发电厂电气部分变压器保护设计_建筑施工论文 关键词：变压器；保护分类；零序过电流 [gap=689]Keywords: transformer; Protect classification; Zero sequence currents
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Most methods now are based on the steady zero sequence currents, which are effected by arcing, operating manner, etc.
现有的选线方法多是基于稳态零序电流的故障选线方法,受弧光接地、运行方式等因素的影响较大。
参考来源 - 基于小波原理的小电流接地系统故障选线新方法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
For that the transient zero sequence currents are used only, the criterion is immune to the abnormity of the PT, and it can be applied to all kinds of the neutral indirectly grounded systems.
由于只用到暂态零序电流量，该选线判据不受PT异常情况的影响，可以适用于任意方式的不直接接地系统。
Also interference with telephone circuit is reduced because of the absence of zero-sequence currents.
由于无零序电流，对电话线路干扰的影响也降低。
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