System Impact Study 2009 T1 Transformer Replacement at Badwater Substation

Transcription

1 System Impact Study 2009 T1 Transformer Replacement at Badwater Substation July 2010 Rocky Mountain Region

2 Index Executive Summary...3 I. Introduction...4 II. Methodology...4 A. Monitored Paths...4 III. Base Case...5 IV. Criteria...5 A. System Intact...5 B. Contingencies...5 V. Results...5 A. Category A...5 B. Category B...6 C. Category C...6 VII. Conclusion...6 Appendices...8 A. Single Line Diagrams Voltage Legend System in-tact with Project Option 1a System in-tact with Project Option 2a System in-tact with Project Option 3a Badwater - Spence line contingency Option 1a System in-tact with project Option 1b Badwater Spence 230 kv line contingency Option 1b Badwater Lost Cabin System Model Option 3a...15 B. Contingency Legend(full)...16 C. Monitored Buses...19 D. Monitored Elements Branches Two Winding Transformers Three Winding Transformers

3 Executive Summary Interconnection queue position 2009-T1 requested a modification to Western s Badwater substation point of delivery on October 17 th, Modification includes increasing load, thereby requiring the replacement of Western s 230/69 kv 30 MVA transformer, KV1A, with a 230/69 kv 83 MVA transformer. Other options studied include addition of a second 83 MVA transformer and replacement of both Western s 230/69 30 MVA and Tri-State s 230/69 kv 50 MVA transformers with two 230/69 kv 150 MVA transformers. New transformers will be supplied by the requestor. Historical load data of a 60 MW peak and requestor increases of 34 MW (total) were used in case simulations. Power flow and contingency analysis was performed with a total 94 MW load prediction. With a 94 MW load simulation, power flow analysis showed no criteria violations at the 230 kv bus. Placement of the proposed CO 2 Plant on the existing KV1B 50 MVA transformer feeder circuit will result in overloading of the transformer if the 69 kv bus is operated as an open ring bus. In the event voltage at the 69 kv bus is not acceptable to the requestor, it will be the requestor s responsibility to install necessary reactive devices to achieve desired bus voltages. 3

4 Introduction Interconnection queue position 2009-T1 requested an increase in transmission service at Badwater Substation to serve load associated with infrastructure additions. The delivery point will remain the same; however, an increase to existing service was requested. Additions include the MBE compressor station and CO 2 plant. The existing Western owned transformer, KV1A, is a 230/69 kv - 18/24/30 MVA unit that will not accommodate the requested increase. Simulating the replacement of KV1A with a new 83 MVA unit (future KV1C) and an additional 34 MW of load will be the focus of this study. Current plans are to leave Western s KV1A in place for emergency and maintenance situations. As of this writing, the best estimate for load increase of Lost Cabin #3 Substation is 4 MW. The MBE compressor sub is 5 MW (down from initial estimate of 16 MW) and 25 MW (up from initial estimate of 20 MW) for the CO 2 plant, totaling 34 MW. This study will be performed and valid only for the additional 34 MW request. Changes or increases to these estimates will require a new service request and re-study. Historical real time load data show a (maximum) 47 MW load at Badwater substation. The sum of non-coincident peaks for the three 69 kv lines over the time period results in a possible maximum of 60 MW. This peak load value (60 MW) plus predicted future additions (4, 5 and 25 MW), sum to a total peak of 94 MW, was simulated in power flow analysis. I. Methodology A. This request is located at Badwater substation, which is one end of an element that is part of the TOT 4B definition. Typically, a transmission request across or any generation addition to a constrained path requires consideration and additional study. This will be performed subsequent to this study. Western was requested to evaluate three options for proposed changes to the 115/69 kv transformer configuration and the 69 kv ring bus configuration at Badwater. The three options were: 1. Replace the 18/24/30 MVA transformer with a 50/67/83 MVA transformer and operate with the ring bus open, as is present operation 2. Replace the 18/24/30 MVA transformer with two 50/67/83 MVA transformers and close the ring bus for normal operation 4

5 3. Replace both existing transformers with two matched 150 MVA transformers and operate with the ring bus closed The requestor has not yet identified if the new CO 2 plant will be connected to the circuit emanating from the 30 MVA (KV1A) transformer or the circuit emanating from the 50 MVA (KV1B) transformer. The three options were also studied for connecting the CO 2 plant to each of the 69 kv circuits. Option suffix a was used to indicate the plant on the KV1A circuit and suffix b was used to indicate operation on the KV1B circuit. II. Base Case A. For purposes of this study, a modified WECC 2010HS base case was used, as the expected in service date is Line and equipment ratings as well as localized loads were compared to most current available and updated where applicable. The 69 kv system behind the Badwater transformers was modeled to the extent possible from the projected load information provided by the requestor. III. Criteria A. System Intact Voltages will remain within the required 0.95 to 1.05 per unit range. Transmission lines and transformers may not exceed 100 % of their nominal rating. B. Contingencies Voltages will remain between 0.90 and 1.10 per unit for category B contingencies. Transmission lines and transformers may not exceed either 100% of their nominal rating or an established emergency rating. IV. Results A. For the System Intact, under N-0 or Category A, the 50 MVA transformer (KV1B) is 128.6% overloaded in option 1b and the voltage on the 69 kv bus connected to KV1B is below 0.95 pu. While the plant does not cause overloading of the KV1C 83 MVA, or 150 5

