SPS Misoperation Sample Clauses

SPS Misoperation. The Athens SPS is designed to operate only for post-contingency conditions, namely the loss of Line 91 with subsequent flow on line 92 exceeding its LTE rating or alternately loss of Line 92 with subsequent flow on line 91 exceeding its LTE rating. Operation of the SPS will trip Athens generation to bring the post-contingency flows below the line’s LTE rating. There are several potential misoperation scenarios, not all of which may actually be able to occur depending on the design details of the actual equipment and logic involved:  Failure to operate when it should  Operation without the initiating event, i.e., a false trip  Partial operation, i.e., not tripping enough generation  Overtripping, i.e., tripping too much generation Failure of the SPS to operate when it should is covered in the following subsection. Operation without the initiating event, that is, a false trip of two Athens combined cycle trains (720 MW at full load) is not an insignificant event, but does not result in system conditions outside post-contingency limits. The effect of this misoperation was evaluated by both load flow calculation and stability simulation. Figure 7-1 shows the local system conditions following the loss of 720 MW at Athens. Loadings on all lines are below LTE rating and all bulk system voltages with-in post-contingency limits. Figures 7-2 to 7-5 show results of a stability simulation of the trip of 720 MW of Athens generation. A stable response is exhibited with positive damping. Partial operation, that is tripping for example one combined cycle train instead of two, would result in an intermediate condition between normal operation and failure to operate. The system condition would be stable, but manual operator action to adjust generation at Athens may be required to reduce the flow on the 91 or 92 line to below LTE rating. The fourth possibility is overtripping. The effect of this misoperation was evaluated by both load flow calculation and stability simulation. Figure 7-6 shows the local system conditions following the trip of line 91 and misoperation of the SPS with trip of all generation (1080 MW) at Athens. Loadings on all lines are below LTE rating and all bulk system voltages within post-contingency limits. Figures 7-7 to 7-8 show results of a stability simulation of the trip of Siemens Power Transmission & Distribution, Inc. Power Technologies International 7-1 SPS Misoperation and Failed Operation Analysis 1080 MW of Athens generation following the...
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