Transcript Transmission Template

Entergy Gulf States, Inc.
(Texas)
Approved & Proposed
Transmission Reliability Projects
Entergy/ETEC Subcommittee Meeting
The Woodlands, TX
November 28, 2006
1
Recap of 2004-06 EGSI-TX Transmission
Western Region Reliability Improvement Plan: Phase II
Scenario:
• In 2003, several planning studies indicated the Western Region has the potential to
encounter voltage stability problems and thermal overloading under the double
contingencies listed below.
o
o
o
Loss of Lewis Creek Unit & 345 kV Line 119 (Crockett-Grimes)
Loss of Lewis Creek Unit & 230 kV Line 568 (China-Jacinto)
Loss of both Lewis Creek Units
Recommended Solution:
• Phase II of the Western Region Reliability Improvement Plan addresses the projected
load growth with the following projects:
o
o
o
o
o
o
500/230 kV Auto (Cypress)
Construct Line 822 (China-Porter) 230 kV
Construct 230/138 kV Porter Substation
Upgrade Line 599 (Amelia-China) 230 kV
Install 300 MVAr SVC at Porter Substation
Install series compensation on Line 822 (China-Porter)
Estimated Cost: $115 MM
2
COMPLETED
COMPLETED
COMPLETED
COMPLETED
COMPLETED
COMPLETED
2006 EGSI-TX Approved Transmission Reliability Projects
Western Region Phase II
INSTALLED
SERIES
CAPACITOR
ON LINE 822
INSTALLED
300 MVAr SVC
3
Approved 2007 EGSI-TX
Transmission Reliability Projects in
Entergy’s Construction Plan
In
Service
Year
Estimated
Cost
($MM)
Grimes: Reconfigure Substation
2007
$0.5
Approved
Kolbs & Hanks: 230 kV Bus Upgrades
2007
$0.2
Approved
Splendora Switch Clearance/Replacement
(Mandatory – Safety)
2007
$0.08
Approved
2007 - 2008
$1.3
Approved
Calvert: Expand cap bank to 12 MVAr
2008
$0.6
Approved
Sandy Shores: Install 11 MVAr cap bank
2008
$0.5
Scoping Only
Porter-Tamina-Conroe Upgrade 138 kV lines
2008
$5.5
Approved
Beaumont 69 kV Improvement Plan
2009
$8
Approved
$2
Scoping &
Engineering Only
Project Name
EGSI-TX Underrated Breaker Upgrades (12- 69
kV breakers, Mandatory – Safety)
Western Region Reliability Improvement Plan:
Phase 3
2010
4
Comments
Approved EGSI-TX Transmission Reliability Projects in
Entergy’s Construction Plan
Calvert: Expand 69 kV
Cap Bank
Others:
• WRRIP- Phase 3
Scoping &
Engineering
• Upgrades of
underrated breakers
(various locations,
mandatory-safety)
• Splendora: Replace
switch (mandatorysafety)
Grimes: Reconfigure
345/138 kV Substation
Calvert
Grimes
Conroe
Porter
Tamina
Helbig
Amelia
Porter-Tamina-Conroe:
Upgrade 138kV Lines
South
Beaumont
Beaumont 69 kV System
Improvement Plan
5
Sandy
Shores
Hanks
Kolbs
Kolbs & Hanks:
Upgrade 230 kV Bus
Sandy Shores:
Add 69 kV Cap Bank
Grimes 345/138 kV Substation
Reconfiguration
Scenario:
• 345/138 kV autotransformers tied to same node of 345 kV and 138 kV ring
busses.
• Single contingency loss of either 345/138 kV autotransformer causes the
loss of the parallel autotransformer.
Recommended Solution:
• Install a 345 kV circuit breaker to separate autotransformers on 345kV
ring and reconfigure station to alternate lines and loads.
• Install 138 kV breaker to separate autotransformers on 138 kV ring.
