Performance Assessment of a Wavelet-Based Differential Protection scheme in the Inter-Turn Fault Detection in a Transformer
2020 Workshop on Communication Networks and Power Systems (WCNPS)(2020)
摘要
Faults inside of the power transformer protection zone are commonly detected by the traditional phase and negative sequence differential elements. However, the detection of turn-to-turn and turn-to-earth faults is still a challenge for the traditional phase differential element, especially when the transformer operates with maximum load. Furthermore, the conventional algorithm usually is only able to detect turn-to-turn and turn-to-earth faults at a severe stage, when it involves a larger percentage of winding turns or phase-to-earth fault condition. This paper presents a comparison between the performances of existing conventional and wavelet-based differential protections regarding the detection of turn-to-turn and turn-to-earth faults in a power transformer under different loading scenarios. The wavelet units were more sensitive, faster, and less affected by the load variations, being a promising alternative for detecting transformer failures and preventing the fault evolution to more severe stages.
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关键词
Power transformer protection,turn-to-turn faults,turn-to-earth faults,wavelet transform
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