换流阀冷却系统均压电极垢层沉积声学检测方法

doi:10.19595/j.cnki.1000-6753.tces.231208

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Abstract Sediment on grading electrodes is one of the main causes of failures in converter valve cooling systems. Traditional maintenance methods mainly involve periodic disassembly and inspection, which are quite blind and can lead to issues such as system leaks from repeated disassembly, severely delaying the maintenance progress of the converter valve system. Most existing research relies on water quality monitoring or other indirect detection methods, which cannot directly reflect the sediment situation. Acoustic detection, however, offers advantages such as high sensitivity, fast detection speed, and strong versatility. Therefore, this paper proposes an acoustic detection method for sediment on grading electrodes in converter valve cooling systems.
Firstly, based on the principles of acoustic detection for grading electrode sediment, an acoustic detection device was designed. This device achieves synchronized control of the sound wave excitation and reception ends, utilizes cumulative averaging for noise reduction in digital signal processing, and transmits the echo signals to a PC for feature extraction and analysis. Secondly, an acoustic detection platform for grading electrode sediment was built. This platform verifies that the designed device can effectively drive the transducer and receive echo signals from the grading electrode and its sediment. It also tests the device's interference resistance in noisy environments, confirming its ability to reliably filter out low-frequency noise, high-frequency spurious signals, and random spikes, thus obtaining clean echo signals. The platform was used to perform acoustic detection on seven groups of grading electrodes with different sediment thicknesses, analyzing the differences in echo signals under sedimented and non-sedimented conditions.
Further, using waveform factors (S_f), peak factors (I_p), kurtosis factors (K₄), pulse factors (C_f), peak factors (C_e), and skewness factors (K₃) as characteristic indicators for echo signals, it was found that S_f, I_p, K₄, C_f and C_e had a coefficient of variation of less than 10% in the non-sedimented condition, indicating good stability. In the presence of sediment, these factors decreased with increasing sediment thickness, while K₃ was generally negative without sediment and positive with sediment. Finally, by calculating the variation rates of echo feature values in relation to the non-sedimented conditions, it was found that ΔS_f, ΔK₄, ΔC_f and ΔC_e had a strong correlation with the sediment thickness, with the Boltzmann fitting function's determination coefficients (R²) exceeding 0.96, indicating that these measures can reliably characterize changes in electrode sediment thickness. Based on the sensitivity relationship between feature quantities and sediment thickness, a prediction strategy for sediment thickness was proposed, effectively predicting sediment thickness at different stages of sediment.
From the experimental analysis, the following conclusions can be drawn: (1) The designed acoustic detection device for grading electrodes can detect sediment and has advantages of strong portability and interference resistance, showing good application potential in practical valve cooling system inspections. (2) Among the used characteristic indicators, K₃ can be used for qualitative analysis of sediment presence, while S_f, I_p, K₄, C_f and C_e are suitable for quantitative analysis of sediment thickness. (3) ΔS_f, ΔK₄, ΔC_fand ΔC_e show a strong correlation with the sediment thickness, and the Boltzmann fitting function effectively characterizes the thickness change process, providing guidance for the maintenance of grading electrodes.

Key words： Converter valve cooling system grading electrode sediment thickness acoustic detection characteristic indicators

Received: 05 July 2023

PACS:

TM721.1

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	Gao Bing
	Huang Chi
	Huang Chenhao
	Wang Shuai
	Yang Mingzhi

Cite this article:

Gao Bing,Huang Chi,Huang Chenhao等. Study on Acoustic Detection Method for Sediment on Grading Electrodes in Converter Valve Cooling System[J]. Transactions of China Electrotechnical Society, 2024, 39(23): 7319-7330.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231208 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I23/7319

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