厂用电6kV快切装置动作分析与改进

Action Analysis and Improvement of 6 kV Quick Acting Device in Station Service Power System

发电厂中,厂用电的安全可靠直接关系到发电机组、电厂乃至整个电力系统的安全运行。分析了高压厂用备用电源自动切换中存在的问题。通过南通华能电厂中快切装置的定值整定计算和快切试验分析,可知备用电源快速切换装置可有效避免备用电源电压与母线残压在相角、频率相差过大时合闸而对电动机、变压器等电器设备造成冲击,并通过慢切提高厂用电切换的成功率。

Security of station service power system is vital to safe operation of unit and power plant, even of the whole power system. According to calculating of setting values and analysis of quick acting test, quickmake device of back-up source could avoid impulse to motors or transformers effectively when phase-angle difference and frequency difference between back-up source voltage and residual voltage of bus-bar were too big. And based on slow acting successful rate of acting in station service power system was increased.