摘要
燃气轮发电机励磁变压器高压侧套管电流互感器,其准确限值系数由机端短路电流和所选电流互感器的一次侧额定电流两者决定。励磁变高压侧短路电流非常大,而其额定电流又比较小,因此按常规方式难以选到满足要求的励磁变高压侧电流互感器。燃气轮发电机差动保护采用不完全纵差保护,因此可以利用此方法来降低励磁变高压侧电流互感器的准确限值系数。此外,利用电流互感器准确限值系数与二次侧负荷的关系,可以进一步提高电流互感器的准确限值系数,满足工程的需要。
Accuracy limit factor of HV bushing current transformers of gas turbine generator excitation transformer is decided by both short circuit current and primary side rated current of the selected current transformer. Short-circuit current of excitation transformer HV side is very large, and the rated current is small, so it is very difficult to meet the requirements by conventional way. Gas turbine generator adopt incomplete differential protection, The incompete differential protection is adopted in gas turbine generator, so this method can be used to reduce accuracy limit factor of HV bushing current transformers. In addition, using the relationship between accuracy limit factor and the secondary side load can improve the accuracy limit factor to the requirement.
出处
《东方电气评论》
2015年第2期72-75,共4页
Dongfang Electric Review
