NDLI: FRA modelling for diagnosing axial displacement of windings in traction transformers

Content Provider	IET Digital Library
Author	Zhou, Lijun Jiang, Junfei Li, Wei Wu, Zhenyu Gao, Shibin Guo, Lei Liu, Hongwen
Abstract	The windings of a traction transformer are always be threatened by the fluctuation of the load. Frequency response analysis (FRA) is regarded as the most effective method to diagnose the winding deformation. Appropriate FRA modelling method may help to predict typical winding faults for large transformers. The existing model usually simplify dozens of winding disks into several disks, it is applicable when analysing small displacement. However, when the disks between windings are seriously misplaced, the conventional model may not be suitable. This study presents an improved lumped parameter circuit model considering intersection capacitances and mutual inductance between windings. The feasibility of the proposed model is verified based on a 10 kV test transformer. Finally, the model is applied for a 220 kV traction transformer, the variation of parameters and features are analysed for axial displacement of different windings. The results show that the axial displacement may lead to increase of resonance frequency and decrease of amplitude. The low-frequency band (1–30 kHz) may be regarded as visible features for diagnosing axial displacement of H winding and the middle frequency band (50–200 kHz) may be a characteristic band for diagnosing axial displacement of T winding.
Starting Page	2121
Ending Page	2127
Page Count	7
ISSN	17518660
Volume Number	13
e-ISSN	17518679
Issue Number	Issue 12, Dec (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/13/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.0362
Journal	IET Electric Power Applications
Publisher Date	2019-09-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Axial Displacement Conventional Model FRA Modelling Method Frequency 1.0 KHz to 30.0 KHz Frequency 50.0 KHz to 200.0 KHz Frequency Response H Winding Improved Lumped Parameter Circuit Model Lumped Parameter Network Power Converter Power Supplies to Apparatus Power Transformer Testing T Winding Test Transformer Traction Power Supplies Traction Power Supply System Traction Transformer Transformer And Reactors Transformer Windings Voltage 10.0 KV Voltage 220.0 KV Winding Deformation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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