To ensure the operation reliability of relay protection devices in substations,by breaking through the limitations of the original thermal design and analysis merely based on experience,builds precise models of domestic core chips and printed circuit boards,and optimizes the layout of heat sources by using force-directed algorithm.The refined thermal analysis and experimental verification indicate that the optimized method improves the local hot spot and temperature gradient distribution of the pcb,increases the thermal safety margin of the domestic relay protection device,and reinforces the long-term operation reliability of the device on project site.
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