20180126Major Event Report.pdf

Y ROCKY MOUNTAIN
mlYE*""
REC E IVED
?0t$ JAil 26 Al,t 9: 33
rr' ,1 r,i\ rl lrl 1/1I .:"1 :r., I..t I0LlU
I i i il I'iii:l; C(iiriMiSSl0N
1,107 West North Tcmple
Salt Lake City. Uah 8,1I 16
January 26,2018
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 November 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 a24-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, /
J rtT.Zav 7L- EaPrt"- /.r,*
Douglas N. Bennion, P.E.
Vice President
Engineering Services & Capital Investment
cc Bev Barker,IPUC
Report to the ldaho Public Utilities Commission
Electric Service Reliability - Major Event Report lD-L7-2
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
November 78,2077
January 26,2018
Montpelier
Loss of Transmission
Yes
April Brewer
Heide Caswell / Dan Bodily /Tim Sehorn / Ken Shortt
Event Description
On November 18th, 20L7, at 5:20 P.M., portions of SW Wyoming, Northern Utah, and South Eastern
ldaho experienced a loss of transmission line event when the static line on the 69 kV line running from
Naughton and Sage Junction Substation failed. The event affected three transmission substations,
feeding L4 distribution substations, serving 18 circuits, suppling power to 9,600 customers. ln ldaho the
event met the major event threshold as almost half the 10,000 Montpelier customers (4,834 customers)
were out of power. Outage durations for these customers ranged from 6 hours 45 minutes to 12 hours
36 minutes. Restoration activates were significantly impacted by the network configuration (due to
upgrades occurring on the network), in addition to rough terrain which was exacerbated by heavy snow,
fog, and rough terrain during night time hours.
# lnterruptions (sustained events)11
Total Customer lnterrupted (sustained events)4,847
Total Customer Minutes Lost 3,581,438
State Event SAIDI lmpact 45.57 Minutes
CAIDI 739
Major Event Start 7tll8,ll7 12:00 AM
Major Event End [/r9lL7 12:00 AM
Event Outage Summary
1of6
Restoration Summary
On the evening of November 18th service in Utah, Wyoming, and ldaho was significantly impacted when
the overhead static line on Naughton to Sage Junction 96 kV line failed causing a loss of transmission
line outage. The static line made contact with the conductor, tripping open the circuit breaker at the
Sage Junction Substation causing a loss of feed from Naughton to Ovid Substation (see figures L and 2
for system impact).
Several factors prolonged the restoration, including the network configuration at the time of the fault
event, which was functioning on a radial feed due to network upgrades occurring at Oneida substation.
With that alternate source unavailable, dispatch attempted several times to restore power by test
operating breakers to restore the system, however these devices were unable to hold. At7:2L P.M. after
opening a line switch near Naughton substation crews were able to close the circuit breaker feeding
Sage Junction, restoring a portion of the line. Troublemen were dispatched from three operating bases
between 5:23 A.M. and 5:54 A.M., in order to most rapidly find the problem and restore service. At 9:54
P.M. patrol completed for Naughton to Sage portion and restoration actions began, first restoring feed
to Sage Junction and six of its distribution fed substations. As the patrol activities continued back toward
Ovid over the next several hours further attempts to restore power were affected however they were
only partially successful. Shortly after midnight on November 19th, Rich and Poverty Substations were
restored. At 4:33 A.M. lndian Creek and Raymond substations were restored. At 5:37 A.M. power was
restored to Ovid Substation and by 5:57 A.M. the last the remaining customers fed from Ovid were
restored.
The terrain and weather, including snow, fog, and nightfall coupled with limited accessibility to the line
given the rough terrain, delayed power restoration.
There were no company or commission customer complaints made regarding the major event.
2ol6
Oneida Alternated systern
feed open du€ to
substation relay
vlork
ldaho
utah
t tah
Wyoming
Statk line
failure
Figure 1. Affected transmission line and system layout. Feed restoration began with the Naughton to Sage
Junction 69 kV line working its way up the system to Ovid.
