摘要
高压输电线路缺陷故障早期往往伴随着电晕放电,会产生特定波长的紫外光,因此可以利用紫外成像仪检测这些电晕放电现象。为研究试验电压对输电线路缺陷电晕放电的紫外光子计数率的影响,通过模拟架空线路在不同电压下的电晕放电现象对不同长度的断裂铝股进行了紫外测量,对试验结果进行分析得到了影响规律。试验结果表明,在距离放电点距离相同,且成像增益相同时,断裂铝股起晕后的光子计数率与试验电压的平方近似呈线性关系,试验电压平方对不同长度断裂铝股的影响梯度基本相同,在0.25～0.3之间。这一结论在实际输电线路中也得到了有效验证,为紫外仪在输电线路电晕缺陷检测上的应用奠定了基础。
Defects of high-voltage transmission lines are often accompanied with corona discharge that emits ultraviolet （UV）, so they can be detected by using UV imagers. The applied-voltage on transmission lines influences the UV pho- ton-number of a defect＇s corona discharges. To investigate this influence, we took UV photos on different defects on an overhead transmission line in a simulated system, and analyzed the experimental results. It is concluded that, with a fixed measuring distance and a fixed gain of UV imaging, the photon number is approximately linear to the square of the ap- plied-voltage, with a factor between 0.25-0.3. The result is further verified in practical transmission projects, and it could be a considerable foundation for widely applying UV imagers in defect detection.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第1期147-152,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724503)
国家自然科学基金(51377096)
中国博士后科学基金(2013M530045)~~
关键词
紫外特性
光子计数率
输电线路
缺陷
试验电压
电晕放电
UV characteristics
photon-number
transmission line
defect
applied-voltage
corona discharge
