NEW HIGH SPEED DE-EXCITATION SYSTEM FOR BRUSHLESS SYNCRHONOUS MACHINES IN A 15 MVA GENERATOR

EMILIO REBOLLO LOPEZ; FRANCISCO RAFAEL BLANQUEZ DELGADO; CARLOS PLATERO GAONA; FRANCISCO BLAZQUEZ GARCIA; JOSE ANGEL MARTINEZ RUEDA; IÑAKI ARETXEDERRA GALARZA

doi:https://doi.org/10.6036/7136

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NEW HIGH SPEED DE-EXCITATION SYSTEM FOR BRUSHLESS SYNCRHONOUS MACHINES IN A 15 MVA GENERATOR

NOVEMBER 2014 - Volume: 89 - Pages: 642-648

DOI:

https://doi.org/10.6036/7136

Authors:

EMILIO REBOLLO LOPEZ - FRANCISCO RAFAEL BLANQUEZ DELGADO -

CARLOS PLATERO GAONA

- FRANCISCO BLAZQUEZ GARCIA - JOSE ANGEL MARTINEZ RUEDA - IÑAKI ARETXEDERRA GALARZA

Disciplines:

Electrical technology and engineering (MAQUINARIA ROTATORIA )

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Received Date : 8 April 2014

Reviewing Date : 14 July 2014

Accepted Date : 19 July 2014

Key words:: Maquina síncrona, Generación energía eléctrica, Sistema de excitación, Excitación Brushless, Protecciones de generador.Synchronous generator excitation, AC generator excitation, Brushless rotating machines, Synchronous machines, Generator protection.
Article type:: ARTICULO DE INVESTIGACION / RESEARCH ARTICLE
Section:: RESEARCH ARTICLES

Synchronous machines with brushless excitation have the disadvantage that the field winding is no accessible for the deexcitation. This means that, despite the proper operation of the protection system, the slow de-excitation time constant may produce severe damage in the event of an internal or external short circuit.
In this paper the test in a 15 MVA of a novel high-speed deexcitation system for brushless synchronous machines is presented. The de-excitation is achieved by inserting a resistance in the field circuit, obtaining a dynamic response similar to that archived in machines with static excitation.
This system has been validated through experimental tests on a 15 MVA industrial type generator, with satisfactory results.

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