Aging State Discrimination of Oil-Paper Insulation Using Raman Spectroscopy and Integrated Enhanced KNN

Xingang Chen; Yijie Fan; Zhipeng Ma; Shiyao Tan; Ningyi Li; Xin Song; Yuyang Huang; Jinjing Zhang; Wenxuan Zhang

doi:10.3788/LOP231050

Laser & Optoelectronics Progress, Volume. 60, Issue 21, 2130002(2023)

Aging State Discrimination of Oil-Paper Insulation Using Raman Spectroscopy and Integrated Enhanced KNN

Xingang Chen^1,2, Yijie Fan¹, Zhipeng Ma^1、*, Shiyao Tan¹, Ningyi Li¹, Xin Song¹, Yuyang Huang¹, Jinjing Zhang¹, and Wenxuan Zhang¹

Author Affiliations

¹School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China

²Chongqing Engineering Research Center of Energy Interconnection, Chongqing 400054, China

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Figures & Tables(10)

Fig. 1. Thermal aging experimental process

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Fig. 2. Changes in the degree of polymerization of insulating paper

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Fig. 3. Raman spectroscopy detection platform. (a) Schematic diagram; (b) physical image

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Fig. 4. Raman spectroscopy pretreatment

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Fig. 5. AA-KNN program block diagram

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Fig. 6. Raman spectra of samples with different aging days

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Fig. 7. Discrimination results of aging state of oil-paper insulation samples. (a) AA-KNN; (b) KNN

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Fig. 8. Variation of accuracy of multiple experiments

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Table 1. Classification of aging status categories

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Table 1. Classification of aging status categories

Aging state category	Degree of polymerization range	Sample size
Phase 1	>1000	30
Phase 2	900‒1000	16
Phase 3	800‒900	19
Phase 4	700‒800	17
Phase 5	600‒700	17
Phase 6	500‒600	18
Phase 7	350‒500	15
Phase 8	250‒350	13
Phase 9	150‒250	12
Phase 10	0‒150	12

Table 2. Comparison chart of discriminant model effect
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Table 2. Comparison chart of discriminant model effect
Discriminant model Average discriminant accuracy Kappa index Accuracy standard deviation /10^-2
AA-KNN 0.9832 0.9780 2.11
KNN 0.9136 0.8896 3.20
RF 0.8934 0.8788 3.01
XGBoost 0.9013 0.8911 4.21

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Xingang Chen, Yijie Fan, Zhipeng Ma, Shiyao Tan, Ningyi Li, Xin Song, Yuyang Huang, Jinjing Zhang, Wenxuan Zhang. Aging State Discrimination of Oil-Paper Insulation Using Raman Spectroscopy and Integrated Enhanced KNN[J]. Laser & Optoelectronics Progress, 2023, 60(21): 2130002

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