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Auto- Transformers

The auto transformer has the advantages of simple structure, high power efficiency, small work loss, small Small voltage drop, small size, and the transformer installation space can be designed according to requirements, and has good cost performance.

Description

A.  Overview
Structurally, it is a transformer in which a common winding is connected in series with another winding and is not isolated from the grid.

B.  FEATURES
The auto transformer has the advantages of simple structure, high power efficiency, small work loss, small Small voltage drop, small size, and the transformer installation space can be designed according to requirements, and has good cost performance.

C.  Design Considerations
1.  High work efficiency
2.  Small voltage drop
3.  Voltage and number of turns match
4.  Low vibration and noise
5.  Power 10VA to 30KVA

D.  Temperature resistance and product temperature rise
Typically we design that over ambient of 25°C, product temperature rise is as follows:
1.  Class A: 105°C, Temperature rise below 60°C
2.  Class B 130°C, Temperature rise below 75°C
3.  Class F 155°C, Temperature rise below 95°C
4.  Class H 180°C, Temperature rise below 125°C
5.  Or suitable temperature grade and suitable temperature rise

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