20170516Major Event Report.pdf

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Ir,May 16,2017
VA OVERNIGHT DELIVERY
Diane Hanian
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idaho 83720-5983
RE: Rocky Mountain Power Major Event Report
Dear: Ms. Hanian
Rocky Mountain Power is requesting designation of the March 18, 2017 outage and the
consequences thereof to be classified as a major event and excluded from its performance results
due to the day's performance, which exceeded the Company's major event threshold of 1,141,067
customer minutes lost in aZ4-hour period.
Attached you will find details regarding the major event including restoration resources, number
of customers offsupply, total customer minutes lost, as well as SAIDI, and SAIFI figures.
Rocky Mountain Power will exclude outage information for this event from its network
performance reporting and from customer guarantee failure payments.
If you require further information regarding this report, please contact Heide Caswell, Network
Performance Director, at [phone].
Sincerely,
Po ,r4/a4 7. 6un zt't>-
Douglas N. Bennion, P.E.
Vice President
Engineering Services & Capital Investment
Matt Elam,IPUC
Bev Barker,IPUC
/4*
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report lD-L7-L
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
March t8,2OL7
May L6,2OL7
Shelley
Loss of Transmission
Yes
April Brewer
Heide Caswell / Dan Bodily / Ken Shortt
Event Description
On the afternoon of March L8,20L7, Rocky Mountain Power customers in Shelley, ldaho, experienced
an outage when a potential transformer (PT) at the Sugarmill substation failed. The failed PT damaged
the operate bus causing several other circuit breakers in the substation to be de-energized. The event
affected three substations, feeding 10 circuits, serving L6,L67 customers, for durations ranging from 1
hour 45 minutes to 2 hours 19 minutes. The loss of substation affected approximately 600/o of the
customers served within the Shelley operating area. Due to the similarity of this equipment failure to
an event which occurred in December,2OLT, the company has undertaken a replacement program for
these specific PT models; half of them have now been replaced at the two affected substations, Sugarmill
and Rigby, and the remainder are being scheduled for replacement.
Restoration Summary
At2:52 pm, on March L8,20L7, a 161 kilovolt instrument PT in the Sugarmill substation failed due to an
internal fault. The arc from the failure ignited the oil in the PT. The fire was extinguished by Rocky
Mountain Power crews. Crews were able to isolate the failed PT and ran a temporary control wire from
the remaining PTs, restoring functionality to the affected protective relays. The power system was then
systematically re-stored, energizing specific substations and portions of line in a staged manner to
ensure the no equipment would trip on overload from inrush current. By 5:10 pm all customers had
15f lnterruptions (sustained events)
16,191Total Customer lnterrupted (sustained events)
1,827,589Total Customer Minutes Lost
State Event SAID! lmpact 23.25 Minutes
CAIDI 113
Maior Event Start 3l78lL7 12:00 AM
Maior Event End 3h9lL7 12:00 AM
Event Outage Summary
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been restored. The graphic below displays the extent and duration of outages experienced in the ldaho
Falls area.
There were no company or commission customer complaints made regarding the major event.
Restoration lntervals
Ucon Substation
Sandcreek SubstationFal
Sugarmill Substation
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Restoration Resources
State Estimated Major Event Costs
Major Event Declaration
PacifiCorp designates these events and the consequences thereof a major event in accordance with
docket PAC-E-04-07, where the company and commission agreed that determination of major events
will be made by applying IEEE standard 1366-2003 methodology (commonly referred to as the 2.5 beta
method), wherein a statistical outlier of these extreme events is based on the state daily SAIDI
thresholds. The compant/s 2Ot7 ldaho reliability reporting region threshold is 1,301,447 customer
minutes lost (16.56 SAIDI minutes) in a 24-hour period.
Substation Crewmembers 9
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Personnel Resources
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Total $19,824 s2,025 54t,t7o s10,508 $t9,t2t
Estimate S TOTALLaborContracts Materials Overheads
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Event Details
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