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Home My WebLink About20170123Major Event Report.pdf~~~~OUNTAIN January 23, 2017 VL4 OVERNIGHT DELIVERY Diane Hanian Commission Secretary Idaho Public Utilities Commission 4 72 West Washington Boise, Idaho 83720-5983 RE CEIVED 2ul 1JA',!23 A· lQ:33 i . ' ) i: I J .l ;_ I C . , .. cc;,;.,i1s s10N RE: Rocky Mountain Power Major Event Report Dear: Ms. Hanian 1407West North Temple Salt Lake City. Utah 84116 Rocky Mountain Power is requesting designation of the December 7, 2016, outage at the Rigby 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 major event threshold of 1,141,067 customer minutes lost 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 (503) 813-6216. Sincerely, Douglas N. Bennion, P.E. Vice President Engineering Services & Capital Investment cc: Matt Elam, IPUC Bev Barker, IPUC Report to the Idaho Public Utility Commission Electric Service Reliability -Major Event Report ID-16-5 Event Date: Date Submitted: Primary Affected Locations: Primary Cause: Exclude from Reporting Status: Report Prepared by: Report Approved by: Event Description December 7 -8, 2016 January 23, 2017 Rexburg Loss of Substation Yes April Brewer Heide Caswell/ Dan Bodily/ Ken Shortt On the evening of December 7th Rocky Mountain Power customers in Rexburg, Idaho, experienced an outage when a potential transformer {PT) at the Rigby Substation failed. The failed PT damaged the operate bus causing several other circuit breakers in the substation to de-energize resulting in the loss of station service power. Ultimately the event affected 17 substations that fed 46 circuits, serving 28,817 customers, for durations ranging from 2 hours 42 minutes to 5 hours 23 minutes. The loss of substation affected approximately 86% of the customers served in the Rexburg operation area. Event Outage Summary # Interruptions (sustained events) 53 Total Customer Interrupted (sustained events) 28,817 Total Customer Minutes Lost 6,899,554 State Event SAIDI Impact 89.64 Minutes CAIDI 239 Major Event Start 12/7 /16 10:07 PM Major Event End 12/8/16 03:31 AM Restoration Summary At 10:07 pm, on December 7, 2016, an internal fault caused the failure of a PT in the Rigby Substation. The arc from the failure ignited the oil in the PT. Crews worked to extinguish the fire, but the residual heat in the PT caused the fire to reignite several times. Crews were able to isolate the operating bus and restore power to the transfer bus. Crews then ran temporary control wire from the remaining PTs so the rest of the breakers would function correctly. The fire department arrived on site, but due to the location of the PT they were unable to assist. Due to the extreme temperatures and the lack of station service power, the air line on one of the breakers froze which required the substation crew to use a different breaker. Once power to the Rigby substation was restored efforts were focused on systematically re-energizing specific substations and portions of line such that the substation equipment could adjust and would not trip on overload from inrush current. At 12:50 am on December sth crews 1 of 4 begin energizing distribution circuits. By 3:31 am all customer outages had been restored . The graphic below displays the extent and duration of outages experienced in Rexburg. There were no company or commission customer complaints made regarding the major event. Customer Outage Duration (in hours) "' Outage Duration Duration hrs View ... Ranges: e value = 0 e O <= value < 3 e 3 <= value < 4 0 4 <= value < 5 0 5 <= value < 6 e 6 <= value < 10000 lO 2' Iona Idaho Falls Ammon 0 0 • 0 () Squirrel • ;i:•. • • .. -. ,I . J .-•,, .... i· • . • I ' • 00 oc o e o Oo <O 0 o<P &>o f)ZI 0 0 <:P 0 go 0 o0 D 0 Oo 0 00 2 of 4 Restoration Intervals Restoration Resources Personnel Resources Internal Crewmembers 6 Substation Crewmembers 7 TOTAL 13 State Estimated Major Event Costs Estimate$ Labor Contracts Materials Overheads TOTAL Capital $25,237 $112 $5,043 $4,724 $35,116 Expense $0 $0 $0 $0 $0 Total $25,237 $112 $5,043 $4,724 $35,116 Major Event Declaration PacifiCorp designates these events and the consequences thereof a major event in accordance with Case No. PAC-E-04-07, where the Commission Ordered 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's daily SAIDI thresholds. The company's 2016 Idaho reliability reporting region threshold is 1,141,067 customer minutes lost (14.82 SAIDI minutes) in a 24-hour period. 3 of 4 Event Details Customers Out vs. Time 30,000 25,000 20.000 8 115.000 a 10.000 5.000 12/1/ll l0:15 PM Z7,778 Total Event Sustained Customer Interruptions; 28,817 Idaho Major Event -CUtttHMIS Chit •'*-CulfO...,.OUt ot------~----==_L---~---~=====---.