Nuevo “sistema de desexcitación rápida para máquinas síncronas con excitación brushless” (HSBDS) en un generador de 15 MVA

Abstract

Synchronous machines with brushless excitation

have the disadvantage that the field winding

is no accessible for the de-excitation. 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 short circuit.

In this paper the test in a 15 MVA generator

of a novel high-speed de-excitation 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.

The main novelty of this paper is the use of this

method in a industrial size machine. This system

has been validated through experimental tests

on a 15 MVA generator, with satisfactory results.