INDUSTRY COMPONENT

Secondary Winding Bobbin

Insulating structural support for secondary windings in medium voltage current transformers

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Component Specifications

Definition
A precision-engineered insulating component that provides mechanical support, electrical insulation, and thermal management for the secondary winding coil in medium voltage current transformers. It maintains precise winding geometry, prevents inter-turn short circuits, and ensures proper heat dissipation during transformer operation.
Working Principle
Provides rigid structural support to maintain winding geometry under electromagnetic forces, offers high dielectric strength to prevent electrical breakdown between turns and to ground, and facilitates heat transfer from the winding to the transformer core or cooling medium.
Materials
Typically made from thermosetting plastics (phenolic, epoxy, or polyester resins) with mineral fillers for improved thermal and mechanical properties. May include glass fiber reinforcement for enhanced strength. Must have high Comparative Tracking Index (CTI >600V), UL94 V-0 flammability rating, and continuous operating temperature rating of 130°C minimum.
Technical Parameters
  • Thermal Class Class B (130°C) or higher
  • Dielectric Strength >12 kV/mm
  • Flammability Rating UL94 V-0
  • Dimensional Tolerance ±0.1 mm
  • Insulation Resistance >10^12 Ω
  • Comparative Tracking Index >600 V
Standards
IEC 61869, IEEE C57.13, ISO 9001

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Secondary Winding Bobbin.

transformer bobbin winding support electrical insulation current transformer component MV CT parts insulating bobbin winding former Secondary Winding Bobbin Secondary Winding Bobbin in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Medium Voltage Current Transformer Core Assembly

Precision wound magnetic core assembly for current measurement in electrical distribution systems

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Engineering Analysis

Risks & Mitigation
  • Electrical breakdown due to insulation failure
  • Thermal degradation under overload conditions
  • Mechanical deformation affecting winding geometry
  • Partial discharge leading to insulation deterioration
FMEA Triads
Trigger: Material impurities or voids in insulation
Failure: Partial discharge leading to insulation breakdown
Mitigation: Implement strict material quality control and vacuum impregnation processes
Trigger: Thermal cycling stress
Failure: Cracking or deformation of bobbin structure
Mitigation: Use materials with matched thermal expansion coefficients and adequate thermal class rating
Trigger: Inadequate dimensional precision
Failure: Improper winding tension and geometry affecting transformer accuracy
Mitigation: Implement precision molding with tight dimensional tolerances and regular tool maintenance

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerance ±0.1mm, concentricity within 0.05mm, surface finish Ra < 3.2μm
Test Method
Dielectric strength test per IEC 60243, thermal cycling test per IEC 60068-2-14, dimensional verification with CMM, material certification with UL and RoHS compliance

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a secondary winding bobbin in current transformers?

The bobbin provides mechanical support to maintain precise winding geometry, electrical insulation between turns and to ground, and thermal management to dissipate heat generated during operation.

Why are specific materials required for medium voltage applications?

Medium voltage applications require materials with high dielectric strength, excellent tracking resistance, and thermal stability to prevent electrical breakdown and ensure long-term reliability under high voltage stress.

Can secondary winding bobbins be customized for different transformer designs?

Yes, bobbins are often custom-designed with specific dimensions, flange configurations, and material formulations to match particular transformer core sizes, winding requirements, and application environments.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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