| 摘要 |
<p>The present invention is concerned with an alternative redundancy concept for bay protection in Substation Automation (SA) that prevents a single failing Intelligent Electronic Device (IED) of the SA system from impairing the operation of a bay of a substation. A protection IED (21) formally assigned to a home or host bay (20) of a substation of an electric power system performs the protection functions (P20) of the bay to which it is assigned, plus protection functions (P10) of at least one of its neighboring bays (10). In this way, each bay can be managed by two different protection IEDs, wherein redundancy is achieved at software level rather than at hardware level, i.e. there is no need to provide a dedicated redundant protection IED for each bay. Whenever required to do so, the protection IED (21) receives, from appropriate sensors (12), information about a status or value of a process quantity from the neighbouring bay, computes or executes protection functionality such as overcurrent, overvoltage or earth fault on behalf of the neighbouring bay, and issues commands directed to actuators of said neighbouring bay.</p> |
