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Tong X.,Ningbo University | Yuan Y.,CAS Shanghai Institute of Technical Physics | Wu L.,Ningbo University | Liang S.,Ningbo Electricity Power Bureau | And 4 more authors.
Advanced Materials Research | Year: 2011

In recent years, more attention is given to solar blind ultraviolet (SBUV) detection in corona discharge detection and defect diagnosis of partial discharge has been widely used. However, there are still such key techniques should be further studied such as electro-optic characteristics and the quantitative relationship between corona current and UV emission intensity in the process of corona discharge. With different AC voltage and different humidity, corona current and UV pulses are measured. It is shown that corona current and pulse number rise with the voltage mounting up, and decline very weakly with humidity increasingly. In addition, further discusses about the quantitative relationship between electro-optic parameters is implemented by using transfer function. The experiment results, under the conditions of different AC voltage and different humidity, indicate that transfer function maintained between 2.00 to 4.25 changes little, varied no more than 52.9%. UV pulse number, therefore, can be used to characterize corona current intensity. The conclusions above are significant for characterizing the level of corona discharge directly by UV emission intensity, and they are helpful for improving the accuracy of defect diagnosis.


Wu L.,Ningbo University of Technology | Yuan Y.,CAS Shanghai Institute of Technical Physics | Yan H.,Ningbo Electricity Power Bureau | Liang S.,Ningbo Electricity Power Bureau | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The ratio of optical pulse numbers to corona current (ROPC) is proposed to study the correlation between UV radiation intensity and current strength during AC corona discharge. It's found that the ROPC curves rose rapidly before a critical voltage and then the curves flatten with the supplied voltage rising, even if the voltage is increased approximately 1 fold higher than the critical voltage. Finally, according to ROPC curves, a new method of determining the voltage for corona inception is introduced, and a novel quantitative analysis method is put forward to judge the level of corona discharge by the means of optical measurement. © 2012 SPIE.


Wu L.,Ningbo University of Technology | Wu L.,Ningbo University | Yuan Y.,CAS Shanghai Institute of Technical Physics | Yan H.,Ningbo Electricity Power Bureau | And 6 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2012

There are still such two critical problems as the relationship between solar blind ultraviolet (SBUV) emission intensity and transmission distance, and the quantitative relationship between SBUV emission intensity and corona current strength, should be further studied in ultraviolet inspection technology of discharge events. It was shown that in sunny day, within more than 20 meters, SBUV emission intensity detected by CoroCAM was only inversely proportional to the square of distances. Besides, through the electrical-to-optical transfer function (EOTF) from corona current strength to SBUV pulse number, it was found that at the same humidity, even if the supplied voltage increased nearly 1 time higher than that of corona inception, the SBUV pulse number was still in an approximately linear relation with the corona current strength. Therefore, SBUV pulse number can characterize the level of corona discharge.

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