High-capacity double-body split on-load voltage-regulating transformer

Abstract

The invention relates to a high-capacity double-body split on-load voltage-regulating transformer belonging to the technical field of transformers. The technical scheme is as follows: two transformer bodies (1, 2) which are same in structure are arranged in a transformer oil tank, namely two triphase double-coil on-load voltage-regulating transformer bodies each of which has capacity equal to half of total capacity are positioned in one oil tank and are arranged in parallel from front to back along the short shaft direction of the transformer; the high voltage of the transformer is subjected to on-load voltage regulation, and the low voltage is split into two low voltage windings (3); the low voltage windings of two central pillars on each body are respectively led outsides; the two triphase low voltage windings are respectively formed into two corniform links; a high voltage winding (4) and a voltage regulating winding (5) of the two central pillars on each body are led outsides after being connected in parallel; and the triphase high voltage winding is a stratlike link. According to the high-capacity double-body split on-load voltage-regulating transformer, the mechanical force of the high-capacity split transformer when in a sudden short circuit can be effectively reduced, the short circuit damage of the transformer caused by asymmetric ampere turns in half-penetrating short circuit is avoided, and the safety and the reliability in production operation are enhanced.

Description

technical field

[0001] The invention relates to a large-capacity double-body split on-load voltage regulating transformer, which belongs to the technical field of transformers. Background technique

[0002] The on-load tap-changing transformer can be used as a large-capacity start-up / standby transformer in a power plant. Background Art This type of transformer adopts a three-phase axial double-split on-load tap-changing structure. The existing problems are: the mechanical force of the large-capacity split transformer is too large when there is a sudden short circuit. In the case of a half-through short circuit, due to the asymmetry of the ampere-turn, it is easy to cause short-circuit damage, and the safety and reliability of the product operation are poor; there is an interruption gap in the middle of the winding. The force of the wire cake here is uneven, the risk of short-circuit axial instability is high, and the safety performance is poor. Contents of the invention ...

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