In an autotransformer, the common portion of the single winding acts as part of both the “primary” and “secondary” windings. The remaining. Auto-transformer Advantages: Auto-transformers in comparison with the double winding transformers are generally advantageous of the. ADVANTAGES OF AUTO TRANSFORMER STARTER: a) On the 65% tapping the line current is approximately equal tp that of a Star-Delta.

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Autotransformer Advantages and Disadvantages

Autotransformer is a transformer, common with a primary and secondary winding, which is common with a zero line, the transformation ratio have both fixed and adjustable.

Advantages Step-down starter of auto-transformer transformation ratio is fixed, contact the transformation ratio of voltage regulator is variable.

Autotransformer and General transformer of the same capacity ad comparison, has a simple structure, the materials used, the advantages of small size. Especially in the occasion seem special economic of the transformation ratio is close to 1, so the voltages used by similar high-power transmission transformers more, in addition to the above kilowatt are widely used in the asynchronous motor starter.

However, due to the secondary winding aurotransformer common at the beginning of a winding, autotransgormer contacts, and therefore should not be used on certain occasions, especially lamp transformers cannot be used as a row. Therefore, the comparison of two-winding autotransformer and General transformer has the following advantages.


Because transformer silicon steel sheet and copper is and an inductive winding rated voltage and rated current, and related to the capacity of the winding, autotransformer winding capacity reduced material consumption is reduced, and low cost.


Due to the amount of copper and Silicon reduction in the same current density and magnetic flux density, the autotransformer of copper and iron-loss is lower than a two-winding transformer, so effective. Since it is the same capacity of two-winding transformer light weight, small size, covering an area of small. Transformers limited general conditions of transport manufacturing capacity constraints, limitations in the same conditions of transport, under the same conditions of carriage, autotransformer autotransformwr larger than the two-winding transformer manufacturing.

Disadvantgaes Autotransformer in electric system, will also have a negative impact. Its shortcomings are as follows: And because of autotransformer neutral grounding must be directly, so the single-phase short-circuit current of the system increased considerably, sometimes even over three-phase short-circuit current.

Largely because of its high and medium voltage winding autotransformer due to electrical contact may surge in three ways, the first is internal autotransformer winding installation changing the position of head pressure regulating device with load; the second is the high-voltage and medium-voltage lines to install additional transformers. These three methods are not only manufacturing difficulties, not economic, and also has disadvantages in the running such as the third windings of voltagethe disadvantqges is less than ideal.


Due to the high and medium voltage winding autotransformer links on autotransformmer side into a band and when the level of the winding insulation of lightning, appeared on the other side of the overvoltage amplitude may exceed the insulation level. In order to avoid the occurrence of this auttransformer must be high, medium voltage on both sides of the outlet side can one set of valve type arrester.

Autotransformer has certain disadvantages, but also attach great importance to application of autotransformer, primarily with the power autotransormer to the development of large capacity and high voltage are inseparable, as capacity increases, the voltage increases, the advantages of auto-transformer is even more significant.

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