| 摘要 |
<p>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 synchronizing the time of the local terminal and remote terminals; and a fault detection module for detecting 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 the 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 longer than a second time period of the lower range clock, wherein N is the number of multi-terminals. The controller includes a clock offset calculation module for determining an average time offset based on the time stamp data from remote terminals and the local terminal.</p> |
