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The development of condition monitoring strategies is necessary to ensure the efficiency and reliability of the operation on electric machines. The feature calculation is an important signal processing step used to obtain a characterization related to the working condition of machinery. In order to address this issue, this work proposes a diagnosis methodology based on the calculation of a statistical-time...
Vector controlled motor drives are widely used in industry application areas, usually they contain two current sensors and a speed sensor. A fault diagnosis and reconfiguration structure is proposed in this paper including current sensor measurement errors and sensors open-circuit fault. Sliding windows and special features are designed to real-time detect the measurement errors, compensations are...
A combined encoder and rotor-current-sensor fault detection and isolation algorithm for doubly-fed induction machines is presented. A rotor-position and current estimator based on air-gap power vector computation is used for residual generation. A cumulative-sum function permits detecting and isolating the investigated faults. The algorithm is experimentally tested on a 3 kW generator in steady and...
In this paper, a fault assessment of a multiphase permanent magnet generator designed for ‘more electric engine’ aeronautic applications is presented. The distribution of various electrical faults occurring in three-phase machines that is available in the literature helped the authors to identify the most probable fault types. The six-phase machine under observation is tested under these faults both...
Fault indicators signifying major failures in Synchronous machines (SM) are highlighted. A 15 megawatt (MW) SM was chosen in which, electro-mechanical faults were made by suitably altering physical disposition of machine parts. Finite element simulation of the motor model helped build signature for ideal and fault conditions in time and frequency domains for different fault indicators. Measurements...
Induction machines are widely used in industrial facilities as motors and increasingly in distributed generation, particularly in wind turbines. The short-circuit current contributed by induction machines in the first cycle following a fault outside the machine can be significant, and common practices for calculating these currents are well established. However, experimental short-circuit tests described...
The inverter fed induction machine is becoming one of the most important drive application due to speed variability, dynamics, and robustness. These advantages are possible by the development of high-power transistors. On the other side these fast switching components lead to steep voltage rises and high stress on the winding insulation of the machine. Faults in the winding system of a machine can...
Wind farm tie-lines need to complete the relay protection, but existing tie-lines, or not set protect at wind farm side, or the protection may be affected by wind farm characteristic and misoperation. This paper first analyzes the DFIG short circuit current characteristics; draw DFIG short circuit current be closely connected with fault time, fault modes, the Crowbar circuit whether action, voltage...
Negative sequence current monitoring is a well-known application that capable of identifying stator faults in induction motor using a simple measurement technique. However, the technique is sensitive to other asymmetrical sources of negative sequence, faults or disturbances. This paper addresses the issues on negative sequence condition monitoring based on such sources. The paper provides a comprehensive...
Externally excited synchronous machines exceptionally suit the needs of axle drives in automotive applications due to their high efficiency over the whole operation range and the advantages for the realization of the functional safety. With the rotor current giving an additional degree of freedom new possibilities and necessities come up, bearing special challenges regarding the control. A loss minimum...
This paper deals with the study of interturn short circuits in rotor windings of a synchronous generator using FEM. Results obtained for magnetostatic and magnetodynamic cases are presented and discussed.
Field oriented control schemes may use different methods for the acquisition of the orientation angle and can operate with or without encoder. In this work the usual variants of field oriented control are implemented and the viability of making the detection and diagnosis of incipient rotor asymmetries in the squirrel cage of induction machines (IMs) is discussed. Then, the utilization of an online...
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