Summary
Proper sizing for withstanding in polluted conditions is one of the main challenges for HVDC installations: requirements from [1], Contractors and End-Users lead to an overall dimensioning liked to insulators creepage distance parameters rather than to dielectric withstanding need. As a result, insulators for this purpose are noticeably taller than the standard sizes for traditional porjects. On the other side, seismic requirements are becoming more and more severe in many countries worldwide: different classes are recalled in dedicated standards such as [2] & [3].
Read more Read lessDespite these are adopted in different geographical areas, the standards are reaching similar requirements such as the request of full-scale tests in structural and dynamic laboratories: this paper presents the return of experience from the sizing and seismic validation, through shakingtable test, of a ± 515 kVdc AIS (air insulated switchgear) disconnector.
This paper will detail the preliminary electrical and mechanical calculations performed to design this kind of equipment, resulting in a knee-type disconnector equipped with composite
HTM (hydrophobicity transfer materials) insulators. The latter choice is linked mainly to three aspects: improved pollution performance, benefits from seismic point of view and manufacturing process flexibility. This paper will then detail the steps followed to proper characterize the insulators from the mechanical point of view and the finite element method
(FEM) analysis prior to the seismic test. Finally, the paper will detail the test preparation and execution, focusing on the composite insulators benefits in high seismic areas, especially for successful HVDC projects with this kind of requirements.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B3_11101_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Italy |
| Study committees | |
| File size | 913 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
MOMESSO Davide - GE Vernova
Keywords
HVDC, composite insulators, creepage distance, seismic demand, finite element method.
