Identification of Magnetizing Inrush and Internal Short-Circuit Fault Current in V/x-Type Traction Transformer

Abstract

This paper deals with the fault diagnosis methodology for the V/x-type traction transformer in railway passenger-dedicated lines. A kind of the protection methodology to combine empirical mode decomposition (EMD), energy weight, and information entropy is proposed. This method can sensitively reflect the dynamic information changes of traction transformer differential current, so it can not only effectively identify internal short-circuit fault current from magnetizing inrush but also better identify fault current accompanied with magnetizing inrush. In this method, the differential current is decomposed by EMD and the energy weight of each intrinsic mode function (IMF) is calculated, and the feature vector of the fault pattern recognition is obtained by constructing IMF energy entropy. The field-measured data illustrate that the new method not only has the advantages of high sensitivity, faster identification speed, and clear concept but also is available for the diagnosis of the complicated dynamic system.

Research on integrated control strategy of doubly‐fed induction generator‐based wind farms on traction power supply system

“…There are mainly three-phase power supply systems: direct supply mode, booster transformer (BT) power supply mode, and auto transformer (AT) power supply mode. The wiring modes of traction transformer include: single-phase, V/V, V/X [19], YNd11, Scott, balance transformer, et al [20]. This paper takes a 220-kV TPSS with the V/X connection transformer as an example to analyze the negative sequence and harmonics generated by the electric railway.…”

Advances in Fault Diagnosis for High-Speed Railway: A Review

“…Model-based methods were developed to identify the faulty element as well as the fault type of the transformer [9]. In [10], a signal processing-based fault diagnosis method was proposed to detect the transformer internal short-circuit fault. The aging problem of the insulation paper in a transformer leads to interturn short circuit in the secondary windings of current transformers, and sometimes may lead to unexpected dangers for a TPSS.…”

Using mathematical morphology to discriminate between internal fault and inrush current of transformers

“…Therefore, it was difficult for these methods to be implemented in practical applications. In addition, Li et al [16] and Tian et al [17] proposed a hybrid algorithm which combined the intrinsic mode function energy entropy with the correlation dimension theory for the V/x‐type traction transformer. A novel technique based on the moving windows was developed from the full‐cycle Fourier algorithm and least error square method [18, 19].…”