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Experiences in identification of partial discharge patterns in large ...

Experiences in identification of partial discharge patterns in large ...

Experiences in identification of partial discharge patterns in large

21, rue d'Artois, F-75008 Paris http://www.cigre.org A1-209 Session 2004 © CIGRÉ EXPERIENCES IN IDENTIFICATION OF PARTIAL DISCHARGE PATTERNS IN LARGE HYDROGENERATORS CARLOS AZUAJE* WILLIAM TORRES C.V.G. ELECTRIFICACIÓN DEL CARONI, C.A. (EDELCA) (Venezuela) SUMMARY In this paper some experiences on partial discharge (PD) pattern identification in hydrogenerators from 103 to 805 MVA at the Guri and Macagua II power stations in Venezuela are presented. Visual inspections and measurements were carried out for partial discharge pattern identification in several different generators. In addition to these results, simultaneous measurements of on-line partial discharges were performed with vibration measurements on the stator core and frame under different operating conditions. Ozone concentration was also evaluated. Since slot discharges are directly relates with movement in slots and to determine how load conditions would affect magnetic forces over stator bars and their movement on the slot, simulations by FEM were performed. Keywords: Hydrogenerator – Stator winding – Electrical Insulation – Partial discharge – TVA antenna –MEF. 1. INTRODUCTION Guri and Macagua II are the second and third hydroelectric projects constructed by EDELCA on the Caroní river, and together with Caruachi and Tocoma projects, now under construction, they conform the hydroelectric complex of the lower Caroní. Guri comprises two powerhouses that consist of 20 vertical shaft generators of the order of 185 to 805 MVA at 18 kV. Macagua II comprises two powerhouses with a total installed capacity of 2,540 MW. Powerhouse No. 2 consists of 12 vertical shaft generators of 250 MVA at 13.8 kV and powerhouse No. 3 of 2 generators of 103 MVA at 13.8 kV. These generators operate under high electrical, mechanical, thermal and environmental stress due to high level of power that they handle. Therefore, their components deteriorate gradually because aging or degradation in their insulation system. The insulation used in most of these generators is of mica impregnated with resins epoxi, except three generators of 230 MVA at Guri plant that use insulation mica-polyester and six generators of 60 MVA of Macagua I are of compound asphaltic. *cazuaje@edelca.com.ve 1

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