以电流为判据的厂用电源快切原理及实现  

House supply fast transfer criterion based on impulse current and its realization

作　　者：艾德胜[1] 

机构地区：[1]国电南京自动化股份有限公司,江苏南京210003

出　　处：《电力自动化设备》2006年第6期85-88,共4页Electric Power Automation Equipment

摘　　要：分析了发电厂厂用电源现有快切装置的现状和依据,提出了通过计算备用电源电压和母线残压之间的差拍电压有效值与断电后母线残压初始频差的乘积,以预测冲击电流的大小,并以此为判据的快切新原理。该方法综合了现有方案的长处,可避免单一参数(频率差、相角差或电压差)不满足就闭锁快切的弊端。以135MW和300MW机组为例,给出了切换时的实录数据,结果表明:该方法可最大限度地发挥快切的功能,提高快切成功率及切换质量。The status in quo of the house supply transfer equipment in power plants and its criterion are analyzed. A fast transfer criterion is presented,using the product of the initial frequency difference of the bus residual voltage after outage and the dead beat voltage RMS（Root Mean Square） between the standby power supply voltage and the bus residual voltage to predict the impulse current. It integrates advantages of present schemes and avoids the unreasonable blocking for single unqualified parameter,such as the frequency difference,the phase difference or the voltage difference. Real-time data of 135 MW and 300 MW generator units during transfer show that, the proposed method realizes fast transfer to maximum and improves the success rate and the transfer quality.

关 键 词：厂用电源 快速切换 冲击电流 切换判据 差拍电压 

分 类 号：TM62[电气工程—电力系统及自动化]