Auto-transformers are a single winding transformer, useful where isolation from the mains supply is not required.
SES can design & supply custom auto-transformers to importers of electrical equipment, or electrical contractors installing imported equipment.
SES can supply:
Single Phase Auto-transformers
Three Phase Auto-transformers
Friendly Advice To Assist With Your Application
Advantages of SES Auto-transformers:
Fast turnaround of custom transformers - often within days
Available as open type with flying leads or terminal blocks
Choice of mounting brackets
Terminal blocks or flying leads
Tough Varnish Coating - either clear or black.
Can be encased in powder coated steel (IP21) enclosure for hard wiring
Insulation classes up to class H - 180Ã,Â°C
Available in a wide power range - from 10VA to 500 KVA
Australian Standard AS61558 - 1997 compliant
If you have electrical equipment from overseas that is designed to operate on a voltage different to Australian power (single phase 240v 50Hz, or three phase 415v 50Hz) we can help you with the correct auto-transformer.
Save yourself the expense of having imported electrical equipment rewound to operate from Australian power . A suitably rated auto-transformer can save you the expense of having equipment rewound, or having to buy an isolation transformer.
Auto-transformers are ideal for adapting imported equipment to Australian power (single phase 240v 50Hz, or three phase 415v 50Hz).
Auto-transformers are smaller, lighter & cheaper than isolation transformers of the same power.
For example, a three phase auto-transformer to power equipment rated at 200v 10KVA (imported from Japan) would be about half the size & weight of an equivalent isolation transformer.
Even greater savings can be achieved using an auto-transformer if the input & output voltages are closer together - e.g. single phase 240v / 220v or three phase 415v / 380v
Important Points To Consider With Auto-transformers :
Auto-transformers do not provide isolation from the electrical supply.
Auto-transformers are only suitable when the ratio of input/output is less than about half. Single phase 240v input / 100v are around the lowest viable output voltage.
Similarly, three phase 415v input / 200v output is about the lowest viable output voltage.
Auto-transformers can be used for step up as well as the more common step down applications.
There is always a common terminal in an Auto-transformer - this must always be connected to the neutral of the input supply (not the active).
Care should be taken to ensure that any imported equipment will operate at a power frequency of 50Hz. Some imported equipment (e.g. motors) may be rated at 60Hz only (as opposed to 50-60Hz) and may overheat if operated at 50Hz, even with the correct voltage applied.
Australian Standard AS 3000 - 1986 (Clause 4.28.4) requires that an auto-transformer that changes voltage by more than 25% must be an integral part of the equipment it is powering. This can be achieved by hard wiring the equipment to the output of the auto-transformer.
With our wide range of components & enclosures in stock, you can have a custom made auto-transformer designed specifically for your needs within days. Phone, fax or email your enquiry to us today - we may be able to help you even if you are unsure of the specifications required.
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Southern Electronic Services Pty Ltd was incorporated in July, 1977 after trading as a partnership for the previous 6 years.
This company manufactures power transformers, chokes and other wound components which are specifically designed to meet our customers' requirements.
A wide range of stocked materials enables your urgent requirements to be met within days, or sooner
State of the art, microprocessor controlled winding equipment enables us to produce an excellent product in both conventional and toroidal transformers and makes it possible to meet delivery and quantity requirements.
At the same time, we retain our ability to produce a single unit or small numbers if so requested.
Southern Electronic Services P/L is a member of the Standards Association of Australia, and all our products are designed and tested to conform with relevant Australian and International Standards.
Since September 1993, a Quality Assurance system to AS 3902 has been in place, which, combined with our extensive testing procedures, ensures our customers receive reliable service and products, at a reasonable price.
All our products carry a twelve month guarantee covering materials and manufacture and we jealously guard the good name that Southern Electronic Services has built up over more than thirty years of transformer production