Transformatorenkerne und CRGO für Hersteller weltweit. Vom lagernden Elektroband bis zum fertigen Kern mit bis zu 100 t deckt unsere Fertigung Materialvorbereitung, Präzisionszuschnitt, Montage und Exportverpackung ab.
890mmMaximale Verarbeitungsbreite beim Querteilen
~3000tRegulärer CRGO-Lagerbestand
~1500tMonatliche Verarbeitungskapazität
15 JahreBranchenerfahrung
~30 Mio. USDJahresumsatz
~7 TageReguläre Lieferzeit für Standardprodukte
ISO 9001:2015Qualitätsmanagementsystem
Über Chenfan
Chenfan Electric vereint Transformatorenkernfertigung, CRGO-Verarbeitung und weltweite Lieferung. Mit rund 30 Mio. USD Jahresumsatz, einem regulären CRGO-Lagerbestand von 3.000 t und 1.500 t monatlicher Verarbeitungskapazität decken wir die Fertigung von der Werkstoffauswahl bis zur Lieferung des fertigen Kerns ab. Wir fertigen einzelne Kerne bis 100 t, mit einer Grathöhe unter 0,02 mm und einem Blechfüllfaktor über 97 %.
02 Unsere Produkte
Kernfertigung. Vom Stahl zur Baugruppe.
01
Transformator- Kerne
Mehrstufige Step-lap-Stöße, Fenstergeometrie und Spannschnittstellen nach freigegebener Zeichnung.
Kornorientiertes Elektroband in der Güte, Dicke und Beschichtung, die Ihre Transformatorenauslegung erfordert – mit Coil-Kennzeichnung und Werkstoffzeugnissen.
Schwere Kerne werden als Projekte geplant — Montagestabilität, Hebevorrichtungen und Transportsicherung werden vor Fertigungsbeginn festgelegt.
Kerne für Leistungstransformatoren ↗
Schützt die Beschichtung und begrenzt Strompfade zwischen den Blechen.
>97%Blechfüllfaktor
Sichert den in der Auslegung angesetzten wirksamen Kernquerschnitt.
Angaben zur Fertigungsfähigkeit. Die Abnahmewerte des Projekts richten sich nach der vereinbarten Werkstoffspezifikation und der freigegebenen Zeichnung.
Geschichtetes Elektroband. Definierte Schnittstellen. Erkunden Sie einen dreischenkligen geschichteten Kern — von den Blechen bis zur Spannkonstruktion.
01 / 05
Dreischenkliger geschichteter Kern
Schenkel und Joche bestehen aus abgestuften Paketen kornorientierten Elektrobands. Wählen Sie eine Markierung am Modell, um ein Merkmal näher anzusehen.
Zum Drehen ziehen · zum Zoomen scrollen
Aufbau
Dreischenklig, geschichtet
Stoß
Mehrstufiges Step-lap
Werkstoff
CRGO / GOES-Kernbleche
Veranschaulichende Geometrie. Die endgültige Paketfolge, Stoßgeometrie und Spannkonfiguration richten sich nach der freigegebenen Kundenzeichnung.
05Referenzprojekte
Ausgeführte Referenzprojekte
330kV
Höchstspannungs-Transformatorenkern
Dreiphasenkern mit Multi-Step-Lap-Stößen für ein Höchstspannungstransformatorenprojekt.
Kurze Antworten. Projektspezifische Anforderungen werden bei der Zeichnungsprüfung und im Angebot bestätigt.
Fertigen Sie direkt nach Kundenzeichnung?
Ja. Vor der Fertigung prüfen wir die freigegebene Zeichnung, Werkstoffspezifikation, Stoßfolge, den Montageumfang und die Abnahmekriterien.
Welche Zeichnungsformate akzeptieren Sie?
PDF, DWG und DXF. Geben Sie Zeichnungsnummer, Revision und Einheiten an. Senden Sie die Dateien nach Vorbereitung Ihrer Anfrage direkt an Frank.
Welche CRGO-/GOES-Blechdicken sind verfügbar?
Standard sind 0.18 / 0.20 mm. 0.23 / 0.27 / 0.30 mm sind je nach Projektspezifikation und Materialverfügbarkeit erhältlich.
Liefern Sie vollständig montierte Transformatorkerne?
Ja. Stimmen Sie Verspannung, Isolierung, Hebevorrichtungen und Transportzustand mit der freigegebenen Zeichnung ab.
Liefern Sie vorgeschichtete Kernbleche?
Ja. Bestätigen Sie Paketkennzeichnung, Schichtfolge, Montageverantwortung und gewünschten Lieferzustand.
Welche Angaben benötigen Sie für ein Angebot?
