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.
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.
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.
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.
