High-voltage transformer bushings are insulating components that provide electrical isolation and mechanical support for conductors passing through transformer enclosures.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Rated Current | 630A to 4000A | |
| Rated Voltage | 69kV to 800kV | |
| Creepage Distance | 20mm/kV to 31mm/kV | |
| Temperature Class | -40°C to +105°C | |
| Mechanical Strength | Withstand 2.5x static load without damage | |
| Partial Discharge Level | <5pC at 1.1x rated voltage | |
| Power Frequency Withstand | 1 minute at 1.5x rated voltage | |
| Basic Insulation Level (BIL) | 350kV to 2400kV |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
Electrical component that steps up input voltage to high voltage levels required for dielectric strength testing
A static electrical device that transfers electrical energy between circuits through electromagnetic induction, typically changing voltage levels while maintaining frequency.
A critical component that prevents electrical discharge and ensures safe operation by isolating high-voltage components from each other and ground.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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Condenser bushings use concentric capacitive grading layers (paper and foil) to create uniform electric field distribution, suitable for higher voltages (>72.5kV). Non-condenser bushings rely on solid insulation thickness without grading, typically for lower voltage applications.
Visual inspections every 6-12 months, thermographic surveys annually, and comprehensive testing (power factor, capacitance) every 3-5 years or as per manufacturer recommendations and operating conditions.
Common causes include moisture ingress, partial discharge degradation, thermal cycling stress, mechanical damage during installation, contamination buildup on surfaces, and manufacturing defects in insulation layers.
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