Primary Conductor Pass-through: Rated Voltage Up to 36 kV

Component Specifications

Definition

A specialized electrical insulation component designed to safely pass primary conductors through the magnetic core of a differential current transformer while maintaining electrical isolation, preventing short circuits, and ensuring accurate current measurement by containing the magnetic field within the transformer structure.

Working Principle

Provides a controlled path for primary conductors to pass through the transformer's magnetic core aperture while maintaining dielectric strength and preventing eddy current losses through proper insulation and material selection, ensuring the primary current induces a proportional secondary current without interference.

Materials

High-grade electrical insulating materials such as epoxy resin, porcelain, or silicone rubber with flame-retardant properties; may include embedded metallic shielding or grading rings for high-voltage applications; rated for continuous operation at specified temperature classes (e.g., Class F: 155°C).

Technical Parameters

Parameter	Typical range	Notes & selection driver
IP Rating	IP65 or higher
Rated Current	100 A to 5000 A
Rated Voltage	Up to 36 kV
Creepage Distance	≥20 mm/kV
Dielectric Strength	Withstands 2*Un + 1 kV for 1 minute
Insulation Resistance	>1000 MΩ at 500 V DC
Operating Temperature	-40°C to +155°C

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 61869, IEEE C57.13, DIN EN 60044

Parent Products

This component is used in the following industrial products

Differential Current Transformer

A current transformer that measures the difference between currents in two conductors, used for ground fault detection.

View Product Details

Engineering Analysis

Risks & Mitigation

Electrical insulation failure leading to short circuits
Thermal degradation under overload conditions
Mechanical damage during installation

FMEA Triads

Trigger: Contamination or moisture ingress
Failure: Reduced insulation resistance and dielectric breakdown
Mitigation: Use sealed designs with desiccants and regular insulation testing

Trigger: Overcurrent or thermal cycling
Failure: Material cracking or delamination
Mitigation: Implement temperature monitoring and adhere to rated current limits

Trigger: Improper installation alignment
Failure: Mechanical stress on conductors or insulation
Mitigation: Follow manufacturer torque specifications and alignment guides

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% for accuracy class 0.5, ±1% for class 1 per IEC 61869

Test Method

Partial discharge testing, dielectric withstand test, insulation resistance measurement

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

Manufacturers of Primary Conductor Pass-through

Manufacturer profiles associated with Primary Conductor Pass-through.

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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 main function of a primary conductor pass-through?

It safely insulates the primary conductor as it passes through the transformer core, preventing electrical faults and ensuring accurate current measurement.

Can it be used in outdoor environments?

Yes, if designed with appropriate IP ratings and UV-resistant materials for outdoor durability.

How does it affect transformer accuracy?

Proper design minimizes magnetic field distortion and eddy currents, maintaining measurement accuracy per IEC 61869 standards.

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.

Primary Conductor Pass-through