6 MVA, transformers in options 1a, 2a and 3a, the addition of the plant on that feeder does result in what Western would consider to be overloads on the 69 kv feeder circuit to the plant. Upgrading these lines to 795 ACSR would not only relieve the overload of these lines but also reduce the voltage drop along the line, resulting in higher voltage for the system. B. Under N-1 or Category B contingencies, some overloads or voltage violations were encountered. For option 1a, both 69 kv bus sections have voltages below 0.90 p.u. for an outage of the Badwater-Spence 230 kv line. The KV1C section experiences low voltage for an outage of the Badwater - Thermopolis 230 kv line. In option 1b, the 69 kv bus section fed by KV1B experiences a voltage below 0.90 p.u. for an outage of the Badwater-Spence 230 kv line and for an outage of the Badwater-Thermopolis 230 kv line. C. Under N-2 or Category C contingencies, no overloads or voltage violations were encountered. D. A sensitivity was run for the five year time frame to see the impact of system future load increases at Badwater. While the operating voltage at the 230 kv and 69 kv buses are within the allowable range for the system intact, the voltages along the 69 kv feeders drop below acceptable levels for an outage of the Badwater-Spence 230 kv line. This condition is only alleviated with the option of replacing both transformers with 150 MVA transformers. E. Increasing the capacity of the transformers results in increased voltage during motor startup as the transformer does not start drawing down voltage until the power drawn meets the rating of the transformer. Additionally, the reduced impedance of the larger transformers results in higher voltages in the 69 kv feeder system prior to motor startup. V. Conclusion A comprehensive set of Category B and selected Category C contingencies were run as listed in: Appendix B Contingency Legend. Geographically relevant 230/115 kv transformer overloads and bus voltages were monitored and simulated as listed in: Appendix D Monitored Elements. Under option 1, the 69 kv buses are very near or below the low voltage limit under system intact operation and are below the voltage limit for certain N-1 conditions. Also, without upgrades to the 69 kv system, voltages along the 69 kv system may reach unacceptably low voltage 6

7 levels during system intact operation. Additionally, increased loading in the area along with increased loads at Badwater will only serve to draw the voltage lower in future years. Under option 2, the voltages stay within acceptable limits for system intact and contingency operations. However, future operating conditions again lead to undervoltage situations in the 69 kv system for certain N-1 contingencies. Under option 3, voltages in both the present and near future cases show no voltage issues under either system intact or contingency operating conditions. The requested load increase presents no operating violations to voltages at Western s Badwater 230 kv bus. Any upgrades and/or additions required need to be performed to Western s design standards. Additionally, because the 69 kv system modeling is based on the switching diagram provided by the requestor, bus voltage deviations may not be accurately reflected in attached diagrams. As such, Western is satisfied its service at the 230 kv bus will meet voltage requirements. 7

