10 kV出线速断保护短延时对变压器的影响分析
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摘要
为提高配网供电可靠性,分析了10 k V出线速断保护增加短时延对变压器的影响。分析结果表明,在变压器允许耐受短路电流的冲击下,短时延的增加对绕组热稳定、动稳定影响不大,但短路冲击累积效应会使变压器铜绕组、垫块等产生微小的残余形变,应当引起重视。
In order to improve the power supply reliability of distribution network, the influence of the addition of short delay in the instantaneous protection of 10 kV outlet line on the transformer is analyzed. The analysis results show that under the impact of permissible withstand short-circuit current of the transformer, the addition of short delay has little effect on the thermal stability and dynamic stability of the winding, but the cumulative effect of the short-circuit impact will cause tiny residual deformations on the copper winding, pad etc. of the transformer, which should be paid attention to.
In order to improve the power supply reliability of distribution network, the influence of the addition of short delay in the instantaneous protection of 10 kV outlet line on the transformer is analyzed. The analysis results show that under the impact of permissible withstand short-circuit current of the transformer, the addition of short delay has little effect on the thermal stability and dynamic stability of the winding, but the cumulative effect of the short-circuit impact will cause tiny residual deformations on the copper winding, pad etc. of the transformer, which should be paid attention to.
引文
[1]欧阳武.10 kV出线速断保护增加短延时的可行性分析[C].第二十届华东六省一市电机工程(电力)学会输配电技术讨论会论文集,2012.
[2]李林达,李正绪,孙实源,廖一帆.电力变压器短路累积效应研究综述[J].变压器,2017,54(2):24-31.
[3]杨毅,张楚,刘石,等.基于振动的油浸式电力变压器短路累积效应试验研究[J].广东电力,2016,29(12):115-120.
[4]谢毓城.电力变压器设计手册[M].机械工业出版社,2003.
[2]李林达,李正绪,孙实源,廖一帆.电力变压器短路累积效应研究综述[J].变压器,2017,54(2):24-31.
[3]杨毅,张楚,刘石,等.基于振动的油浸式电力变压器短路累积效应试验研究[J].广东电力,2016,29(12):115-120.
[4]谢毓城.电力变压器设计手册[M].机械工业出版社,2003.