Investigation of Harmonics Present in Three-Phase Auxiliary Converter Used in the Locomotives of Indian Railways

The presence of harmonics in locomotives used in Indian Railways has started to become one of the major concerns during the last few years. The cause of harmonics distortions in these locomotives is due to the increase in the use of power electronics devices, wherein the introduction of GTO and IGBT-based locomotives have brought up technological advancement in railways, while on the other hand it have its own certain limitations as well. Hence, the study was carried out on oil cooling blowers and traction motor blowers used in a locomotive which uses GTO and IGBT-based converters. This paper presents the analysis of current harmonics which were recorded using a current clamp and DSO. © 2020, The Institution of Engineers (India).