On-load adjustable-capacity transformer body structure

Abstract

The invention relates to an on-load adjustable-capacity transformer body structure which comprises a low-voltage winding in a four-layer cylindrical structure. In the low-voltage winding, one layer includes common part upper terminals and common part lower terminals, and the other three layers include series and parallel part upper terminals and series and parallel part lower terminals; the commonpart upper terminals and the series and parallel part upper terminals are connected with a switch on the upper side of a transformer body through copper bars or cables; the common part lower terminals and the series and parallel part lower terminals are led above the transformer body through copper bars or cables to be connected with the switch on the upper side; the copper bars or the cables arefixedly clamped through conductor grips. The on-load adjustable-capacity transformer body structure has advantages that each of the upper and lower portions of the whole low-voltage winding is provided with two groups of terminals, and influences on winding axial stability due to looseness and resilience under the short circuit electro-dynamic action because of terminal stress concentration are avoided; by the conductor grips for segmental clamping, deformation and displacement of leads are avoided, and accordingly integral mechanical strength is improved.

Description

technical field [0001] The invention relates to the field of transformer design and manufacture, in particular to a body structure of an on-load capacity regulating transformer. Background technique [0002] The on-load capacity regulating transformer is a distribution transformer with two types of rated capacity, and the two capacities can be automatically converted. The transformer adopts high-voltage winding Y-D conversion, low-voltage winding series and parallel conversion methods, and realizes automatic adjustment of transformer capacity through on-load capacity adjustment switches. Due to the series-parallel connection requirements of low-voltage windings, the number of turns of the windings is divided into two parts, with a total of 4 heads. It is difficult to realize the space layout by using copper foil winding. One outlet is located at the lower part of the winding, and the other three outlets are located at the upper part of the winding. However, due to the larg...

AI Technical Summary

Problems solved by technology

However, due to the large cross-section of the winding wires, the large number of parallel connections, and the concentrated stress at the head of the transformer, under the action of short-circuit electrodynamic force, the upper head of the transformer is easy to loosen and rebound, resulting in axial deformation and instability of the winding.

Images