectangular copper conductor, index 120¡¢155
Polyvinyl acetal over coated bondable epoxy resin rectangular copper conductor, index 120
Polyvinyl acetal enameled¡¢hardened rectangular copper conductor
Polyvinyl acetal over coated bondable epoxy resin¡¢hardened rectangular copper conductor
Polyesterimide enameled rectangular copper conductor, index 180
According to different electric insulation requirement to select Grade 1 enamel 0.08-0.11mm or Grade 2 enamel 0.12-0.16mm. Generally, epoxy resin increase of epoxy enameled rectangular wire is about 0.03-0.05mm.
Our company adopts medium wearing instrument (tg¦Ä) to filter enameling technics, makes enamel solidify more perfect.
If special enamel thickness required or use other types enameled wire, please contact with us.
Soft copper used for enameled rectangular wire shall conform to GB5584.2-85,the resistivity is not more than 0.01724¦¸?mm2/m at 20¡ã.According to different mechanical strength, below proof stress Rp0.2is recommended:
C1 Rp0.2(>100~180)N/ mm2
C2 Rp0.2(>180~220)N/ mm2
C3 Rp0.2(>220~260)N/ mm2
Wrapping insulation materials
Kraft paper¡¢High density paper¡¢High extensibility fibre paper¡¢Thermally up-graded paper Nomex-410¡¢Non-woven polyester cloth¡¢Polyester fibre netting binding strand.
If required other wrapping insulation materials, please contact with us.
Structure design and dimension calculation
Transposed pitch: The distance between two consecutive transposed units of CTC. Transposed pitch depends on minimum winding diameter and number of single conductor, simulation calculation of transposed pitch is:
S=d?¡Ç/n
S---Transposed pitch
d---Minimum winding diameter
n---Number of single conductor of CTC bundles
Under normal situation, transposed pitch is 10~14 times of individual conductor width, under special condition, could be 6~8times of individual conductor width.
If have special requirements on transposed pitch, please contact with us.
Inter-column paper IN order to enhance axial compressive strength of CTC and to avoid enamel scratch between strand stacks, could insert the inter-column paper or pressboard with special thickness. Suggested inter-column paper thickness is 0.13mm, generally, when (n-1)/2¡ÁA<10mm, then no need to insert inter-column paper, here A indicates thickness pf single conductor.
Overall dimension
The simple formula to calculate overall dimension of CTC is:
CTC bundles height ?H=1/2(n+1)A+¡÷
CTC bundles width W=2B+¡÷
Wherein: A---thickness of single conductor
B---width of single conductor
¡÷---dimension increase due to paper
Insulation (both sides)
Suggested drums for product packing (look at the table) |
Ordering information
Please clarify following information when ordering CTC¡¢The number of individual conductor and nominal dimension¡¢Type of enameled wire and type of enamel¡¢Type of insulation paper and inter-column paper¡¢dimension increase due to paper insulation¡¢Minimum winding diameter¡¢Number of drums for CTC¡¢length per drum¡¢Drums¡¯size. |
|
