Stator winding fault diagnosis in three-phase synchronous and asynchronous motors, by the extended Park's vector approach

Abstract

This paper describes the use of the ExtendedPark's Vector Approach (EPVA) for diagnosing the occurrence of stator winding faults in operating three-phase synchronous and asynchronous motors. The major theoretical principles related with the EPVA are presented and it is shown how stator winding faults can be effectively diagnosed by the use of this noninvasive approach. Experimental results, obtained in the laboratory, corroborate that these faults can be detected, in the EPVA signature, by the identification of a spectral component at twice the fundamental supply frequency. On-site tests, conducted in a power generation plant and in a cement mill, demonstrate the effectiveness of the EPVA in the detection of stator circuit faults in large industrial motors, ratted up to 5 MW.

Power transformers winding fault diagnosis by the on-load exciting current Extended Park's Vector Approach

“…Firstly applied to diagnose AC motors faults, the so-called Extended Park's Vector Approach (EPVA) has been introduced in [25] in order to allow a more in depth characterization of the condition of rotating electric machines. This paper presents the integration of the on-load exciting current strategy with the EPVA to diagnose incipient winding insulation faults in operating three-phase transformers.…”

Overview of condition monitoring and operation control of electric power conversion systems in direct-drive wind turbines under faults

“…Partial discharge on-line monitoring systems Spectral analysis of stator current [12][13][14] Monitoring stator winding fault Judgment is not accurate, and it is related to load and power supply reliability Symmetrical component method [15,16] Monitoring of inter-turn short-circuit fault Insulation is not monitored Park vector analysis of stator current [17,18] Monitoring of inter-turn short-circuit fault Relationship between the ellipticity of the trajectory of (i d , i q ) and the fault is unclear…”

“…Park vector analysis of stator current Park vector analysis of the stator current can be conducted in inter-turn short-circuit fault monitoring [17,18]. Under normal conditions, the trajectory of (i d , i q ) is a circle.…”

Stator winding fault diagnosis in synchronous generators for wind turbine applications

“…1) Turn-to-turn fault in an EESG: In the case of an EESG with stator turn-to-turn faults, turn-to-turn faults can be detected by the presence of a spectral component at twice the fundamental supply frequency 2f , and the amplitude of this spectral component is directly related to the extension of the fault [10]. Other spectral components that can be observed in the stator line current are given by [11], [12].…”