Research on Ferromagnetic Resonance of Electromagnetic Voltage Transformers in Shale Gas Field Distribution Network

Zhixuan He

doi:10.6911/WSRJ.202603_12(3).0003

Authors

Zhixuan He

DOI:

https://doi.org/10.6911/WSRJ.202603_12(3).0003

Keywords:

Shale Gas Field, Distribution Network, Ferromagnetic Resonance, Electromagnetic Voltage Transformer, In recent years, a series of policies have been introduced

Abstract

The shale gas field has vigorously implemented the "electricity replacing oil" extraction method. Promoting the wide application of distribution network automation technology in shale gas distribution networks. Regarding the frequent occurrence of ferromagnetic resonance faults caused by the saturation of electromagnetic voltage transformers. The current research fails to take into account the load characteristics and actual working conditions. This paper, based on the electromagnetic transient simulation software PSCAD, establishes a PT ferromagnetic resonance model for the 10kV non-grounded system of the Changning Shale Gas Field. The simulation analyzed the effects of line length, conductor cross-section and excitation conditions on ferromagnetic resonance, and proposed suppression measures for the PT high-voltage side through a linear resistor connection. The simulation results show that when the length of the line meets the resonance condition, an increase in length will lead to an increase in the amplitude and frequency of the resonant overvoltage. When considering the cross-sectional area of the electrical conductor, the overcurrent on the PT high-voltage side of the fracturing-specific line is greater than that of the conventional line, which is prone to causing the fuse to blow. The influence of excitation conditions on resonant overvoltage varies greatly. The resonant amplitude triggered by arc grounding faults is the highest. Finally, a protective measure is proposed where the neutral point of the primary winding of the PT is connected to a non-linear resistor, in order to prevent the frequent occurrence of resonance accidents.

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