Towards a transformer transient model as a lumped-distributed parameter system. Issue 3 (2nd May 2017)

• Record Type: Journal Article
• Authors: Zirka, Sergey E.; Moroz, Yuriy I.; Rahimpour, Ebrahim
• Is Part Of: Compel. Volume 36:Issue 3(2017)
• Page Start: 741
• Page End: 750
• Publication Date: 2017-05-02
• Subjects: Magnetic hysteresis -- Magnetic shunts -- Three-limb transformer -- Transformer tank -- Transient model; Electrical engineering -- Data Processing -- Periodicals; Electrical engineering -- Mathematics -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Data Processing -- Periodicals; Electronics -- Mathematics -- Periodicals; 621.3
• DOI: 10.1108/COMPEL-09-2016-0389
• Languages: English
• ISSNs: 0332-1649

Abstract

Abstract : Purpose: The purpose of this study is to develop a topological model of a three-phase, three-limb transformer for low-frequency transients. The processes in the core limbs and yokes are reproduced individually by means of a dynamic hysteresis model (DHM). A method of accounting for the transformer tank with vertical magnetic shunts at the tank walls is proposed and tested on a 120 MVA power transformer. Design/methodology/approach: The model proposed has been implemented independently in a dedicated Fortran program and in the graphical pre-processor ATPDraw to the ATP version of the electromagnetic transient program. Findings: It was found that the loss prediction in a wide range of terminal voltages can only be achieved using a DHM with variable excess field component. The zero sequence properties of the transformer can be accurately reproduced by a duality-derived model with Cauer circuits representing tank wall sections (belts). Research limitations/implications: In its present form, the model proposed is suitable for low-frequency studies. Its usage in the case when transformer capacitances are involved should be studied additionally. Practical/implications: The presented model can be used either as an independent tool or serve as a reference for subsequent simplifications. Social/implications: The model proposed is aimed at meeting the needs of electrical engineering and ecology-minded customers. Originality/value: Till date, there were no experimental data on zero-sequence behavior of three-phase, three-limb transformer with vertical magnetic shunts, so no verified transient model existed. The model proposed is probably the first that matched this behavior and reproduced measured no-load losses for a wide voltage range.