Page 6 - Energize August 2022

COVER STORY

Advantages of cast resin type

transformers

Information from ArmCoil

ArmCoil has been supplying into various markets and applications over the past few years.

Please contact us on www.armcoil.co.za for enquiries.

hen researching the advantages of cast resin dry- Reliability: The cast resin transformer has a service life expectancy
type transformers, you may find the information of 30+ years, and a low failure rate when operated within its
Wavailable to be somewhat incomplete. Furthermore, designed parameters. This makes it a highly reliable component of
only a few of its beneficial features are well known, with one of any electrical infrastructure.
the most noteworthy being its minimal fire risk due to zero oil
usage. For proven reliability statistics and
case studies, please contact ArmCoil
Self-extinguishing, low fire hazard: The transformer insulation
consists of an epoxy resin and quartz powder mixture (an eco- for further information.
friendly material). This allows the winding to be flame-retardant,
self-extinguishing and almost maintenance free, eliminating Low maintenance: The cast resin transformer only needs air
the need for costly fire extinguishing equipment. It will also not to cool, and liquid testing becomes obsolete. Its smooth coil
produce toxic gases, not even under the effects of arcing. surface eliminates heavy dirt build-up, even in the most extreme
circumstances. The only recommended maintenance is a routine
Zero oil usage: The cast resin transformer only needs air to visual inspection by technical personnel, and a wipe down of the
cool. Therefore, it eliminates extra costs and labour for liquid- transformer as required.
level checking, oil testing, oil recycling costs and dielectric
testing for moisture absorption. Being almost maintenance
free, there are no more on-site oil leaks, so no there are no
gasket replacements and so on.

Eco-friendly and safe: Cast resin transformers pose zero risk
for oil leaks and pollution of the environment. Transformer
explosions during normal operation are highly unlikely due
to the self-extinguishable, non-toxic substances utilised,
even during external fires. They are also suitable for heavy
condensation and polluted environments, and may also
withstand abrupt environmental changes from -25°C to +40°C
over a very short time. Cast resin-type transformers have
also proven to be ideal for solar and wind renewable power
applications.

TIP: Always try to ensure that your preferred manufacturer has
passed/ obtained C2/E2/F1 tests according to IEC 60076-11 and
that it is approved, i.e., KEMA type tested.

Low-cost installation and lower load losses: There are almost
no restrictions on the installation site. Furthermore, there will
be no groundwater protection costs during site preparation. The
closer the transformer is to the load, the lower the cable losses
and cost.

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