20190827Major Event Report.pdf

Y ROCKY MOUNTAIN
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- 1407 West North Temple
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, ; i :i?i U$*ci,ti,! !8r, r*August 27,2019
VIA 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 July 10,2019 outage atthe Montpelier
substation 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,
bnrVr"rX fuarun*h
Douglas N. Bennion, P.E.
Vice President
Engineering Services & Capital Investment
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report !D-19-2
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
July 10, 2019
August 27,20L9
Montpelier
Loss of Supply
Yes
April Brewer
Heide Caswell/ Pete Singh / Kevin Freestone
Event Description and Restoration Summary
On the afternoon of July 70th,2019, Rocky Mountain Power customers in Montpelier, ldaho,
experienced a loss of substation outage event when bushings failed on the substation power
transformer at the Montpelier Substation. The event affected all three ef circuits fed from the
Montpelier Substation, serving 2,215 customers.
Field Personnel were quickly dispatched to the substation. Dispatch, area engineers, and management
worked together to determine the optimal response to mitigate impacts to customers was to
concurrently install a mobile transformer while simultaneously replacing the damaged bushings. ln
addition, crews were able to begin some step restorations by switching power feeds from alternate
sources. The first restoration occurred at 6:32 p.m. (1 hour 35 minutes from the start of the outage),
energizing power to 72 customers using historic loading information. Shortly thereafter, personnel
began receiving realtime loading information from operations, and as load levels decreased throughout
the evening, it became possible to complete additional switching to restore further customers. From
8:19 p.m. to 11:40 p.m. in five additional switching steps crews were able to restore power to 1,076
more customers including all of the Montpelier 14 circuit. From 1:56 p.m. to 2:26 p.m. on July LLth,
replacement of the damaged bushings was completed and crews were able to restore feed to the
remaining 1,067 customers fed from the Montpelier Substation.
During the event crews from across the region were called in to assist. An area engineer was utilized to
determine loading and recommend switching for step restorations, while dispatch was used to
communicate switching orders to the field. Local (Montpelier) wire crews worked to perform the field
step restorations as well as to build shoeflies and help install the mobile transformer. Preston apparatus
and relay technicians were needed to apply and test the transformer relay settings, install the mobile
transformer and replace the bushings. ln addition crews from Salt Lake City transported and delivered
the mobile transformer. The regional business representative coordinated with customers and city
representatives to ensure customers without power had the support and resources needed.
To date, there have been no company or commission customer complaints made regarding the major
event.
tof4
# lnterruptaons (sustained events)1L
Total Customer !nterrupted (sustained events)2,485
Total Customer Minutes Lost 1,589,049
State Event SAIDI lmpact 20.58 Minutes
CAIDI 580
Maior Event Start 7/L0/19 L2:00 AM
7/7U19 12:00 AMMajor Event End
Event Outage Summary
The graphic below displays the extent and restoration stages by duration for the outages experienced
from the Montpelier Substation.
Montpelier
Substation
Customer Outage
Bv Restoration Time
f on"o.o tor,.r,on
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5t2 342 2,1432,485
Total Customer Sustained
Outage Events
(entire major event period)
< 3 Hrs.3 - 24 Hrs. 24+ Hrs.
Restoration Intervals
Restoration Resources 1
State Estimated Major Event Costs 1
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 company's 2019 ldaho reliability reporting region threshold is 7,238,872 customer
minutes lost (L5.09 SAIDI 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.
Support Staff 1,
Substation crewmembers 9
Engineer 1
3Bushings (69kV,400A)
Personnel Resources
Equipment
S24,330
So
542
So
s8,332
So
53,7t6
So
S36,420
$o
Capita!
Expense
s42 S8,332 S3,zts S36,420s24,330
Estimate $TOTALLaborContracts Materials Overhead
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Total
Event Details
Customers Out vs. Time ldaho Major Event@1.t5
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SAID!, SAlFl, CAID! by Reliability Reporting Region
Please see the attached system-generated reports.
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