| 发明名称 |
Current differential protection |
| 摘要 |
A current differential protection system for a multi-terminal power line includes a current sensor for sensing a current at a local terminal, a controller for time synchronizing the local terminal and remote terminals, and a fault detection module to detect a fault in the multi-terminal power line if a differential current exceeds a threshold value. The controller includes a time measurement exchange module for exchanging time stamp data with remote terminals, an upper range clock for exchanging time stamp data with remote terminals and a lower range clock for indexing the current at the local terminal. A first time period of the upper range clock is N times a second time period of the lower range clock where N is a number of multi-terminals. The controller includes a clock offset calculation module for determining an average time offset based on time stamp data from remote terminals and the local terminal. |
| 申请公布号 |
US8963558(B2) |
申请公布日期 |
2015.02.24 |
| 申请号 |
US201213665479 |
申请日期 |
2012.10.31 |
| 申请人 |
General Electric Company |
发明人 |
Pan Yan;Premerlani William James |
| 分类号 |
G01R31/08;H02H3/30;H02H7/26;H02H1/00 |
主分类号 |
G01R31/08 |
| 代理机构 |
|
代理人 |
Joshi Nitin N. |
| 主权项 |
1. A current differential protection system for a multi-terminal power line comprising:
a current sensor for sensing a current at a local terminal; a controller for time synchronizing the local terminal and remote terminals, the controller comprising:
a time measurement exchange module for exchanging time stamp data with remote terminals;an upper range clock for providing local time measurements to the time measurement exchange module;a lower range clock for indexing the current at the local terminal, wherein a first time period of the upper range clock is N times a second time period of the lower range clock where N is a number of terminals in the multi-terminal system;a clock offset calculation module for determining an average time offset based on time stamp data from remote terminals and the local terminal;a phase-frequency locked loop for determining phase and frequency signals for the upper range clock and the lower range clock based on the average time offset; and a fault detection module to detect a fault in the multi-terminal power line if a differential current exceeds a threshold value. |
| 地址 |
Niskayuna NY US |
