Till now, the primary and secondary winding is fixed but in case of an auto-winding transformer, the primary and the secondary coil can be connected in series and the center tapped node is movable. An isolation transformer could convert a 480 supply voltage to 400V but the additional isolation would be redundant and expensive. Principle of Autotransformer In an autotransformer, the primary and secondary share one continuous winding. Step Down Autotransformer. Autotransformers are different from traditional transformers because autotransformers share a common winding. Variable auto transformers are used in the laboratory and industry to provide a wide range of ac voltages from a single source. The applications of an auto transformer include: Compensating voltage drops by boosting supply voltage in distribution systems. There are two types of auto transformer based on the construction. The transformer can be classified using winding orders. These transformers are usually smaller in size compared to power transformers. Auto Winding transformer. Go back to contents ↑ 2. Go back to the previous page. With respect to the unique features of tap changing transformer, auto transformer and distribution transformers are generally belongs to the family of power transformers. This auto transformer is an improved version of the original transformer. Based on the type of winding technique, we have another transformer which is very popular named as the Auto transformer. There are following uses of auto transformer.... 1) Testing a repaired electronic device. The working principle of autotransformer and construction is similar to that of conventional two winding transformers.However, it differs in the way in which the primary and the secondary are inter-related. In a two-winding transformer, primary and secondary are only magnetically linked by a common core but are completely insulated from each other.. Some power transformers are discussed below. Different Types of Transformer. Large or important transformer infeed. The above figures show step-up and step-down autotransformers. Single phase autotransformers, as their name suggests, operate with single phase voltage. A ∆ – ∆ autotransformer connection is theoretically possible; however, this will create a peculiar phase shift. Copper Saving In Autotransformer: … Figure 1 – Small transformer infeed protection scheme. Relay 7UT612 provides numerical ratio and vector group adaptation. Matching transformers as used with traditional relays are therefore no longer applicable. An auto-transformer would perform the voltage conversion for a fraction of the cost of the isolation transformer, in a package which would be approximately two thirds smaller. This winding is tapped at the required point(s) to get the voltage(s) required. The transformer can be classified using winding orders. Till now, the primary and secondary winding is fixed but in case of an auto-winding transformer, the primary and the secondary coil can be connected in series and the center tapped node is movable. The figure below shows an image of a distribution transformer. This phase shift cannot be changed or eliminated and for this reason, autotransformers are very seldom connected as ∆ – ∆ transformers.

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