Dyn11型变压器高压侧一相断线引起的电压变化分析  

Voltage variation analysis caused by one phase broken line at high voltage side of Dyn11 transformer

作　　者：李国亮 LI Guoliang(Chinese Railway Electrification Bureau Group North Engineering Company Limited,Taiyuan 030000,China)

机构地区：[1]中国铁建电气化局集团北方工程有限公司,太原030000

出　　处：《黑龙江电力》2018年第3期246-248,共3页Heilongjiang Electric Power

摘　　要：Dyn11型变压器因其对3N(N为整数)次谐波电流的有效抑制,以及承受单相不平衡负荷能力突出,而被广泛应用于10/0.4 k V变电站。在实际中,由于低压负荷分配不均且波动较大,使得高压侧某一相或两相电流过流,导致其熔断器熔丝断裂,或由于外界原因,使得高压侧相线断裂。其中两相断线时低压侧电压会全部消失,而一相断线时,低压侧电压会出现畸形变化。通过分析Dyn11型变压器高压侧一相断线时变压器内部电磁过程的变化及其对低压侧电压的影响,得出电压变化规律,可以为以后故障判断提供参考依据。Dyn11 transformer is widely applied to 10/0. 4 KV substation because of its effective suppression of 3 N（N integer） sub harmonic current and the ability to withstand single-phase unbalanced load. In the actual production and life,because of the uneven distribution of the low voltage load and the large fluctuation,a phase or two phase current will flow over the high voltage side,which will lead to the fuse break of the fuse. Or due to some external reasons,the high voltage side phase line is broken. When the two-phase is broken,the voltage at the low voltage side will all disappear. When the phase is broken,the voltage at the low voltage side will be deformed. The change of the electromagnetic process of the transformer is analyzed when the line is broken on the high side of the Dyn11 transformer,which can make the general rule obtain. It can provide a reference for future fault diagnosis.

关 键 词：Dyn11型变压器 电压变化 高压侧一相断线 

分 类 号：TM933.3[电气工程—电力电子与电力传动]