Stress Cone: Temperature Range -50°C to +150°C

Component Specifications

Definition

A stress cone is a specially shaped component used in high-voltage insulated cable terminations to manage and redistribute electrical stress concentrations at the cable termination point. It functions by gradually tapering the insulation interface to control the electric field gradient, preventing partial discharges and insulation failure. This component is essential for maintaining dielectric integrity in medium to high-voltage applications (typically 1kV to 500kV).

Working Principle

The stress cone operates on the principle of electric field control through geometric shaping. By creating a gradual transition from the cable's conductive core to the surrounding insulation, it reduces the electric field intensity at critical points. This prevents localized stress concentrations that could cause corona discharge, tracking, or insulation breakdown. The conical shape provides a controlled path for electric field lines, ensuring uniform stress distribution across the insulation interface.

Materials

Silicone rubber (HTV or LSR), EPDM rubber, Ethylene Propylene Rubber, with embedded semi-conductive layers. Materials must have dielectric strength >20kV/mm, tracking resistance >600V, and thermal stability from -50°C to +150°C.

Technical Parameters

Parameter	Typical range	Notes & selection driver
IP Rating	IP68 for outdoor applications
Flame Rating	UL94 V-0 or IEC 60332-1
Shore Hardness	40A to 70A
Voltage Rating	1kV to 500kV
Temperature Range	-50°C to +150°C
Dielectric Strength	≥20 kV/mm
Tracking Resistance	≥600 V (CTI)

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 60502-4, IEEE 48, IEC 60840, IEC 62067, DIN VDE 0278-629

Parent Products

This component is used in the following industrial products

High-Voltage Insulated Cable Termination

Electrical termination component for high-voltage cable systems providing insulation and connection.

View Product Details

Engineering Analysis

Risks & Mitigation

Improper installation leading to partial discharge
Material degradation from environmental exposure
Incorrect voltage rating causing insulation failure
Thermal cycling stress leading to cracking

FMEA Triads

Trigger: Improper installation or incorrect cable preparation
Failure: Partial discharge leading to insulation breakdown
Mitigation: Follow manufacturer installation guidelines, use proper tools, and conduct HV testing after installation

Trigger: Material degradation from UV exposure or chemical contamination
Failure: Reduced dielectric strength and tracking
Mitigation: Use weather-resistant materials, regular inspection, and preventive maintenance

Trigger: Thermal cycling stress
Failure: Cracking or separation at interfaces
Mitigation: Use flexible materials with good thermal stability, ensure proper bonding

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5mm on critical dimensions, ±10% on dielectric properties

Test Method

Partial discharge test per IEC 60270, HV withstand test per IEC 60502-4, thermal cycling test per IEC 60840

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

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Manufacturers of Stress Cone

Manufacturer profiles associated with Stress Cone.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a stress cone in cable terminations?

The primary function is to control and redistribute electrical stress at the termination point to prevent insulation breakdown and partial discharges.

How do I select the right stress cone for my application?

Selection depends on voltage rating, cable diameter, insulation material, environmental conditions, and compliance with relevant standards like IEC 60502-4 or IEEE 48.

Can stress cones be used for both indoor and outdoor applications?

Yes, but outdoor stress cones require additional weatherproofing, UV resistance, and higher IP ratings (typically IP68) compared to indoor versions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Stress Cone