-------------.-4a 12/7/16 U>.07 PM 12/1/16 U:31 /IM Concurrent Outages vs. Time so l610:l5PM 45 '6 40 E 35 II' 30 8 1! 25 ~ § 20 15 10 12/1/16 5:19 /IM 12/1/16 7aA3 /IM 12/1/16 lD:07 AM Tott! Evmt Ouuccs· s1 12/1/1611:31 PM 12/1/IU:55 PM -(oncurremOutlpt -ltelum to NonMI Tlwetholtl a .,._co..ci.encouue- 0 fletumtoNotmll o-l------~----~-==>---..=====~======~---1..---~---___c:=::;= 12/7/U. 10:07 PM 12/1/16 lZ:31 /IM 12/1/165:19/IM 12/1/U. 7:43 /IM Customer Minutes Interrupted vs. Time (Cumulative) Tat.al CuU90'.Kc Minutes lntcrruotcd· 6,a99,s54 S,000.000 1 7,000.000 l i 6.000,000 a 1 5,000.000 ~ 4.000,000 . ! C 3.000.000 l 2,000.000 ::Ii 1,000.000 12n11u0:01 PM 0 12/7/1' 10:07 PM 12/1/1' 12:31 AM 12/1/1' 2:55 AM 12/1/15 5:19 AM 12/1/16 7:'5 AM SAIDI, SAIFI, CAIDI by Reliability Reporting Region Please see the attached system-generated reports. 12/1/16 10:07 /IM 12/1/16 10:07 AM 12/1/II, 12:31 PM 12/1/16 2:55 PM 24-Hr CMI 6,e,,,SS4 -CUffllltatfvieCMI -MailorEvent,..,.....W e SwtllfMefAIMOUIII• e Swt TkM Olf lnl Out ... 8 l•HICMI 12/1/1' 12;31 PM 12/1/1' 2:55 PM 4 of 4 Idaho 12/7/2016 PacifiCorp Major Events Report Sustained % Sustained Customer Analysis* Customers Customers Off Off PC PACIFICORP 28,817 2% RMP Rocky Mountain Power 28,817 3% ID Idaho 28,817 37% ID MONTPELIER 0% ID PRESTON 0% ID REXBURG 28,165 88% ID SHELLEY 652 2% ID SMITHFIELD I 0% PacifiCorp Major Event Report Customer Analysis Customer Analysis through 12/8/2016 Customers Restored by Intervals Number of Sustained Customer Smin-3 hrs-24 hrs-48 hrs-72 hrs - CML Interruptions Count <Smin 3 hrs 24 hrs 48 hrs 72 hrs 96 hrs 6,899,554 53 1,868,631 160 6,652 22,165 - 6,899,554 53 1,097,421 160 6,652 I 22,165 l 6,899,554 53 76,971 160 6,652 22,165 I - 6,844,373 49 32,156 160 6,000 22,165 55,181 4 26,229 652 i I - *Only current event specific metric impact shown. Does not include values from other events which may have occurred in other regions during the same time period. Customer Interrupted by Date 12/7/2016 through 12/8/2016 Customers Restored by Intervals Date• Sustained % Sustained Number of Average Customers Customers Sustained Customer Smin-3 hrs -24 hrs-48 hrs-72 hrs- Off Off CML Interruptions Count < 5 min 3 hrs 24 hrs 48 hrs 72 hrs 96 hrs 12/7/2016 27,778 36% 6,830,591 46 76,971 5,613 22,165 12/8/2016 1,039 1% 68,963 7 76,971 160 1,039 - Data as of 1/4/2017 120716 ID Final Report numbers.xlsxCustomer Analysis Major Event Only • metric by operating area customer counts % Sustained Customers Restored in 3 96 + hrs Hours PS4 SAIDI SAIFI CAIDI 23% 3.69 0.015 239 23% 6.29 0.026 239 23% 89.64 0.374 239 0% 0% -21% 212.85 0.876 243 100% 2.10 0.025 85 - Major Event Only • metric by state customer counts % Sustained Customers Restored in 3 96 + hrs Hours PS4 SAIDI SAIFI CAIDI 20% 88.74 0.361 246 100% 0.90 0.013 66 1/20/2017 Event 12/07/16 through 12/08/16 PacifiCorp Major Event Report SSC by State Analysis Month 12/01/16 throu1_h 12/31/16 IVTD FY2017 01/01/16 through . 12/31/16 Idaho Major Events Included Major Event Excluded Major Events Included Major Events Excluded* Major Events Included Major Events Excluded• PacifiCorp Major Events Report SSCbr_State ~,PACIFICO RP t- SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI 4.09 I _ 0.020 _ 20q 0.40 f 0.005 r so[ __ 2i;.02 ! SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI SAIFI I 1.oso I 0.152 I -_l?!.J ___ ~JJ L JJ..Q.?7 I 1191 215.51 I ,l:,533 i 141 I-119.14 ... ..,_ 1.124 I ~-!Rocky Mountain Power =r=·G.42! . -o:02's". 232-__ _:3 971-18.15~ D.126_=_:~piiil--0~091r=__wsl22·2.s9T 1.524 i 1461 __ 125.78 '==..;_J,_ 126.6l 0-0.538J -!£._ Idaho 89.73 I 0.375 0.09 178 235 12.94 0.119 109 I 392.07 : 3.040 1 l/;7 I 0.232 0.204 n 635 07R7 I 0.004 I ID MONTPELIER ID PRESTON 0.09 0.0005 ID REXBURG 88.92 _9.36~-- ID SHELLEY 0.72 n nnR --I ID SMITHFIELD I _ --_-*---'--:r= r---.,· _ "" , "" f 0.22 0.002 95 21.30 ·-0.235-: 91 20.96 182 ~ -~..!_BI_ _ -24vf ~-494 0.50 . __Q.QO~,....._. 92 >---~. ~-_ -163_ 16M 2~------+----_ ~-.£).44'!_, _220 . _ 8.64 0.079 110 ?.?!:?.§_).~· 132 76.13 ----·-· -·---85 0.0004 0.00001 !,_. 29 4.29 0.041 _ 104 _ 3.58 0.03~ 109 ~ ~ . lD_ ~ ---:.:..+ . __ . 1 . o oo o ooo 89 o.oo 0.000 89 0.31 0.004 s1 o.37 IM *may include other regional major event exclusions during the same period. Operating areas are calculated by the state frozen customer count metrics. Data as/of 1/4/2017 120716 ID Final Report numbers.xlsxSSC by State 1/20/2017 CAIDI 110 112 --- 112 90 81 120 133 87