大容量机组高压厂用变压器负等值电抗分析  

Negative Reactance Analysis for High-voltage Unit Auxiliary Transformers of Large-capacity Generators

作　　者：朱忠亭[1] 

机构地区：[1]华东电力设计院,上海200063

出　　处：《电气技术》2006年第8期56-58,62,共4页Electrical Engineering

摘　　要：对于厂用电系统设两个高电压等级的大容量机组,高压厂用变压器通常选用三绕组变压器。通过分析可以得到三绕组变压器的Y型和Δ型等值电路,并可以得到其相互之间的变换关系。在实际应用中,Y型和Δ型等值电路中可能会出现负等值电抗。由于等值电抗只是变压器数学模型中的参数,并不具有物理意义,所以负等值电抗出现也是可能的。分析表明,负等值电抗与正等值电抗具有相反的特性,对厂用电系统的正常运行和短路电流计算都有“负影响”。For generators with two-high-voltage-level unit auxiliary systems,unit auxiliary transformers always be three-winding transformers.A Y or?type equal circuit can be used to model a three-winding transformer.There are given relationships between different circuits.In actual applications,there may be negative reactance in the Y or ? type circuits.Because the reactance is just a parameter in the equal circuits and don't have physical meanings,it is possible that the reactance be a negative value.Analysis shows that a negative reactance has the contrary characteristic to a positive reactance when the auxiliary power system is in a normal or short-circuits state.

关 键 词：大容量 机组 高压厂用变压器 负等值电抗 

分 类 号：TM406[电气工程—电器]