Insulating Core: Water Absorption <0.1%

Q: 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.

Q: 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.

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60137, IEEE Std 48, DIN 47636

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Insulating Core

Manufacturer profiles associated with Insulating Core.

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Frequently Asked Questions

What is the typical lifespan of an insulating core?