Investigating the effects of faulty induction machine in distribution systems

• Main Authors: Omonowo D. Momoh, Titus O. Ajewole, Matthew N.O. Sadiku
• Format: Article
• Language: English
• Published: Elsevier 2020-09-01
• Series: Scientific African
• Subjects: Induction machine; phase frame analysis; Phase impedance matrix; Phase-open-circuit
• Online Access: http://www.sciencedirect.com/science/article/pii/S2468227620302246

In addition to its use as the workhorse in the industry, induction machines are fast gaining popularity in renewable energy applications, hence; the need for continual study on the performances of the machines. In this work, a phase frame analysis of a distribution system that feeds single-phase loads and a three-phase induction motor was implemented with the aim of investigating the effects on the distribution system, of an open-circuit fault that occurs in any of the phases of the stator winding of the motor. The IEEE 4-node test feeder was employed for the study and the phase impedance matrices for all the system components of the feeder determined. A programme based on MATLAB code was employed for the analysis that was done for both the healthy and the unhealthy operating conditions of the machine. Based on a specified voltage tolerance value of 0.00001 V, the simulation converged after five iterations giving relatable and reasonable result. The result showed that an open-circuit fault in any of the three phases of the induction machine resulted in high voltage imbalance that get worsened with increase in single-phase loads connected to the system. It is recommended that the machine be disconnected from the distribution network once such a fault is detected.