ISODRY ® Series Online Transformer Insulation Drying Systems

HERING ISODRY ® Series - Online Transformer Insulation Drying & Degassing Systems help in getting the most out of your transformers

HERING prides itself on the number of transformer treatment options that it offers its business partners. The ISODRY® Series is focused specifically on moisture removal, particularly from the paper insulation in the transformer core. The harmful effect of water on the transformer dielectric strength is generally well-known and appreciated and there are a number of solutions that address that. The ISODRY® Series, and its vacuum based complement, TIDO, reduce aging effects on the cellulose insulation by continuously removing water – unattended.


ISODRY ® Series Online Transformer Insulation Drying Systems

The HERING ISODRY® online transformer insulation dry out systems do not require the use of vacuum equipment and rely on an adsorbent molecular sieve media that will not absorb oil but will remove – and hold – moisture from the oil. Dry oil is hygroscopic and when circulated back to the insulation after passing through the columns, adsorbs moisture from the paper insulation in a dynamic process. A low- speed oil pump circulates the oil continuously or in user-determined operation cycles. Inlet and outlet inline hygrometers constantly measure the water removed and indicate both locally and remotely when there is a need to replace the media in the columns. Change-out is rapid and with each column able to hold around 3.5 kg of water, infrequent. The ISODRY® represents a modern solution to an age-old problem and comes with state-of-the-art options including remote monitoring, control and access, bright, local readout using Siemens state- of-the-art HMI and vivid graphics that allow for instant ease of understanding. A comprehensive monitoring and alarm system complete the package.

Continuous online removal of moisture and gas from solid insulation and oil

  • Based on extensively proven technology
  • Easily installed on energized transformer
  • Temperature, moisture and transformer condition monitoring available
  • Robust design for long lifetime
  • High quality steel piping
  • All components from Western brand manufacturers
  • Numerous safety features for protection

Online drying your transformers with the ISODRY® Series grants:

  • Benefits for new transformers – moisture content can be kept below the original factory level, thus protecting the transformer from day 1
  • Benefits for older or wet transformers – Continuous drying over several months brings down moisture & gas content to acceptable levels for extended lifetime
  • Effective moisture removal for oil & paper – ISODRY® ensures lowest possible moisture within transformer oil and insulation material
  • Insulation drying for vacuum-rated and non-vacuum-rated transformers – The moisture removal takes place within the equipment transformer vacuum tight ISODRY® without affecting the operation
  • No downtime due to transformer overhaul – operated on energized transformers as effectively as on un-energized transformers

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