Sympathetic Transformer Inrush Detection and Relay Blocking During Power System Restoration

Jaworski, M.; Jaeger, Johann

doi:10.1109/tpwrd.2023.3243020

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…There are different types of inrush currents for a power transformer including energizing, sympathetic, and recovery inrush currents [4,5]. The saturation of the power transformer core is the main reason for all types of inrush currents [6,7]. The inrush current amplitude can reach several times the nominal value and can endanger the security of power equipment protection.…”

Section: Introductionmentioning

confidence: 99%

An innovative harmonic‐based approach for inrush current detection in low‐loss transformers

Sanati,

Ahmadi,

Sanaye‐Pasand

2024

IET Generation Trans & Dist

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Transformer inrush current occurs due to the saturation of magnetic core. The magnetic characteristic of the core directly affects the inrush current waveform. Second harmonic and higher‐order harmonics are present in the inrush harmonic spectrum. A harmonic‐based method analysing the amplitude and phase of different harmonics is presented here. Based on the proposed method, the differences between the harmonic spectrum of new low‐loss and previous‐generation materials are investigated. Then, using the patterns of 1st to 10th harmonic phases, a novel method for inrush current detection is proposed. In the proposed method, possible patterns for the harmonic phases related to the inrush current are specified. The harmonic phases are compared with those specified patterns. In the case of matching, the inrush current condition is detected. To evaluate the theoretical principles, simulations are performed, also, the proposed method is applied to the field data to assess the practical performance, and results are presented.

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