Bitte nennen Sie Transformator-Nenndaten, Kernzeichnung, Werkstoffsorte, Blechdicke, Lieferform, Menge oder Gewicht, gegebenenfalls Verlustziel sowie Lieferbedingungen und Zielort.
Wie wird die Grathöhe kontrolliert?
Schnittkantenzustand und Prozessparameter werden kontrolliert; während der Fertigung erfolgen Gratprüfungen. Die aktuelle Fertigungsfähigkeit liegt bei <0.02 mm. Prüfverfahren und Stichprobenplan sind abzustimmen.
Wie wird der Blechfüllfaktor bewertet?
Legen Sie fest, wie wirksamer Stahlquerschnitt oder Nettoblechdicke mit dem montierten Paket verglichen werden. Die aktuelle Fähigkeit liegt bei >97%. Werkstoff, Beschichtung, Druck und Messverfahren sind abzustimmen.
Kann eine Verlustmessung am fertigen Kern vereinbart werden?
Fragen Sie dies bei der Zeichnungsprüfung an. Bestätigen Sie vor der Bestellung Kernzustand, Erregungsanordnung, Frequenz, Flussdichte, Messverfahren und Abnahmekriterien.
Wie werden Kerne für den Seetransport geschützt?
Die Verpackung kombiniert Feuchtigkeits- und Kantenschutz mit einer auf Kerngeometrie und Gewicht abgestimmten Sicherung. Bestätigen Sie Transportweg, Hebeverfahren und Entladebedingungen.
Fertigen Sie große Leistungstransformatorkerne?
Einzelkerne können bis zu 100 t gefertigt werden. Geometrie, Montagestabilität sowie Hebe- und Transportvorkehrungen werden je Projekt geprüft.
Welche Incoterms sind möglich?
EXW, FOB und CIF sind nach Abstimmung möglich. Nennen Sie den vereinbarten Ort oder Hafen. Andere Klauseln müssen im Angebot bestätigt werden.
Die erste Antwort enthält Fertigungsmachbarkeit, Lieferumfang, Preis und Termin. Rund 3.000 t CRGO am Lager sind der Grund, warum Standardprodukte in etwa einer Woche versandt werden.
When does a thinner lamination justify its material and processing cost?
Key Data
Compare specific loss at the same flux density, frequency and material test method.
JFE patent Table 1: at 1.7 T, 50 Hz and a 2 mm lap, 0.20 mm material gave 0.69 W/kg sheet loss and 0.86 W/kg core loss; 0.23 mm gave 0.73 and 0.92 W/kg respectively.
Technical Explanation
Thinner steel can reduce the classical eddy-current component of loss. Total core loss also depends on material grade, domain treatment, joint geometry and the mechanical condition after processing. Thickness alone therefore cannot establish the finished-core result.
The cited patent comparison used three-phase laboratory cores with five-step laps, a 15 mm stack and equal B8 of 1.91 T. It demonstrates a result under defined conditions, not a production guarantee or a ranking that applies to every pair of commercial grades.
For a given net steel build, thinner material requires more laminations. Handling, alignment and cutting workload change. The quotation should account for these operations and any change in effective steel area, rather than treating gauge as a simple substitution.
Engineering Implications
Compare suitable grades in both gauges against the actual loss target and operating frequency.
Review joint geometry and the expected stack build before freezing the material choice.
Procurement Implications
Evaluate the additional material and processing cost against the value of the expected finished-core loss reduction.
Request comparable core evidence where loss requirements are critical; a lower certificate value alone is insufficient.
What to Confirm Before Ordering
Grade, nominal thickness, coating and domain treatment.
Drawing, net steel area, excitation conditions and acceptance limits.
Test scope, reporting basis and any agreed material substitution.
How can building factor help compare cores without hiding differences in the test basis?
Key Data
BF = measured core loss ÷ reference material loss, with both expressed on a consistent basis.
If core loss is reported in watts, the reference in W/kg must be multiplied by the agreed steel mass before calculating the ratio.
Technical Explanation
Building factor describes the relationship between a manufactured magnetic circuit and its material reference. Cutting effects, joint flux distribution, assembly stress and geometry can all contribute to the difference. It includes design and manufacturing effects, so it cannot isolate supplier workmanship by itself.
The denominator needs an explicit definition. An actual coil measurement and a grade maximum are different references. Single-sheet and Epstein results must not be interchanged without an agreed, applicable method. Changing the reference can change the ratio even when the measured core watts stay the same.
A lower building factor does not automatically mean lower absolute loss. A core made from lower-loss material can have a larger ratio and still dissipate fewer watts. Read the ratio alongside measured loss and exciting current at the specified operating point.
Engineering Implications
Keep drawing, material basis, frequency, flux density and test arrangement consistent when comparing results.
Review consecutive comparable cores to understand variation rather than relying on one favourable result.
Procurement Implications
Write the denominator and mass basis into the acceptance requirements.
