Single-phase box type transformer

Abstract

The invention provides a single-phase box type transformer. The single-phase box type transformer comprises a box body, a transformer, a backup protection fuse used for transformer short-circuit protection, a plugging and unplugging fuse used for transformer overload protection, a single-phase looped network load switch used for conversion of terminal power supply and looped network power supply, two groups of single-way bushings used for transformer high-voltage wire connection and three groups of low-voltage bushings used for transformer low-voltage wire connection. The transformer is connected in series with the plugging and unplugging fuse through a high-voltage tapping switch; the plugging and unplugging fuse is connected in series with the backup protection fuse; the backup protection fuse is connected in series with the single-phase looped network load switch; and the single-phase looped network load switch is respectively connected with the two groups of single-way bushings. Compared with a pole-mounting type single-phase transformer, the single-phase box type transformer enhances self-protection of a power supply circuit and the transformer and further improves the power supply quality. The single-phase box type transformer can be used for terminal power supply and looped network power supply, is very convenient in conversion, and guarantees reliability and flexibility of power supply.

Description

technical field [0001] The invention relates to a single-phase box-type transformer. Background technique [0002] A large number of scattered residential buildings, streets, roads, bridges and other power loads in foreign regions such as South and North America have the characteristics of small capacity. In order to reduce low-voltage power loss and voltage loss by being close to the load center, in such distributed power distribution In the network, a large number of small-capacity single-phase oil-immersed distribution transformers with certain self-protection functions are usually installed on the pole (the transformer capacity is generally 167kVA and below, and the voltage level is 20kV and below). However, due to the limitation of the protection of this type of pole-mounted single-phase transformer to itself and the power supply line, in addition, it is not suitable for use in more and more underground cross-linked cable systems in urban distribution networks. Conten...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the protection of this type of column-mounted single-phase transformer to itself and the power supply line, and it is not suitable for use in more and more underground cross-linked cable systems in urban distribution networks

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