8 Appendices A. Single Line Diagrams 1. Voltage Legend

9 2. System in-tact with Project Option 1a

10 3. System in-tact with Project Option 2a 10

11 4. System in-tact with Project Option 3a 11

12 5. Badwater - Spence line contingency Option 1a 12

13 6. System in-tact with project Option 1b 13

14 7. Badwater Spence line contingency Option 1b 14

15 8. Badwater Lost Cabin System Model Option 3a 15

16 B. Contingency Legend(full) LABEL EVENTS TKL-WDSTR : TRIP LINE FROM BUS [ANT MINE ] TO BUS [YELLOWCK ] CKT 1 TRIP LINE FROM BUS [YELLOWCK ] TO BUS [WINDSTAR ] CKT 1 TRIP LINE FROM BUS [TEKLA ] TO BUS [ANT MINE ] CKT 1 CDR-PUB : TRIP LINE FROM BUS [CARR DRA ] TO BUS [BARBERCK ] CKT 1 TRIP LINE FROM BUS [PUMPKIN ] TO BUS [BARBERCK ] CKT 1 CPL-GLD : TRIP LINE FROM BUS [CASPERPP ] TO BUS [REFNRYTP ] CKT 1 TRIP LINE FROM BUS [REFNRYTP ] TO BUS [DAVEJTPS ] CKT 1 TRIP LINE FROM BUS [DAVEJTPS ] TO BUS [DAVEJOHN ] CKT 1 TRIP LINE FROM BUS [DAVEJTPS ] TO BUS [WAGHN ST ] CKT 1 TRIP LINE FROM BUS [WAGHN ST ] TO BUS [GLENDO ] CKT 1 CAS-GLD : TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [DAVEJTPN ] CKT 1 TRIP LINE FROM BUS [DAVEJTPN ] TO BUS [CASPERLM ] CKT 1 TRIP LINE FROM BUS [DAVEJTPN ] TO BUS [WAGHN NT ] CKT 1 TRIP LINE FROM BUS [WAGHN NT ] TO BUS [GLENDO ] CKT 1 LV-TH : TRIP LINE FROM BUS [HILLTP ] TO BUS [WORLANTP ] CKT 1 TRIP LINE FROM BUS [WORLANTP ] TO BUS [BASIN ] CKT 1 TRIP LINE FROM BUS [BASIN ] TO BUS [NAHNEJEN ] CKT 1 TRIP LINE FROM BUS [LOVELL ] TO BUS [NAHNEJEN ] CKT 1 TRIP LINE FROM BUS [THERMOPL ] TO BUS [WORLANTP ] CKT 1 A-B : TRIP LINE FROM BUS [ALCOVA ] TO BUS [RADERVIL ] CKT 1 TRIP LINE FROM BUS [BOYSEN ] TO BUS [COPPERMT ] CKT 1 TRIP LINE FROM BUS [COPPERMT ] TO BUS [RADERVIL ] CKT 1 BGG-TH : TRIP LINE FROM BUS [BGEORGE ] TO BUS [MEETSETP ] CKT 1 TRIP LINE FROM BUS [CARTERMT ] TO BUS [MEETSETP ] CKT 1 TRIP LINE FROM BUS [CARTERMT ] TO BUS [THERMOPL ] CKT 1 B-PB : TRIP LINE FROM BUS [BOYSEN ] TO BUS [HARRSBRG ] CKT 1 TRIP LINE FROM BUS [PILOT BU ] TO BUS [HARRSBRG ] CKT 1 LV-NC : TRIP LINE FROM BUS [GARLAND ] TO BUS [LOVELL ] CKT 1 TRIP LINE FROM BUS [GARLAND ] TO BUS [POWELLTP ] CKT 1 TRIP LINE FROM BUS [POWELLTP ] TO BUS [RALSTON ] CKT 1 TRIP LINE FROM BUS [N. CODY ] TO BUS [RALSTON ] CKT 1 SNG-HJ : TRIP LINE FROM BUS [GEMCTYTP ] TO BUS [HAPPYJCK ] CKT 1 TRIP LINE FROM BUS [GEMCTYTP ] TO BUS [SNOWYRNG ] CKT 1 HJ-WAF : TRIP LINE FROM BUS [HAPPYJCK ] TO BUS [CORLETT ] CKT 1 TRIP LINE FROM BUS [CORLETT ] TO BUS [WARRENLM ] CKT 1 HMD-TH : TRIP LINE FROM BUS [HDOME ] TO BUS [JIMRDYTP ] CKT 1 TRIP LINE FROM BUS [TCAPS ] TO BUS [JIMRDYTP ] CKT 1 TRIP LINE FROM BUS [TCAPS ] TO BUS [THERMOPL ] CKT 1 K-MM : TRIP LINE FROM BUS [KORTES ] TO BUS [KORTESTP ] CKT 1 TRIP LINE FROM BUS [KORTESTP ] TO BUS [MIRACLEM ] CKT 1 TRIP LINE FROM BUS [KORTESTP ] TO BUS [SEMINOE ] CKT 1 SNG-MM_115 : TRIP LINE FROM BUS [LARAMIE ] TO BUS [SNOWYRNG ] CKT 1 TRIP LINE FROM BUS [LARAMIE ] TO BUS [OASISTAP ] CKT 1 TRIP LINE FROM BUS [MIRACLEM ] TO BUS [MEDBOWTP ] CKT 1 TRIP LINE FROM BUS [OASISTAP ] TO BUS [MEDBOWTP ] CKT 1 PB-RVT : TRIP LINE FROM BUS [PILOT BU ] TO BUS [WINDRIVT ] CKT 1 TRIP LINE FROM BUS [RIVERTON ] TO BUS [WINDRIVT ] CKT 1 MM-S : TRIP LINE FROM BUS [MIRACLEM ] TO BUS [SEMINOTP ] CKT 1 TRIP LINE FROM BUS [SEMINOE ] TO BUS [SEMINOTP ] CKT 1 AU_LRS*G.RE : TRIP LINE FROM BUS [AULT ] TO BUS [LAR.RIVR ] CKT 1 DECREASE BUS [MBPP ] GENERATION BY 210 MW DECREASE BUS [MBPP ] GENERATION BY 210 MW LRS_STY*G.RE: TRIP LINE FROM BUS [LAR.RIVR ] TO BUS [STORY ] CKT 1 DECREASE BUS [MBPP ] GENERATION BY 210 MW DECREASE BUS [MBPP ] GENERATION BY 210 MW BDW_AC : TRIP LINE FROM BUS [A&C-'SIDE' ] TO BUS [BADWATER ] CKT 1C BDW_B : TRIP LINE FROM BUS [BADWATER ] TO BUS [B-'SIDE' ] CKT 1B ATLAN_ROCKS : TRIP LINE FROM BUS [ATLANTIC ] TO BUS [ROCKSPGS ] CKT 1 ATLAN_WYOPO : TRIP LINE FROM BUS [ATLANTIC ] TO BUS [WYOPO ] CKT 1 ATLAN-COLGEN: TRIP LINE FROM BUS [ATLANTIC ] TO BUS [COL GEN ] CKT 1 ATLAN-AT_REA: TRIP LINE FROM BUS [ATLANTIC ] TO BUS [ATLANREA ] CKT 1 BDW-SCE : TRIP LINE FROM BUS [BADWATER ] TO BUS [SPENCE ] CKT 1 BDW-THE : TRIP LINE FROM BUS [BADWATER ] TO BUS [THERMOPL ] CKT 1 BAIR_WHISK : TRIP LINE FROM BUS [BAIROIL ] TO BUS [WHISKEYP ] CKT 1 BARX-BTRCK : TRIP LINE FROM BUS [BAR-X ] TO BUS [BITR CRK ] CKT 1 BARX-ECHO : TRIP LINE FROM BUS [BAR-X ] TO BUS [ECHOSPRG ] CKT 1 BRIDG_MUSTA : TRIP LINE FROM BUS [BRIDGER ] TO BUS [MUSTANG ] CKT 1

