Dry-type vehicle-mounted traction transformer overload capacity evaluation factor calculation method

Abstract

The invention discloses a method for calculating an overload capacity evaluation factor of a dry-type vehicle-mounted traction transformer. Comprising the following steps: establishing a dry-type vehicle-mounted traction transformer overload capacity test platform, obtaining pressure data and temperature data under different load coefficients, calculating a pressure drop factor, calculating a temperature rise factor under different load coefficients, and calculating an overload capacity evaluation factor. And evaluating the overload capacity of the dry-type vehicle-mounted traction transformer under different load coefficients. The technical scheme of the invention has the advantages that aiming at the overload operation condition of the dry-type vehicle-mounted traction transformer, a brand new overload capacity evaluation factor calculation method is provided, accurate evaluation of the overload capacity of the dry-type vehicle-mounted traction transformer can be realized, and optimization design of the dry-type vehicle-mounted traction transformer is facilitated.

Description

technical field [0001] The invention relates to the field of electrical insulation on-line detection and fault diagnosis, in particular to a method for calculating an overload capacity evaluation factor of a dry-type vehicle-mounted traction transformer. Background technique [0002] In recent years, China's high-speed railway has developed rapidly. In order to provide traction power for trains, a large number of on-board traction transformers are widely used. At present, the oil-immersed traction transformer is widely used. Since the transformer oil is used as the cooling medium, the oil-immersed transformer has a large mass and there is a hidden danger of fire, while the dry-type traction transformer using the train wind generated by the train as the cooling medium is not The above-mentioned problems do not exist, and the energy efficiency of high-speed trains can be effectively improved. [0003] In the high-speed train power supply system with traction transformer as th...

AI Technical Summary

Problems solved by technology

When the train starts, the traction transformer will enter a short-term overload operation state. At this time, the winding loss is greater and the heat generation is higher, which will have a great impact on the insulation life.

For oil-immersed transformers, since the flow of transformer oil is usually laminar flow, the thermal characteristics are relatively regular, and there have been a lot of research results to evaluate the overload capacity of transformers; for dry-type transformers, especially dry-type Vehicle-mounted traction transformers, because the turbulent flow of wind in high-speed trains is more special and complex, there is still a lack of methods that can simply and quickly obtain the overload capacity of transformers

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