A 66kv sudden short-circuit transformer

Abstract

The invention relates to a 66kV sudden short-circuit transformer. A three-phase three-column iron core is arranged in the lower fuel tank of the transformer. A low-voltage coil and a high-voltage coil are sheathed on the iron core. , into the sleeve through the cable; the high-voltage coil adopts a fully continuous structure, and the three-combined wires are radiated to two parallel windings; the high-voltage and low-voltage side secondary pressure plates are all fan-shaped secondary pressure plates, and the high-voltage and low-voltage side fan-shaped secondary pressure plates are the same circle center, Placed symmetrically; the auxiliary pressure plate and the pressure plate have positioning holes and are connected by insulating screws. The invention optimizes the insulation structure of the coil, improves the ampere-turn balance of the coil, reduces the transverse eddy current loss of the coil on the premise of ensuring the reliability of the insulation, greatly reduces the stress level of the coil during short circuit, and improves the short circuit resistance of the product. Provide a basis for optimizing product design.

Description

technical field [0001] The invention relates to a transformer manufacturing technology, in particular to a 66kV sudden short-circuit transformer. Background technique [0002] With the continuous expansion of the system capacity and the capacity of a single transformer, under the condition of a certain short-circuit impedance of the transformer, the threat of short-circuit electromagnetic force to the transformer will be more serious. In order to ensure the safe and reliable operation of the transformer, it is necessary to try to improve the short-circuit resistance of the transformer winding. However, the operation practice of my country's electric power sector in recent years has shown that no matter whether it is a transformer produced by a domestic manufacturer or a transformer imported from a foreign manufacturer, under the impact of short-circuit electromagnetic force, there are still many accidents that are damaged due to insufficient short-circuit resistance of the w...

AI Technical Summary

Problems solved by technology

However, the operation practice of my country's electric power sector in recent years has shown that no matter whether it is a transformer produced by a domestic manufacturer or a transformer imported from a foreign manufacturer, under the impact of short-circuit electromagnetic force, there are still many accidents that are damaged due to insufficient short-circuit resistance of the winding. occur

Analyzing the previous transformers, in terms of structure, the axial compression of the yoke corresponding to the winding part is the most unreliable, and the wire cake at this part is often difficult to achieve the proper pre-tightening force, so the wire cake at this part is most easily deformed

And because the axial force is too large or the strength and rigidity of the end support are not enough, or the assembly is defective, the winding rises and the pressure plate is stretched apart.

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