Keep the contractual loss limit separate from a supplier comparison based on building factor.
What to Confirm Before Ordering
Actual coil loss or grade maximum; material test method and any conversion.
Test frequency, flux density, waveform and measurement boundary.
Core mass, measured watts, exciting current and required report.
Why can cores made from the same CRGO grade deliver different magnetic performance?
Key Data
Mill certificate: evidence for the specified material and its recorded test results.
Finished-core report: evidence for the assembled core under a stated test arrangement.
Chenfan process parameters: burr height <0.02 mm; stacking factor >97%.
Technical Explanation
A mill test certificate identifies the starting material. Check the coil reference, grade, thickness and magnetic data against the order. The certificate does not describe the cutting, joint alignment, clamping or handling that takes place afterwards.
The finished core contains cut edges, overlapping joints and a mechanical stress state. Those conditions help explain why the same nominal grade and thickness can produce different loss and exciting-current results. A low burr reading and a high stacking factor are useful process indicators; neither is a standalone magnetic acceptance test.
Material tests on processed samples can support an investigation, provided sampling and specimen preparation are defined. Treatments such as stress-relief annealing can change what the comparison reveals. Finished-core testing must also have an agreed excitation method, calculation boundary and acceptance basis. It supports pre-shipment verification but does not replace the transformer manufacturer’s final testing.
Engineering Implications
Link the material certificate and process records to the supplied core or lamination batch.
Read no-load loss and exciting current together under comparable test conditions.
Procurement Implications
Agree the inspection and testing scope before ordering, including which reports will be supplied.
For critical designs, request evidence of repeatability across comparable production.
What to Confirm Before Ordering
Material traceability and certificate requirements.
Sample preparation, test frequency, flux density and reporting units.
Finished-core test availability, acceptance criteria and responsibility for final transformer testing.
Engineering definition
Engineering Question
Which drawing details must be agreed before a core is released for cutting?
The drawing must define the same physical product for the transformer designer and the core factory. Confirm usable window clearances against the winding, insulation and clamping arrangement. Distinguish clear window width from centre distance; they are not interchangeable dimensions.
Limb and yoke widths must include the complete stepped section or a controlled lamination schedule. Stack thickness needs a stated measurement condition: net steel build, finished physical thickness and thickness under compression describe different quantities.
Step geometry should identify packet widths, lamination quantities, orientation and joint sequence. Drawing revision control then fixes which combination is approved for production. A current CAD file and a controlled PDF can help resolve geometry, but neither removes the need to confirm unclear dimensions.
Overall assembled dimensions, clamp interfaces, lifting access and shipping envelope also belong in the review where applicable. They are supporting interface checks beyond the eight headline items.
Engineering Implications
Check winding fit and structural interfaces before converting the drawing into a cutting schedule.
Resolve conflicting dimensions and document approved deviations before production release.
Procurement Implications
Use estimated weight for preliminary discussion; confirm manufacturing geometry before final production planning.
Include the required supply format because laminations and fully assembled cores need different delivery definitions.
What to Confirm Before Ordering
Drawing number, revision, approval date and quantity.
Material grade, thickness, lamination schedule and joint arrangement.
Finished dimensions, tolerances, measurement conditions and included hardware.
Joint geometry
Engineering Question
What must be controlled for a step-lap design to deliver repeatable core performance?
Key Data
The manufacturing definition needs step sequence, lap length, joint gap and laminations per step.
Loss and exciting-current results require a stated frequency, flux density and core configuration.
Technical Explanation
A step-lap joint distributes lamination ends across successive positions. Magnetic flux redistributes between the overlapping sheets near those ends, creating a local field that differs from the field in a straight limb. Joint geometry therefore affects magnetic behaviour as well as mechanical assembly.
The benefit depends on the material, core design and manufactured joint. A larger number of steps is not a universal guarantee of lower loss, and the smallest achievable gap is not a complete specification. Lap length, gap, layer grouping and sequence must be considered together.
The JFE patent reports different core-loss results when lap length changes while material thickness is held constant in its laboratory configuration. This supports evaluating joint geometry alongside material selection; its particular dimensions should not be copied into an unrelated drawing.
Correct cutting dimensions must be preserved through stacking. Misalignment, mixed packets or an incorrect sequence can change the intended joint. Mechanical restraint must hold the assembly without introducing uncontrolled local pressure.
Engineering Implications
Define the complete joint schedule and check its reproduction through the stack.
Assess loss and exciting current; agree separate noise evaluation when it is a project requirement.
Procurement Implications
Ask for the joint definition behind the term “multi-step lap”.
For cut or pre-stacked supply, agree identification and assembly instructions so the receiving factory can preserve the sequence.
What to Confirm Before Ordering
Approved joint drawing, step count, grouping and sequence.
