HIGH CL POWER FACTOR INFLUENCED BY HIGH RESISTANCE OF THE CORE LAMINATION INSULATION

This month’s Featured Technical Paper is from the Proceedings of the 2021 International Conference of Doble Clients. The paper is titled: High CL Power Factor Influenced by High Resistance of the Core Lamination Insulation.
 
Abstract

In the last two years, one could observe an increase in the CL insulation power factor, typically reaching up to 0.5-0.6%. This was taking place despite low values of CH and CHL power factors, remaining in the 0.2-0.35% range. It became especially noticeable on several units built for Manitoba Hydro and a few other projects. The investigation linked this phenomenon to high resistivity of the core lamentations’ insulation, reaching 300-10000 Ω cm2, resulting in very high, 105-106 Ω core step resistance in several core steps. The paper will discuss the investigation of the problem, discuss the results, propose a theory behind this phenomenon and suggest a few mitigation methods.

 
Doble Service Agreement Clients
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