Electrotechnical components. Strip Wound Cores
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1 Strip Wound Cores
2 Introduction Strip wound cores or transormers and chokes Iskra, d. d. is one o the major Slovenian producers o various types o strip wound transormer cores made o oriented silicon iron steel strip. With our own production line and highly trained personnel, we ulill the requirements o local and oreign markets. To produce high-quality cores or transormer and chokes, we use an oriented silicon iron steel strip that contains % silicon. We mainly produce cores rom M-P and M0-N materials. The strip thickness is 0. and can be used up to 00 Hz. The grain oriented silicon iron steel strip Traoperm N with thickness 0.1 cover the requency range rom 00 Hz to khz. For the production o cores, we select our GOESS suppliers and ensure diligent control o production and the quality o the entire working process. All cores are measured 0% by a computer controlled measurement system MDK00A. The test reports are available or our customers in PDF orm. Additional services We also oer our customers cores insulated with a polyester ilm (Mylar oil) or cores coated with epoxy resin. Both insulations are provided with UL ile numbers. Development o cores Our engineers use their knowledge and experience to oer the proessional advice you need or the planning and selection o cores to meet your requirements. Types o cores. Rectangular cores. Rectangular cut cores. Oval cores. Oval cores with air gap Standard cut cores: CM, CE, CG, CU and C cores Special cores according to customer demand. All types can be produced according to customer demand in various dimensions and shapes The standard cores are available in quality»a«(unground) or quality»c«(ground). The codes in the table or standard cores are intended or quality»a«.
3 Introduction Typical electromagnetic eatures o blank cores Material Thickness Frequency Hz Field strenght He (A/) Minimum density B(T) M0-N M-P Dimensions and tolerances External diameter - D Tolerance Internal diameter - d Tolerance Height - h Tolerance < ±0. < ± < + < < 0 < 0 < 0 < < 00 < 0 < 00 ±0. ±1.0 ±1. ± ± ±. ± ±. < < 0 < 0 < 0 < < 00 < 0 < 0 ±0. ±0. ±0. ±1.0 ±1. ± ± ±. < < 0 < 0 < 0 < < 00 < 0 < Remarks Dimensions Toroidal cores are mostly used or power and instrument transormers, chokes and rotary transormers. We oer cores with various dimensions external diameter rom 1 to 00 internal diameter rom 1 to 0 height rom to Cores are produced in accordance with the DIN 11 standard customer request. In order to achieve the best quality o cores the D d=1. to ratio must be established The stacking actor ç is the proportion between the eective magnetized average and geometrical average o the core
4 Equations The universal transormer equation V RMS V RMS N AFE B PEAK, N A V FE B PEAK V RMS N A FE B PEAK - root mean square voltage - requency - number o turns - core cross section area in m - peak magnetic lux density in T (tesla, Vs/m ) Hysteresis losses W P 1. H B MAX H W H 1. MAX B energy o hysteresis losses P H - hysteresis losses - requency - hysteresis coeicient Empirical exponent varied rom about but is oten given 1. or silicon iron core. Calculation o cross section area A F E P, 0 Hz AFE P - cross section area - requested transormer power - requency Insulations o toroidal cores The toroidal cores can be insulated with a Mylar oil 1 x 0 %, x /, etc or coated with epoxy resin. In some cases we put it in a plastic housing. All insulation materials are according to the UL V0 standard. A typical polyester ilm (Mylar oil is 0 microns thick and or wide The UL ile number is E. The cores can be coated with Resicoat EL-HLG0R (000) epoxy resin. The UL ile number is E1.
