1. Team Members: Kyle Jones Mark Magee Jason Rippee
Borah Mitigators Remedial Action Scheme for the Borah West Path Sponsored by: IDAHO POWER
Team Members:
Kyle Jones
Mark Magee
Jason Rippee

2. Project Background
Idaho Power wants to add to a remedial action scheme for the Borah West Path
To include the impact of ambient temperature changes to the system
Maximize the power flow utilizing thermal capability

3. Deliverables Simulation of the modified scheme in PowerWorld 11
Provide a set of mitigation options to increase transfer capability

4. Needs Analysis
Due to the growth of Boise, the load flow is increasing along the path
The Borah West Path has elements that reach their thermal limit following the loss of critical transmission lines
Compensating for thermal effects will increase the load carrying capacity in lines

5. Cost Analysis Investments/Costs Hours Total Dollars per Week Weeks
per Hour
Item Cost
Student Time 15 26
390
$50.00
$19,500.00
Faculty Time 2 52
$150.00
$7,800.00
Laboratory Facility 10 4 40
$25.00
$1,000.00
PowerWorld Simulator
$12,000.00
IEEE
$143.35
Poster Board
$14.69
Poster Photo
$45.00
Projected Total Cost:
$40,503.04

6. Insights to the Problem
The first slide demonstrates the current limit conditions
The second slide gives a flow chart of what remedial action is to be taken
The third slide is a graphical depiction of the flow chart

7. Midpoint East flow, MW (pre-disturbance)
Calculated Borah West limits
Midpoint East flow, MW (pre-disturbance)
( Summer time )
W/ 1 unit trip = A =
*degC * 1st unit MW
where Ta = actual ambient temperature in deg C
1st Bridger Unit to trip (MW)
W/ 1 unit trip &bypass both series caps = Ac =
*degC * 1st unit MW * Midpoint East flow (MW)
2nd Bridger Unit to trip (MW)
W/ 1 unit trip &bypass 1 series cap = AC/2 = A + (Ac-A)/2
W/ 2 unit trips = B =1929 – 6.64*degC * (1st + 2nd unit MW)
W/ 2 unit trip & bypass both series caps = Bc =
1293 – 3.93*degC * (1st + 2nd unit MW) *Midpoint East flow (MW)
W/ 2 unit trip &bypass 1 series cap = BC/2 =
B + (Bc-B)/2

8. Is Midpoint East scheme will trip 1 Bridger Unit Bypass Burns
Series Capacitor
Critical Outage has occurred:
Kinport – Midpoint and Borah – Adelaide – Midpoint #1 or #2 345kV lines Is
AC/ 2 > A ?
Is BW > ~1100MW Is
BW > A
yes
yes
yes no no no Is
BW > A
yes
No action taken
X33
No action taken
No action taken no
No action taken
Trip 2nd
Bridger
Bypass Midpoint
Series Capacitor
Initiate Bridger Redispatch
or / and load curtailment
to eliminate overloads on remaining Borah – Adelaide – Midpoint 345kV line and AMFLS – Adelaide and AMFLS – Plst Valley 138kV lines
X33 Is
BW > AC/ 2 Is
BW > AC Is
BW > BC
yes
yes
yes no no no
No action taken
No action taken
No action taken

10. Constraints
Keep voltage deviation after one line loss below 5% of nominal operating voltage, and below 10% for a two line loss.
Under normal conditions conductor temperatures should not exceed 80 degrees Celsius.
Outage conditions should not exceed 90 degrees Celsius for more than 15 minutes.

11. Constraints 2 In order of importance:
1) Avoid tripping Generators at all costs! ( lots of money)
2) Avoid dropping loads.
3) Avoid shorting series capacitors (not that big of deal).
Utilize thermal capabilities if possible.

12. Schedule

13. Fall Schedule

14. Project Learning IEEE standard publication 738-1993 PowerWorld Manual
ETAP Software
Series Capacitors
Load Shedding
Generator Dropping

15. اIا2*Rac+qs=qc+qr اIا, is the magnitude of maximum current (ampacity)
Rac, is the ac resistance of the conductor
qs, is the head absorbed by the sun
qr, is the radiated heat of the conductor
qc, is the convected heat of the conductor

16. Questions?

17. Our Questions Are violations outside of Idaho our concern?
What are the required deliverables and what are optional?
For thermal modeling do we use limit groups or can we scale all ampacities by a factor?
How do we approach weather conditions?
Do you want to increase transfer levels from the base case?
Do we need the ATC PowerWorld add-on?

18. Limit Group Factors