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1 Local Area Planning Update to TRANSAC – 1 Local Area Planning Update to TRANSAC –

1 Local Area Planning Update to TRANSAC – - PowerPoint Presentation

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1 Local Area Planning Update to TRANSAC – - PPT Presentation

December 21 2016 2 Status Update Base cases representing the peak scenarios over the 5 10 and 15 year planning horizon have been completed along with System Normal and Contingency case powerflow ID: 552180

planning year cases 100 year planning 100 cases horizon voltage overloads results analysis minor future loss 2031 2021 230

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Slide1

1

Local Area Planning Update to TRANSAC –

December 21, 2016Slide2

2

Status Update

Base cases representing the peak scenarios over the 5, 10, and 15 year planning horizon have been completed, along with System Normal and Contingency case

powerflow simulations.Problems identified and reported in the “State-of-the-System” study are not mentioned in this presentation, if they continue to exist.

Analysis of Future CasesSlide3

3

Substation Projects included in 2021-2031 base cases:

Crooked Falls Expansion/Rainbow removal

Alkali Creek Sub upgrade (tie in adjacent line)Rimrock Sub rebuild (Major rebuild, 2 230/100 kV auto transformers)East Gallatin Sub rebuild (bus reconfiguration)Big Timber Auto upgrade (new line breakers, transformer)Livingston Sub rebuild (combine subs, added capacitors)

Belgrade West Sub (new sub, 161/50 kV auto transformer)

Analysis of Future CasesSlide4

4

Substation Projects included in 2021-2031 base cases:

York Switchyard (new sub, added line breakers)

Custer Auto (new sub, 100/69 kV auto transformer)East Helena (minor bus reconfiguration)Great Falls 230 Switchyard (minor bus reconfiguration)Kershaw Switchyard (new sub, added line breakers, capacitor)Rattlesnake Switchyard (100 kV bus tie breaker added)

Stevensville Capacitor

Analysis of Future CasesSlide5

5

Substation Projects included in 2021-2031 base cases:

Line breakers added to the following substations:

Sheridan Auto 161 kV breakersKing Ave 100 kV breakersWicks Lane 230 kV breakersMissoula #5 100 kV BreakersTarget Range 161 kV Breakers (installed 2016)

Analysis of Future CasesSlide6

6

Transmission Projects included in 2021-2031 base cases:

Anaconda – Drummond 100 kV upgrade from 50 kV

GF 230 Swyd – Riverview – GF Northwest 100 kV conductor upgradeBaseline – Meridian 100 kV conductor upgradeRapelje – Nye 100 kV line (new)Broadview – Billings 230 kV line (new)Big Timber Auto – Melville 50 kV conductor upgrade

Livingston – Emigrant 69 kV conductor upgrade

Holter

– Helena Valley 100 kV conductor upgrade

Helena Valley 100 kV Loop (new)

Analysis of Future CasesSlide7

7

Customer Forecast Projects in 2021-2031 base cases:

Great Falls Eastside rebuild

New Cenex 100 kV substationCenex Lines – conductor upgradeJackrabbit 161 kV distribution transformer

Lone Mountain 161 kV distribution transformer

Includes 69 kV to 161 kV Ennis – Lone Mountain cutover

New Big Sky area 69 kV substation

New Helena Valley area 100 kV substation

Colstrip Units 1 & 2 Shutdown

Analysis of Future CasesSlide8

8

Summary Results 2021 – 2031 Cases: Thermal Issues

(P0)

No thermal overloads were observed under normal system conditions.(P12) GF Southeast – GF Northeast 100 kV overloads, automatic tripping results in cascading overloads & loss of multiple Great Falls substations. (15-year Planning Horizon)

(P12/P13/P23) Steamplant 230/100 kV autos overload in 5-year planning horizon, Rimrock Project mitigates.

