Converter Transformers


Yonder converter duty transformers are suitable for complex power conversion systems. We offer transformers up to a rating of up to 25kVA in our range of turnkey solution for Hydrogen Generation 

We utilise the latest design, measurement, and testing tools to ensure each transformer meets and exceeds the latest industry standards, as well as operational and customer specifications. Our in-house capabilities include multi-secondary, star and extended-delta transformer design. Our converter transformers are manufactured after carefully performing seismic analysis and short circuit calculation. 


Yonder Offers


6.6 kV, 11 kV, 22 kV, 33 kV


Primary, star, delta or extended delta connection


2 – 27 secondary windings (up to 64 in exceptional requirements)

Vector group

-25 degrees to +25 degrees (5-degree variations)

Extended delta on LV windings create different angles


Voltage Pulses

Through use of different angles, different number of pulses can be achieved (12-48 pulses)


Oil type

Dry type, VPI  (upto 10 MVA)


Natural cooling (ONAN) or forced cooling (AF) or Oil-filled Transformers

Air cooling with directed air flow for Dry Type Transformers*


99% for large transformers

98% for transformers up to 1 kVA

Harmonics Control

Copper shield between HV and LV windings to contain harmonics to secondary load and not reflecting on primary

Winding Material

Copper foil as a conductor in LV winding or thinner conductor to keep Eddy current loss limited

Tap Changers

Off-circuit tap links can be provided on HV side

Converter Duty Transformers

Oil Cooled (ONAN) Transformers

Dry-Type (AN) Transformers

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Yonder DC Power Supplies are designed and manufactured for MW-scale hydrogen production.

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