Heat balance temperature difference control method based on natural hot pressing of long vertical closed bus
A technology of closed busbar and temperature difference control, which is applied in the direction of temperature control and cooling of busbar devices using electric methods, and can solve the problem of not giving busbar temperature and other problems
Active Publication Date: 2017-07-21
CHANGJIANG SURVEY PLANNING DESIGN & RES
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Problems solved by technology
[0004] In order to solve the problem that the current national standard does not specify the temperature difference along the length direction of the busbar, and the temperature of the shell and conductor of each part of the busbar is lower than the national standard and should be relatively balanced, the invention provides a long vertical closed busbar Heat balance temperature difference control method of natural hot pressing
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[0018] The present invention will be described in further detail below in conjunction with specific examples.
[0019] 1) Heat balance in IPB shaft
[0020] The heat dissipation of the IPB conductor is carried out through heat radiation between the conductor and the shell and air convection inside the shell, while the shell mainly dissipates heat through heat radiation and convection of air outside the shell. Thermal radiation is determined by the emissivity coefficient (which is a constant), and there is no difference in the vertical direction of the IPB. Therefore, it is mainly the convection of the internal and external air of the IPB that affects the temperature distribution of the IPB in the vertical direction.
[0021] P M =Q MF +Q MD
[0022] P M +P K =Q KF +Q KD
[0023] P M is the power loss of the conductor, W / (m phase);
[0024] Q MF Radiation heat dissipation for IPB to the shell;
[0025] Q MD For convective heat transfer between the conductor and th...
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The invention discloses a heat balance temperature difference control method based on natural hot pressing of a long vertical closed busbar. The internal temperature difference ΔT of the long vertical closed busbar, the heat source intensity q, and the vertical height H of the busbar satisfy the relational expression: ΔT=a 1 +a 2 *H+a 3 *q+a 4 *H 2 +a 5 *q 2 , where: a 1 is the first coefficient, a 2 is the second coefficient, a 3 is the third coefficient, a 4 is the fourth coefficient, a 5 is the fifth coefficient. The present invention conducts numerical calculation and on-site measurement and comparison research on heat balance and temperature distribution under the natural ventilation condition of strong heat flow and long vertical closed busbar (IPB) of large underground power station, and obtains the temperature distribution law and characteristics under the natural ventilation condition in the strong heat source confined space , to provide guidance for ensuring IPB temperature difference control, correct selection of heat balance methods, temperature distribution and advanced and reliable heat dissipation methods for safe and reliable operation of IPBs in projects.
Description
technical field [0001] The invention belongs to the electromechanical technical field of water conservancy and hydropower engineering, and specifically refers to a heat balance temperature difference control method based on natural hot pressing of long vertical closed busbars. Background technique [0002] The temperature distribution and heat dissipation of long vertical closed busbars in large underground power stations are the guarantee for the safe operation of busbars. With the rapid development of domestic hydropower projects, the application of long vertical isolated phase-enclosed busbars (IPB) in underground hydropower stations is becoming more and more extensive. However, there are no relevant design, manufacturing standards or regulations for IPBs with different capacities and vertical heights. The cooling method of various underground hydropower stations relies on natural ventilation for cooling. For example, Pengshui Hydropower Station and Shuibuya Hydropower S...
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IPC IPC(8): H02G5/10G05D23/19
Inventor 邵建雄梁波郭建辉毛永松李光华刘茂祥
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES