A low-tension bushing is a precision epoxy die-cast component that forms the primary insulating barrier between a transformer's winding and its oil tank, keeping air, external dust, and moisture from migrating into the internal oil circuit.
- Insulation body: cast from high-grade epoxy resin in a single, void-free pour, giving the bushing consistent dielectric strength from batch to batch and eliminating the internal air pockets that can trigger partial discharge under load.
- Sealing performance: the dense, non-porous epoxy structure blocks external dust, moisture, and airborne contaminants from reaching the winding-to-tank interface, protecting insulation performance over the long term.
- Dimensional accuracy: manufactured under tightly controlled die-casting conditions so every bushing fits the transformer tank wall with a reliable, repeatable seal, reducing installation variance across production runs.
- Thermal and mechanical stability: the epoxy formulation resists cracking, chalking, and deformation across a wide operating temperature range, maintaining insulation integrity through repeated thermal cycling and load fluctuation.
- Application fit: sized and profiled for box-type, photovoltaic, and oil-immersion transformers, as well as high-current rectifier transformers used in electrolytic non-ferrous metal and chemical processing plants.
- Long-term reliability: because contamination ingress is a leading cause of insulation degradation in oil-filled transformers, the bushing's sealing reliability directly extends maintenance intervals and overall equipment service life.
Backed by consistent manufacturing control and strict quality checks at every casting stage, this low-tension bushing gives transformer builders a dependable, drop-in insulating component that performs reliably across varying temperature and humidity conditions, from indoor substations to outdoor photovoltaic sites exposed to seasonal weather swings and industrial atmospheric conditions.
Quality control checkpoints are built into every stage of the die-casting process, from resin mixing and mold temperature monitoring to final dimensional inspection, so each bushing shipped meets the same insulation and fit specifications as the last. Custom bushing lengths and mounting profiles can also be produced to match specific transformer tank designs, giving equipment builders a single supplier for both standard and application-specific bushing requirements. Technical drawings and fit-check samples are available prior to bulk production, helping customers confirm compatibility with their specific transformer tank design before committing to a full order.
Jiangsu Penglong Electric Engineering Co., Ltd. is a specialized manufacturer integrating R&D, design, and production of power transmission components, high-current conductor systems, and industrial electrical connection products.
With extensive industry experience, the company specializes in high-current conductive connections, copper-aluminum transition solutions, transformer components, and industrial furnace conductor systems. Supported by a complete manufacturing system and modern equipment, Penglong offers customized and large-scale production.
Its products are widely used in transformers, industrial furnaces, electrolysis equipment, switchgear, and power distribution systems. Main products include busbars, conductive rods, copper-aluminum connectors, terminals, flexible connectors, water-cooled cables, and other custom conductive components.
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