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Keywords

tulip contact, temperature rise, multiphysics coupling, empirical formula, contact degradation

Abstract

Tulip contacts are widely used in power systems due to their high reliability. However, with the increase of operation years and the cyclic variation of boundary loads, their contact parts are prone to degradation, leading to overheating faults. Temperature rise, as a key parameter characterizing the evolution of thermal faults, is commonly used to monitor the contact state of switchgear. The GC 5-630 tulip contact is taken as the research object. A three-dimensional electro-thermal-mechanical multiphysics coupling model is established based on the finite element analysis method to analyze the influence laws of different factors on the temperature rise of the contact parts, and a total of 180 sets of relationship data between contact temperature rise and multiple factors are obtained. Based on the simulation data, an empirical formula for predicting the contact temperature rise is fitted, and the effectiveness of the formula is verified through experiments. The research results indicate that the temperature rise has a power function relationship with current, roughness, and contact pressure, and the exponents are 1.97, 0.315, and −0.46, respectively. When the docking angle is 2°, contact failure occurs in the contact, and the temperature rise of contact fingers increases significantly under poor contact conditions. This research provides a theoretical basis for the condition monitoring and fault early warning of tulip contacts.

DOI

10.19781/j.issn.1673-9140.2026.03.030

First Page

332

Last Page

342

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