Novel winding staggered type distribution transformer

Abstract

The invention discloses a novel distribution transformer. Structural advantages of an existing shell-type transformer and an existing core-type transformer are integrated, so an existing distributiontransformer can be completely replaced. The cost is greatly reduced, and the percent of pass of sudden short circuit tests is basically 100%. The transformer winding is good in cooling effect, high inoverload capacity, large in limit capacity and convenient to transport. The limit capacity is superior to that of a shell type. When vertical transportation is inconvenient, inverted transportation can be achieved, and the transportation height is reduced. The distribution transformer is compact in structure, small in appearance size, light in overall weight, uniform in capacitor distribution, reliable in insulation and high in lightning stroke resistance and operation overvoltage resistance, and leads are convenient to install.

Description

technical field [0001] The invention is a new distribution transformer, which is used to replace the existing distribution transformer. Background technique [0002] The distribution transformer is an important power equipment used in the power grid and power system. It is mainly composed of a core and a winding (the two form the transformer body). The winding is also called a coil. Distribution transformers are mainly core-type transformers with concentric windings. [0003] The basic structure of a distribution transformer is as follows: figure 1 As shown (three-phase), the cross-section of the core column is circular, the placement method is vertical, the cross-section of the coil is also circular, the high-voltage and low-voltage coils are concentrically sleeved on the core column in turn, the coil surrounds the core, and the coils are concentrically arranged. The cross-section of the core column is made of multi-level core sheets with different widths and thicknesses....

AI Technical Summary

Problems solved by technology

When the windings are staggered to protect the end of the non-core side (outside of the winding) of a certain winding end of the distribution transformer, in most cases it is not possible to use an anti-angular ring because the winding height of the distribution transformer is extremely short. When the outer corner ring is used, the entire winding will be covered, the transformer oil cannot flow, and the temperature rise of the winding will reach an unacceptable level

[0014] Secondly, if the winding interlaced distribution transformer and the shell-type transformer cancel the dihedral ring, the creepage distance along the surface must be increased by increasing the insulation distance between the ends of the two windings, resulting in a large increase in cost.

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