5 CM and CE cores CM and CE cores CM and CE cores consist o our core halves (see drawing bellow). The coil ormer is on the middle leg. The transormer has horizontal or vertical holders. The horizontal holder and cores are wrapped with a clamp. Vertical holders o a core are ixed to the core with screws, washers and nuts Cut cores are mostly used or power transormers, chokes and special transormers. C cores are distributed according to the standard thereore they are listed under labels CM and CE cores. r a e c g b
6 CM and CE cores CM cores CE cores Number Number Cores Cores a max a max b-1 pt b-1 pt c c g min g min e min e min r max r max m Fe kg m Fe kg I Fe I Fe A Fe A Fe P n VA P n VA CM CE0 CM CE CM CE CM CEa CMa CEb CEa CEb CEa CEb CEa CEa CEb CEb CEc CE10a CE10b CE10c CE1a CE1c CE1a CE1b CE1c CMb CMa CMb
7 CU cores CU cores CU cores consist o two core halves (see drawing bellow). The coil ormers are on both legs. Horizontal holders are tight to cores by a clamp. r a e c g b
8 CU cores Number Cores a max b-1 pt c g min e min r max m Fe kg I Fe A Fe P n VA CU cores CU1a CUa CUb CU0a CU0b CUa CUb CUa CUb CU0a CU0b CUa CUb CU0a CU0b CUa CUb CU11a CU11b CU1a CU1b CUa CUb CU1a CU1b CUa CUb CUc CUa CUb CUc CU1b
9 CG cores CG cores CG cores consist o our core halves (see drawing bellow). The coil ormers are on both middle legs There are horizontal and vertical holders. The horizontal holders are ixed to cores with one or two clamps. The vertical holders are ixed to the core by screws, washers and nuts. r a e c g b
10 CG cores Number Cores a max b-1 pt c g min e min r max m Fe kg I Fe1 A Fe P n VA CG cores CG/ CG/ CG1/ CG/ CG/1 CG/1 CG/ CG/ CG0/1 CG0/1 CG0/ CG0/ CG/1 CG/ CG/ CG/ CG/ CG/ CG/ CG/1 CG/1 CG/ CG/ CG/1 CG/ CG/ CG/1 CG/0 CG1/ CG1/
11 CU cores CU cores CU cores consist o two core halves (see drawing bellow). The coil ormers are on all three legs. Horizontal holders are tight to cores by two clamps. r e a c g b 11
12 CU cores Number Cores a max b-1 pt c g min e min r max m Fe kg I Fe1 I Fe A Fe P n VA CU cores CUa CUb CUa CUb CU0a CU0b CUa CUb CU0a CU0b CUa CUb CU11a CU11b CU1a CU1b CUa CUb CU1a CU1b CUa CUb CUc CUa CUb CUc
13 Materials: GOESS GOESS - grain oriented silicon iron steel strip Type o GOESS materials Caon description M0 M0 Description in acc. with DIN 00 Old label M0H 0M0H Newlabel in acc. with EN M-P M-0P Loss in magnetization low low Thickness 0. Loss o W/kg T 1. T M1 VM111-0P 0M1H M111-0P low 1.11 M VM11-0P 0MH M11-0P M0-S low decreas M M VM-S M M M-S M00-N decreas normal M VM-N M M0-N normal M VM-0N 0M M0-0N normal 0. M M VM111-N VM-0S VM1-S M 0M M111-N M-0S M1-S M1-0N normal decreas decreas normal H M0-P low Traoperm N GO N Appearant power o single phase core Appearant power o three phase core 000 [VA] [VA] Appearant power 00 0 Appearant power d = 0,0 = 0 Hz d = 0,0 = 0 Hz 0 1 0,1 1 [kg] Weight 0,1 1 0 [kg] Weight 1
14 Accessories Toroidal cores Rubber washer Tinned round plate CM, CE, CU, CG and CU standard cores are provided with ollowing accessories: Clamps Cartoon washer Plastic coilormers Vertical and horizontal holders Welded Nut Bolt b b b d c e r1 g c a c a a 1
15 Accessories 1 Clamp, bolt and nut Clamps Code a b c e a a b b c c r1 Bolt Nut Screw DIN d CM CM CM CM CM CM CE CE CE CE CE10 CU0 CG/1 CU CU CU0 CU CU0 CU CU CU1 CU11 CU CU1 CU CU CU CU0 CU CU0 CU CU11 CU1 CU CU CU1 CU Remarks: M. M. M. M M M M M M M M M. M M M M M M M M M M M M M M. M M M M M M M M M M M M.x1 M.x1 M.x0 Mx Mx0 Mx0 Mx0 Mx0 Mx0 Mx0 Mx0 M.x1 Mx0 Mx0 Mx0 Mx0 Mx Mx Mx Mx0 Mx Mx Mx Mx Mx M.x0 Mx0 Mx0 Mx0 Mx Mx Mx Mx Mx0 Mx Mx Mx0 A set o clamps consist o clamps, a bolt, a nut and a screw All Type b cores are supplied with two sets o clamps
16 Accessories Core with holder - CMa Core with holder - CU0b 1
17 Accessories, Measurements Core with holder - CU0a MDK00A computer controlled measurement system The electromagnetic properties o cores are measured by an MDK00A computer controlled measurement system. A BH curve, current and voltage shapes and their RMS values are displayed. The cores are measured in one, two or three points or by scanning. All parameters are memorized on a hard disk. The table below the diagrams shows electromagnetic values in numbers. A customer can get these results in a PDF orm by . 1
18 Special cores Coated oval cores Toroidal cores with an air gap 1
19 Special cores Rectangular cores Toroidal cores with Mylar insulation 1
20 Published by Iskra, d. d. Version 1.0, March 01 Iskra, d.d. Stegne 1 SI-00 Ljubljana Slovenia Phone: iskra@iskra.eu
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