Power Engineer Journal
Year : 2020, Volume : 22, Issue : 1
First page : ( 11) Last page : ( 15)
Print ISSN : 2229-4465. Online ISSN : 0976-2396.

Simulation and Practical Testing of Substation Composite Post Insulators for Extreme Conditions-Results and Analysis

Venkataraman S., Jalan Vikas

Deccan Enterprises Limited, Hyderabad

Online published on 6 February, 2020.

Abstract

Design of high voltage station post insulators is critical in mechanical and electrical aspects considering wide variations of in-service conditions. In this context numerous simulations were carried out using Finite Element Modelling software (ANSYS) to understand the mechanical characteristics of deflection under static and dynamic load. Dynamic load simulations ware based on the forcing function model well defined in CIGRE publication. Simulation showed positive results with damping of the oscillations in a very short time highlighting the stability of composite post insulators.

To extend it further actual testing by the application of very high short circuit current was performed at a NABL, STL lab. The current levels for actual short circuit test was chosen to be much higher than the existing short circuit levels of substation for near futuristic possibilities. These laboratory tests were modelled and performed on the basis of actual substation arrangement of tubular bus bars with spacing between each composite post insulator and spacing of bus bars typical of a substation arrangement. The tests clearly demonstrated that composite post insulators are very stable during high forces created at times of short circuit with deflection levels very low under extreme fault levels ^[1–14].

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