20151021Major Event Report 2.pdf

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UT iLlTl r S C0;,,i,,'{ lii$ i CNOctober 21,2015
VA OVERNIGHT DELIWRY
Jean D. Jewell
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idaho 83720-5983
RE: Rocky Mountain Power Major Event Report
Dear Ms. Jewell:
Rocky Mountain Power is requesting designation of the August I, 2015 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
1,114,149 customer minutes lost in a24-hotx 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].
Vice President
Engineering Services & Capital Investment
Rick Sterling,IPUC
Bev Barker,IPUC
1407West NorthTemple
Salt Lake City, Uah 84 I 16
Sincerely,
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report lD-15-2
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
August L,2Ot5
October 2L,2OL5
Shelley and Montpelier
Loss of supply
Yes
April Brewer
Heide Caswell / Dan Bodily / Ken Short
Event Description
On August L, 2OLS,ldaho experienced two loss of supply events. The first event
occurred at 9:54 am in Shelley, when a faulty low oil sensor triggered a transformer at
the Sugarmill Substation causing a lockout. The transformer is a source to the
Sandcreek, Ammon, and Ucon Substations, and when locked out caused outages to a
totalof 10 circuits and impactingL6,222 customers for just over 2 hours. The second
event occurred at 8:51 pm in Montpelier, when the bus on the Grace 151 kV line locked
out, de-energizing the 46 kv transmission lines leaving the substation. These lines feed
six surrounding distribution substations. The event impacted 10 distribution lines and
4,168 customers for less than 2 hours.
Restoration Summary
ln the early morning of August 7,20L5, personnel were quickly dispatched to the
Sugarmill substation. An inspection on the facility showed that a low oil level sensor had
tripped the 161/69 kV transformer. The transformer oil level was checked and found
full, thus the sensor was bypassed and the transformer was re-energized. The
transformer was subsequently re-inspected on August 3.
Later on the evening of August 1 a transmission line fault caused a breaker at the Grace
substation to trip, de-energizing the 46 kV transmission line exiting the substation.
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Upon arrival personnel determined that the breaker had operated in accordance with
the line fault, specifically it had experienced a fault event to which it was required to
respond. The circuit breaker was isolated and all outages were restored in L hour 50
minutes. A full inspection and overhaul on the breaker was performed and no
abnormalities were found. New relays are planned to be installed to provide more
precise fault information should future fault events occur.
Atotalof two crew members participated in restoration work, and required no
materials.
There were no company or commission customer complaints made regarding the major
event.
Restoration !ntervals
20,395 20,394 1 0
Restoration Resources
Crew members 2
Materials none
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
company's 2015 ldaho reliability reporting region threshold is 1,299,474 customer
minutes lost (15.95 SAIDI minutes) in a 24-hour period.
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