Estimated Cost: $0.5 MM (2007 cost only)
6
2007
CROCKETT
Grimes 345/138 kV Substation Reconfiguration
RECONFIGURE
345 kV BUS
345kV
AUTO #1
138kV
AUTO #2
INSTALL 138 kV
BREAKER
7
FRONTIER
INSTALL 345 kV
BREAKER
Hanks & Kolbs: Upgrade Substation Bus
Scenario:
• Firm load within the Port Arthur area has grown such that the Hanks and
Kolbs substation through bus overloads under the loss of the Sabine to
Mid County 230 kV line.
Recommended Solution:
• Upgrade limiting elements of substation bus at Hanks & Kolbs.
Estimated Cost: $0.2 MM
8
Hanks & Kolbs: Upgrade Substation Bus
Kolbs
Hanks
9
EGSI-TX Circuit Breaker Upgrades
Scenario:
• Based on asymmetrical fault current analysis, various circuit breakers have been
identified as underrated.
Recommended Solution:
• Replace the identified underrated circuit breakers with appropriately sized breakers.
–
–
–
2006
o Cow 69kV #5515, #5510
o Orange 69kV #3165, 3145
2007
o Orange 69kV #3365
o South Beaumont 69kV #3700
o Port Neches 138kV #3345
o West End 69kV #22135
2008
o Orange 69kV #3370
o Dupont Bulk 69kV #3255, #3260
o Helbig 69kV #5585
10
EGSI-TX 69 kV System Voltage Support
Calvert 69 kV Substation
• Loss of 69 kV Line 159 (Bryan – APL Hearne) causes under-voltages at Calvert
69 kV Substation.
• Expand existing capacitor bank to 12 MVAr
• Approximate Cost: $0.6 MM
Sandy Shores 69kV Substation
• Multiple contingencies cause under-voltages on 69 kV Line 175 “Beach Line.”
• Install 11 MVAr capacitor bank
Estimated Cost: $0.5 MM
11
2007
EGSI-TX 69 kV Voltage Support
EXPAND
EXISTING
CAP BANK
INSTALL
11MVAR
CAP BANK
12
Porter-Tamina-Conroe:
Upgrade 138 kV Lines 823 & 886
Scenario:
• Lines 823 & 886 are 138 kV tie lines to the Western Region and the Conroe
area specifically.
• The loss of 138 kV Line 886 (Oak Ridge – Porter) overloads Lines 823 & 886
above their thermal limits.
Recommended Solution:
• Upgrade Line 886 (Tamina – Conroe) to 531 MVA capacity; replace switches
and breaker at Tamina Substation to increase rating on the Porter-Tamina line
segment.
Estimated Cost: $5.5 MM
13
Porter-Tamina-Conroe:
Upgrade 138 kV Lines 823 & 886
UPGRADE TO
531MVA
CAPACITY
14
2007
69 kV Beaumont Network Upgrades
Scenario:
• In the 69 kV Beaumont area there exists several single contingency thermal
overloads including:
o
o
o
o
69 kV Line 581 (Helbig – Rosedale)
69 kV Line 468 (Elizabeth – Gallier)
230/69 kV Helbig Autotransformers
69 kV Bus Tie Breakers (Helbig & Amelia)
Recommended Solution:
• Add line breakers at Yankee Doodle 69 kV Substation.
• Close normally open points at Lincoln and Crockett 69 kV Substations.
• Rebuild 69 kV Line 576 (Lincoln – South Beaumont) & 69 kV Line 98/190
(Dupont Beaumont – South Beaumont) to 106 MVA capacity.
o Approximately 5.5 miles of 69 kV transmission lines
Estimated Cost: $8 MM
15
2007
69 kV Beaumont Network Upgrades
CROCKETT
YANKEE
DOODLE
CLOSE N.O.
SWITCH
L-155
CLOSE N.O.
BREAKER
VIRGINIA
LINCOLN
L-458
CARDINAL
ADD LINE
BREAKERS
UPGRADE
LINE 576
L-458
LAMAR
CDT
NITRO
UPGRADE
LINE 190
DUPONT BEAUMONT
SOUTH BEAUMONT
BULK
UPGRADE
LINE 98
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2010+
Western Region Reliability Improvement Plan:
Phase III and IV
Western Region Reliability Improvement Plan (Phases 3 & 4)*
• Potentially convert 138 kV Lines 524/824 (Jacinto-Lewis Creek) to 230 kV
operation.
