自耦变压器在大庆电网中的应用

Application of autotransformer in Daqing power grid

以大庆电网为例,探讨自耦变压器在高压电网和超高压变电所的使用情况,从自耦变压器一、二次间过电压和零序电流无法隔离的特点,分析在绝缘上和零序电流保护整定配合上的问题。论证自耦变压器的电压调整性能、三Y型自耦变压器的零序电流外补偿、自耦变压器继电保护整定的特殊问题。

This paper discusses the situation of application of autotransformer in high voltage power grid and EHV substation taking Da qing power grid as an example.Based on non-isola tion features of over-voltage and zero sequence current between primary and secondary of autotransformer,the problem for coordinating of insulation and protection relay setting of zero se quence current is an alyzed.The voltage regulation characteristic of autotransformer,external compensation of zero sequence current for three Y au to transformer and some special problems for protection relay setting are also discussed in the paper.