Fault diagnosis method for transformer core looseness based on multi-sensor fusion voiceprint feature map

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 129-137.

LI Nan1, MA Hongzhong1, DUAN Dawei1, ZHU Hao1, HE Ping2

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Abstract

The core looseness fault leaves a huge hidden trouble on the safe and stable operation of the power transformer, a practical and reliable diagnostic method has not yet been presented. In this paper, a multi-sensor-fusion voiceprint based diagnosis method core looseness fault of power transformer is proposed. Firstly, four sensors are used to collect the time-domain series of the voiceprint, which are converted to voiceprints by the wavelet transform. The weight of different voiceprints, which are achieved by different sensors, are calculated by the entropy weight method. By weighted fusion, a multi-sensor-fusion voiceprint is generated. Secondly, the multi-sensor-fusion voiceprint is input into the improved ShuffleNetV2 model, where the fault degree is identified by group convolution and channel shuffling. Finally, the effectiveness of the method is verified experimentally. Experimental results show that the proposed method can reliably diagnose the winding faults with looseness of 25%, 50%, 75% and 100%, and the accuracy rate is up to 99.6%. Compared with conventional voiceprints, such as FFT, GAF, MTF, and RP, the diagnosis accuracy is increased by 12.2%. Compared with single-sensor voiceprint the diagnosis accuracy is increased by 5.8%. Compared with other neural network models, such as AlexNet , MobilleNetV2, GoogleNet and ResNet, the diagnosis accuracy is increased by 2.7%.

Key words

power transformer / core looseness fault / voiceprint / multi-sensor fusion / neural network models

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LI Nan1, MA Hongzhong1, DUAN Dawei1, ZHU Hao1, HE Ping2. Fault diagnosis method for transformer core looseness based on multi-sensor fusion voiceprint feature map[J]. Journal of Vibration and Shock, 2023, 42(15): 129-137

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