17 BRIDG_PTROCK: TRIP LINE FROM BUS [BRIDGER ] TO BUS [PT ROCKS ] CKT 1 BRIDG_RKSPGS: TRIP LINE FROM BUS [BRIDGER ] TO BUS [ROCKSPGS ] CKT 1 BUFF-CDW : TRIP LINE FROM BUS [BUFFALO ] TO BUS [CARR DRA ] CKT 1 BUFF-KC : TRIP LINE FROM BUS [BUFFALO ] TO BUS [KAYCEE ] CKT 1 BUFF-SHI : TRIP LINE FROM BUS [BUFFALO ] TO BUS [SHERIDAN ] CKT 1 CDW-WYODAK : TRIP LINE FROM BUS [CARR DRA ] TO BUS [WYODAK ] CKT 1 CDW-BRB : TRIP LINE FROM BUS [CARR DRA ] TO BUS [BARBERCK ] CKT 1 CPL115 : TRIP LINE FROM BUS [CASPERPP ] TO BUS [CASPERPP ] CKT 1 CPL-DJ : TRIP LINE FROM BUS [CASPERPP ] TO BUS [DAVEJOHN ] CKT 1 CPL-CLMJMP : TRIP LINE FROM BUS [CASPERPP ] TO BUS [CLAIMJMP ] CKT 1 CPL-RVT : TRIP LINE FROM BUS [CASPERPP ] TO BUS [RIVERTON ] CKT 1 CPL-SCE : TRIP LINE FROM BUS [CASPERPP ] TO BUS [SPENCE ] CKT 1 CPL-LAT : TRIP LINE FROM BUS [CASPERPP ] TO BUS [LATIGO ] CKT 1 CPL-CTRST : TRIP LINE FROM BUS [CASPERPP ] TO BUS [CENTERST ] CKT 1 CPL-CAS : TRIP LINE FROM BUS [CASPERPP ] TO BUS [CASPERLM ] CKT 1 CPL-69 : TRIP LINE FROM BUS [CASPERPP ] TO BUS [CASPERWD ] CKT 1 DJ115 : TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [DAVEJOHN ] CKT 1 DJ-DY : TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [DIFICULT ] CKT 1 DJ_WNDSTR1 : TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [WINDSTAR ] CKT 1 DJ_WNDSTR2 : TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [WINDSTAR ] CKT 2 DJ_LRS : TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [LAR.RIVR ] CKT 1 DY_AEOLUS : TRIP LINE FROM BUS [DIFICULT ] TO BUS [AEOLUS ] CKT 1 FHO_LTM : TRIP LINE FROM BUS [FIREHOLE ] TO BUS [LITTLEMT ] CKT 1 FHO_RKSP : TRIP LINE FROM BUS [FIREHOLE ] TO BUS [ROCKSPGS ] CKT 1 GTDIV_MUS : TRIP LINE FROM BUS [GREATDIV ] TO BUS [MUSTANG ] CKT 1 KC-MDWE : TRIP LINE FROM BUS [KAYCEE ] TO BUS [MIDWEST ] CKT 1 CLMJMP-MDWE : TRIP LINE FROM BUS [CLAIMJMP ] TO BUS [MIDWEST ] CKT 1 MINE115 : TRIP LINE FROM BUS [MINERS ] TO BUS [MINERS ] CKT 1 MINE-PLA : TRIP LINE FROM BUS [MINERS ] TO BUS [PLATTE ] CKT 1 MINE-FREEZE : TRIP LINE FROM BUS [MINERS ] TO BUS [FREEZOUT ] CKT 1 MUS115_1 : TRIP LINE FROM BUS [MUSTANG ] TO BUS [MUSTANG ] CKT 1 MUS115_2 : TRIP LINE FROM BUS [MUSTANG ] TO BUS [MUSTANG ] CKT 2 MUS-SCE : TRIP LINE FROM BUS [MUSTANG ] TO BUS [SPENCE ] CKT 1 PAL-RCKSPR : TRIP LINE FROM BUS [PALISADE ] TO BUS [ROCKSPGS ] CKT 1 PLA115 : TRIP LINE FROM BUS [PLATTE ] TO BUS [PLATTE ] CKT 1 PLA-LAT : TRIP LINE FROM BUS [PLATTE ] TO BUS [LATHAM ] CKT 1 PLA-TRO : TRIP LINE FROM BUS [PLATTE ] TO BUS [TROWBRDG ] CKT 1 PLA-WHISK : TRIP LINE FROM BUS [PLATTE ] TO BUS [WHISKEYP ] CKT 1 PTRCK-RCKSPG: TRIP LINE FROM BUS [PT ROCKS ] TO BUS [ROCKSPGS ] CKT 1 PTROCK-BTRCK: TRIP LINE FROM BUS [PT ROCKS ] TO BUS [BITR CRK ] CKT 1 RVT-THE : TRIP LINE FROM BUS [RIVERTON ] TO BUS [THERMOPL ] CKT 1 RVT-WYOPO : TRIP LINE FROM BUS [RIVERTON ] TO BUS [WYOPO ] CKT 1 THE115_1 : TRIP LINE FROM BUS [THERMOPL ] TO BUS [THERPACE ] CKT 1 THE115_2 : TRIP LINE FROM BUS [THERMOPL ] TO BUS [THERPACE ] CKT 2 THE-KIRBY : TRIP LINE FROM BUS [THERPACE ] TO BUS [KIRBY CK ] CKT 1 THE-TH_1 : TRIP LINE FROM BUS [THERPACE ] TO BUS [THERMOPL ] CKT 1 THE-TH_2 : TRIP LINE FROM BUS [THERPACE ] TO BUS [THERMOPL ] CKT 2 YCK-WINDSTR : TRIP LINE FROM BUS [YELLOWCK ] TO BUS [WINDSTAR ] CKT 1 HLL-KIRBY : TRIP LINE FROM BUS [HILLTP ] TO BUS [KIRBY CK ] CKT 1 KIRBY : TRIP LINE FROM BUS [KIRBY CK ] TO BUS [KIRBY CR ] CKT 1 LAT-ECHO : TRIP LINE FROM BUS [LATHAM ] TO BUS [ECHOSPRG ] CKT 1 AEOL-FREEZ : TRIP LINE FROM BUS [AEOLUS ] TO BUS [FREEZOUT ] CKT 1 WNDST-GLENRK: TRIP LINE FROM BUS [WINDSTAR ] TO BUS [GLENROCK ] CKT 1 WNDST-LATIGO: TRIP LINE FROM BUS [WINDSTAR ] TO BUS [LATIGO ] CKT 1 CTRST-BRY : TRIP LINE FROM BUS [CENTERST ] TO BUS [BRYAN ] CKT 1 BRY-REFPP : TRIP LINE FROM BUS [BRYAN ] TO BUS [REFNRYPP ] CKT 1 REFPP-ELK : TRIP LINE FROM BUS [REFNRYPP ] TO BUS [ELKHORN ] CKT 1 A-CAS_1 : TRIP LINE FROM BUS [ALCOVA ] TO BUS [CASPERLM ] CKT 1 A-CAS_2 : TRIP LINE FROM BUS [ALCOVA ] TO BUS [CASPERLM ] CKT 2 A-FC : TRIP LINE FROM BUS [ALCOVA ] TO BUS [FREMONT ] CKT 1 A-MM_1 : TRIP LINE FROM BUS [ALCOVA ] TO BUS [MIRACLEM ] CKT 1 A-MM_2 : TRIP LINE FROM BUS [ALCOVA ] TO BUS [MIRACLEM ] CKT 2 BGG69 : TRIP LINE FROM BUS [BGEORGE ] TO BUS [BGEORGE ] CKT 1 B-TH : TRIP LINE FROM BUS [BOYSEN ] TO BUS [THERMOPL ] CKT 1 BBS-HM : TRIP LINE FROM BUS [BUFFBILL ] TO BUS [HEART MT ] CKT 1 BBS-NCDY : TRIP LINE FROM BUS [BUFFBILL ] TO BUS [N. CODY ] CKT 1 BBS-BBP : TRIP LINE FROM BUS [BUFFBILL ] TO BUS [BUFFBLPP ] CKT 1 CTM69 : TRIP LINE FROM BUS [CARTERMT ] TO BUS [CARTERMT ] CKT 1 FC1 : TRIP LINE FROM BUS [FREMONT ] TO BUS [FREMONT ] CKT 1 FC2 : TRIP LINE FROM BUS [FREMONT ] TO BUS [FREMONT ] CKT 1 NJ-GRBL : TRIP LINE FROM BUS [GREYBULL ] TO BUS [NAHNEJEN ] CKT 1 17

