| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved differential protection system.SOLUTION: A current differential protection system for a multi-terminal power line comprises: 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 the 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 time stamp data from the local terminal. |
