Novel approach to alternator field winding interturn fault detection

Control of Orientation of Pb(Zr, Ti)O3 Thin Films Using PbTiO3 Buffer Layer

“…Most of the approaches are based on hardware, functional and analytical redundancy [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The approach of hardware redundancy corresponds to incorporating redundant physical subsystems (for example, multiple sensors) into the system being 0957-0233/00/030178+07$30.00 © 2000 IOP Publishing Ltd developed [2].…”

“…The interdependence amongst the various sensor outputs or between the output of a sensor and the output of its model is called 'analytical' (or 'functional') redundancy and can be used to detect faults that may occur in a sensor. Most of the methods mentioned above tend to focus on systemlevel fault detection by exploiting multisensor integration and fusion [6,7] and utilizing voting [8], expert-system [9,10], fuzzy-logic [11,12] and neural-network approaches [13,14]. A disadvantage of these methods is that detection of the faults in an individual measurement device is disregarded, making the operational fault-detection schemes to some extent incomplete or unreliable at the system level.…”

Intelligent fault diagnosis of synchronous generators

“…Several researchers have worked on condition monitoring of synchronous generators (Auckland et al, 1995;Batzel & Swanson, 2009;Bruzzese, Giordani, & Santini, 2008;Penman & Jiang, 1996;Tavner, 2008). In synchronous generators, short circuit faults may happen in stator winding and field winding coils.…”

Condition monitoring of brushless three-phase synchronous generators with stator winding or rotor circuit deterioration

“…where the first terms in (4)-(6) are the normal 60-Hz positive sequence voltages that are due to the constant component of B1 while the second and third terms are a result of the 120-Hz component in (3). Note that the third harmonic (180-Hz) elements in (4)-(6) are a set of balanced positive-sequence voltages.…”

“…Some of the on-line approaches that have previously been proposed to detect deterioration of the generator field winding include the use of air gap search coils, measurement of circulating stator currents, twin signal sensing, field current monitoring, and measurement of shaft voltages [1][2][3][4][5][6][7][8][9][10][11]. On-line techniques that have been proposed for detecting armature winding ground and phase faults include field current monitoring, measurement of third harmonic voltages and artificial neural networks [1,[12][13][14][15][16][17][18].…”