Step-Up Multitap Transformer

Overview

The Step-Up Multitap Transformer is engineered for applications where a single unit must adapt to varying grid conditions, inverter configurations and site requirements. Its externally reconfigurable HV connection allows the secondary winding to be arranged in either delta or star without factory intervention, giving project teams flexibility during commissioning and throughout the plant's service life.

Designed with tap changer arrangements of up to 50 positions, this transformer accommodates wide voltage adjustment ranges that standard distribution units cannot cover.

Typical Applications

This transformer is developed for demanding energy and industrial environments:

• Solar power plants — inverter step-up duty
• Battery energy storage systems (BESS)
• Oil & gas facilities
• Water pumping stations and irrigation infrastructure

Each of these applications imposes conditions — harmonic content, ambient extremes, corrosive atmospheres — that the design addresses directly rather than by derating a general-purpose unit.

Key Design Features

• Externally reconfigurable HV connection — delta or star selection without opening the tank
• Up to 50 tap positions for wide voltage adjustment
• Harmonic-tolerant design — suitable for continuous operation under inverter-driven harmonic load
• IP65 / NEMA 4X cable boxes for dust-tight and water-jet-resistant terminations
• Corrosion-resistant tank options — painted, fully hot-dip galvanized, or stainless steel (304 or 316L)
• Cooling flexibility — radiator or corrugated wall construction depending on site layout

Built for Harsh Environments

Solar fields, offshore-adjacent oil & gas sites and pumping stations expose equipment to conditions that shorten the life of conventionally specified transformers. DATSAN addresses this at the design stage:

• Tank material selected according to the corrosivity of the installation site
• 316L stainless steel available for coastal, saline and chemically aggressive atmospheres
• Full hot-dip galvanizing as a cost-effective alternative for moderately corrosive sites
• Sealing and termination systems rated for dust ingress and high-pressure washdown

Harmonic Performance

Inverter-fed and variable-speed drive applications generate harmonic currents that increase winding and core losses, raise operating temperatures and accelerate insulation ageing. This transformer is designed to operate continuously under elevated harmonic content, with winding and core design accounting for the additional thermal load rather than relying on oversizing alone.

Why Choose DATSAN?

• Over 30 years of transformer engineering experience
• Project-specific design rather than catalogue adaptation
• Proven supply to international energy and infrastructure projects
• In-house manufacturing and testing capability

Standards & Compliance

Designed and tested in accordance with:

• IEC 60076
• ANSI C57
• ISO 9001 Quality Management System
• ISO 14001 Environmental Management System
• ISO/IEC 17025 Accredited Testing Laboratory
• CE Marking
• Routine, type and special tests available upon request

Customization & Technical Support

Every unit is configured around the specific plant it will serve. Options include:

• Voltage ratio, tap range and number of tap positions
• Vector group and HV connection arrangement
• Tank material and surface protection system
• Cooling configuration and accessory package
• Cable box rating and termination type