Quality Transformer and Electronics custom-designs and manufactures Autotransformers. These transformers, are used in power applications to interconnect systems operating at different voltage levels where isolation is not required. An autotransformer, also called an autoformer, is used to step voltages up or down. The primary and secondary windings share common turns and thus provide no isolation. Autoformers are typically smaller for an equivalent power level when compared with a transformer with isolated primary and secondary windings and are therefore often less expensive.
***BELOW SPECIFICATIONS ARE ONLY REPRESENTATIVE OF OUR STANDARD REQUESTS AND DO NOT ACCOUNT FOR POSSIBLE CUSTOM AUTOTRANSFORMER REQUIREMENTS OR POSSIBILITIES.
|Power Rating||50 VA up to 2 MVA|
|Voltages||up to 15,000 Vrms|
Not finding what you're looking for?
- General Purpose Transformers have isolated windings but not to the degree of isolation transformers. These are designed for general use
- Control Transformers are ranged from 50 VA up to 5 kVA and are used as safety devices
- Isolation Transformers have increased isolation
- High Voltage Transformers are transformers that operate at higher voltages than our General Purpose Transformers
- More transformers
The Autotransformer Connection
Also called an Autoformer
Autotransformers are used in applications where electrical isolation is not a critical requirement. In Autotransformers, the primary and secondary circuits have part of a winding in common, resulting in a reduction in size and cost. When the ratio V2:V1 is 0.3 or more, Autotransformers are used with advantage. It is important to note that as input and output voltages are closer to one other, savings in material are higher. Common applications are motor starters, boosters, and/or static balancers.
There are several advantages in using an autotransformer. The voltage/current transformation and impedance conversion aspects of a two winding transformer are retained but with lesser material and weight, translating into lower costs. Common electrical differences between the isolated transformer and the autotransformer include:
- the losses are reduced which will increase the efficiency,
- reactance is reduced resulting in better regulation characteristics, and
- lower exciting current will occur.
All these benefits are enhanced as the voltage ratio approaches unity.
However, there are also disadvantages to be considered with this type of arrangement, such as:
- loss of electrical isolation and a larger short circuit current,
- larger short circuit forces on the winding as well, and
- common neutral/ground for primary and secondary.
3.5 kVA Autotransformers Power Rating 3.5 kVA Frequency 50/60 Hz No. of Phases 1 Primary 208 Vrms Secondary 300 Vrms Certifications
- CE Mark
- NRTL to UL506
- EN 60742
This autotransformer is used in the semiconductor capital equipment industry to help step-up voltage for a piece of equipment.
|Power Rating||160 kVA|
|Primary||380 Vrms +/- 10% taps|
|Secondary||480 Vrms @ 1,000 kVA|
|Notes||For use in thin film coating equipment. Designed for high leakage inductance to control harmonic currents associated with a six pulse rectifier.|
How to Order
What You'll Need
Our engineers are well-versed and knowledgeable and will be able to help guide you through the design and specification process. However, they will need to know a few parameters before they can design your transformer. Below is a list of the things they will need to know in order to design your Autotransformer:
- Power Rating of the transformer (required)
- Operating frequency (required)
- Input and output voltages (required)
- Output current (required)
- Termination requirements (i.e., ring-lug compatibility, etc.)
If you do not know how to spec out a transformer, or need more information, we have many ways of helping you figure it out. Please feel free to contact us via the form below, by phone number, or by email address below and one of our technical assistants or engineers will be more than happy to assist you. You can also visit our Resources Center to learn more about your product options.
How to Contact Us
|Quality Transformer and Electronics|
|963 Ames Avenue|
|Milpitas, CA 95035|
|Phone: +1 (408) 263-8444|
|Fax: +1 (408) 263-8448|
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