Three-phase dry transformer for motor train unit auxiliary system

Abstract

The invention discloses a three-phase dry transformer for a motor train unit auxiliary system, and the transformer comprises an iron core and a main coil arranged on the periphery of the iron core ina winding mode; the iron core comprises a main iron core body and an auxiliary iron core body, the main coil comprises a low-voltage winding and a high-voltage winding, and the main iron core body comprises a main iron core column and a main iron yoke connected with the main iron core column. The auxiliary iron core comprises an auxiliary iron core column and an auxiliary iron yoke connected withthe auxiliary iron core column, the low-voltage wire is wound on the main iron core column to form a low-voltage winding, the high-voltage wire drives the auxiliary iron core column to be wound on thelow-voltage winding at the same time to form a high-voltage winding, and the high-voltage winding and the low-voltage winding comprise a plurality of transposition copper wires which are wound in parallel; and the lengths of the transposed copper conductors which are arranged in parallel are the same. By means of the mode, the three-phase dry-type transformer for the auxiliary system of the motortrain unit can reduce the thickness of a single wire, meanwhile, the chance that each wire is located in a leakage magnetic field is equal, circulation between the wires is reduced, harmonic loss isreduced, and the overall harmonic loss can be reduced by 80%.

Description

technical field [0001] The invention relates to the technical field of three-phase transformers, in particular to a three-phase dry-type transformer used in an auxiliary system of an EMU. Background technique [0002] The auxiliary power supply system of the EMU can provide all electric energy except traction for the train. In order to ensure the long-term operation of the EMU, the train needs a safe, stable and efficient auxiliary system to provide power for many auxiliary equipment. The load equipment of the auxiliary system mainly includes: air conditioner, cooling fan, compressor, lighting, charger, control system, etc. The auxiliary system is not only related to the comfortable environment of passengers, but also a very important and effective guarantee for the safe operation of trains. [0003] As the core component of the auxiliary power supply system, the three-phase dry-type transformer is mainly used to convert the output voltage of the converter to the 380V worki...

AI Technical Summary

Problems solved by technology

However, after connecting to the power supply of the EMU converter, the transformer loss and temperature rise will increase rapidly

Excessive loss and temperature rise will reduce the operating efficiency of the system, high temperature fault warning, and even burn the transformer

In order to ensure the safe operation of the train, it is necessary to limit the use of the load and reduce the power in some cases, which seriously affects the passenger experience

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