Dimensional tolerances, inspection points and assembly responsibility.
Test scope and acceptance requirements for the supplied format.
What does a burr-height requirement tell you about a cut CRGO lamination?
Key Data
Chenfan burr-height control: <0.02 mm.
Burr height is one edge-quality measurement; it is not a finished-core loss guarantee.
Technical Explanation
A burr is raised metal at a cut edge. Excessive burrs can interfere with stacking and, under contact pressure, damage insulation between laminations. Electrical contact between sheets can provide additional current paths and contribute to local heating or loss.
The risk depends on the edge condition, coating, alignment and assembly pressure. The specified limit is a manufacturing control value, not a universal boundary below which insulation damage is impossible. Visual appearance or a smooth feel cannot establish magnetic performance.
Tool wear, cutting clearance and material condition influence the edge produced by slitting and cross-cutting. A useful inspection plan defines where to measure, how samples represent the batch, which instrument is used and what action follows an out-of-limit result. A measured value needs that context to be comparable.
Cutting can also introduce local mechanical stress without producing an obviously large burr. Edge inspection should therefore sit alongside dimensional checks, coating inspection and any agreed magnetic verification.
Engineering Implications
Inspect representative cut edges and changes associated with tool condition.
Control handling and clamping so acceptable laminations remain protected during assembly.
Procurement Implications
Include the burr requirement and its inspection basis in the technical agreement.
Avoid treating a single edge reading as evidence that an entire core meets its loss limit.
What to Confirm Before Ordering
Material grade, thickness and coating specification.
Measurement method, sampling positions and reporting requirement.
Batch traceability and the agreed response to nonconforming laminations.
Core assembly
Engineering Question
How does stacking factor affect the magnetic section used in a core design?
Key Data
Chenfan stacking-factor control: >97%.
On a consistent section basis: effective steel area = gross stacked area × stacking factor.
Technical Explanation
Stacking factor expresses how much of a defined stack is occupied by steel. Insulation coating and spaces between laminations mean the gross physical section is not identical to the effective steel section. The design and inspection calculation must use compatible definitions.
At the same magnetic flux, a smaller effective steel area gives a higher flux density. This is why substituting a stack dimension or material thickness without checking the net steel build can change the magnetic operating point. The resulting loss and exciting current depend on the material and operating conditions.
The measured result also depends on the specimen or assembly being evaluated and its compression condition. A material sample value and a finished-assembly assessment should not be treated as identical without explaining the method.
Flatness, burrs, cleanliness, packet alignment and restraint all matter. Increasing clamp force alone is not a sound way to correct poor stacking: excessive or uneven stress can affect the magnetic material and the structure.
Engineering Implications
Use the agreed effective steel area when checking flux density and lamination quantities.
Check finished stack dimensions and joint alignment as well as the reported factor.
Procurement Implications
Agree how the >97% requirement is evaluated for the ordered product.
Keep stacking-factor acceptance distinct from finished-core loss acceptance.
What to Confirm Before Ordering
Net steel area, gross section and material thickness basis.
Measurement method, sample or assembly scope, and compression condition.
Finished stack tolerance, inspection records and magnetic test requirements.
Packing & delivery
Engineering Question
What must an export packing specification protect besides the outside of the case?
Key Data
Define supply format, packed mass, dimensions, support points and handling method.
Address moisture exposure and mechanical movement separately in the packing plan.
Technical Explanation
A transformer core should arrive with its surfaces, geometry and assembly identification preserved. Moisture protection limits corrosion risk, while supports and restraints limit movement, edge damage and distortion. A strong outer case does not by itself resolve either requirement.
The protection system should suit the route, storage period and receiving conditions. Specify a compatible moisture barrier and, where appropriate, corrosion protection and desiccant. VCI packaging is one possible component; it should not be described as an absolute barrier that makes rust impossible.
Restraints should transfer loads through suitable supports rather than relying on exposed lamination edges. The plan for a fully assembled core must account for its lifting arrangement and stability. Cut and pre-stacked laminations also need packet identification and protection of the intended assembly sequence.
Destination handling matters. Confirm how the package will be unloaded, stored and opened, including the equipment available at the receiving factory. Packing photos, identification and an agreed receiving inspection help resolve discrepancies before the core enters assembly.
Engineering Implications
Coordinate the packing arrangement with the core structure and approved lifting method.
Preserve critical dimensions, joint condition and assembly instructions through delivery.
Procurement Implications
Include packing requirements in the quotation instead of leaving them to dispatch.
Define transport scope, Incoterm, destination and any planned storage before installation.
What to Confirm Before Ordering
Supply format, case or frame arrangement, gross mass and package dimensions.
Moisture protection, restraints, marks and lifting instructions.
Unloading equipment, storage conditions, inspection documents and applicable wood-packing requirements.
