20150113Major Event Report.pdf

ROCKY MOUNTAIN
POA'ER
A OMSION OF RAOBCORP
January 13,2015
VIA OVERNIGHT DELIWRY
l407West NordrTemple
t;i[tIi!,,i:ri SaltLakeCity,Uah 84116
?CI15 J&!{ t3 ltrH 9: tr I
rr\'r'._!t .l t I t.ll li-lTi I :i a:ai,i ili I S S I Cl{
Jean D. Jewell
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idaho 83720-5983
RE: Roclry Mountain Power Major Event Report
Dear: Ms. Jewell
Rocky Mountain Power is requesting designation of the November 29, 2014 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
l,ll4,l49 customer minutes lost in a24-hotr 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,
btb%Y'do^^*l ,*"
Jeffrey K. Larsen
Vice President, Regulation
Enclosures
cc: Rick Sterling,IPUC
Bev Barker, IPUC
to: Idaho Public Utilities Commission
Electric Service Retiability - Major Event Report ID-14-l
Event Date(s):
Date Submitted:
Primary Affected Location(s) :
Exclude from Performance Reports:
Report Prepared by:
Report Approved by:
November 29,2014
January 13,2015
All Operating Areas
Yes
Heide Caswell
Jim Burton, Dan Bodily,
Paul Radakovich
Event Description:
A late fall storm hit Idaho, and during the event, caused insulators to fail, damaging a structure.
During the fault event that resulted from the damaged structure, the protective system, when
expected to operate by opening circuit breaker 49 atthe Grace plant, failed to operate due to a failed
trip coil. The fault cascaded upstream whereupon Grace circuit breaker L40 cleared the fault, which
left nine substations that are fed by this transmission source de-energized. Concurrently, the
weather event which initiated the failed insulators continued to affect the Idaho service territory,
and required additional restoration efforts across the state.
Rocky Mountain Power requests the designation of this event and the consequences thereof be
classified as a major event and excluded from its reliability performance results as it exceeded the
Company's 2014 major event threshold of 1,232,651 customer minutes lost in aZ4-hotx periodl.
Idaho SAIDI Minutes Excluded 58.41 Sustained Customers Off 12,469
Customer Minutes Lost 4,507,457 Sustained Intemrptions 6t
Restoration:
While the storm's damage appeared to be substantial, the nature of the equipment failure extended
its duration substantially. Stage restorations were implemented to restore power to customers where
possible, as rapidly as could be completed. Initially it was concluded that two spans of conductor
would need to be replaced, whose materials were sourced out of Preston, and completed by three
assembled crews. After that replacement was completed (ust after dark) and upon test-energizing,
the circuit intemrpted again, which required patrolling of the entire segment from Lava to the
insulator damage location; it was determined that more substantial conductor damage had occurred
during the fault event and additional conductor would need to be replaced. Additional crews and
materials were brought in, crews from northem Utah and materials from Preston2. During the same
I In docket PAC-E-04-07, the company and commission agreed that determination of major events will be made by
applying IEEE Standard 1366-2003, wherein a statistical outlier for these exfieme events is based on state daily SAIDI
thresholds; the 2014 calculated Idaho SAIDI is I 5.97 minutes, which equates to a threshold of | ,232,65 I customer
minutes intemrpted n a24 hour period.
'As of submittal date approximately 6 miles of conductor have been replaced.-l-
time, Idaho continued to experience wind and snow and additional outage events, many of which
were nested, were the outcome. A nested outage occurs when facilities are damaged at the further
reaches of circuits, but also may experience damage toward the substation. With the company's call
inference system, as well as depending upon which outage is recorded first, pinpointing fuses or
breakers which may have operated can be more complicated, and additional efforts must be
expended to pinpoint the multiple layers of damage within the circuits. This effort extended the
overall restoration time for the major event. The outage impacts are depicted in the graphics below.
Estimated Major Event Cost:
This event resulted in an estimated $120,000 in capital and $60,000 operations and maintenance
cost.
SAIDI, SAIFI, CAIDI Report: Attached
2 of3
Curbm.r tlnub. ltrbmpfO Y!. IIot!
5,@(p0.
Tot lOlstomrr MinuEs lntsruptcd:fthno IqlorEvtnt
+s00,o0
1,O0,m
3,50q,O0
oooof
OFJa;O99S
FN
E.G6
CurbmGlt OnYt.fh.
dsfll
4,m
3,500
3,@0
2,lX'
2,m0
1,5ql
1,(D0
5@
o
Etr>s(L9x
b:E:d\
OF6)
0
rv29Al r&:q,
3 of3
lo
oN
N
{N
;
t-c
F
,o?€:\
s
(:
xoo
o
E
t
(D(t,
@
cc i(o o
G
E
J(!(
S
-::c
r 5 v
a,x,!(
s(
o)q
ro
rtc
,)D
sN s
,)
D
E YI
Y!J!L-)
=
lcIFlu,Ll,rloo
,l
I
IxIa
tlll
oJuJlr-F
TA
l c
l-
o
.2o
o
o
oafI
o
g)N
soN
otr
6
iI
co
IJJ
o'(E-'
=ro
oN
l,t
o
oooH
!,
t!l
0!l
0I
!t
o
o
J
u
l!
o
Es$iuH3*:*
oorIIE
P,O
Sgflv
Eo
$gflv
60
!t 0ON+
oE
cafi
i{u
!tnIrt
a'
c6
E.E
ro
g
N
loE
UE
!o
ooBtr=E6=
9E6\(J
(I @
F-t-
oN
oN
cq!0c
!
oNo
tt Eb.s E-oG=
E.;E
r
J.o
d@(')
txI
tro
F|(!t
sEEE.gg=
$sX $c
EE
EEE99"OQ
t-
^i I
Et
{
ot!o
YoNo
oN oN
N
o
o
lt
o
o
o
Hs$Hu
2 E X?-*
(to)p
IE
2o
Ng
i{v
2o
$gflv
oto
!tON!t
o2
o$il+
u c,
C6.=LEE.o
.l,E
u'E
ooEDtr=EE=o:oiE"
tt Eb,EE.CtG=
5.;E
-o
EE.gE=
EE
EE593"otJ
c
c
O!
tr!g<
c
a
o:.,.Yr is iE
^fl<
gE EH'U6q,=o
Eo
CLot
tr.Qoo>aluJ 3bI'ep
=So.Eboo
'6
IEo.
o
oNN
G
E
oo
!ooU'
ooN
+oNEoo(,t
E.gL
co
ul
o'6-'
=ooN
L
o
ooo
o E(g
N {tsc
c
{C
rnccA
n
4n
c
(
{n t q
o
g
ts N (
Fc
g
q(
i
TI
@\c
(
E
g
Fc
x
{(
s ,c
g E{
gr I
II
,c
c
i C
6 c
c
o?
@
n
c
(
E
Eg
x
z
?t,IJII
:
EII
tt
oN
oN
c
(
r
o
o?o
o
o
IL
o
o
u
o
(,
lr
a4
Eia
oi(,
r
o
o
U'
oio
lt
U'
o
ut
o
o
r
u
o
o
c
c6o:
ci
=<C6
o
o
UEG'GEEE<
s ".:ue-
Es.Esb
IU
Lo
CLod
tr9*IJJ E:L(Bos'=<i;
atn
oo
'6
Go-