GRG11Georgetmrn
Montpelier
sTctlSt Charles
Raymond
Garden
City GRC12
lndian
Creek
Poverty
RICtl Rich
Randolph
Cokeville Woodruff
Pope
Chapman
Nugget
Ovid
Sage
Junction
Naughton
3of5
,'' MNT11 -,r
,@
(g)
@)
I
I
I
I
I ,- woo11 -'r
'- I
t,-,-,-,-,-,-,-
NUG23
Georgetown Substation
Montpelier Substation
Raymond Substation
o
lndian Creek Substation
t.,
ta
Poverty Substation
Cokeville Substation
Pope Substation
St Charles Substation
Garden City Substation
69
L
t.
Nugget Substation
Conbou l,labonal Fwesl 5m@t I
fi o
Rich Substation
Randolph Substation
Woodruff Substation
Chapman Substation
O Io.r,o MajorBnntortagnr
Gr*aner0rhge [lmatims. ByBratirn (Hours):
I O.= value < 3
O3'=value<6
6 <= vdue < t2
I t2 '= Ya{uG < 24
I 24 '= nalue < lfix)
Trarmirsirn Lirrc
- 46 169 otlS
Q Tronrnisin Substation
I ustituuur Subetrson
o,
Figure 2. Affected customers and their outage duration time.
4of6
Ovid Substation
Oneida Substation
a
Sage Junction Substation Naughton Substation
I
I
,l
I II
lr
-1
t
4,847 13 4,834 0
Total Customer Sustained
Outage Events <3Hrs 3 - 24 Hrs. 24+ Hrs
(entire ma or event period)
Restoration !ntervals
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 SAID!
thresholds. The company's 2077 tdaho reliability reporting region threshold is 7,307,447 customer
minutes lost (16.56 SAIDI minutes) in a 24-hour period.
Support Staff 1
Lineman Crew 74
TOTAL 15
Personnel Resources
So
S23,600
Capital
Expense
So
52,974
So
s410
So
s26,984
S23,EooTotal 52,974 $410 S2G,984
Estimate S Labor TOTALContracts Materials
5of6
Event Details
Cu3tomeri Out vs. Timc ldaho M.ior Event
Totrl Ewrt fuitahad Cu3loma. 4ntanuDtronr:a g,
5
E
g
t
-q;redaa..lmffitu
amrmtaanD
Customer Manutes lntarruptsd vs. Tlme lcumuhtivc;
Td.l Curtorer Minulcs lnurr@tcd: t 5llr3E
iaroom
Lt0o'0(x,
3,000&
2Joq,qx,
2,m,oq,
1.5@,00
r,000,0@
50.m
o
-c{r*tuil|
-rE|-:fil|I,
lrc.|,
,/r-P(m +$rraaIt
Eq
Efe
t;it
a lfrrtrcrhmtr
a ra*41
rvrrylrU$At lvrulrl!'.lltil lu[/rr]t5All lVlUr,Iu fi{ lvlyl, uro^ri lvrryrr aralrt
rururTrdoPrr
5pq,
5r@
4,000
!.m
r,0(I,
1.q,0
0rvlq/rrD0s rvla/trt t^ra lvla/tr*!6^t rvlVrr2:ast rvr{lrr:f,trx rvrryrruofi rvrt/rr&[^t
Concurrent OutaSes vs. Time Iotal EEnt Outrcs: ll
12
to
t
6
a
-cc.ffia.Ea-
-l-rm
E LaDlllrtaaad
,
5t
I
5
o m66xml
lvlUrrr::OIrt lvlrytr."'at^xl lvlrtr'j'5Ar rvryrrl:art lvrVulrrPfl lvrryrrUoolm rut/I7*allr
lVtg/rr4r3:tlL
SAlDl, SAlFl, CAIDI by Reliability Reporting Region
Please see the attached system-generated reports.
6of6
tvrr/1r&!rril
10
rVIUI?lrllttl
@
oNsN
o'6
.>oc
o
Eo
loxoIEooott.sl!