18 HDM_69 : TRIP LINE FROM BUS [HDOME ] TO BUS [HDOME ] CKT 1 HM-NCDY : TRIP LINE FROM BUS [HEART MT ] TO BUS [N. CODY ] CKT 1 K-MM : TRIP LINE FROM BUS [KORTES ] TO BUS [MIRACLEM ] CKT 1 LV69 : TRIP LINE FROM BUS [LOVELL ] TO BUS [LOVELL ] CKT 1 MM230 : OPEN LINE FROM BUS [MIRACLEM ] TO BUS [MIRACLEM ] TO BUS [MM_LV ] CKT 1 PB69_1 : TRIP LINE FROM BUS [PILOT BU ] TO BUS [PILOT BU ] CKT 1 PB69_2 : TRIP LINE FROM BUS [PILOT BU ] TO BUS [PILOT BU ] CKT 2 RADER_ERVAY : TRIP LINE FROM BUS [RADERVIL ] TO BUS [ERVAYBAS ] CKT 1 BBP-GEN1 : TRIP LINE FROM BUS [BUFFBLPP ] TO BUS [BBILL ] CKT 1 DUTN-ERVAY : TRIP LINE FROM BUS [DUTONBAS ] TO BUS [ERVAYBAS ] CKT 1 BBP_GEN3 : TRIP LINE FROM BUS [BUFFBLPP ] TO BUS [BBILL ] CKT 1 BBN-CM : TRIP LINE FROM BUS [BUFBASIN ] TO BUS [CMTDUM ] CKT 1 HDM_CM : TRIP LINE FROM BUS [HDOME ] TO BUS [CMTDUM ] CKT 1 SNG230 : OPEN LINE FROM BUS [SNOWYRNG ] TO BUS [SNOWYRNG ] TO BUS [SNG_LV ] CKT 1 MM-SNG : TRIP LINE FROM BUS [SNOWYRNG ] TO BUS [MIRACLEM ] CKT 1 PUB-DCK : TRIP LINE FROM BUS [PUMPKIN ] TO BUS [BARBERCK ] CKT 1 DJ_WNDST-DBL: TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [WINDSTAR ] CKT 1 TRIP LINE FROM BUS [DAVEJOHN ] TO BUS [WINDSTAR ] CKT 2 THE-TH-DBL : TRIP LINE FROM BUS [THERPACE ] TO BUS [THERMOPL ] CKT 1 TRIP LINE FROM BUS [THERPACE ] TO BUS [THERMOPL ] CKT 2 A-CAS-DBL : TRIP LINE FROM BUS [ALCOVA ] TO BUS [CASPERLM ] CKT 1 TRIP LINE FROM BUS [ALCOVA ] TO BUS [CASPERLM ] CKT 2 A-MM-DBL : TRIP LINE FROM BUS [ALCOVA ] TO BUS [MIRACLEM ] CKT 1 TRIP LINE FROM BUS [ALCOVA ] TO BUS [MIRACLEM ] CKT 2 THE-THE-115 : TRIP LINE FROM BUS [THERMOPL ] TO BUS [THERPACE ] CKT 1 TRIP LINE FROM BUS [THERMOPL ] TO BUS [THERPACE ] CKT 2 BDW_1C : TRIP LINE FROM BUS [A&C-'SIDE' ] TO BUS [BADWATER ] CKT 1C BDW_2C : TRIP LINE FROM BUS [A&C-'SIDE' ] TO BUS [BADWATER ] CKT 2C 18

