The transformer

Autotransformer

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Description: Autotransformer (auto voltage regulator) is only one winding of the transformer, when used as a step-down transformer, extracted from the part of the winding turns as the secondary winding; when used as a step-up transformer when the applied voltage is ad

Autotransformer (auto voltage regulator) is only one winding of the transformer, when used as a step-down transformer, extracted from the part of the winding turns as the secondary winding; when used as a step-up transformer when the applied voltage is added only of the winding - part turns on. Usually belong to that part of the primary and secondary windings is called the common winding, and the remaining part is called the series winding, with the capacity of the transformer autotransformer compared with the ordinary, not only small size, and high efficiency, and the greater the capacity of the transformer, The higher the voltage. This advantage will become even more prominent. Thus, as the development of the power system, the voltage level of increase and the increase of transmission capacity, because of its large capacity autotransformer, low loss, low cost and has been widely used.
    Autotransformer (auto voltage regulator) features:
1 Since the autotransformer computing capacity is less than the rated capacity. Therefore, the same rated capacity, the main dimensions autotransformer smaller effective material (steel sheet and wire), and structural materials (steel) are reduced, thereby reducing costs. Effective material to reduce the copper loss and iron loss that is also reduced, so the higher the efficiency of the autotransformer. Same time as the main size reduction and quality is reduced, allowing the transport conditions can be manufactured under a single larger capacity transformer. But usually only in the autotransformer k ≤ 2, the above advantages became apparent. 2 due to the short-circuit impedance autotransformer pu smaller than the two-winding transformer, so the voltage change rate is small, but the short-circuit current is large. 3 due to autotransformer a secondary direct link between electricity, when the high pressure side over voltage will cause severe over-voltage low-voltage side. To avoid this danger, a secondary surge arresters must be installed, do not think a primary and secondary windings are connected in series, one has been installed, the second can be omitted. 4 in the general transformer. OLTC devices are often connected to the grounded neutral point, so that the voltage regulating device level can be lower than when the online side regulator. The autotransformer neutral point regulator side will bring the so-called regulator problem related. Therefore, the required load tap autotransformer, only using the line-side voltage mode.
    The working principle of autotransformer
1 autotransformer is the output and input share a set of coils of special transformers boost and buck with different tap to achieve. Fewer parts than a shared coil tap voltage is reduced. Than the more common part of the coil tap voltage on the rise high.
2 In fact, the same principles and common transformer, but his primary coil is its secondary coil of the transformer is generally left a primary coil through electromagnetic induction, so that the right side of the secondary coil produces voltage autotransformer affect their own.
The application autotransformer
My unit production OSZ9 type OLTC type autotransformer is mainly used for reactive power compensation, with a low loss, low impedance, short circuit capability and other advantages.

Counts:1480 Time:2013-05-27 16:12:36【Print】【Back

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