GSA-OA (GOB Replacement)
Upgrade your transformers with reliable GSA‑OA Bushings
The direct replacement for GOB
Enhance safety, extend service life, and eliminate oil‑related maintenance with Hitachi Energy’s GSA‑OA dry‑type bushings. A proven 1:1 replacement for legacy GOB bushings.
Key Benefits:
Upgrading from GOB to GSA‑OA bushings delivers a safer, more reliable, and maintenance‑free solution for modern transformer performance.
Product Overview
The GSA‑OA series is a modern Resin Impregnated Paper (RIP) bushing designed for immersed oil‑to‑air applications. Engineered with HTV silicone rubber insulators, GSA‑OA provides a fully compatible, dimension‑matched improvement over traditional GOB bushings.
GSA bushings are available across 52–245 kV voltage classes and are built to meet demanding environmental and operational conditions.
Why upgrade from GOB to GSA-OA?
Upgrading from GOB to GSA‑OA bushings delivers a modern, high‑performance solution designed for safer, more efficient transformer operation. With direct 1:1 compatibility, lighter dry‑type construction, and enhanced resistance to fire, oil leakage, and harsh environmental conditions, GSA‑OA bushings offer a reliable and future‑ready replacement for aging GOB units.
- Matches oil-side geometry and flange dimensions of original GOB bushings
- Compatible configurations for draw-lead or removable-rod conductors to seamlessly adapt to the existing GOB setup
- Standard and customizable aluminum or copper air terminal options
- Dry-type RIP design eliminates oil leakage and fire risks
- Shatter-proof, vandal-resistant structure improves field resilience
- Hydrophobic silicone insulators provide excellent pollution and moisture performance, even in harsh climates
- Approximately 50& lighter than oil-impregnated bushings, simplifying handling and installation
- Mechanically strong and engineered for long-term performance
Technical Features
Core Technical Advantages
- RIPCOAT moisture barrier on the oil side for enhanced insulation reliability
- Flange design with RAL 7035 light gray corrosion-resistant finish compliant with CX corrosivity category
- Optional arcing horns for flashover protection
Replacement Compatibility and Selection Guide
Hitachi Energy provides a detailed selection table that matches each GOB model to its corresponding GSA‑OA replacement variant, ensuring correct dimensions (L1, L2, L4, L7), BIL ratings, and conductor options.
Installation and Maintenance
Detailed installation instructions are available in the Installation and Maintenance Guide, ensuring proper handling of conductors and insulation — especially when extended oil shields are used.
Frequently Asked Questions (FAQs)
Find quick answers to the most common questions about upgrading from GOB to GSA‑OA bushings, including details on direct 1:1 compatibility, improved safety, elimination of oil leakage, and the enhanced performance benefits of modern dry‑type RIP technology.
It is a direct replacement of old oil‑impregnated GOB bushings with modern dry‑type GSA‑OA bushings featuring silicone insulators.
Yes, GSA‑OA bushings are engineered for a 1:1 geometric match on the oil side and flange.
GSA supports both DL and RR setups to fit various GOB models.
Yes. Dry‑type bushings eliminate oil leakage, lower fire risk, and decrease routine maintenance needs.
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