(P12/P23) Steamplant – Laurel 100 kV or Baseline – Laurel 100 kV overloads, automatic tripping results in loss of Laurel substations. (15-year Planning Horizon, due to customer forecasted growth)

(P12/P13/P22) Rimrock – Eastside 100 kV overloads, automatic tripping does not result in cascading overloads. No loss of load. (10-year planning horizon, shift in 100 kV flow from Rimrock Project)

Analysis of Future CasesSlide9

9

Summary Results 2021 – 2031 Cases: Thermal Issues

(P12/P23) York Swyd – East Helena Swyd 100 kV “A” or “B” overload, automatic tripping results

in cascading overloads & loss of multiple Helena substations. (5-year planning horizon, Custer Auto project mitigates)(P12) Hamilton City – Hamilton Southside 69 kV overloads, automatic tripping results in loss of Hamilton and Darby substations. Radial configuration, mitigation plan developed. (15-year planning horizon)(P13/P23) Hamilton Heights – Corvallis 69 kV overloads, automatic tripping results in cascading overloads & loss of multiple Bitterroot area substations. (5-year planning horizon)

(P24) Rattlesnake Swyd – Reserve St 161 kV overloads due to current limiting device. (15-year planning horizon)

Analysis of Future CasesSlide10

10

Summary Results 2021 – 2031 Cases: Thermal Issues

(P24) Reserve St – Missoula #1 100 kV overloads, automatic tripping results in further overloads. No loss of load. (10-year planning horizon

)(P23) Hamilton Heights 161/69 kV ‘B’ transformer, automatic tripping results in loss of all Bitterroot area 69 kV substations. (5-year planning horizon, load loss allowed by TPL standard).(E2B) Hardin Auto – Crossover 230 kV overloads in 5-year planning horizon,

New Broadview – Billings 230 kV line mitigates

.

(E2B) GF City – MT Refining 100 kV overloads, automatic tripping results in cascading overloads & loss of multiple Great Falls substations. (

10-year

Planning Horizon

)

(E2B) Missoula #4 – Stevensville 69 kV ‘A’ & ‘B’ lines, automatic tripping results

loss of all Bitterroot 69 kV substations.

(load

loss allowed by TPL standard).

Analysis of Future CasesSlide11

11

Summary Results 2021 – 2031 Cases: Voltage Issues

(P0) Roundup - Musselshell 50 kV line, minor low voltage in 5-year planning horizon and declining into major low voltage in the 10-year and 15-year planning horizons.

(P0) Sheridan – Dillon 69 kV line, minor low voltage starting in the 15-year planning horizons. (P1) All voltage deviation violations also resulted in low voltage violations.(P12) Bozeman Division 161 kV system, minor low voltage starting in the 15-year planning horizon.

(P12/P13) Laurel Area – 100 kV & 50 kV, minor low voltage starting in the 10-year planning horizon.

Analysis of Future CasesSlide12

12

Summary Results 2021 – 2031 Cases: Voltage Issues

(P13/P22) Lewistown District, major low voltage spread across 50 kV system and

declining (minor low voltage now). Minor low voltage on 100 kV system (5-year planning horizon).(P13/P22/P23) Roundup area 100 kV, moderage

low voltage in the 5-year planning horizon and declining into major low voltage in the 10-year and 15-year planning horizons.

(P13) Stevensville 69

kV area,

minor low voltage in

the 5-year

planning horizon and declining into major low voltage in the 10-year and 15-year planning horizons.

(P13) Havre City 69 kV system

, minor low voltage in 5-year planning horizon and declining into

moderate

low voltage in the 10-year and 15-year planning horizons

.

Analysis of Future CasesSlide13

13

Summary Results 2021 – 2031 Cases: Voltage Issues

(

P22) Garrison (BPA) 230 kV Bus Fault causes widespread minor to moderate low voltage across multiple divisions in the 10-year planning horizon and declining into major low voltage in the 15-year planning horizon.(P22) Big Timber 50 kV area, minor low voltage in the 10-year planning horizon.

(E2B) Greater Billings 230 kV, 161 kV, 100 kV, 50 kV system, minor

low voltage in 5-year planning horizon, New Broadview – Billings 230 kV line mitigates.

Analysis of Future CasesSlide14

Pending Analysis to be Completed:P3 and P6 events (N-1-1) power-flow simulations are near completion.

Massive data set to analyze.

Corrective action allowed between element outages.

Stability (Dynamic) simulations have be started and will be completed soon.No major problems are anticipated. Analysis of Future Cases

14Slide15

Next Steps

Verify New Problems Found.

Prioritize Problems using Decision Rules.

Begin or Continue Mitigation Studies.Next Steps

15Slide16

Questions?

16Slide17

17