重载变电站备自投装置改进研究

Improvement study of automatic bus transfer device in overloaded substation

针对重载变电站的备用自投装置动作后可能给运行主变带来过载甚至损坏的问题,开展了重载变电站备自投装置传统动作过程分析,提出备自投过负荷判别算法以及智能联切负荷算法,并在此理论方法的基础上完成了重载变电站备自投方案改进,实现了备自投装置依据负荷大小自动闭锁或联切负荷的功能,大大降低了备自投装置动作后造成供电电源过载的风险,保证了重要用户的供电可靠性。研究结果表明,该方法能有效闭锁重载变电站备自投装置或切除部分不重要负荷,保证重载状态时主变的运行安全。

Aiming at the problems of overload or damage to the main transformers after the automatic bus transfer device＇s actions of the overloaded substation, the traditional treatment measure was investigated. After the analysis, the overload discrimination algorithm and load intertripping algorithm were established. An optimized scheme of automatic bus transfer device was presented. The function of the automatic bus transfer device to act according to the power load was designed in this scheme. The risk of overload can be reduced if the automatic bus transfer device operates and the supply reliability of important user can be ensured. The experimental results indicate that the methods can lock the bus transfer device or trip the unimportant load of overload substation, and it can ensure the working safety of main transformer.