摘要 |
<p>The system (10) includes a plurality of protection application elements (20) to accomplish various power system protection, including for example line protection, line fault location, current direction determination, breaker protection and synchronism check, among others. The system includes local sources (14) of current and voltage information for the protective functions as well as a receiving section (16) for receiving such current and voltage values from a remote source (12), such as another protection device, as well as other necessary input information for the protective functions. A selection logic section (18) is responsive to the output of the protective function elements, as well as the local and remote data to determine whether the primary or local sources are to be used. The outputs of the protective function elements are used by an output section (24) to control circuit breakers and the like and are also transmitted, with the local and remote source quantities, to other protective devices.</p> |