Heat Resistant Continuously Transposed Conductors of Enamelled Copper Wires

• Customization: Available
• Insulation Level: H, F, B, E
• Certification: ISO9001, CE, CCC, RoHS
• Model NO.: Heat resistant continuously transposed conductors
• Brand: Xincheng
• Application: Transformer, Instrument, Electrical Equipment, Transformer, Transmission Line
• Shape: Flat Wire
• Conductor Material: Copper/Aluminum, Copper Wire
• Model Number: Continuously Transposed Conductor
• Usage: Large Transformer or Transmission and Distributio
• Insulation Enamel: Pew, Piw, Eiw, Aiw, Ei/Aiw
• Type Enameled Wire: Round or Flat Enameled Wire
• Insulation Mateial: Polyvinyl Acetal Enamel, Polyester-Imide, Polyeste
• Standard: IEC, NEMA, GB, JIS
• Transport Package: Pallet
• Specification: KG
• Trademark: XINCHENG
• Origin: China

Product Description

Quick Details
Place of Origin: China                                 Brand Name: XINCHENG
Model Number: Continuously Transposed Conductor        Type: insulated
Application: Transformer, transmission line                Conductor Type: Solid
Usage: large transformer or transmission and distribution lines
Conductor Material: Copper/Aluminum                   Insulation enamel: PEW, PIW, EIW, AIW, EI/AIW
Type enameled wire: round or flat enameled wire            
Insulation mateial: Polyvinyl acetal enamel, Polyester-imide, Polyester -film or customized
Covered material: paper , cotton wire                      Temperature class: 120-180
Feature: high strength                                 Standard: IEC, NEMA, GB,JIS
 
Product Description:
Continuously transposed cable (CTC) is a type of winding wires weaved by certain number of (5 - 87 strands) strips of enameled rectangular wires in two ranks according to special tectonics and wrapped by special insulation material. It is mainly used for large-scale oil-immersed power transformers, reactors and large-capacity dry type transformers.
    CTC conductor can improve using rate of winding space, min-ish volume and reduce cost, most of all, it decline the loss of circumference and eddy loss caused by leaking of magnetic field and also has advantages of improving machine strength of winding and saving winding time.
Continuously Transposed Conductor (CTC) is the most used for windings on Medium and ultra-high power transformer. It consist of a group of enameled wire, which are transposed or create a kind of rectangular strand. Now it also widely used in new energy car.

Enamel type available

Code	Type of Enamel	Temperature Class	Application Range
PVF	1720-20  Plyvinyformal	120 ºC	Oil filled transformer
PEW EIW	Modified Polyester,  Polyester-imide	F ( 155 ºC)  H (180 ºC )	Gas, Dry & Traction Transformer
PE - AIW	Polyester overcoated with Polyamid-imide	F (180ºC ) C (200ºC )	Gas, Dry & Traction Transformer
EIW	Polyester-imide	H ( 180ºC )	Gas, Dry & Traction Transformer
PET	Polyester -film	H (130ºC )	Gas, Dry & Traction Transformer

Continuously Transposed Conductors ( CTC ) is a bundle of winding wire consisting of a number of enameled rectangular wires  (5 - 87 strands) . Each strand is transposed in turn without twist along with its length and then covered with layers of insulation paper or film (PET)or the required  insulation materials.
CTC provides a ready-insulated and tightly packed array of conductors for building transformer coils which are suitable for use in the manufacturing of medium and ultra high power transformers and reactors.
 
Production Range
· Number of strands         5 -87
· Width of strand           3.0 -14.0mm
· Thickness of strand        1.1 -3.0mm
 
Advantages:
· Shortened winding time for the core of transformer
· Decreased size and weight of the transformer and reduce the cost
· Reduced eddy and circulating current losses
· Excellent coil performance and simplified winding processing 
· Improved mechanical strength of winding ( Hardened self-bonding CTC)
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 (tgδ) 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 0.01724Ω?mm2/m at 20°.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
Type of wrapping insulation materials For CTC:
Kraft paper
Insulating paper Up to 500KV Power (with high density)
Thermally Upgraded Paper
Crepe Paper (High Tension Paper)
22HCC Dennison Paper
Paper with bonding layer
Polyester film (PET)
NOMEX-410
Denission
Polyester cord
Non-woven cloth
Polyester fiber 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*∏/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×A<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)
FAQ
[Q]: What is the single conductor in CTC cable?
A : Polyvinyl acetal enameled rectangular copper wire, class 120,155 PVA+epoxy enameled rectangular copper wire, class 120   Polyester imide(epoxy) enameled rectangular copper wire, class 180 Choose thin insulation increase (0.08mm-0.11mm) or thick one (0.12mm-0.16mm) according to requirements of different electric insulation, and thickness of epoxy is about 0.03mm-0.05mm of thermal enameled rectangular wires. .
[Q]: What's the strength of enameled wire?
A :C1 Rp0.2>100-180N/mm2 
C2 Rp0.2>180-220N/mm2 
C3 Rp0.2>220-260N/mm2
[Q]: Insulation materials ?
A : Kraft, high density paper, Denission, Nomex, polyester cloth, polyester fiber net bonding strand. Please connect us if choose other insulation paper.
[Q]: Which specification is important?
A : 1. number and nominal dimension of single conductor 
2. type and increase of enameled wires 
3. type of insulation paper and intercolumn
4. thickness of wrapped paper 
5. The Min diameter of winding 6. number of reels of CTC 

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.  
 
Packaging & Delivery:
Packaging Details
 
Drum Size (CTC) (Steel and Wood or Wood plate structure):

Size фmm	D1 Flange		D2 Core		D3 Bore		L2 outer width		L1 Inner width		Drum Weight Kg	Drum Capacity Kg
	Size mm	Tolerance mm	Size Mm	Tolerance mm	Size mm	Tolerance mm	Size mm	Tolerance mm	Size mm	Tolerance Mm
900	900	±5	600	±5	105	+2	385	±5	285	±5	42	390
1000	1000	±5	637	±5	105	+2	450	±5	350	±5	45	740
1350	1350	±5	1000	±12	105	+2	580	±8	428	±8	125	1000
1600	1600	±8	1100	±12	105	+2	680	±8	500	±8	194	2000
1800	1800	±10	1300	±12	105	+2	1000	±10	820	±10	280	3500
1800	1800	±10	1300	±12	105	+2	1300	±10	1120	±10	300	4600

Outer packing: wooden spool or according customers' special requirement
Port: Qingdao, Shanghai, Tianjin
 
Please Contact Us
 Miss: lydia
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