• Construct a 230 kV transmission line from Cypress to Jacinto.
• Construct a 230 kV transmission line from Porter to Lewis Creek.
• Install static and dynamic VAR support in the Western Region.
* Note: This set of projects may be modified based on further
activities and developments occurring at the Louisiana and Texas
Commissions.
17
Alternatives to the Western Region
Reliability Improvement Plan
• Projects identified in Phases 3 and 4 of the WRRIP results in greater
reliance on and strengthening of the transmission corridor between
the Western Region and the Beaumont area.
• Because of recent events such as the isolation of the Western Region
from the rest of the Entergy System, the Company has developed
several alternatives to the projects described above. These
alternatives would strengthen the Western Region’s ties to the west.
18
WRRIP Alternative 1
• Enhancement of the reliability at Grimes Substation in order to reduce
the reliance from the Beaumont area
• Upgrades of 138 kV Lines 112 and 485 to sufficient capacity
• Installation of a 345 kV bulk tie between Grimes and Lewis Creek
• This option also requires additional firm local generation.
19
WRRIP Alternative 2
• Enhancement of the reliability of the 345 kV tie to AEP-West in order
to reduce reliance from the Beaumont area.
• Upgrade of 138 kV Line 485 to sufficient capacity
• Installation of a 345 kV switchyard on Line 119 including a 345 kV tie
line to Rivtrin Substation
• This option also requires additional firm local generation.
20
ALT #2
Construct 345 kV
Network Into
Rivtrin
Enhance 138kV
and 345kV
Network at
Grimes and
Lewis Creek
Construct/
Enhance 230 kV
Network Into
Lewis Creek
Current Plan:
Phases 3 & 4
ALT # 1
21
Approved 2007 ETEC-Related
Transmission Reliability Projects in
Entergy’s Construction Plan
In
Service
Year
Estimated
Cost ($MM)
JNEC Deweyville - Add breakers & cut-in Line
2007
$0.4
Approved
SHECO - Menard Substation Upgrades
2007
$0.1
Approved
SHECO - Turkey Creek Substation Upgrades
2007
$0.1
Approved
Project Name
22
Comments
Longer-Term Reliability Target Areas (2011+)
Potential thermal overloads under single contingency conditions:
•
230 kV Line 496 (China – Sabine)
–
•
•
–
For the loss of 138kV sources from
either the Lewis Creek or Grimes end
[Could be addressed by the Longmire
reconfiguration project]
For the loss of Line 590 (Gulfrich –
Ausimont)
For the loss of Line 886 (Tamina – Porter)
138 kV Line 86 (Dayton – Eastgate)
–
•
138 kV Lines from between Lewis
Creek and Dobbin
–
For the loss of Line 579 (Jacinto –
Cleveland)
For the loss of the Hartburg-Cypress
500 kV line
138 kV Line 582 (Oak Ridge – Porter)
–
•
•
For the loss of Line 822 (China – Porter)
For the loss of Line 515 (Sabine –
Port Neches)
138 kV overloads in the JasperNewton area
–
138 kV Line 561 (Gulfrich – Crown Orange)
–
•
•
For the loss of Line 496 (China – Sabine)
138 kV Line 150 (Dayton – Long John)
–
•
For the loss of the Hartburg-Cypress 500 kV
line
138 kV Line 571 (Jacinto – Porter)
–
138 kV Line 516 (Sabine – Port
Neches)
–
138 kV Line 88 (Dayton – Cheek)
–
•
For the loss of Line 599 (China – Amelia)
230 kV Line 194 (Hartburg-Helbig)
–
•
•
– Depressed voltages in the
For the loss of Line 882 (China – Porter)
Lacon Substation area
– WRRIP Phase 4
138 kV Line 515 (Sabine – Port Neches)
–
• Other target areas/ projects:
For the loss of Line 516 (Sabine – Port
Neches)
23