微机发变组保护中反时限保护整定计算

结合实际工作，改进了原发变组反时限保护的整定计算原则，将原来以发电机额定电流为基准的发变组反时限保护动作特性，变成以任意值为基准的发变组反时限保护动作特性，但并没有改变发变组反时限保护动作特性曲线。该整定计算原则已应用于桥头电厂六期微机发变组保护中，实际应用表明，经改进后新的整定计算原则有助于电网整定计算，具有较高的推广应用价值。

Setting of Microprocessor-Based Inverse Time Protection for Generator and Transformer

According to actual work,the old setting calculation principle of inverse time protection for generator and transformer is improved,which takes freewill value,instead of the rated current of generator,as the basis of operating characteristic for inverse time protection of generator and transformer.The operating characteristic curve of inverse time protection for generator and transformer does not change.It is applied in the microprocessor based protection for generator and transformer at Qiaotou thermal power plant.The practice shows that,the improved setting calculation principle is helpful to the actual work of network setting calculation and worth promoting its application.