Transformer with split winding made of special cable winding

Abstract

The invention discloses a split transformer made of a special cable winding, which includes an iron core and a winding, and is characterized in that the winding is made of at least one flexible cable. The flexible cable is a double-conductor flexible cable including inner and outer coaxial conductors, one conductor can form the primary winding of the transformer, and the other conductor can form the secondary winding of the transformer. In this way, two flexible cables can form three windings, in which the inner conductors of two cables are connected in series to form a high-voltage winding, and the outer conductors of two cables form two split windings, which are connected in parallel to form a split winding. In the present invention, the high-voltage winding and the split winding are tightly coupled, and the coaxial conductor arrangement makes the short-circuit impedance close to 0, which leads to improved electrical connection and better short-circuit mechanical capability, and the small stray magnetic flux leakage leads to small short-circuit force; no insulation is required Oil filling is safer, has less environmental pollution and does not have complicated insulation systems.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a split transformer made of special cable windings. Background technique [0002] In the power system, split transformers have become widely used as factory transformers and startups. Compared with general power transformers, it has many unique features. It has a parallel high-voltage winding and several split low-voltage windings, which are usually divided into two types: low-voltage winding axial split and low-voltage winding radial split according to the structure. Axial split transformer means that the low-voltage winding is split into two or more windings in the axial direction; radial split transformer means that two split windings are placed concentrically, and one is placed outside the other. The range of change is large. The two low-voltage windings of the split transformer can operate either in parallel with the unsplit high-voltage winding, or separately with th...

AI Technical Summary

Problems solved by technology

When the axial split transformer is in half-traversal operation, the ampere-turn imbalance caused by the uneven current distribution of the high-voltage winding is relatively serious. If a short-circuit fault occurs, the damage caused by the axial short-circuit electromotive force to the product will seriously threaten the safety of the transformer. Safe operation, and the split transformer is often used as a factory transformer, and the ratio of short-circuit faults is relatively large

Images