|
|
|
| Influences of AC and DC Voltage Component on Typical Insulation Model Breakdown Characteristics in Transformer Oil |
| Li Bo1, Cheng Huanchao1, Sun Qian1, Li Jinzhong1, Li Guangfan1, Deng Junyu1, Fan Wei2, Xu Huiyu1 |
| 1. China Electric Power Research Institute Beijing 100192 China 2. State Grid Corporation of China Beijing 100031 China |
|
|
|
|
Abstract In the HVDC transmission system, the failure of converter transformer is the key problem for the electrical power system safety. Oil-paper insulation system in converter transformer bears AC and DC voltage in their lifetime. Since having no way to simulate its actual working condition, usually, AC and DC test voltage are separately imposed on the transformer during the factory test. Different influences of AC and DC voltage on the insulation characteristics are unknown. This paper designs a needle-plate model, and imposes different AC and DC voltage values to the oil surrounded needle-plate model to study the differences of breakdown characteristics. The test reveales the different effects of AC and DC voltages to the insulation model breakdown characteristics. The results indicate that under the combined AC and DC voltage, the AC breakdown voltage decline linearly as the pre-DC-voltage value increase and vice versa. The result also suggests the pre-stressed voltage type affects the test result obviously and for the oil surrounded needle-plate model, the breakdown voltage value of pre-stressed AC-voltage is higher than the condition of pre-stressed DC-voltage.
|
|
Received: 25 July 2010
Published: 07 March 2014
|
|
|
|
|
|
[1] 苏宏田, 齐旭, 吴云. 我国特高压直流输电市场需求研究[J]. 电网技术, 2005, 29(24): 1-4, 41.
[2] 韩晓东, 翟亚东. 高压直流输电用换流变压器[J]. 高压电器, 2002, 38(3): 5-6.
[3] 金涛, 凌愍. 葛洲坝和南桥换流站一次绕组类设备运行情况[J]. 电力设备, 2003, 4(3): 10-14.
[4] CIGRE JTF B4.04/A2-1. Analysis of HVDC thyristor converter transformer performance-summary of 1972-2002 failures[R]. 2004: Electra No. 212.
[5] 李盛涛, 张拓, 黄奇峰. 变压器油纸绝缘结构的击穿电压与频率和时间的关系[J]. 变压器, 2009, 46(4): 39-43.
[6] Li Junhao, Si Wenrong, Yao Xiu, et al. Influence of temperature on partial discharge properties in disc-void of oil/pressboard insulation[J]. Advanced Technology of Electrical Engineering and Energy, 2009(1): 34-37, 55.
[7] 任寅寅. 直流下油纸绝缘中局部放电脉冲典型波形及其参数提取[J]. 高压电器, 2008, 44(5): 438-441.
[8] 王云杉, 周远翔, 李光范, 等. 油纸绝缘介质的空间电荷积聚与消散特性[J]. 高电压技术, 2008, 34(5): 873-877.
[9] 何少华, 文竹青, 娄涛. 试验设计与数据处理[M]. 长沙：国防科技大学出版社, 2002.
[10] 国家标准化管理委员会. GB/T 507—2002绝缘油击穿电压测定法[S]. 北京: 中国标准出版社, 2003.
[11] 周远翔, 孙清华, 王宁华, 等. 空间电荷对低密度聚乙烯电气击穿特性的影响[J]. 高电压技术, 2008, 34(3): 447-450. |
|
|
|
2011, Vol. 26 
