Traction transformer winding temperature rise and oil flow speed relevance testing method

Abstract

The invention discloses a traction transformer winding temperature rise and oil flow speed relevance testing method. The traction transformer winding temperature rise and oil flow speed relevance testing method comprises the following steps of (1) testing temperature rise of a winding of a transformer under different loads and oil flow speed at the position of an outlet of a heat sink under the condition that environment temperature and heat dissipation conditions are not changed, and calculating a fitting function of the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink; (2) changing the environment temperature under the condition that the loads and the heat dissipation conditions are not changed and calculating an influence coefficient of the environment temperature on the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink; (3) changing the heat dissipation conditions of the heat sink under the conditions that the load and the environment temperature are not changed and calculating an influence coefficient of the heat dissipation conditions on the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink; (4) determining a modified function of temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink under various influence factors; and (5) determining temperature rise of the winding on the basis of a determined fitting function of the oil flow speed and the temperature rise of the winding in regard to the oil flow speed at the position of the outlet of the heat sink. By the traction transformer winding temperature and oil flow speed relevance testing method, a reliable testing platform can be provided for research of temperature rise of the winding of the energy-saving type traction transformer, and the temperature rise of the winding can be measured in real time on the basis of a determined relevance curve.

Description

technical field [0001] The invention belongs to transformer research and experiment equipment, in particular to a method for testing the correlation between the temperature rise of a traction transformer winding and the speed of oil flow. Background technique [0002] High-speed and heavy-haul railways are an important way to improve the efficiency of railway transportation. In recent years, with the increase in demand for railway transportation capacity due to economic development, high-speed and heavy-haul railways have developed rapidly. At present, the total mileage of China's high-speed rail has reached 12,000 kilometers, and the 30-ton axle load and heavy-haul railway has also been completed. With the high-speed and heavy-duty of electrified railways, the loss of traction transformers during operation also increases. While causing a huge loss of electric energy, the internal heating of traction transformers is also becoming more and more serious. The safe operation of...

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Problems solved by technology

The direct measurement method is to embed a temperature sensor inside the transformer winding to directly measure the temperature, which will increase the production cost, and the strong magnetic field generated by the time-varying large current will affect the measurement accuracy of the temperature sensor. Insulation performance puts forward higher requirements

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