Manby H1L15 Breaker Incident - July 5, 2010 - IESO

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5 System Impact IESO_REP_0670Eastern Standard Time (seconds)Figure 6 Richview Switching Station 230 kV Voltage – July 5 th , 2010Of the 1550 MW of load removed from service during the incident, 648 MW were removedby voltage sensitive customer-owned protection operating in response to the faults. Thisresponse, which has seen an increase in magnitude year-over-year, is believed to beattributed to the installation and operation of highly sensitive breakers within residentialhomes. As a result, an increase in sympathetic load loss can be expected to continue with theexpansion of new-home construction.Figure 7 below illustrates how the remaining 902 MW of load removed by configuration wasmanually restored following the breaker explosion. Total load restoration was completed injust over three and a half hours.Eastern Standard Time (seconds)Figure 7 Percentage of Manual Load Restoration – July 5 th , 201014 Public Issue 1.0 – October 20, 2010
Manby H1L15 Breaker Incident - July 5, 20105. System Impact5.4 Impact on GenerationOntario Power Generation and Bruce Power both reported terminal voltage swings at thePickering and Bruce nuclear generating stations, respectively. All units remained stablefollowing each fault experienced at Manby.In order for ACE return to normal, a combination of hydro-electric and coal-fired generatorswere verbally dispatched down at 15:41 EST to compensate for the temporary load loss. By16:00 EST, IESO software was re-configured to account for the load profile change and allgenerators were returned to automated dispatch.As discussed earlier, the availability of the Portlands Energy Centre allowed for an expeditedload restoration once load transfers were initiated from Manby to Leaside supply. More loadwas available for transfer as the Leaside 230 to 115 kV autotransformers were not asthermally restrictive as they would have been if Portlands was unavailable.- End of Section -October 20, 2010 Public 15
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Manby H1L15 Breaker Incident - July 5, 2010 - IESO

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