站用变间隔保护用电流互感器参数选择探讨

Discussion on Parameter Choice of Current Transformer Used by Interval Protection of Station Transformer

探讨110 k V及以上电压等级电力工程设计中站用变保护用电流互感器参数的选择方法。根据工程实践及相关文献研究结论,提出了3种站用变保护用电流互感器参数的选择方法,即按保护最大整定值确定电流互感器准确限值系数、采用不同二次绕组实现站用变的速断和过流保护功能、采用特殊装置实现站用电保护功能。通过对比这3种方法的优缺点,得出第1种方法为最适合工程实际应用的方法。

The parameters choice method of station transformer protection used current transformer in 110 kV and above voltage level electric power project design is discussed. Based on project practices and relevant literature research conclusions, three kinds of parameters choice methods of station transformer protection used current transformer are proposed, including determining the accurate limit coefficient of current transformer according to the maximum setting value of protection, using different secondary circuits to realize the quick-break and over-current protection functions of station transformer, and using special devices to realize protection functions of station transformer. By comparing advantages and disadvantages of three methods, it is concluded that the first method is the most suitable method to the practical project application.