What is the surface heat transfer coefficient of a switchgear cabinet?

The switchgear cabinet surface is set as the third boundary condition, with surface heat transfer coefficient h = 10 W/ (m 2 ∙K). Surface-to-surface radiation occurs between the conductive circuit, insulated component, and the cabinet wall, where the conductive circuit surface emissivity is ε2 = 0.5.

Can high-voltage switchgear improve the reliability and safety of power supply?

In order to improve the reliability and safety of power supply and reduce the failure rate of switchgear, this paper designs a novel high-voltage switchgear which is reliable and safe.

Does the insulation and temperature rise design of switchgear meet national standards?

In order to check whether the insulation and temperature rise design of the switchgear meets the requirements of national standards, a simulation model of electric field and temperature field is established. According to the results, optimized design of insulation and temperature rise was carried out. 2. New switchgear design

How does the cooling efficiency of the switchgear depend on convection heat dissipation?

As can be seen in Eq. (20), the cooling efficiency of the switchgear depends on the convection heat dissipation and the fan power. In this paper, the German ebmpapst A2E200-AI38-01 axial fan is selected, and its corresponding power curve is shown in Fig. 10.

Can a switchgear temperature rise under natural convection?

It was found that the temperature rise of the switchgear cannot reach the IEEE standard (temperature rise less than 65 °C) under natural convection, and forced convection must be adopted to ensure the safe operation of the switchgear.

How to improve the insulation of a switchgear?

It is determined that the connection and the corner is most likely to occur insulation problem, which the electric field is 1.23 × 10 6 V/m and 1.72 × 10 5 V/m respectively. Polishing connection and the corner is a good way to improve the insulation of the new switchgear.