| 摘要 |
<p>A method for detecting and localising a fault on a busbar to a specific section of the busbar in order to provide a proper protection, is herein disclosed. If a fault has occurred, for instance, on a point P of the section between current transformers BCT- and the connection point thereof to the busbar, or on a point Q of the busbar section between neighbouring line outlets, the resulting fault current is expressed as an operational sum of the output current of each current transformer BCT-. The said fault current is zero in normal conditions, but, in the case of a fault, reaches a definite value other than zero. Noticing this point, the fault current is computed for each section on the basis of the observable output current of each current transformer BCT- , and it is judged that, if the foregoing current of a specific section exceeds a predetermined threshold, the fault has occurred on the above section. <IMAGE></p> |