19 C. Monitored Buses 1 GP1&2 2 CO2 3 LC3 4 AMOCO 5 PLATTE 101 GP3 102 CO2 103 MBETP 104 MBE 201 LCPUMP ANT MINE ATLANTIC BADWATER B-'SIDE' A&C-'SIDE' BAIROIL BAIROIL BAIROIL BAR-X BAR-X BRIDGER BRIDGER BUFFALO CARR DRA CASPERPP CASPERPP CASPERPP CENTERST BRYAN REFNRY REFNRY ELKHORN DAVEJOHN DAVEJOHN DAVEJOHN DIFICULT FIREHOLE FIREHOL FT CREEK GREATDIV GREATDIV KAYCEE LITTLEMT CLAIMJMP MIDWEST MIDWEST MINERS MINERS MUSTANG MUSTANG MUDDYCRK MUDYCRK PALISADE PLATTE PLATTE PLATTE TROWBRDG PT ROCKS PT ROCKS RIVERTON ROCKSPGS ROCKSPGS SHERIDAN SHERIDAN SPENCE THERMOPL THERPACE WHISKEYP WYODAK WYOPO WYOPO YELLOWCK ANT MINE ARCH BUFFALO CASPERPP COL GEN HILLTOP HILLTOP HILLTP MEDBOWCO MINERS RIVERTON KIRBY CK KIRBY CR YELLOWCK COL GEN LATHAM BITR CRK ECHOSPRG LATHAM FIREHOL AEOLUS WINDSTAR CENTERST BRYAN REFNRYPP ELKHORN ATLANREA FREEZOUT GLENROCK GLENRK GLENRK GLENRKG GLENRKG GLENRK GLENRK MTNWD MTNWD MTNWD MTNWD MTNWD G MTNWD G MTNWD G MTNWD G MIHILL MIHILL MIHL G HIPLANE HIPLN_CL HIPLN_SL HIPLN_G THREEBUT THREEB THREB_CL THREB_SL THREB_G CASPERWD CASPERWD CASPW LS CASPW TR CASPW G1

20 69512 LATIGO ARMINTO ALCOVA ARCHER ARCHER BASIN BGEORGE BGEORGE BOYSEN BUFFBILL CARTERMT CARTERMT CASPERLM CHEYENNE COPPERMT FREMONT GARLAND GEMCTYTP GLENDLTP GLENDO DAVEJTPN DAVEJTPS GREYBULL GUERNTAP HAPPYJCK HDOME HEART MT JIMREADY KORTES KORTESTP LAGRANGE LAR.RIVR LAR.RIVR LARAMIE LINGLE LOVELL LOVELL LYMAN MAY MBPP MBPP MED BOW MIRACLEM MYERS MYERS TP N. CODY OASISTAP PILOT BU PINEBLUF PODOLAK POLE CK POWELLTP QUALLS RADERVIL RALSTON REFNRYTP RIVERTON ROUNDTOP SEMINOE SEMINOTP SENTINEL SKYLINE SPRINGCK TCAPS THERMOPL TORRNGTN WINDRIVR WINDRIVT WORLANTP JIMRDYTP LINGLETP LYMANTP ALCOVA BOYSEN BBILL DUTONBAS ERVAYBAS GARCANPP GARCANPP HEART MT NAHNEJEN PILOT BU PILOT BU PILOT BU RALSTON SHOSHONE CORLETT FREMONT FREMONT GLENDO GLENDO GUERNSY JACKLOPE KORTES KORTES KORTES LIMESTON LIMESTON MEDBOWHS MEDBOWTP SMNOE WARMSPGS WAGNHNDS FTSANDER GUERNRRL WARRENLM BUFFBLPP ALCOVA BBILL SEMINOE GUERNSY SPIRTMTN HARRSBRG CROWCRK BUFBASIN HDOME CMTDUM MEETSETP CHEYENNE WHTROCK WHTROCK SNOWYRNG SNOWYRNG MIRACLEM WHEATLND LAR.RIVR WAGHN NT WAGHN ST EMIGRNT EMI TAP MM_LV SNG_LV PUMPKIN BARBERCK 20

