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Detection and Location Approach to Incipient Grounding Defect in Transformer Winding Based on Sequence Voltage Ratios at PV Inverter Switching Frequency by Geye Lu; Qinghao Zhang; Dayong Zheng; Sohrab Mirsaeidi; Pinjia Zhang is a Engineering article available to read on EtoBox.

What is Detection and Location Approach to Incipient Grounding Defect in Transformer Winding Based on Sequence Voltage Ratios at PV Inverter Switching Frequency about?

Silicon carbide (SiC) power devices are used increasingly in photovoltaic (PV) inverters, with the high switching frequency (f s ) and voltage slew rate. For the SiCbased-inverter-fed transformer, the ageing of groundwall insulation is aggravated and the grounding defect should be reliably detected at incipient stage. In this article, a novel approach based on negative and zero sequence voltage components at f s is proposed to realize comprehensive online monitoring of incipient grounding defect. At f s , the equivalent sequence circuit of the PV distribution network is built and the mechanism and characteristics of sequence voltage components are investigated in scenario of the high-resistance grounding defect. The effects are distinguished caused by defect from imbalanced operation. Two sequence voltage ratios are developed to identify the occurring phase and to evaluate the defect location and severity. The MATLAB/Simulink model and the SiC-based-inverter platform are built for simulation and online experimental validation, respectively. The proposed online approach can sensitively detect and locate the defect with grounded resistance above 1 kΩ from each winding. Due to its non

Who reads Detection and Location Approach to Incipient Grounding Defect in Transformer Winding Based on Sequence Voltage Ratios at PV Inverter Switching Frequency?

Author

Geye Lu; Qinghao Zhang; Dayong Zheng; Sohrab Mirsaeidi; Pinjia Zhang

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Published

2023

Language

EN

Field

Engineering (Physical Sciences)