Phase:Three Coil Structure:Toroidal, Toroidal Rated frequency:50Hz/60Hz Operating Temperature:-10℃–+50℃ Warranty:2 YEARS
An autotransformer is a transformer whose primary and secondary windings are on the same winding. The primary and secondary windings are directly connected in series and are self-coupled. According to the structure, it can be subdivided into adjustable pressure type and fixed type. Autocoupling is the meaning of electromagnetic coupling. Ordinary transformers transfer energy through the electromagnetic coupling of the primary and secondary coils. There is no direct electrical connection between the primary and secondary sides, and there is a direct electrical connection between the primary and secondary sides of the autotransformer. It is part of the high voltage coil. Protective devices such as autotransformers are also used in the protection of communication lines.
1) Less material consumption and low cost. Because the amount of silicon steel sheet and copper wire used in the transformer is related to the rated induced potential and rated current of the winding, that is, it is related to the winding capacity, the winding capacity of the autotransformer is reduced, the materials consumed are also reduced, and the cost is low.
2) Less loss and high efficiency. Because the amount of copper wire and silicon steel sheet is reduced, the copper loss and iron loss of the autotransformer are reduced compared with the double winding transformer at the same current density and magnetic flux density, so the benefit is higher.
3) Easy to transport and install. Because it is lighter, smaller in size and smaller in area than a double-winding transformer of the same capacity.
4) Increased the ultimate manufacturing capacity of the transformer. The ultimate manufacturing capacity of a transformer is generally limited by the transportation conditions. Under the same transportation conditions, the capacity of an autotransformer can be larger than that of a dual-winding transformer under the same transportation conditions.
⑴As the calculated capacity of the autotransformer is less than the rated capacity. Therefore, at the same rated capacity, the main size of the autotransformer is smaller, and the effective materials (silicon steel sheets and wires) and structural materials (steel) are correspondingly reduced, thereby reducing costs. The reduction of effective materials results in a corresponding reduction in copper and iron consumption, so the efficiency of the autotransformer is higher. At the same time, due to the reduction in main size and quality, a single transformer with a larger capacity can be manufactured under allowable transportation conditions. But usually only when k≤2 in the autotransformer, the above advantages are obvious.
⑵ Because the short-circuit impedance standard value of the autotransformer is smaller than that of the double-winding transformer, the voltage change rate is small, but the short-circuit current is large.
(3) As there is a direct electrical connection between the primary and secondary of the autotransformer, when the overvoltage on the high voltage side causes serious overvoltage on the low voltage side. In order to avoid this danger, lightning arresters must be installed for the first and second times. Do not think that the primary and secondary windings are connected in series. Once installed, the secondary can be omitted.
⑷ In general transformers. On-load voltage regulators are often connected to a grounded neutral point, so that the voltage level of the voltage regulator can be lower than when the line is regulated. The neutral voltage regulating side of the autotransformer will bring about the so-called related voltage regulating problems. Therefore, when the on-load voltage regulation of the autotransformer is required, only line-side voltage regulation can be used.
1. An autotransformer is a special transformer that shares a set of coils for output and input. Step-up and step-down are implemented with different taps. The voltage of the part with less than the common coil is reduced, and the voltage of the part with more than the common coil is increased. high.
2. In fact, the principle is the same as that of an ordinary transformer, except that its primary coil is its secondary coil. Generally, a transformer uses a primary coil on the left to generate voltage through the secondary coil on the right. The autotransformer affects itself.
3. An autotransformer is a transformer with only one winding. When used as a step-down transformer, draw a part of the turns from the winding as a secondary winding. When used as a step-up transformer, the applied voltage is only applied to the winding-part On the turns. Generally, the part of the winding that belongs to both the primary and secondary is called the common winding, and the rest of the autotransformer is called the series winding. Compared with the ordinary transformer, the autotransformer with the same capacity is not only small in size but also highly efficient. The larger the capacity, the higher the voltage. This advantage is even more prominent. Therefore, with the development of the power system, the improvement of the voltage level and the increase of the transmission capacity, the autotransformer is widely used due to its large capacity, small loss and low cost.
Autotransformers are used in applications where primary and secondary isolation are not required. They have the advantages of small size, few consumables, and high efficiency. Common AC (manual rotation) voltage regulators, transformers in small household AC voltage regulators, transformers in three-phase motor autocoupling decompression starters, etc., are all examples of autotransformer applications.
With the rapid development of power systems towards large capacity and high voltage, autotransformers are widely used in high-voltage power networks due to their low cost and high efficiency, and have become voltage conversion equipment that transmits important electrical energy. As one of the most important equipment in the high-voltage power grid, an autotransformer is of great significance for ensuring the safe and reliable operation of the power grid and the flexible distribution of electrical energy.