21 D. Monitored Elements 1. Branches. 1 GP1& CO CO LC LC AMOCO AMOCO PLATTE PLATTE A&C-'SIDE' GP CO CO MBETP MBETP MBE MBETP B-'SIDE' LCPUMP A&C-'SIDE' ANT MINE YELLOWCK ANT MINE TEKLA ATLANTIC ROCKSPGS ATLANTIC WYOPO ATLANTIC COL GEN ATLANTIC ATLANREA BADWATER SPENCE BADWATER THERMOPL B-'SIDE' A&C-'SIDE' BAIROIL GREATDIV BAIROIL WHISKEYP BAR-X BITR CRK BAR-X ECHOSPRG MANSFACE FIREHOLE BRIDGER MUSTANG BRIDGER PT ROCKS BRIDGER ROCKSPGS BUFFALO CARR DRA BUFFALO KAYCEE BUFFALO SHERIDAN CARR DRA WYODAK CARR DRA BARBERCK CARR DRA DRYFORK CASPERPP DAVEJOHN CASPERPP CLAIMJMP CASPERPP RIVERTON CASPERPP SPENCE CASPERPP LATIGO CASPERPP CENTERST CASPERPP CASPERLM CASPERPP REFNRYTP

22 65306 CASPERPP CASPERWD REFNRY REFNRY DAVEJOHN DIFICULT DAVEJOHN WINDSTAR DAVEJOHN WINDSTAR DAVEJOHN LAR.RIVR DAVEJOHN STEGALL DAVEJOHN DAVEJTPN DAVEJOHN DAVEJTPS DIFICULT AEOLUS FIREHOLE LITTLEMT FIREHOLE ROCKSPGS FT CREEK MINERS FT CREEK HIPLANE GREATDIV MUSTANG KAYCEE MIDWEST LITTLEMT FLAMGORG CLAIMJMP MIDWEST MINERS PLATTE MINERS FREEZOUT MUSTANG SPENCE MUDDYCRK MUDYCRK MUDDYCRK STR MUDDYCRK LONGHOLW PALISADE RAVEN PALISADE ROCKSPGS PLATTE LATHAM PLATTE TROWBRDG PLATTE WHISKEYP PT ROCKS ROCKSPGS PT ROCKS BITR CRK RIVERTON THERMOPL RIVERTON WYOPO SHERIDAN TONGRIVR THERPACE KIRBY CK THERPACE THERMOPL THERPACE THERMOPL WYODAK OSAGE WYODAK HUGHES WYODAK DONKYCRK YELLOWCK WINDSTAR ARCH MEDBOWCO ARCH MINERS HILLTP KIRBY CK HILLTP WORLANTP KIRBY CK KIRBY CR

23 67499 LATHAM ECHOSPRG AEOLUS FREEZOUT WINDSTAR GLENROCK WINDSTAR LATIGO CENTERST BRYAN BRYAN REFNRYPP REFNRYPP ELKHORN REFNRYPP REFNRYTP GLENRK GLENRK GLENRK GLENRK MTNWD MTNWD MTNWD MTNWD MIHILL MIHILL HIPLN_CL HIPLN_SL THREEBUT THREEB THREEBUT LATIGO THREB_CL THREB_SL CASPERWD CASPW LS ARMINTO RADERVIL ALCOVA CASPERLM ALCOVA CASPERLM ALCOVA FREMONT ALCOVA MIRACLEM ALCOVA MIRACLEM ALCOVA RADERVIL ARCHER CHEYENNE ARCHER MYERS TP ARCHER PINEBLUF ARCHER SKYLINE ARCHER CROWCRK ARCHER AULT ARCHER STEGALL ARCHER NORTH PA ARCHER HAYDEN AULT CHEYENNE AULT LAR.RIVR BASIN WORLANTP BASIN NAHNEJEN BGEORGE GLENDLTP BGEORGE LOVELL BGEORGE MEETSETP BOYSEN COPPERMT BOYSEN THERMOPL BOYSEN HARRSBRG BUFFBILL HEART MT BUFFBILL N. CODY

24 73032 BUFFBILL BUFFBLPP BUSHNLTP PINEBLUF CARTERMT CMTDUM CARTERMT THERMOPL CARTERMT MEETSETP CASPERLM DAVEJTPN CHEYENNE HAPPYJCK CHEYENNE CROWCRK CHEYENNE PONNEQUI CHEYENNE SNOWYRNG COPPERMT RADERVIL GARLAND LOVELL GARLAND POWELLTP GEMCTYTP HAPPYJCK GEMCTYTP SPRINGCK GEMCTYTP SNOWYRNG GLENDLTP HEART MT GLENDO GUERNTAP GLENDO PODOLAK GLENDO WHTROCK GLENDO WAGHN NT GLENDO WAGHN ST DAVEJTPN WAGHN NT DAVEJTPS REFNRYTP DAVEJTPS WAGHN ST GUERNTAP LIMESTON GUERNTAP GUERNRRL GUERNTAP WHTROCK HAPPYJCK CORLETT HDOME JIMRDYTP HEART MT N. CODY JIMREADY JIMRDYTP KORTES KORTESTP KORTES MIRACLEM KORTESTP MIRACLEM KORTESTP SEMINOE LAGRANGE ROUNDTOP LAGRANGE STEGALL LAR.RIVR STEGALL LAR.RIVR STORY LARAMIE OASISTAP LARAMIE SNOWYRNG LINGLE LINGLETP LOVELL NAHNEJEN LYMAN TORRNGTN LYMAN LYMANTP

