Study on Condensation of the Moisture in Current Transformers with Current Flow Considering Sharp Temperature Decrease

Abstract:

Article Preview

On-site experience suggests the possibility of condensation of the moisture in Current transformers (CTs) with initial moisture content lower than the Chinese National Standard. In order to verify such possibility, the relationship between moisture content and ambient temperature in a typical 110 kV CT is studied. The positive correlation of ambient temperature and moisture content without current flow is clarified, and the relationship of moisture content and current RMS value is studied. Increase in current results in increase of moisture content, and the longer the duration of operation, the larger the moisture content. The possibility of frost condensation of the moisture with sharp ambient temperature decrease has been confirmed with initial moisture content lower than the Chinese National Standard.

Info:

Periodical:

Edited by:

Prasad Yarlagadda and Yun-Hae Kim

Pages:

322-327

Citation:

Z. H. Yan et al., "Study on Condensation of the Moisture in Current Transformers with Current Flow Considering Sharp Temperature Decrease", Applied Mechanics and Materials, Vols. 241-244, pp. 322-327, 2013

Online since:

December 2012

Export:

Price:

$41.00

[1] T. Nitta, Y. Shibuya, Y. Fujiwara, Y. Arahata, H. Takahashi, H. Kuwahara, IEEE Transactions on Power Apparatus and Systems Vol. PAS-97 (1978), p.959.

DOI: https://doi.org/10.1109/tpas.1978.354569

[2] IEEE Standards Board, in: IEEE Guide for Moisture Measurement and Control in SF6 Gas-Insulated Equipment. (1993).

[3] Li Taijun, Wang Zhangqi, Zhang Ting, Liu Quanzhi, Proceedings of the CSEE Vol. 23 (2003), p.169 (in Chinese).

[4] Chao Lv, Xiaoguang Hu, Proceedings of the CSEE Vol. 26 (2006), p.151 (in Chinese).

[5] Chun Lin, Ningxia Electric Power Vol. 6 (2010), p.55 (in Chinese).

[6] National Development and Reform Commission, in: Method of Humidity Measurement of SF6 Insulated Gas in Electrical Equipment. The National Standards in Power Industrial (2008) (in Chinese).