Entity

Time filter

Source Type


Jiang X.,Chongqing University | Yuan Y.,Chongqing University | Bi M.,Chongqing University | Du Y.,EHV Transmission and Substation Company of Hubei Province | Ma J.,Hubei Electric Power Company
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2013

According to the operation experience and investigation in China, the insulation performance of transmission line can be reduced due to the effect of strong rain, which is not considered in the external insulation design. Meanwhile, there is no correction reference regarding the breakdown voltage of air gap under rain conditions in IEC standards. Therefore, a series of experimental tests were conducted in the artificial climate chamber and at Xuefeng Mountain Natural Site with the usage of rod-plane air gap to analyze the relationship between ac breakdown voltage and rain precipitation rate, rain conductivity and ambient temperature. It is shown that the breakdown voltage of air gap decreases with an increase of rain precipitation rate and rain conductivity, and increases with an increase of ambient temperature. In addition, according to the test results, the correction formula of ac breakdown voltage of rodplane air gap under rain condition is proposed and verified in this paper. © 1994-2012 IEEE. Source


Jiang X.,Chongqing University | Yuan Y.,Chongqing University | Bi M.,Chongqing University | Du Y.,EHV Transmission and Substation Company of Hubei Province | Ma J.,Hubei Electric Power Company
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2013

To study the discharge performance of air gap under rain conditions and provide reference to the selection of clearance distance of external insulation in strong rain, this paper explored the influence of different environment conditions, rain intensity, rain conductivity, and ambient temperature on the dc positive breakdown voltage of rodplane air gap in the artificial climate chamber and at Xuefeng Mountain Natural Site. It is shown that the discharge voltage of rod-plane short air gap in wet condition is slightly higher than that in the dry condition; light rain has little influence on the positive dc discharge voltage of rod-plane short air gap. The relative discharge voltage of air gap decreases with an increase of rain intensity and rain conductivity with 2.2% to 0.2% / (mm/min), 1.4% to 0.1% / (100 ¿S/cm), respetively; and it is associated with the increase of ambient temperature with 0.3% to 0.1% / °C. In addition, several computations were carried out with different droplet sizes in rod-plane air gap. It can be indicated that the maximum electric field in the air gap increases with the increase of the radius and number of droplets. © 1994-2012 IEEE. Source


Jiang X.,Chongqing University | Yuan Y.,Chongqing University | Du Y.,EHV Transmission and Substation Company of Hubei Province | Ma J.,EHV Transmission and Substation Company of Hubei Province | Bi M.,Chongqing University
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2012

According to the operation experience and investigation in China, the insulation performance of transmission line will be decreased due to the strong rain effect, which has not been concerned in the external insulation design. Meanwhile, there is no correction method concerning the discharge voltage of air gap under rain conditions in the IEC standards. Therefore, a series of experimental tests in the artificial climate chamber and Xuefeng Mountain Natural Site were conducted with the use of rod-plane air gap to analyze the relationship between the AC discharge voltage and the rain intensity. According to the test results, the correction formula of AC discharge voltage of rod-plane air gap under rain condition is proposed and verified by experimental results. It is shown that: with the increase of rain intensity, the discharge voltage of air gap will decrease and the maximum decreased percentage is 10.32%; the corrected method is applied not only to the distance of 0.2~0.6 meters but also to the distance of 0.7 meter. Source

Discover hidden collaborations