超高压长线的分相纵差保护方案设计  

SCHEME OF THE CURRENT DIFFERENTIAL PROTECTION FOR LONG UHV TRANSMISSION LINE

作　　者：李岩[1] 陈德树[1] 尹项根[1] 张哲[1] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《电力系统自动化》2002年第15期49-52,共4页Automation of Electric Power Systems

摘　　要：单一的差动保护判据无法兼顾超高压长线保护对灵敏性、速动性和可靠性的要求。文中利用相关分析结合各种判据特点设计了一个总体性能最优的综合方案 ,即用速动的相关差动判据反映严重故障 ,用高灵敏差动判据经长延时反映轻微故障 ,用灵敏的故障分量差动反映其他故障 ,用相量差动判据反映转移性和发展性故障。ATP的仿真初步证实 :该方案具有反时限的动作特性 ,抗电容电流能力强 ,可反映高阻故障 ,满足了超高压长线快速、灵敏。Single differential criterion can't satisfy the special requirements of long UHV transmission line for the sensitivity, speed and reliability of protection. In this paper, an integrated scheme that can get the optimal general performance is provided based on the correlation analysis and the integration of several different criterions. The speedy new criterion based on correlation analysis is chosen to protect the serious faults, the high sensitive criterion is used to protect the slight faults, and the sensitive criterion using transient fault component currents is designed to protect other simple faults, and the criterion using current phasor is used to protect the converted faults and developed faults. The results of simulation based on ATP show that the above scheme has the inverse time-lag character, and resists the influence of distributed capacitance current, and can reflect high earth-resistance faults, so it can satisfy the requirements of EHV/UHV transmission line for the reliability, sensibility and speed of differential protection.

关 键 词：超高压长线 分相纵差保护 设计 继电保护 输电线路 电容电流补偿 

分 类 号：TM773[电气工程—电力系统及自动化]