INDUSTRY COMPONENT

Insulating Core

Insulating core for high-voltage bushings that provides dielectric strength and mechanical support in electrical equipment.

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Component Specifications

Definition
A cylindrical or conical insulating component within high-voltage insulating bushings, designed to isolate conductive parts at different potentials while withstanding electrical, thermal, and mechanical stresses. It serves as the primary dielectric barrier between the high-voltage conductor and grounded flange, preventing flashover and ensuring safe operation in transformers, switchgear, and other high-voltage apparatus.
Working Principle
Operates by creating a controlled dielectric path with high resistivity to block current flow between conductors at different voltages. The core's geometry and material properties distribute electric field gradients evenly, prevent partial discharges, and dissipate heat generated by dielectric losses.
Materials
High-purity epoxy resin impregnated with silica fillers, porcelain (alumina silicate), or cycloaliphatic epoxy with mineral additives. Materials must have dielectric strength >20 kV/mm, volume resistivity >1e14 Ω·cm, and thermal class ratings from 105°C to 180°C.
Technical Parameters
  • Thermal Class F (155°C) or H (180°C)
  • Water Absorption <0.1%
  • Dielectric Strength ≥25 kV/mm
  • Tracking Resistance CTI ≥600 V
  • Compressive Strength >150 MPa
  • Partial Discharge Level <5 pC at 1.5x rated voltage
Standards
IEC 60137, IEEE Std 48, DIN 47636

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Insulating Core.

insulating core high-voltage bushing dielectric component electrical insulation transformer bushing epoxy insulator porcelain insulator Insulating Core in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

High-Voltage Insulating Bushing

Electrical insulation component for high-voltage conductor pass-through in equipment enclosures.

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Engineering Analysis

Risks & Mitigation
  • Dielectric breakdown due to contamination
  • Thermal degradation from overload conditions
  • Mechanical cracking from thermal cycling
  • Partial discharge leading to insulation failure
FMEA Triads
Trigger: Surface contamination (dust, moisture)
Failure: Reduced dielectric strength leading to flashover
Mitigation: Regular cleaning, hydrophobic coatings, controlled environment installation
Trigger: Thermal overstress beyond material rating
Failure: Material decomposition and loss of insulation properties
Mitigation: Temperature monitoring, adequate cooling, proper thermal class selection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerance ±0.5mm, concentricity within 0.2mm
Test Method
Partial discharge testing per IEC 60270, power frequency withstand voltage test per IEC 60060-1, thermal cycling test per IEEE Std 98

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 typical lifespan of an insulating core?

Properly maintained insulating cores can last 30-40 years, depending on operating conditions, voltage stress cycles, and environmental exposure.

How does temperature affect insulating core performance?

High temperatures reduce dielectric strength and accelerate aging. Cores are rated by thermal class (e.g., Class H for 180°C) to ensure performance within specified temperature ranges.

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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