| Original document(12 pages) 中文版 |
Starting up and protecting method by sampling values in three phases at same time includes steps: sampling circuit samples difference value of currents between phases; relation between positive and negative sequence currents is obtained from the difference values, and then effective value of negative sequence current is calculated and stored in memory; when calculating effective value of negative sequence current, the method magnifies negative sequence current by using data character of spanning windows; using positive sequence current to carry out brake, prevents error start-up caused by unbalanced negative sequence current; based on whether static stable state is destroyed, the method determines to use high or low threshold values, and uses floating threshold to prevent error start-up caused by system oscillation and frequency shift. Comparing with prior art, the invention raises sensitivity and reliability, suitable to relay protection for digital high-tension transmission line. |
Application Number
申请号 |
200410102433 |
Application Date
申请日 |
2004.12.24 |
| Title 名称 |
Method for starting up and protecting sampling values in three phases at same time
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Publication Number
公开号 |
1797887 |
Publication Date
公开日 |
2006.07.05 |
| Approval Pub. Date |
|
Granted Pub. Date |
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| International Classification 分类号 |
H02H3/26,H02H7/26 |
Applicant(s) Name
申请人 |
Xuji Co., Ltd. |
| Address 地址 |
461000 |
| Inventor(s) Name 发明人 |
Liu Huanzhang, Li Ruisheng, Xu Qingqiang, Feng Qiufang |
| Attorney & Agent 代理人 |
chen gao |
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