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1 Journal of New Technologies in Environmental Science

1 2020

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Research of the question of increase of efficiency of cooling of the power equipment of hydroelectric power plants

Cheilytko Andrii, Ilin Sergii

Journal of New Technologies in Environmental Science

2020

Vol. 4, nr 1

22--29

Improving the cooling efficiency of power transformer windings with a cross-sectional width of the radial channel less than 3 mm, by improving the geometric parameters of the cooling system while reducing the material consumption of the electric machine is an important area of research. Excess oil pressure in the winding channels increases with increasing serial number of the coil. It was found that with increasing oil velocity at the inlet to the horizontal channel, the values of excess pressure in it increase in quadratic degree. It is established that a lifting force occurs in the oil of the horizontal channel, as evidenced by the increase in excess pressure near the upper boundary of the channel. For the first time, an analytical dependence of the excess oil pressure in the radial channel of the disk winding of the power transformer on the oil flow rate at the inlet to this channel was obtained. The dependences of the excess pressure in horizontal channels with a cross-sectional width of 1 mm on the velocity of oil at the inlet to this channel were obtained, which allows to calculate the speed by which it is possible to organize through circulation of oil in the channel provided that excessive pressure in the channel is prevented. situations. A new mathematical model of interconnected heat exchange and hydrodynamic processes in the disk windings of a power transformer is proposed, which, unlike the existing ones, takes into account the width of the horizontal channel less than 3 mm, which allows to predict the heat distribution in the winding and determine possible locations overheating of coils and premature destruction of insulating materials.