Keywords
distribution network; Dy transformer; grounding fault; line voltage feed-in; step-down arc suppression
Abstract
To improve the applicability and reliability of an active step-down arc suppression method for grounding faults in a distribution network and solve the inherent contradiction between fault transfer technology and active arc suppression technology of power electronic devices in arc suppression effect and cost control, an active step-down arc suppression method for grounding faults in the distribution network based on Dy transformer line voltage feed-in is proposed.By application of the constant secondary side line voltage of the Dy transformer before and after the grounding fault and through switching of the corresponding line voltage feed-in switch on the secondary side of the transformer, the reverse voltage of the fault phase is fed into the neutral point, and the fault voltage is actively reduced to realize the step-down and arc quenching of grounding faults.At the same time, the offset characteristics of the neutral feed voltage caused by the internal impedance of the grounding transformer in the distribution network are further analyzed.The phase compensation between the transformer feed-in voltage and the fault phase voltage is realized by optimizing the transformer tap ratio.Therefore, the influence of the phase offset of the feed-in voltage caused by the internal impedance of the grounding transformer is eliminated.To verify the effectiveness of the proposed method, a typical model for grounding faults in the distribution network is built in power system computer aided design （PSCAD） simulation environment for experimental analysis.The simulation results show that the active step-down arc suppression method for grounding faults in the distribution network based on Dy transformer line voltage feed-in can effectively reduce the fault voltage and eliminate the residual current of grounding faults, thereby realizing reliable arc suppression of grounding faults.
DOI
10.19781/j.issn.1673-9140.2025.05.003
First Page
24
Last Page
35
Recommended Citation
HUANG, Jisheng; LIU, Hongwen; HE, Zhihai; LUO, Zhengya; QU, Xijiang; YU, Kun; and ZHOU, Zijian
(2025)
"Active step-down arc suppression method for grounding faults in distribution network based on Dy transformer line voltage feed-in,"
Journal of Electric Power Science and Technology: Vol. 40:
Iss.
5, Article 3.
DOI: 10.19781/j.issn.1673-9140.2025.05.003
Available at:
https://jepst.researchcommons.org/journal/vol40/iss5/3
