20190521Major Event Report.pdf

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1407West NorthTemple
Salt Lake City, Utah 84116
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IOAH$ PUBLIC
11il_rTrE$ C0&iMlss
May 21,2019
VA OWRNIGHT 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 ofthe April 3, 2019 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 Idaho reliability reporting region threshold of
1,238,872 customer minutes lost (15.09 SAIDI minutes) in a 24-hour period.
Attached you will find details regarding the major event including restoration resources, number
of customers off supply, 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,
Douglas N. Bennion, P.E.
Vice President
Engineering Services & Capital Investment
cc: Bev Barker, IPUC
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report !D-19-1
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
April3, 2019
May 21,2019
Shelley
Loss of Supply
Yes
April Brewer
Heide Caswell/ Pete Singh flony Perkins
Event Description and Restoration Summary
On the morning of April 3,2Ot9, Rocky Mountain Power customers in Shelley, ldaho, experienced an
outage when the 69 kV transmission line feeding between Sandcreek and Sugarmill Substations
experienced an unknown trip event. The event should have caused a momentary trip and reclose for
the circuit breaker at the Sugarmill Substation, however the substation ground relay mechanically
remained in the trip position blocking the reclosing on the circuit breaker, causing a sustained outage
event.
The event affected three substations (Ammon, Ucon, and Sandcreek Substations), feeding a total of 11
circuits, serving L7 ,3L9 customers, with outage durations ranging from t hours 4 minutes to 2 hours 27
minutes. The loss of supply event affected approximat ely 64% of the customers served within the Shelley
operating area. Personne! were quickly dispatched to the substation and sent to inspect the line.
Meanwhile area engineers were contacted to review the current system configuration and develop a
plan to begin restoring feed from alternative sources. Upon inspection of the transmission line no cause
was found at to the initiating event for the line trip, however while inspecting the substation crew
located the failure with the ground relay.
1of 4
Affect re-routing the power feed and energization of all the customers who experienced an outage,
the relay was tested and the line was placed back in service, restoring the system back to its normal
configuration. Further testing was performed on the ground relay and crews determined the
equipment is working properly. Unrelated to the outage event system operations has changed the
number of recloses to two, instead of one, for improved sectionalizing performance at the Sandcreek
Substation. There was one commission customer complaint made regarding the major event.
f lnterruptions (sustained evcntsl 2t
Total Customer lnterrupted (sustained events)17,424
t,599,297
19.48 Minutes
CA!D!92
Major Event Start 4l3lt9 72:00 AM
Malor Event End 4l4lL9 t2:00AM
Event Outage Summary
Customer Outage
Bv Restoratlon Time
f ^r.o.atuo.,*
CJrtors Rll'abil:t
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Uccon Substation
Sandcreek Substation
Sugarmill Substation Ammon Substation
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The graphic below displays the extent and restoration stages by duration for the outages experienced
in the Shelley area.
2ol4
Total Customer Minutes Lost
State Event SAIDI lmpact
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Tota! Customer Sustained
Outage Events
(entire major event period)
< 3 Hrs.3 - 24 Hrs. 24+ Hrs.
Restoration !ntervals
Restoration Resources 1
State Estimated Major Event Costs 1
Major Event Decla ration
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 company's 2019 ldaho reliability reporting region threshold is 1,238,872 customer
minutes lost (15.09 SAID! minutes) in a 24-hour period.
1 Data provided represents specific system records for personnel, resources, and costs; and is specific to the event, not inclusive of state
delineation. However additional resources whose participation did not get individually captured in transaction recording systems were
utilized during the event, thus the data presented here effectively understates the resources, including cost, involved in restoring the
system to normal.
Substation crewmember 7
Personnel Resources
Capital
Expense
s3,357
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So
So
So
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Total $3,357 $o $o $3,3s2
LaborEstimate S TOTALContracts Materials
3 of 4
Event Details
SAlDl, SAlFt, CAIDI by Reliability Reporting Region
Please see the attached system-generated reports.
Customer Mlnutes lnterrupted y!i. Time (cumulative)
Tgtal Customcr Mlnut6 lnte.ruotcd: 1,599,297
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Customerc Out vs. Time ldaho Maior Event
Total Event Sustained Customcr Interruotions: l7,a2a
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Concurrent Outates vs. Tlme
Total Event O!tar6: 2l
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