25 73128 MAY OASISTAP MED BOW MEDBOWTP MIRACLEM SEMINOTP MIRACLEM MEDBOWTP MYERS MYERS TP MYERS TP POLE CK N. CODY RALSTON OASISTAP MEDBOWTP PILOT BU WINDRIVT PILOT BU HARRSBRG POLE CK QUALLS POLE CK ROUNDTOP POWELLTP RALSTON RADERVIL ERVAYBAS RIVERTON WINDRIVT ROUNDTOP SENTINEL SEMINOE SEMINOTP SKYLINE WARRENLM SPRINGCK FTSANDER STEGALL LINGLETP STEGALL LYMANTP TCAPS THERMOPL TCAPS JIMRDYTP THERMOPL WORLANTP WINDRIVR WINDRIVT LINGLETP WHTROCK LYMANTP WHTROCK TEKLA PUMPKIN BBILL SHOSHONE DUTONBAS ERVAYBAS GARCANPP RALSTON CORLETT WARRENLM JACKLOPE WARMSPGS MEDBOWHS MEDBOWTP WARMSPGS EMI TAP WAGNHNDS WAGHN NT WAGNHNDS WAGHN ST WAGNHNDS EMI TAP BBILL SPIRTMTN BUFBASIN CMTDUM HDOME CMTDUM CHEYENNE SNOWYRNG SNOWYRNG MIRACLEM WHEATLND LAR.RIVR EMIGRNT EMI TAP DONKYCRK PUMPKIN

26 76400 PUMPKIN BARBERCK Two Winding Transformers BRIDGER BRIDGER BRIDGER BRIDGER BRIDGER BRIDGER ANT MINE ANT MINE BADWATER B-'SIDE' B BADWATER A&C-'SIDE' A BADWATER A&C-'SIDE' C BAIROIL BAIROIL BAIROIL BAIROIL BAIROIL BAIROIL BAR-X BAR-X BRIDGER BRIDGER BUFFALO BUFFALO CASPERPP CASPERPP CASPERPP CASPERPP CASPERPP CASPERPP CASPERPP CASPERPP CENTERST CENTERST BRYAN BRYAN REFNRY REFNRYPP REFNRY REFNRYPP ELKHORN ELKHORN DAVEJOHN DAVEJOHN DAVEJOHN DAVEJON DAVEJOHN DAVEJON DAVEJOHN DAVEJOHN DAVEJOHN DAVEJON DAVEJOHN DAVEJON FIREHOLE FIREHOL FIREHOLE FIREHOL FT CREEK FT CRK FT CREEK FT CRK GREATDIV GREATDIV MIDWEST MIDWEST MIDWEST MIDWEST MINERS MINERS MINERS MINERS MINERS MINERS MUSTANG MUSTANG MUSTANG MUSTANG MUDYCRK MTNWD MUDYCRK MTNWD

27 66240 PLATTE PLATTE PLATTE PLATTE PLATTE PLATTE PT ROCKS PT ROCKS RIVERTON RIVERTON RIVERTON RIVERTON RIVERTON RIVERTON ROCKSPGS ROCKSPGS ROCKSPGS ROCKSPGS SHERIDAN SHERIDAN SHERIDAN SHERIDAN THERMOPL THERPACE THERMOPL THERPACE WYODAK WYODAK WYODAK WYODAK WYODAK WYODAK WYODAK WYGEN WYOPO WYOPO YELLOWCK YELLOWCK COL GEN COL GEN COL GEN COL GEN HILLTOP HILLTP HILLTOP HILLTP LATHAM LATHAM FREEZOUT MIHILL GLENROCK GLENRK GLENROCK GLENRK GLENRK GLENRKG GLENRKG GLENRK MTNWD MTNWD G MTNWD MTNWD G MTNWD MTNWD G MTNWD MTNWD G MIHILL MIHL G HIPLANE HIPLN_CL HIPLN_SL HIPLN_G THREEB THREB_CL THREB_SL THREB_G CASPW LS CASPW G ALCOVA ALCOVA ALCOVA ALCOVA ARCHER ARCHER ARCHER ARCHER BGEORGE BGEORGE BOYSEN BOYSEN CARTERMT CARTERMT

28 73043 CHEYENNE CHEYENNE FREMONT FREMONT FREMONT FREMONT GLENDO GLENDO GLENDO GLENDO GREYBULL NAHNEJEN HDOME HDOME HEART MT HEART MT KORTES KORTES KORTES KORTES KORTES KORTES LAR.RIVR LAR.RIVR LAR.RIVR LAR.RIVR LAR.RIVR MBPP LAR.RIVR MBPP LOVELL LOVELL PILOT BU PILOT BU PILOT BU PILOT BU RALSTON RALSTON SEMINOE SMNOE SEMINOE SEMINOE BBILL BUFFBLPP GARCANPP GARCANPP PILOT BU PILOT BU PILOT BU PILOT BU GUERNSY LIMESTON LIMESTON LIMESTON LIMESTON GUERNSY BUFFBLPP BBILL WHTROCK WHTROCK BARBERC BARBERCK BARBERC BARBERCK BARBERC BARBERCK HARTZOG PUMPKIN HARTZOG PUMPKIN HARTZOG PUMPKIN Three Winding Transformers CASPERWD CASPERWD CASPW TR SNOWYRNG SNOWYRNG SNG_LV SNOWYRNG SNOWYRNG SNG_LV

29 73572 MIRACLEM MIRACLEM MM_LV MIRACLEM MIRACLEM MM_LV