THERMETICALLY SEALEDPROJECT INQUIRY
HST hermetically sealed transformer
PRODUCT INDEX / 2026

PRODUCTS

Hermetically sealed, dry-type, power and special-purpose transformers configured for the actual load and operating environment.

CONTACT ENGINEERING

From standard distribution to special duty

The range covers wound-core and sealed-oil transformers, two dry-type constructions, power transformers, furnace duty, shunt compensation and offshore special models.

Wound Core Transformer
01Hermetically sealed distribution series

Wound Core Transformer

A continuously wound core reduces core joints and excitation loss, combined with a sealed oil tank for industrial and distribution service.

Construction
Wound core / sealed oil tank
Application
Industrial distribution
Configuration
Project-specific rating
Hermetically Sealed Transformer
02Sealed-oil distribution equipment

Hermetically Sealed Transformer

The sealed tank limits direct contact between insulating oil and outside air. Configuration is matched to load, voltage, temperature rise, installation and environment.

Insulation
Oil immersed
Oil system
Hermetically sealed
Installation
Indoor / outdoor
Power Transformer
03Grid and industrial power distribution

Power Transformer

Power transformers for step-up, step-down and industrial supply duties, engineered around efficiency, temperature rise, loss, insulation coordination and reliable service.

Duty
Step-up / step-down
Cooling
Oil natural / forced air
Configuration
Matched to system data
Cast Resin Dry-Type Transformer
04Resin-insulated dry-type series

Cast Resin Dry-Type Transformer

Epoxy-resin insulated windings for distribution projects with defined fire-safety, clean-operation, space and maintenance requirements.

Insulation
Epoxy cast resin
Cooling
Natural / forced air
Installation
Primarily indoor
VPI Dry-Type Transformer
05Vacuum-pressure impregnated insulation

VPI Dry-Type Transformer

Vacuum-pressure impregnated windings balance insulation, heat dissipation and mechanical strength for industrial loads and project ventilation conditions.

Process
Vacuum pressure impregnation
Insulation
Dry-type system
Loads
Industrial / rectifier
Amorphous Alloy Transformer
06Low no-load-loss distribution series

Amorphous Alloy Transformer

An amorphous-alloy core reduces no-load loss for continuously energized distribution systems with varying load factor and life-cycle energy targets.

Core
Amorphous alloy
Priority
Low no-load loss
Application
Energy-efficient distribution
Furnace Transformer
07Smelting and high-current loads

Furnace Transformer

Designed for furnace and smelting duties with high current, frequent regulation and impact loads, with impedance, tapping and cooling matched to the process.

Load
Furnace / smelting equipment
Duty
High current / impact load
Regulation
Process-specific
Shunt Reactor
08Reactive compensation and voltage control

Shunt Reactor

Absorbs capacitive reactive power and controls light-load voltage rise, with parameters selected from system voltage, compensation duty, harmonics and connection.

Function
Reactive compensation
System
Grid / industrial power
Rating
Defined by system study
Offshore Platform Transformer
09Special model / offshore power equipment

Offshore Platform Transformer

A power-frequency transformer for conventional distribution duties on drilling platforms, FPSOs and offshore facilities, engineered for salt mist, humidity, vibration, restricted space and continuous service.

Application
Drilling platform / FPSO
Frequency
Project nominal power frequency
Environment
Salt mist / humidity / vibration
Wideband Transformer
10Special model / offshore drilling application

Wideband Transformer

A converter-fed transformer for variable- and wide-frequency drive duties on offshore drilling platforms, engineered around frequency range, harmonics, load profile, temperature rise and insulation stress.

Supply
Converter-fed / wide-frequency
Application
Offshore platform drive system
Design inputs
Frequency / waveform / load profile
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