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| 摘要: |
| 根据变电站现有设备条件,提出了3套母差保护技术改造方案:方案1保证技术改造期间母差保护一直投入运行,最容易实施;方案2改变电网运行方式与潮流分布,需要进行大量的一次设备倒闸操作;方案3需要对二次回路进行频繁操作,实施难度最大。阐明了选择方案的原则:在各间隔电流互感器均有备用二次绕组的前提下优先采用方案1,其次根据变电站在电网中所处的地位选择方案2或方案3。至今,该3套方案已经在生产实践中得到了应用。 |
| 关键词: 母差保护,电流互感器,备用二次绕组,二次回路 |
| DOI： |
| 分类号:TM773 |
| 基金项目: |
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| Discussion on substation bus differential protection retrofitting |
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LIN Wei-hua LIU Hao-ming TIAN Wei
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| Abstract: |
| Based on existing equipment conditions of substations,three retrofitting schemes of bus differential protection are provided.Scheme one is easy to be carried out,which keeps the normal operation of bus differential protection during the period.Scheme two changes the electric grid operating mode and the electric power flow distribution,needing a lot of primary equipment on-off operations.Scheme three is difficult in implementation,which frequently operates on cable loops.The principle of scheme selection is clarified:scheme one is applied firstly if there are standby secondary windings for all current transformers of every cell,otherwise choose scheme two or three according to the position of substation in grid.All three schemes are applied in practice. |
| Key words: bus differential protection,current transformer,standby secondary winding,secondary loop, |
