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Regularity and Mode of Voltage Distribution of Dry-type Transformer

time:2019-02-12 10:30:00 Author:bianji

Dry-type transformers have many problems to pay attention to when they are working. The most important one is the current and voltage of dry-type transformers, which need to be carefully understood.

Dry-type transformers have many problems to pay attention to when they are working. The most important one is the current and voltage of dry-type transformers, which need to be carefully understood. Dry-type transformers have various distributions of voltage. Voltage controls the operation of the whole system, and even plays an important role in the circuit. The voltage distribution of the dry-type transformer is the main factor to stabilize the performance of the dry-type transformer. The voltage distribution of dry-type transformer is more scientific and reasonable, so the voltage distribution of dry-type transformer can not be ignored.

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The electromagnetic design of the converter carries out the electromagnetic design of the dry-type transformer according to the product technology and performance parameters stipulated in the tender and contract agreement, and determines the main dimensions and electromagnetic loads of the product. Short-circuit impedance calculation is an important performance parameter of dry-type transformer. It determines the change of voltage and current of dry-type transformer under load conditions, and it is also the condition of parallel operation of dry-type transformer. Therefore, accurate calculation of short-circuit impedance of dry-type transformer is of great significance to the operation of dry-type transformer. In large dry-type transformer, the short-circuit current is 8-10 times the rated current. Because the short-circuit force is proportional to the square of the short-circuit current, under the interaction of the leakage magnetic field of the short-circuit winding and the current in the winding, a great electric force will be produced on the winding turns, and the winding structure may be damaged by permanent deformation.
 
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In addition, the relative displacement of conductor insulation and other components of winding may damage insulation and lead to short-circuit of turns. Therefore, it is of great significance to accurately calculate the force of coils under short-circuit conditions. The calculation of short-circuit strength of coil is mainly to calculate the force distribution of each section of coil under short-circuit condition of dry-type transformer, and to check whether the mechanical strength of coil meets the requirements. The calculation of coil impulse voltage distribution requires high insulation for large dry-type transformers. In order to design insulation, it is necessary to know the voltage distribution in dry-type transformers. Dry-type transformer allows continuous working voltage not to exceed 5% of rated voltage. Overvoltage may occur during the operation of transformer. Overvoltage is mainly caused by operation failure or lightning stroke.
 
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The distribution process of the voltage of dry-type transformer is the above several. The distribution of the voltage of dry-type transformer should be grasped in general, so that the control and operation law of the voltage of dry-type transformer can be mastered.

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