CUT C CORES

Wound transformer cores are manufactured in process of winding up the transformer strip on a mandrel followed by the processes of cutting the hot-manufactured and synthetic resin-bond core. Wound cores shape is better adapted for course of the magnetic induction current and the structure of material grain is used more effectively when compared with cores composed of sheet stampings of various shapes.

Cut cores are assembled with a certain air-gap between the pieces, insulation pieces are placed in these gaps during the assembly of the bobbins. Cut surfaces of these cores can be round, oval and rectangular.

BENEFITS OF CUT C CORES
  • Electrical energy saving thanks to low specific iron watt losses
  • Saving in quantity of used copper for winding thanks to smaller dimensions and weight of cut cores
  • Saving in work costs exert for transformers assembly thanks to easy assembly
  • Low humming
Guaranteed magnetic values of wound cores at frequency of 50 Hz

According to the Liberty Technotron s.r.o. internal norm

Core Type* Max. specific losses p1,5/50 [W/kg] Max. magnetic field density Heff at B 1,5T [A/m]
C 08001 – 10000 2,5 400
C 10001 – 26003 2,2 350
C 26004 – 90005 2,2 300

*) manufactured from M165-35S

Cut surface quality „A“ - according to the DIN/IEC norms
Core Type* Max. specific losses p1,7 [W/kg] Max. magnetic field density Heff at B 1,7T [A/m]
SG = Q 2,2 265
SU = U 2,2 265
SE = R 2,2 265
SM = M 2,2 265

*) manufactured from M150-30S/M140-27S

cut surface quality „C“ - according to the DIN/IEC norms
Core Type* Max. specific losses p1,7 [W/kg] Max. magnetic field density Heff at B 1,7T [A/m]
SG = Q 1,9 125
SU = U 1,9 125
SE = R 1,9 125
SM = M 1,9 125

*) manufactured from M150-30S/M140-27S

Marking of cores with air gaps

A core consists of two horse shoe – shaped parts. In order to secure their correct assemblage both parts are marked by a coloured position mark on their front side. The colour of the position mark also determinates the band thickness used for coiling of the core. The core is also marked by a serial number.

YELLOW
band thickness 0,35 mm
RED
band thickness 0,30 mm
WHITE
band thickness 0,27 mm
GREEN
band thickness 0,15 mm
CUT C CORES SINGLE-PHASE

Application possibilities of cut C cores single-phase

  • chokes
  • combined instrument transformers
  • specially designed transformers

Type line of supplied cut C cores single-phase

  • According to the DIN 41309 norm – SG, SU, SE, SM*
  • According to the IEC 329 norm – Q, R, M, U*
  • According to the Liberty Technotron s.r.o. internal norm – C*

CUT C CORES THREE-PHASE

Application possibilities of cut C cores three-phase

  • instrument transformers
  • voltage transformers
  • inductors
  • transducers
  • suppression technology
  • pulse transformers
  • chokes
  • special transformers

Type line of supplied cut C cores three-phase

  • According to the DIN 41309 norm – S3U*
  • According to the IEC 329 norm – 3U*

STEPPED CROSS-SECTION CORES

Shape of stepped cross-section cores allows better flow of magnetic flux density and their special grain structure is used more effectively as compared with cores composed of metal sheet stampings of various shapes. Specific intersection of these cores allows varied use of circular coils.
As a result of considerable variety of demands on construction we do not provide any standardized assortment. Stepped cross-section cores are manufactured with two or three steps according to customer’s specification.

BENEFITS OF STEPPED CROSS-SECTION CORES

  • Electrical energy saving thanks to low specific iron watt losses
  • Saving in quantity of used copper for winding thanks to smaller dimensions and weight of cut cores
  • Saving in work costs exert for transformers assembly thanks to easy assembly
  • Low humming
  • Better use of coils scope due to stepped cross-section
  • Easier winding of wire on a circular coil

 

 

Guaranteed electric magnetic properties of stepped cross-section cores with air gaps

Standard guaranteed highest permissible values of nominal losses and magnetic field intensity at the magnetic induction of Bmax = 1,5 ; 1,7 T and frequency of 50 Hz as divided into four groups:

Material Nominal losses max. [W/kg] Magnetic field intensity max. Heff pro Bmax 1,7T [A/m]
p1,5 p1,7
M165-35S 2,0 2,5 350
M150-30S 1,9 2,3 300
M140-27S 1,8 2,2 300
0,15* 1,6 2,2 400

*) at 400Hz/1T corresponding nominal losses 8 – 8.5 W/kg

BEFORE SHIPMENT ALL CORES ARE RE-MEASURED, WE PROVIDE THE ELECTROMAGNETIC VALUES ATTEST UPON CUSTOMER’S REQUEST.