In response to challenges such as the subtle early fault indications and the fluctuating harmonic content in power systems affecting diagnostic accuracy,this paper presents a novel method for analyzing and diagnosing inter-turn short circuit faults in dry-type air-core reactors,taking into consideration the influence of harmonic volt-ages.Addressing three distinct operating conditions such as normal reactor operation,early-stage arc-type inter-turn short circuits,and mid-to-late-stage metal fusion-type inter-turn short circuits,the paper analyzes the operational characteristics of both series and parallel reactors under fault conditions to identify specific early fault indicators for inter-turn short circuits in each configuration.Additionally,the paper establishes a simulation model for inter-turn short circuit faults in reactors that accounts for harmonic voltage effects and analyzes the variation in electrical char-acteristics of series and parallel reactors under various operating conditions.Subsequently,it proposes a diagnostic method based on the current harmonic ratio for series reactor faults and another method based on the active power ra-tio for parallel reactor faults.To validate the effectiveness of the proposed method,the paper constructs an experi-mental test platform for inter-turn faults in series and parallel reactors and conducts experiments to confirm its cor-rectness and efficacy.
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