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Sigurd RAS – LAPS
Presented by Seongtae Kim, Bharaivee Sant & Joseph Leineweber
WECC RASRS Meeting
November 4-6, 2019
Transmission Planning
2
Transmission System in Sigurd Area
3
IPPMona
West
CedarRed
Butte
345 kV
138 kV
230 kV
500 kV DC
Foreign owned
Clover
Parowan
Tushar
Cameron
HickoryEscalante IEscalante II
Escalante III
Stevensville
Iron Sprin
gs
Granite Mtn.
Sulphurdale
Red Hills
PavantBlack
Rocks
Cha
utau
qua
Baseline
Arapa
hoe
Milford
Enterprise
Enterprise Solar
Coleman
Three Peaks
Currant Creek
Glen Canyon
Sigurd
UTAH
ARIZONA
Most Recent Queued Transmission Service Request (TSR) at
Sigurd substation
4
IPPMona
West
CedarRed
Butte
345 kV
138 kV
230 kV
500 kV DC
Foreign owned
Clover
Parowan
Tushar
Cameron
HickoryEscalante IEscalante II
Escalante III
Stevensville
Iron Sprin
gs
Granite Mtn.
Sulphurdale
Red Hills
PavantBlack
Rocks
Cha
utau
qua
Bas
elin
eAra
paho
e
Milford
Enterprise
Enterprise Solar
Coleman
Three Peaks
Currant Creek
Glen Canyon
UTAH
ARIZONA
Sigurd TSR Q2471
(Q589 Sigurd
Solar)
Normal (N-0) during Light Load in Southern Utah and High
Stressed Northbound on TOT 2B1
5
After N-1 outage of either Sigurd 345/230 kV Transformers #5
or #6
6
RAS Logic
7
*Each Sigurd 345/230 kV transformer #5 and #6 has 448/502 MVA (Normal/4-hour ratings). 497 MW is used
to have 5 MW margin.
≥ 497 MW* total combined flow on both Sigurd 345/230 kV transformers #5 &
#6
Trip the 230 kV tie-line circuit breaker at Sigurd substation and the 230 kV circuit breaker at Sigurd Solar substation to trip the Sigurd solar generation
N-1 outage of either Sigurd 345/230 kV transformer #5
or #6
• This RAS results in
―Up to 80 MW generation tripping
―No load losses
• Misoperation or failure of this RAS will result in thermal overloads on
either the Sigurd 345/230 kV transformer #5 or #6.
― Operating procedure is proposed due to misoperation or failure.
― Operating procedure is using Sigurd 230/230 kV phase shifting
transformer to reverse power flow (southbound). Based on the
transformer heat test on heat-run program, Grid Ops will have at
least 2 hours to utilize the phase shifting transformer to adjust the
system before the remaining transformer trips (before the transformer
temperature reaches 130°C).
Therefore, Sigurd RAS is classified as a LAPS.
Sigurd RAS Classification
8
Protection & Control
9
10
Sigurd Substation
11
Elements of Sigurd Substation Involved in the RAS
12
Redundant Current and Voltage Reading to Compute Power
in the RAS Controllers
Sigurd Substation
85A 85B
M
M
M
NORTH 345kV BUS
SOUTH 345kV BUS
233230232
243240242
EAST230kV BUS
WEST230kV BUS XFMR6
XFMR5
TOPAVANT
TO SIGURDSOLARQ0589
S(XFMR6)
S(XFMR5)
383A
382A
381A
VTX
VTY
SIGURD SOLAR
Q0589
RAS WILL TRIP THESE CB
~0.3 mile
13
Logic to Detect If Either Transformer is out of Service
Sigurd Substation
85A 85B
M
M
M
NORTH 345kV BUS
SOUTH 345kV BUS
233230232
243240242
EAST230kV BUS
WEST230kV BUS XFMR6
XFMR5
TOPAVANT
TO SIGURDSOLARQ0589
AND
OR
52b240
52b243
AND
89b381A
89b382A
AND
OR
52b230
52b233
AND
89b383A
89b382A
XFMR5 OUT OF SERVICE
XFMR6 OUT OF SERVICE
383A
382A
381A
14
AND
OR
52b240
52b243
AND
89b381A
89b382A
XFMR5 OUT OF SERVICE
AND
OR
52b240
AND
89b381A
89b382A
XFMR5 OUT OF SERVICE
OR
43M240
52b243
OR
43M243
SIMPLIFIED
VERSION
VERSION
USING
MAINTENANCE
SWITCH
Use of Maintenance Switch 43M
240
243
15
RAS-A Controller Basic Logic
85A (RAS A)
SEL-751
AND
IN401
OR TRIP CB 240 [TC1]
TRIP CB 242 [TC1]
ANNUNCIATOR
RTU (85A TRIP)
RTU (85A ENABLED)
85A HARDWARE ALARM
ON
OFF
43RAS-AOR
OR
RTU [RAS ON]
RTU [RAS OFF]
LOCAL [RAS OFF]
LOCAL[RAS ON]
TO RTU
IN101
HALARM
SALARM
OR
ANN RAS-A DISABLED
IN402
XFMR5 OUT OF SERVICE
XFMR6 OUT OF SERVICE
OUT302
OUT303
OUT301
OUT304
OUT103
COMM2 DNP 3.0TO RTU
AND
OR
52b240
52b243
AND
89b381A
89b382A
AND
OR
52b230
52b233
AND
89b383A
89b382A
DTT TRIP TO Q0589 230kV CB(CHANNEL 1)
TMB1
TMB2
COMM1
|S(XFMR5)|+|S(XFMR6)|
497MVA
T1
T2
RAS A ARMEDRAS A ARMED
ALARM
OUT305
16
RAS-B Controller Basic Logic
85B (RAS B)
SEL-751
AND
IN401
OR TRIP CB 240 [TC1]
TRIP CB 242 [TC2]
ANNUNCIATOR
RTU (85B TRIP)
RTU (85B ENABLED)
85B HARDWARE ALARM
ON
OFF
43RAS-BOR
OR
RTU [RAS ON]
RTU [RAS OFF]
LOCAL [RAS OFF]
LOCAL[RAS ON]
TO RTU
IN101
HALARM
SALARM
OR
ANN RAS-B DISABLED
IN402
XFMR5 OUT OF SERVICE
XFMR6 OUT OF SERVICE
OUT302
OUT303
OUT301
OUT304
OUT103
COMM2 DNP 3.0TO RTU
AND
OR
52b240
52b243
AND
89b381A
89b382A
AND
OR
52b230
52b233
AND
89b383A
89b382A
DTT TRIP TO Q0589 230kV CB(CHANNEL 1)
TMB1
TMB2
COMM1
|S(XFMR5)|+|S(XFMR6)|
497MVA
T1
T2
RAS B ARMEDRAS B ARMED
ALARM
OUT305
• FULL REDUNDANCY
• EMS CAN ENABLE AND DISABLE THE CONTROLERS
• EMS CAN CHANGE THE SET POINT OF THE POWER
LEVEL DETECTORS
EMS Operation Philosophy
(RAS A and RAS B)
17
• RAS ENABLED/DISABLED
• RAS ARMED
• RAS HARDWARE FAILURE – ALARM
• RAS OPERATION (TRIP)
List of Alarms and Signals to the EMS
(RAS A and RAS B)
18
Telecommunication
19
20
Telecommunication
PacifiCorp requests WECC RASRS accept Sigurd RAS as a LAPS.
Sigurd RAS – LAPS
21
Questions?
22