Thermal equilibrium temperature-difference control method based on natural hot-pressing of long vertical enclosed busbar
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: 2015-10-28
CHANGJIANG SURVEY PLANNING DESIGN & RES
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[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 the 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, so the main thing that affects the temperature distribution of the IPB in the vertical direction is the convection of the internal and external air of the IPB.
[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 t...
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The invention discloses a thermal equilibrium temperature-difference control method based on the natural hot-pressing of a long vertical enclosed busbar. The interior temperature difference delta T of the long vertical enclosed busbar, the intensity Q of a heat source, and the vertical height H of the busbar satisfy the following relationship of delta T=a1+a2*H+a3*q+a4*H2+a5*q2, wherein a1 represents a first coefficient, a2 represents a second coefficient, a3 represents a third coefficient, a4 represents a fourth number and a5 represents a fifth coefficient. According to the invention, the numerical calculation and the field measurement are conducted on the thermal equilibrium state and the temperature distribution state of the long vertical enclosed busbar (namely an isolated phase bus, IPB) in the natural ventilation state are conducted for comparative study. In this way, the temperature distribution rule and the temperature distribution characteristics of the long vertical enclosed busbar in a strong heat source restricted space in the natural ventilation state are obtained. Therefore, the temperature-difference control of the IPB during engineering is ensured, and the thermal equilibrium mode can be correctly selected. The temperature distribution for the safe and reliable operation of the IPB is ensured, and an advanced and reliable guidance is provided for the selection of the heat dissipation mode.
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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Login to View More 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