ANSI Transformer Bushing | High‑Voltage Insulated Bushing for Distribution Transformers

ANSI Transformer Bushing Complete Product Introduction

In terms of internal sealing structure, every contact surface between the core components of the ANSI transformer bushing is equipped with high‑quality oil‑resistant rubber washers. These specialized gaskets feature excellent oil resistance, aging resistance and compression resilience, effectively preventing transformer insulating oil leakage and external moisture penetration. To achieve overall internal tightness and consistent structural stability, a set of high‑strength compression springs is installed inside the oil storage tank of each bushing. The central compression force generated by the spring group continuously compresses all internal components, eliminating assembly gaps, avoiding loose contact caused by long‑term vibration and thermal cycling, and maintaining stable sealing performance throughout the entire service life of the bushing.

The flange part of the ANSI transformer bushing is equipped with multiple functional auxiliary devices to facilitate field installation, daily operation and regular technical testing. It is integrated with a professional vent plug, an oil sampling and extraction device, and reserved installation interfaces for dielectric loss testing and partial discharge detection. These built‑in testing structures allow engineering and maintenance personnel to regularly monitor the operating state of the bushing without disassembly, effectively detecting potential risks such as internal dampness, insulation aging and oil deterioration in advance.

ANSI standard transformer bushings support two mainstream connection methods for transformer high‑voltage lead wiring, adapting to different on‑site assembly processes and structural designs. The first method is cable threading connection, which is suitable for compact transformer internal wiring and centralized cable layout scenarios. It features simple installation, neat wiring structure and strong adaptability for small and medium‑sized distribution transformers. The second method is guide rod current‑carrying connection, which adopts a rigid conductive guide rod for current transmission. This structure offers higher mechanical strength, stronger short‑circuit resistance and more stable large‑current conduction performance, making it widely applicable for medium and large power transformers with high load capacity and strict operational stability requirements.

All ANSI transformer bushings undergo strict factory tests, including power frequency withstand voltage test, lightning impulse withstand test, partial discharge detection, sealing tightness test and mechanical cantilever load test. Each finished product complies with ANSI C119.4 and related transformer equipment standards, ensuring stable electrical performance, reliable mechanical structure and excellent environmental adaptability. The products can operate continuously and stably in outdoor environments with large temperature differences, strong ultraviolet radiation and certain pollution levels, effectively resisting aging, deformation and oil leakage failures.

With complete specification coverage, standardized structural design and reliable industrial‑grade performance, our ANSI transformer bushings are widely applied in power distribution stations, industrial and mining enterprise power supply systems, municipal power grids and renewable energy power generation supporting transformer projects. Whether for new transformer manufacturing, old equipment maintenance or standard spare part replacement, our ANSI standard bushings can provide highly matched and high‑quality supporting solutions.