| Advancements in Hydrostatic Testing Configuration for
Large-Tonnage High-Voltage Porcelain Insulators |
Yonggang Yue,a, b Song Fu,a
Yu Fan,c
Mingzhe Yi,a
Bin Caoa,* and Liming Wanga
Pages : 235-244
DOI: 10.1080/0371750X.2025.2541112 |
| Abstract |
| Porcelain insulators are essential for ensuring overhead transmission lines’
mechanical and electrical reliability, particularly in ultra high voltage (UHV) systems.
However, manufacturing defects can compromise their performance under operational
stresses. The internal hydraulic pressure test is a critical method for enhancing the
mechanical reliability of porcelain insulators. This study examines the effects of gasket
positioning, seal contact force, and contact location on stress concentration during
hydrostatic testing and discusses the methodology for selecting the optimal hydraulic
pressure load. Finite element simulations reveal that these factors significantly
influence stress distribution, particularly near the neck, where excessive stress may
lead to structural failure. Statistical analysis using the Weibull distribution suggests
that the optimal hydraulic pressure load should be chosen within a transition range
to effectively eliminate defective components while preventing excessive damage to
insulators. These findings provide theoretical guidance for optimizing hydrostatic
testing procedures, ultimately improving the reliability and performance of porcelain
insulators in high-voltage applications.
[Keywords: Hydrostatic test, Porcelain insulator, Ultra high voltage (UHV) systems,
Weibull distribution] |
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