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