摘要
10 kV配电线路耐雷水平较低,雷击跳闸事故频繁。应用EMTP软件对安装线路避雷器的10 kV配电线路的耐雷水平进行了分析。计算了采取不同避雷器安装数量时线路的反击、绕击耐雷水平。分析杆塔接地电阻对耐雷水平的影响。最后对避雷器动作一次释放的能量和电荷量进行计算。仿真结果表明:安装线路避雷器后可有效提高10 kV配电线路耐雷水平,但提高程度与杆塔的接地电阻密切相关。根据避雷器释放的能量和电荷量,可以得到避雷器失效概率,从而预测避雷器的平均寿命。
Because of low insulation level, the trip faults of 10 kV distribution lines occur frequently. In this paper, the lightning withstand levels of the 10 kV distribution line with line surge arresters are analyzed by the software EMTP. The lightning withstand levels of the distribution line with different number of arresters are calculated under lightning shielding and back-flashover strokes, respectively. The influence of grounding resistance of the tower on the lightning withstand level is also discussed. And the released energy and charge in one action of the line surge arrester are calculated. Simulation shows that the line surge arresters can significantly raise the lightning withstand level of 10 kV distribution lines, and the increase in the lightning withstand level depends on the grounding resistance of the tower. The failure probability of the arrester can be obtained according to the energy and charge released by the line surge arrester, thereby the average life of the lightning surge arrester can be predicted.
出处
《高压电器》
CAS
CSCD
北大核心
2017年第9期181-185,共5页
High Voltage Apparatus
基金
国家自然科学基金项目(41175003)
江苏高校优势学科建设工程资助项目(PADA)~~
关键词
10KV线路
耐雷水平
线路避雷器
平均寿命
EMTP
10 kV transmission line
lightning withstand level
line surge arrester
average life
EMTP