Eo
u.l
o'(s'
o
F
@
do
ooo
E
q)
E(5ooEoc.C
3ooc.9oo
oco
.EE
E
foooo
oE
(0
Er.9E
=o
o
o
oEo
Eo
oJG
o)!lE.c
oc
ruoo
c;oEa
oGo
.Eo.E
oEoEoo)oa
co
oc
E)o
co
o
U
o
N
r N@oo
o NU]
ggXE
o
4+oo
.1, r<rgt
;9.
!-gN
ic
!rpS
E.Erc @+
'Es
6
.s
Eo
obTEE
EE8
o
ctr
tq E
rfiEJfoz^E
=L,
@
$-
@
di
tEc,g9OEJOx$
:R@
rEg P*EE633
r
@+
+ooo
NoNa
o
U
or o
N N
No
A
N@qo
6Io
oo
ci
oIo qo6onNu1
EH.saEEET;EEEsUoe6E
so x No oo
=+oo
;2
ErXt
.1, e
!rgN
i,. e
!-S$
e-E
S€
6 oq
'El
6
N
c.E
6
or
N
ou'l
@r
r01o @-
N9-EEo,EE(J
roo
o
ts E
€EE:foz-E
J
=I
6
$-
@
di
o
$.
€u'l @
o
x@ x@ orEcooo
fox$
xo
r
@ o.
NEE.E EFf;96;E
N
@d
|cdfoxU
*or'6o>
$&oE8r<Eg b&t E
Eqt
o
4co
s2
=IJ
4
o,oA
.so
Efo
I
0d
oEo!
du
EAFzoE
e _o erAE4II
Eo
CLou
tr.Qoa>alrJ EbI(!X
=so.Eboo
'5(!o-
o,m'ri
LIlmll8ll'lt^ilolno!l'l
iltt
L_.1
I
6
H
u
I
@
1
1
illil-lIilII *^llHl,olI urltllxl
l"l
t1Ul^lI ttlt@t
l"l
o!o3
I
ooN
N
o
6i
NO
r@
oo
@N@tscir
aN
.j
@q
N
N
.i
o@ :@:n
oiN
\N
ru]rqor
o
o
oo
N
N
qa a
.l
o \N
r 6o
@n
:::o:
:m:
:N:
1
Ili-toiN
;.i
@N
oqN
u-1o
NON\a\NdN
HO@$n d')oi
'bo.E
,I
c
U
oB'
NN66egoo
o6
cj.i
N
I
i
I
o
o
@ N
6i
ooqo
oo
osmqqqooo
o
E
r
N
oO
ciooci ci
!oB
=
@
c,
N0q
N o
Oa q
N
@o @
ci
q
@
N
6i
@$N@ci ^i
Eot
U ooooo,oci ci
66do?cj
o@
@ooci
@
o
U
g
IoNq
nlo
o
r
@q
oa
c,
rqo
oqo
ooqo
oI oqo
NNdOoio4
Eo
N;\
ET:oE
N
S
!a
o6'
rooa
E
r
oci ct6
@qo
€oqo oo
o
ct
@r rNd q @u.1
oo
NOO@oocgqooo
oEo
=
coo
Eo
o
=
to
r&oE8TEEgi,o lrl (,(L\r/io6.B
E
q
o
E
6
oo
GU
Fzo
ou-F
2OF.d>
iro=UXU(u-
I E
U o:F:oo o o
N
6'.o
E
clo
oEo
l
co
o
a
oE
!!o
!f!o
oo
ooo
@c
oao
<,
'=oq
o
E
oE
@c'=a!
co
l
o
ca
a
o6
Etc
'too
o
oo
l
;
E
ooo
-ooaaxottooot
o
i!
c
6)
[!
o'(5'
=o
F
o
Eo
CLotrs.Q
eE'rIJ ike.=(E(!-;x
=;CLrr
EYtEo(!
o.
o@ou)Qr:+N@dnt.N d N
$r@6
@
ro@
t
I
O N: N O9donNrHl :dr I
1,:li
H